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The cereals imperative of future food systems

Written by Rodrigo Ordóñez on . Posted in Features. 1 Comment on The cereals imperative of future food systems

Pioneering research on our three most important cereal grains — maize, rice, and wheat — has contributed enormously to global food security over the last half century, chiefly by boosting the yields of these crops and by making them more resilient in the face of drought, flood, pests and diseases. But with more than 800 million people still living in chronic hunger and many more suffering from inadequate diets, much remains to be done. The challenges are complicated by climate change, rampant degradation of the ecosystems that sustain food production, rapid population growth and unequal access to resources that are vital for improved livelihoods.

In recent years, a consensus has emerged among agricultural researchers and development experts around the need to transform global food systems, so they can provide healthy diets while drastically reducing negative environmental impacts. Certainly, this is a central aim of CGIAR — the world’s largest global agricultural research network — which views enhanced nutrition and sustainability as essential for achieving the Sustainable Development Goals. CGIAR scientists and their many partners contribute by developing technological and social innovations for the world’s key crop production systems, with a sharp focus on reducing hunger and poverty in low- and middle-income countries of Africa, Asia and Latin America.

The importance of transforming food systems is also the message of the influential EAT-Lancet Commission report, launched in early 2019. Based on the views of 37 leading experts from diverse research disciplines, the report defines specific actions to achieve a “planetary health diet,” which enhances human nutrition and keeps the resource use of food systems within planetary boundaries. While including all food groups — grains, roots and tubers, pulses, vegetables, fruits, tree nuts, meat, fish, and dairy products — this diet reflects important shifts in their consumption. The major cereals, for example, would supply about one-third of the required calories but with increased emphasis on whole grains to curb the negative health effects of cheap and abundant supplies of refined cereals.

This proportion of calories corresponds roughly to the proportion of its funding that CGIAR currently invests in the major cereals. These crops are already vital in diets, cultures, and economies across the developing world, and the way they are produced, processed and consumed must be a central focus of global efforts to transform food systems. There are four main reasons for this imperative.

Aneli ZĂĄrate VĂĄsquez (left), in Mexico's state of Oaxaca, sells maize tortillas for a living. (Photo: P. Lowe/CIMMYT)
Aneli ZĂĄrate VĂĄsquez (left), in Mexico’s state of Oaxaca, sells maize tortillas for a living. (Photo: P. Lowe/CIMMYT)

1. Scale and economic importance

The sheer extent of major cereal production and its enormous value, especially for the poor, account in large part for the critical importance of these crops in global food systems. According to 2017 figures, maize is grown on 197 million hectares and rice on more than 167 million hectares, mainly in Asia and Africa. Wheat covers 218 million hectares, an area larger than France, Germany, Italy, Spain and the UK combined. The total annual harvest of these crops amounts to about 2.5 billion tons of grain.

Worldwide production had an estimated annual value averaging more than $500 billion in 2014-2016. The prices of the major cereals are especially important for poor consumers. In recent years, the rising cost of bread in North Africa and tortillas in Mexico, as well as the rice price crisis in Southeast Asia, imposed great hardship on urban populations in particular, triggering major demonstrations and social unrest. To avoid such troubles by reducing dependence on cereal imports, many countries in Africa, Asia and Latin America have made staple crop self-sufficiency a central element of national agriculture policy.

Women make roti, an unleavened flatbread made with wheat flour and eaten as a staple food, at their home in the Dinajpur district, Bangladesh. (Photo: S. Mojumder/Drik/CIMMYT)
Women make roti, an unleavened flatbread made with wheat flour and eaten as a staple food, at their home in the Dinajpur district, Bangladesh. (Photo: S. Mojumder/Drik/CIMMYT)

2. Critical role in human diets

Cereals have a significant role to play in food system transformation because of their vital importance in human diets. In developing countries, maize, rice, and wheat together provide 48% of the total calories and 42% of the total protein. In every developing region except Latin America, cereals provide people with more protein than meat, fish, milk and eggs combined, making them an important protein source for over half the world’s population.

Yellow maize, a key source of livestock feed, also contributes indirectly to more protein-rich diets, as does animal fodder derived from cereal crop residues. As consumption of meat, fish and dairy products continues to expand in the developing world, demand for cereals for food and feed must rise, increasing the pressure to optimize cereal production.

In addition to supplying starch and protein, the cereals serve as a rich source of dietary fiber and nutrients. CGIAR research has documented the important contribution of wheat to healthy diets, linking the crop to reduced risk of type 2 diabetes, cardiovascular disease, and colorectal cancer. The nutritional value of brown rice compared to white rice is also well known. Moreover, the recent discovery of certain genetic traits in milled rice has created the opportunity to breed varieties that show a low glycemic index without compromising grain quality.

Golden Rice grain (left) compared to white rice grain. Golden Rice is unique because it contains beta carotene, giving it a golden color. (Photo: IRRI)
Golden Rice grain (left) compared to white rice grain. Golden Rice is unique because it contains beta carotene, giving it a golden color. (Photo: IRRI)

3. Encouraging progress toward better nutritional quality

The major cereals have undergone further improvement in nutritional quality during recent years through a crop breeding approach called “biofortification,” which boosts the content of essential vitamins or micronutrients. Dietary deficiencies of this kind harm children’s physical and cognitive development, and leave them more vulnerable to disease. Sometimes called “hidden hunger,” this condition is believed to cause about one-third of the 3.1 million annual child deaths attributed to malnutrition. Diverse diets are the preferred remedy, but the world’s poorest consumers often cannot afford more nutritious foods. The problem is especially acute for women and adolescent girls, who have unequal access to food, healthcare and resources.

It will take many years of focused effort before diverse diets become a reality in the lives of the people who need them most. Diversified farming systems such as rice-fish rotations that improve nutritional value, livelihoods and resilience are a step in that direction. In the meantime, “biofortified” cereal and other crop varieties developed by CGIAR help address hidden hunger by providing higher levels of zinc, iron and provitamin A carotenoids as well as better protein quality. Farmers in many developing countries are already growing these varieties.

A 2018 study in India found that young children who ate zinc-biofortified wheat in flatbread or porridge became ill less frequently. Other studies have shown that consumption of provitamin A maize improves the body’s total stores of this vitamin as effectively as vitamin supplementation. Biofortified crop varieties are not a substitute for food fortification (adding micronutrients and vitamins during industrial food processing). But these varieties can offer an immediate solution to hidden hunger for the many subsistence farmers and other rural consumers who depend on locally produced foods and lack access to fortified products.

Ruth Andrea (left) and Maliamu Joni harvest cobs of drought-tolerant maize in Idakumbi, Mbeya, Tanzania. (Photo: Peter Lowe/CIMMYT)
Ruth Andrea (left) and Maliamu Joni harvest cobs of drought-tolerant maize in Idakumbi, Mbeya, Tanzania. (Photo: Peter Lowe/CIMMYT)

4. Wide scope for more sustainable production

Cereal crops show much potential not only for enhancing human heath but that of the environment as well. Compared to other crops, the production of cereals has relatively low environmental impact, as noted in the EAT-Lancet report. Still, it is both necessary and feasible to further enhance the sustainability of cereal cropping systems. Many new practices have a proven ability to conserve water as well as soil and land, and to use purchased inputs (pesticides and fertilizers) far more efficiently. With innovations already available, the amount of water used in current rice cultivation techniques, for example, can be significantly reduced from its present high level.

Irrigation scheduling, laser land leveling, drip irrigation, conservation tillage, precision nitrogen fertilization, and cereal varieties tolerant to drought, flooding and heat are among the most promising options. In northwest India, scientists recently determined that optimal practices can reduce water use by 40%, while maintaining yields in rice-wheat rotations. There and in many other places, the adoption of new practices to improve cereal production in the wet season not only leads to more efficient resource use but also creates opportunities to diversify crop production in the dry season. Improvements to increase cereal crop yields also reduces their environmental footprint; using less land, enhancing carbon sequestration and biodiversity and, for rice, reducing methane emissions per kilo of rice produced. Given the enormous extent of cereals cultivation, any improvement in resource use efficiency will have major impact, while also freeing up vast amounts of land for other crops or natural vegetation.

A major challenge now is to improve access to the knowledge and inputs that will enable millions of farmers to adopt new techniques, making it possible both to diversify production and grow more with less. Another key requirement consists of clear signals from policymakers, especially where land and water are limited, about the priority use of these resources — for example, irrigating low-value cereals to bolster food security versus applying the water to higher value crops and importing staple cereals.

Morning dew on a wheat spike. (Photo: Vadim Ganeyev/CIMMYT)
Morning dew on a wheat spike. (Photo: Vadim Ganeyev/CIMMYT)

Toward a sustainable dietary revolution

Future-proofing the global food system requires bold steps. Policy and research need to support a double transformation, centered on nutrition and sustainability.

CGIAR works toward nutritional transformation of our food system through numerous global partnerships. We give high priority to improving cereal crop systems and food products, because of their crucial importance for a growing world population. Recognizing that this alone will not suffice for healthy diets, we also strongly promote greater dietary diversity through our research on various staple crops and production systems and by raising public awareness of more balanced and nutritious diets.

To help achieve a sustainability transformation, CGIAR researchers and partners have developed a wide array of techniques that use resources more efficiently, enhance the resilience of food production in the face of climate change and reduce greenhouse gas emissions, while achieving sustainable increases in crop yields. At the same time, we are generating new evidence on which techniques work best under what conditions to target the implementation of these solutions more effectively.

The ultimate impact of our work depends crucially on the growing resolve of developing countries to promote better diets and more sustainable food production through strong policies and programs. CGIAR is well prepared to help strengthen these measures through research for development, and we are confident that our work on cereals, with continued donor support, will have high relevance, generating a wealth of innovations that help drive the transformation of global food systems.

Martin Kropff is the Director General of the International Maize and Wheat Improvement Center (CIMMYT).

Matthew Morell is the Director General of the International Rice Research Institute (IRRI).

Ten things you should know about maize and wheat

Written by Mike Listman on . Posted in Features.

As the calendar turns to October 16, it is time to celebrate World Food Day. At the International Maize and Wheat Improvement Center (CIMMYT), we are bringing you a few facts you should know about maize and wheat, two of the world’s most important crops.

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1. Billions of people eat maize and wheat.

Wheat is eaten by 2.5 billion people in 89 countries. About 1 billion of them live on less than $1.90 a day and depend on wheat as their main food.

Maize is the preferred staple food for 900 million poor consumers and the most important food crop in sub-Saharan Africa.

According to 2017 figures, maize is grown on 197 million hectares. Wheat covers 218 million hectares, an area larger than France, Germany, Italy, Spain and the UK combined. The total annual harvest of these two crops amounts to about 1.9 billion tons of grain.

A little girl eats a freshly-made roti while the women of her family prepare more, at her home in the village of Chapor, in the district of Dinajpur, Bangladesh. (Photo: S. Mojumder/Drik/CIMMYT)
A little girl eats a freshly-made roti while the women of her family prepare more, at her home in the village of Chapor, in the district of Dinajpur, Bangladesh. (Photo: S. Mojumder/Drik/CIMMYT)

2. Of the 300,000 known edible plant species, only 3 account for around 60% of our calories and proteins: maize, wheat and rice.

About 300,000 of the plant species on Earth could be eaten, but humans eat a mere 200 species globally.

Approximately 75% of the world’s food is generated from only 12 plants and 5 animal species. In fact, more than half of our plant-sourced protein and calories come from just three species: maize, rice and wheat.

Farmers Kanchimaya Pakhrin and her neighbor Phulmaya Lobshan weed rice seedling bed sown by machine in Purnabas, Kanchanpur, Nepal. (Photo: P. Lowe/CIMMYT)
Farmers Kanchimaya Pakhrin and her neighbor Phulmaya Lobshan weed rice seedling bed sown by machine in Purnabas, Kanchanpur, Nepal. (Photo: P. Lowe/CIMMYT)

3. CIMMYT manages humankind’s most diverse maize and wheat collections.

The organization’s germplasm bank, also known as a seed bank, is at the center of its crop-breeding research. This remarkable, living catalog of genetic diversity is comprised of over 28,000 unique seed collections of maize and 150,000 of wheat.

From its breeding programs, CIMMYT sends half a million seed packages to 800 partners in 100 countries each year. With researchers and farmers, the center also develops and promotes more productive and precise maize and wheat farming methods and tools that save money and resources such as soil, water, and fertilizer.

Shelves filled with maize seed samples make up the maize active collection in the Wellhausen-Anderson Plant Genetic Resources Center at CIMMYT's global headquarters in Texcoco, Mexico. Disaster-proof features of the bank include thick concrete walls and back-up power systems. (Photo: Xochiquetzal Fonseca/CIMMYT)
Shelves filled with maize seed samples make up the maize active collection in the Wellhausen-Anderson Plant Genetic Resources Center at CIMMYT’s global headquarters in Texcoco, Mexico. Disaster-proof features of the bank include thick concrete walls and back-up power systems. (Photo: Xochiquetzal Fonseca/CIMMYT)

4. Maize and wheat are critical to a global food system makeover.

In 2010, agriculture accounted for about one-quarter of global greenhouse gas emissions.

High-yield and climate-resilient maize and wheat varieties, together with a more efficient use of resources, are a key component of the sustainable intensification of food production needed to transform the global food system.

Miguel Ku Balam (left), from Mexico's Quintana Roo state, cultivates the traditional Mesoamerican milpa system. "My family name Ku Balam means 'Jaguar God'. I come from the Mayan culture," he explains. "We the Mayans cultivate the milpa for subsistence. We don't do it as a business, but rather as part of our culture — something we inherited from our parents." (Photo: Peter Lowe/CIMMYT)
Miguel Ku Balam (left), from Mexico’s Quintana Roo state, cultivates the traditional Mesoamerican milpa system. “My family name Ku Balam means ‘Jaguar God’. I come from the Mayan culture,” he explains. “We the Mayans cultivate the milpa for subsistence. We don’t do it as a business, but rather as part of our culture — something we inherited from our parents.” (Photo: Peter Lowe/CIMMYT)

5. We must increase maize and wheat yields to keep feeding the world.

By the year 2050, there will be some 9.7 billion people living on Earth. To meet the growing demand from an increasing population and changing diets, maize yields must go up at least 18% and wheat yields 15% by 2030, despite hotter climates and more erratic precipitation.

Farmers walk through a wheat field in Lemo district, Ethiopia. (Photo: P. Lowe/CIMMYT)
Farmers walk through a wheat field in Lemo district, Ethiopia. (Photo: P. Lowe/CIMMYT)

6. Climate-smart farming allows higher yields with fewer greenhouse gas emissions.

Decades of research and application by scientists, extension workers, machinery specialists, and farmers have perfected practices that conserve soil and water resources, improve yields under hotter and dryer conditions, and reduce the greenhouse gas emissions and pollution associated with maize and wheat farming in Africa, Asia, and Latin America.

Kumbirai Chimbadzwa (left) and Lilian Chimbadzwa stand on their field growing green manure cover crops. (Photo: Shiela Chikulo/CIMMYT)
Kumbirai Chimbadzwa (left) and Lilian Chimbadzwa stand on their field growing green manure cover crops. (Photo: Shiela Chikulo/CIMMYT)

7. Wholegrain wheat is good for your health.

An exhaustive review of research on cereal grains and health has shown that eating whole grains, such as whole-wheat bread and other exceptional sources of dietary fiber, is beneficial for human health and associated with a reduced risk of cancer and other non-communicable diseases.

According to this study, consumption of whole grains is associated with a lower risk of coronary disease, diabetes, hypertension, obesity and overall mortality. Eating whole and refined grains is beneficial for brain health and associated with reduced risk for diverse types of cancer. Evidence also shows that, for the general population, gluten- or wheat-free diets are not inherently healthier and may actually put individuals at risk of dietary deficiencies.

Whole wheat bread. (Photo: Rebecca Siegel/Flickr)
Whole wheat bread. (Photo: Rebecca Siegel/Flickr)

8. Biofortified maize and wheat are combating “hidden hunger.”

“Hidden hunger” is a lack of vitamins and minerals. More than 2 billion people worldwide are too poor to afford diverse diets and cannot obtain enough critical nutrients from their staple foods.

To help address this, CIMMYT — along with HarvestPlus and partners in 18 countries — is promoting more than 60 maize and wheat varieties whose grain contains more of the essential micronutrients zinc and provitamin A. These biofortified varieties are essential in the fight against “hidden hunger.”

A 2015 study published in The Journal of Nutrition found that vitamin A-biofortified orange maize significantly improves visual functions in children, like night vision. (Photo: Libby Edwards/HarvestPlus)
A 2015 study published in The Journal of Nutrition found that vitamin A-biofortified orange maize significantly improves visual functions in children, like night vision. (Photo: Libby Edwards/HarvestPlus)

9. 53 million people are benefiting from drought-tolerant maize.

Drought-tolerant maize developed by CIMMYT and partners using conventional breeding provides at least 25% more grain than conventional varieties in dry conditions in sub-Saharan Africa — this represents as much as 1 ton per hectare more grain on average.

These varieties are now grown on nearly 2.5 million hectares, benefiting an estimated 6 million households or 53 million people.

One study shows that drought-tolerant maize varieties can provide farming families in Zimbabwe an extra 9 months of food at no additional cost.

 

10. Quality protein maize is helping reduce child malnutrition.

Developed by CIMMYT during the 1970s and 1980s and honored by the 2000 World Food Prize, quality protein maize features enhanced levels of lysine and tryptophan, essential amino acids that can help reduce malnutrition in children whose diets rely heavily on maize.

Two girls eat biofortified maize in Mukushi, Zambia. (Photo: Silke Seco/DFID)
Two girls eat biofortified maize in Mukushi, Zambia. (Photo: Silke Seco/DFID)

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Wheat grains prepared for placement in a Thousand Grain Weight machine. (Photo: Marcia MacNeil/CIMMYT)

A fresh look at the genes behind grain weight in spring bread wheat

Written by Marcia MacNeil on . Posted in News.

Guillermo Garcia Barrios, a co-author of the study and student at Colegio de Postgraduados in Montecillo, Mexico, with a PHERAstar machine used to validate genetic markers. (Photo: Marcia MacNeil/CIMMYT)
Guillermo Garcia Barrios, a co-author of the study and student at Colegio de Postgraduados in Montecillo, Mexico, with a PHERAstar machine used to validate genetic markers. (Photo: Marcia MacNeil/CIMMYT)

To meet the demand for wheat from a rising and quickly urbanizing population, wheat yields in farmers’ fields must increase by an estimated 1.5% each year through 2030.

Of all the factors that influence yield, grain weight is the trait that is most stable and heritable for use in breeding improved wheat varieties. Breeders measure this by thousand grain weight (TGW).

Over the years, molecular scientists have made efforts to identify genes related to increased TGW, in order to speed up breeding through marker-assisted selection (MAS). Using MAS, breeders can select parents that contain genes related to the traits they are looking for, increasing the likelihood they will be passed on and incorporated in a new variety.

There have been some limited successes in these efforts: in the past years, a few genes related to increased TGW have been cloned, and a set of genetic markers have been determined to be used for MAS. However, the effects of most of these candidate genes have not yet been validated in diverse sets of wheat germplasm throughout the world that represent the full range of global wheat growing environments.

A group of wheat geneticists and molecular breeders from the International Maize and Wheat Improvement Center (CIMMYT) has recently conducted a thorough study to confirm the effects of the favorable alleles reported for these genes on TGW in CIMMYT wheat, and to identify new genetic determinants of this desired trait.

They found some good news and some bad news.

First, the good news: focusing on more than 4,000 lines of CIMMYT wheat germplasm they found 15 haplotype blocks significantly associated with TGW. Four haplotype blocks associated with TGW were also associated with grain yield — a grand prize for breeders, because in general the positive association of grain yield with TGW is less profound and sometimes even negative. However, of the 14 genes that had been previously reported to increase TGW, only one in CIMMYT’s 2015-2016 Elite Yield Trial and two in Wheat Associative Mapping Initiative panel were shown to have significant TGW associations.

Wheat grains prepared for placement in a Thousand Grain Weight machine. (Photo: Marcia MacNeil/CIMMYT)
Wheat grains prepared for placement in a Thousand Grain Weight machine. (Photo: Marcia MacNeil/CIMMYT)

The scientists also found that the alleles — pairs of genes on a chromosome that determine heredity — that were supposedly favorable to TGW actually decreased it.  These candidate genes also appear to vary in their TGW effects with genetic background and/or environment.

Thus, these findings also provide a foundation for more detailed investigations, opening the door for more studies on the genetic background dependence and environment sensitivity of the known candidate genes for TGW.

“Our findings indicate that it will be challenging to use MAS based on these existing markers across individual breeding programs,” said Deepmala Sehgal, CIMMYT wheat geneticist and the primary author of the study.

However, efforts to identify new genetic determinants of TGW were promising. The authors’ study of CIMMYT germplasm found one locus on chromosome 6A that showed increases of up to 2.60 grams in TGW and up to 258 kilograms per hectare in grain yield.

Thousand Grain Weight is measured in this machine at CIMMYT’s global headquarters in Texcoco, Mexico. (Photo: Marcia MacNeil/CIMMYT)
Thousand Grain Weight is measured in this machine at CIMMYT’s global headquarters in Texcoco, Mexico. (Photo: Marcia MacNeil/CIMMYT)

This discovery expands opportunities for developing diagnostic markers to assist in multi-gene pyramiding — a process that can derive new and complementary allele combinations for enhanced wheat TGW and grain yield.

Most of all, the study highlights the strong need for better and more validation of the genes related to this and other traits, so that breeders can be sure they are using material that is confirmed to increase wheat grain weight and genetic yield.

“Our findings are very promising for future efforts to efficiently develop more productive wheat in both grain weight and grain yield,” said Sehgal. “This ultimately means more bread on household tables throughout the world.”

“Validation of Candidate Gene-Based Markers and Identification of Novel Loci for Thousand-Grain Weight in Spring Bread Wheat” in Frontiers in Plant Science by Deepmala Sehgal, Suchismita Mondal, Carlos Guzman, Guillermo Garcia Barrios, Carolina Franco, Ravi Singh and Susanne Dreisigacker was supported by funding from the CGIAR Research Program on Wheat (WHEAT), the Delivering Genetic Gain in Wheat (DGGW) project funded by the Bill & Melinda Gates Foundation and the UK Department for International Development (DFID), and the US Agency for International Development (USAID) Feed the Future Innovation Lab for Applied Wheat Genomics.

Read the full article here: https://doi.org/10.3389/fpls.2019.01189

Hailemariam Ayalew

Written by Emma Orchardson on . Posted in Uncategorized.

Hailemariam Ayalew is a currently working as an Irish Council Post-Doctoral Fellow at Trinity College Dublin, based at CIMMYT, Ethiopia. He obtained his Ph.D and MSc degrees in Economics from the University of Copenhagen, Denmark.

Ayalew’s research examines the impacts of different random, quasi and natural experiments in developing countries. He is currently examining the impact of providing site-specific fertilizer recommendations on fertilizer usage, productivity and welfare outcomes in Ethiopia using a randomized control trial. He is also working on a number of field experiment projects in the country, including non-random errors in plot area estimation methods and intra-plot yield variation in maize farms.

A multi-crop, multi-use zero-tillage seeder at work on a conservation agriculture trial plot, left, at CIMMYT's headquarters in Texcoco, Mexico. The residues retained on the soil surface and the permanent raised beds are in clear contrast with the conventional plot on the right. (Photo: CIMMYT)

Scientists propose a low-cost, reliable system to measure soil organic carbon

Written by Alison Doody on . Posted in News.

A multi-crop, multi-use zero-tillage seeder at work on a conservation agriculture trial plot, left, at CIMMYT's headquarters in Texcoco, Mexico. The residues retained on the soil surface and the permanent raised beds are in clear contrast with the conventional plot on the right. (Photo: CIMMYT)
A multi-crop, multi-use zero-tillage seeder at work on a conservation agriculture trial plot, left, at CIMMYT’s headquarters in Texcoco, Mexico. The residues retained on the soil surface and the permanent raised beds are in clear contrast with the conventional plot on the right. (Photo: CIMMYT)

New research by an international team of scientists, including International Maize and Wheat Improvement Center (CIMMYT) Director for the Integrated Development Program, Bram Govaerts, outlines a proposed accounting system for organic carbon in soils that could encourage farmers to adopt better land management practices and increase levels of organic carbon in their soil.

Reported this month in the journal Carbon Management, the study highlights how increasing soil organic carbon (SOC) would build agricultural resilience and fertility and reduce greenhouse gas emissions — but we need to be able to measure it.

Soil is a huge carbon reservoir — in fact, soils contain one of the largest organic carbon stocks on the planet. With proper land management, soils have the potential to store even more. Improved SOC levels have also been connected with improved soil quality, reduced susceptibility to erosion and greater agricultural yields and yield stability, particularly under drought. This makes them a crucial player in climate change mitigation and agricultural resilience.

Policy makers and environmental groups are becoming increasingly interested in soil health and its effect on climate change. The 4 per 1000 initiative, launched at the COP 21 climate talks in Paris in 2015, argues that an annual growth rate of 0.4% in soil carbon stocks would significantly reduce human activity-related CO2 concentrations in the atmosphere. The most recent Intergovernmental Panel on Climate Change (IPCC) assessment highlights carbon sequestration as one of the options, alongside massive fossil fuel reduction, to keep warming below 2 degrees Celsius, in accordance with the Paris Climate Agreement.

Increasing organic carbon content in soils also has another very important function: crop nutrition. Last year, researchers from CIMMYT and the Nature Conservancy found that wheat grown on soils rich in organic matter had more essential nutrients like zinc and protein.

However, increasing levels of organic carbon in the soil can be costly in the short term, so farmers need to see improvements in the performance of their soils as a result of their efforts.

Quantifying soil carbon

That’s where a global soil information system comes in. By integrating empirical models, expanded measurement and monitoring networks, remote sensing and crowdsourced management data, SOC stocks can be assessed efficiently and reliably. Farmers and policy makers would get a clear picture of how much soil organic carbon is increasing and at what rate.

The global soil information system would work by pulling different sources of existing information together to provide a comprehensive account of soil organic carbon stocks worldwide.

As SOC content can vary over time, an important component of the system would involve using monitoring networks at precise locations which can then be resampled regularly. Alongside this information, empirical models would be used to predict SOC changes based on already observed results from lab- and field-based experiments, and to predict the impacts of different soil and climate conditions. Remote sensing data can provide information on land cover, crop species and land management practices at a very low cost, to supplement and verify management activity data reported by land users.

The international team of scientists pointed out that greater coordination and transparency among scientists, remote sensing specialists and land managers is crucial to the success of a global soil information system.

Incentivizing carbon sequestration among land managers is no mean task. The authors argue that existing approaches like direct compensation to farmers for CO2 removal and storage, government subsidies such as the European Union’s Common Agricultural Policy (CAP) and the option of earning a premium price for producing sustainable agricultural products, need a reliable carbon accounting system to ensure their success. A global soil information system might just hold the key.

Read the full article:
“Quantifying carbon for agricultural soil management: from the current status toward a global soil information system” in Carbon Management, DOI: 10.1080/17583004.2019.1633231

This study was made possible through the support provided by the TomKat Foundation. Additional support was provided by the NASA Harvest Consortium (www.nasaharvest.org), a multi-disciplinary program that empowers informed agricultural decisions through the use of Earth observations.

Bread wheat improvement using genomic tools will be critical to accelerate genetic gains in the crop's yield, disease resistance, and climate resilience. (Photo: Apollo Habtamu/CIMMYT)

Large-scale genomics will improve the yield, climate-resilience, and quality of bread wheat, new study shows

Written by Mike Listman on . Posted in Press releases. 2 Comments on Large-scale genomics will improve the yield, climate-resilience, and quality of bread wheat, new study shows

Bread wheat improvement using genomic tools will be critical to accelerate genetic gains in the crop's yield, disease resistance, and climate resilience. (Photo: Apollo Habtamu/CIMMYT)
Bread wheat improvement using genomic tools will be critical to accelerate genetic gains in the crop’s yield, disease resistance, and climate resilience. (Photo: Apollo Habtamu/CIMMYT)

Using the full wheat genome map published in 2018, combined with data from field testing of wheat breeding lines in multiple countries, an international team of scientists has identified significant new chromosomal regions for wheat yield and disease resistance and created a freely-available collection of genetic information and markers for more than 40,000 wheat lines.

Reported today in Nature Genetics, the results will speed up global efforts to breed more productive and climate-resilient varieties of bread wheat, a critical crop for world food security that is under threat from rising temperatures, rapidly-evolving fungal pathogens, and more frequent droughts, according to Philomin Juliana, wheat scientist at the International Maize and Wheat Improvement Center (CIMMYT) and first author of the new study.

“This work directly connects the wheat genome reference map with wheat lines and extensive field data from CIMMYT’s global wheat breeding network,” said Juliana. “That network in turn links to over 200 breeding programs and research centers worldwide and contributes to yield and other key traits in varieties sown on nearly half the world’s wheat lands.”

The staple food for more than 2.5 billion people, wheat provides 20% of human dietary calories and protein worldwide and is critical for the nutrition and food security of hundreds of millions of poor persons in regions such as North Africa and South Asia.

“Farmers and societies today face new challenges to feed rising and rapidly-urbanizing populations, and wheat epitomizes the issues,” said Ravi Singh, CIMMYT wheat breeder and corresponding author of the study. “Higher temperatures are holding back yields in major wheat-growing areas, extreme weather events are common, crop diseases are spreading and becoming more virulent, and soil and water are being depleted.”

Juliana said the study results help pave the way to apply genomic selection, an approach that has transformed dairy cow husbandry, for more efficient wheat breeding.

“Molecular markers are getting cheaper to use; meanwhile, it’s very costly to do field testing and selection involving many thousands of wheat plants over successive generations,” Juliana said. “Genome-wide marker-based selection can help breeders to precisely identify good lines in early breeding generations and to test plantlets in greenhouses, thereby complementing and streamlining field testing.”

The new study found that genomic selection could be particularly effective in breeding for wheat end-use quality and for resistance to stem rust disease, whose causal pathogen has been evolving and spreading in the form of highly-virulent new races.

The new study also documents the effectiveness of the global public breeding efforts by CIMMYT and partners, showing that improved wheat varieties from this work have accumulated multiple gene variants that favor higher yields, according to Hans-Joachim Braun, director of CIMMYT’s global wheat program.

“This international collaboration, which is the world’s largest publicly-funded wheat breeding program, benefits farmers worldwide and offers high-quality wheat lines that are released directly to farmers in countries, such as Afghanistan, that are unable to run a full-fledged wheat breeding program,” Braun explained.

The study results are expected to support future gene discovery, molecular breeding, and gene editing in wheat, Braun said.

Together with more resource-efficient cropping systems, high-yielding and climate-resilient wheat varieties will constitute a key component of the sustainable intensification of food production described in Strategy 3 of the recent EAT-Lancet Commission recommendations to transform the global food system. Large-scale genomics will play a key role in developing these varieties and staying ahead of climate- and disease-related threats to food security.

Funders of this work include USAID’s Feed the Future Innovation Lab for Applied Wheat Genomics. Contributing to the research described are research teams engaged in wheat improvement at CIMMYT, and the lab of Jesse Poland, Associate Professor at Kansas State University and Director of the USAID Applied Wheat Genomics Innovation Lab.

For more information, or to arrange interviews with the researchers, please contact:

Marcia MacNeil, Wheat Communications Officer, CIMMYT
M.MacNeil@cgiar.org, +52 (55) 5804 2004, ext. 2070

MarĂ­a Elida Cruz, a farmer in Chiapas, Mexico. (Photo: Peter Lowe/CIMMYT)

Embracing change: How family farmers can face the future

Written by Rodrigo Ordóñez on . Posted in Features.

This year opens the Decade of Family Farming (#FamilyFarmingDecade), which aims to improve the life of family farmers around the world. In an earnest discussion, two leaders in the global agriculture community reflect on the challenges facing family farmers, the promises of high- and low-tech solutions, and their hopes for the future.

A conversation between Martin Kropff, Director General of the International Maize and Wheat Improvement Centre (CIMMYT) and Trevor Nicholls, CEO of CABI.

On the unique challenges facing family farms

Trevor Nicholls (CABI): Family farmers come in many shapes and sizes but for me, the words “family farmer” bring a focus on smallholders and people who are starting on a journey of making a farming business. It depends on which part of the world you’re talking about; a family farm in the UK is perhaps very different to a small family farm in Ethiopia. And family farms can grow from just a small plot to being quite large commercial enterprises.

Martin Kropff (CIMMYT): All agriculture started with family farms. Fifty years ago in my home country, the Netherlands, farms were almost all family farms. When we look globally, farms in places like India, Pakistan, and Kenya are very often small, and the whole family is involved.

KROPFF: When the whole family is involved, gender dynamics come out. In a way, family farming is very often the farming done by women. This makes women the most important players in agriculture in many developing countries. It’s crucial to recognize this and understand their decision-making. For example, our research shows that men and women value different traits in crop varieties. We need to understand this to have successful interventions.

NICHOLLS: We’ve seen something similar through our Plantwise plant clinics, where farmers come for practical plant health advice. We see a definite pattern of men bringing in cash crops for advice, and women looking more at fruits and vegetables to feed their family. But overall, mostly men come into our clinics, particularly in certain parts of the world. We’re trying to encourage more female participation by timing the clinics so that they fit into women’s routines without getting in the way of taking care of elderly relatives or getting kids off to school. Sometimes really simple things can open up access and improve the gender balance.

KROPFF: When the whole family is involved, there are also downsides. In Africa, young people do much of the weeding.

NICHOLLS: That’s right, they may be pulled out of school for weeding.

KROPFF: This really worries me. Hand weeding is such hard labor, such an intensive use of energy; it seems like it should be something of the past. Children don’t want to do it anymore. My wife is from the generation where children still did weeding in the Netherlands. She remembers standing in the fields weeding when the sun was extremely warm while her friends were out doing other things.

NICHOLLS: It starts kids off on the wrong path, doesn’t it? If their experience of farming is backbreaking weeding from the age of 8 onwards, it’s highly unlikely to attract them into farming as a career.

A farmer uses a smartphone to access market information.
A farmer uses a smartphone to access market information.

On keeping young people interested in farming

NICHOLLS: We need to look at things like weed control as a social issue. It’s possible, for example, to use beneficial insects to limit the spread of certain weeds that infest farmland. Biocontrol and Integrated Pest Management should be seen as ways of reducing the spread of certain weeds, and also as ways to reduce the burden on women and youth.

KROPFF: I agree. Similarly, we’re finding that small-scale mechanization is making a difference for youth, and also women’s labor in Latin America, Africa and Asia, where CIMMYT has been introducing two-wheel tractors that can be engineered in local workshops. Suddenly, smallholders can harvest the entire wheat crop of 20 families in one day. This saves so much time, money, and effort, eliminating some of the “bad” labor that may discourage youth and unfairly burden women. Farmers can focus on the “nice” aspects of the business. It’s a real game changer for family farming.

NICHOLLS: Yes and this can also be amplified through digital technology. People refer to the “Uber-ization” of tractors, where farmers are able to hire a piece of mechanical equipment for a very short space of time, and maybe it even comes with an experienced driver or operator. We’re finding that digital tools like artificial intelligence, satellite imaging, smartphones, and other modern technologies, will intrigue youth anywhere in the world. These will hopefully have an impact on bringing more youth back into farming, as they start to see it as technologically enabled rather than straightforward muscle power.

On the transformations that need to happen

KROPFF: If we want to keep youth engaged, and improve farmers’ livelihoods, I think farming needs to become more entrepreneurial. Many family farms are only half a hectare. I think this has to grow somehow, though land rights and ownership are a challenge

NICHOLLS: As farming becomes more business-like in Africa then we’re going to see the same sort of consolidation that we saw in the United States and Europe, whereby farm sizes do get larger even if land ownership remains fragmented.

This could happen through cooperatives, which offer economies of scale and also help farmers spread the costs of things like access to inputs, advice, weather insurance and crop insurance. But we need to view cooperatives as more than a way to infuse new technologies into the farming system. They are in fact a channel for helping farmers gain stronger business skills, so they can get a better bargain for themselves.

KROPFF: In Mexico we are working with 300,000 smallholder farmers in a sustainable maize and wheat sourcing initiative. Rather than “pushing” new varieties and technologies at farmers, we help them partner with maize and wheat companies to create a local demand for high quality, sustainable products. Real scaling up, especially for wheat and maize, needs more than extension. Farmers need better links to the market.

NICHOLLS: If farms get larger and more mechanized, it means fewer people are involved in the business of farming. This shift means that people will need other rural occupations, so that they don’t just leave the land and move to the city. We need investments in other productive activities in rural areas. This could be around post-harvest processing of crops: adding value locally rather than shipping the raw materials elsewhere.

KROPFF: Exactly. We’ve been doing more work on this in the last ten years. CIMMYT works on wheat and maize, and these are products that need to be processed. Doing this locally would also help people save food in the future for more difficult times, instead of selling to someone from the city who may buy it for an unfair price. Farmers these days have access via smartphones to market information, which is empowering. We see it happening in Africa. It’s really crucial.

NICHOLLS: We’re certainly seeing the power of digital technologies, which are also helping us move beyond just responding to crop pests and diseases to being able to get better at predicting outbreaks on a micro-scale. By linking ground observations through our Plantwise clinics with satellite observation technology and data, we’ve developed a program called PRISE (Pest Risk Information SErvice), which provides farmers with alerts before a pest is likely to reach its peak point, so that they can be prepared and take preventative measures.

KROPFF: Without a doubt, smallholder farmer communities are rapidly entering the digital age, and tools on weather prediction, selection of varieties, market information are very important and transforming the way people farm.

A farmer requests weather information via SMS.
A farmer requests weather information via SMS.

On climate change

KROPFF: Climate change is going to be the issue affecting family farmers, especially in Asia and Africa where the population will grow by 2 billion people who need food that has been produced on their own continents. Yields have to rise and climate change brings yields down. We have to help smallholder family farmers keep doing their job and ensure crop yields, which is why climate change is embedded into 70% of our work at CIMMYT. One major area is developing and testing heat- and drought-tolerant varieties that suit local climates. Last year I was in Zimbabwe, which was experiencing El Niño, and I was very impressed by the difference in maize yields from drought and heat-tolerant varieties compared to the normal varieties.

NICHOLLS: That’s very good. In addition to drought and heat, we see pests and diseases appearing in new places as a result of climate change. Pests and diseases will cause crop losses of up to 40% on average. Stemming those losses is critical. We’re seeing invasive species, such as fall armyworm, and many invasive weeds and trees that are effectively stealing arable and pastoral land from farmers, as well as water resources.

Pest-resistant crops have great long-term potential, but farmers also need short-term solutions while they wait for new varieties to become available. One of CABI’s strengths is scanning for solutions from other parts of the world. With fall armyworm, we are looking to South America, where the pest originates, for solutions and natural enemies. We’re also scanning our fungal culture collection for samples that may have properties that can form the basis for biopesticides, and therefore open up a program of biological control.

Hopes for the future

NICHOLLS: I’m very optimistic for family farmers. They are incredibly resilient and resourceful people, and they survive and thrive in pretty difficult circumstances. But the world is getting more challenging for them by the day. I think the Sustainable Development Goals (SDGs) have framed many of the issues very well, in terms of food security and livelihoods, sustainable consumption and production, and this will help to focus attention on family farmers.

I do see some quite encouraging signs, particularly in Africa, where the CAADP (Comprehensive Africa Agricultural Development Programme) has brought much greater coordination among countries. We’re seeing more unity in the requests we receive from our member countries to help them address the issues that are in the SDGs. That makes the work of our organizations easier, because we’re addressing a broader set of demands. And in turn, that will benefit family farmers.

Technology, be it biotechnology or telecommunications and ICTs, is becoming so much more affordable over time. The rate that smartphone usage is spreading in Africa and Asia is incredible. In many areas we actually have most of the technology we need today. It’s about getting it put into practice effectively with large numbers of farmers. So I remain very optimistic about the future.

KROPFF: I’m an optimist by nature. That’s also why I’m in this job: it’s not easy, but I really believe that change is possible if we have our act together and collaborate with CABI and other international research partners, national systems and the private sector. For a long time, people said that there was no Green Revolution in Africa, where yields remained one ton per hectare. But today we see yields increasing in countries like Nigeria, and in Ethiopia, where maize yields are 3.5 tons per hectare. Good things are happening because of family farming.

I believe that to increase yields you need three components: better seeds for more resilient crop varieties; sustainable intensification to grow more nutritious food per unit of water, land and soil; and good governance, to properly manage resources. We need to invest in all of these areas.

NICHOLLS: I fully agree. We need to work on all these areas, and harness the power of modern technology to help family farmers thrive now, and in the future.

This interview has been edited for length and clarity.

Learn more about key actions needed to support family farmers: CIMMYT and family farming

Join the conversation at #FamilyFarmingDecade.

Starting machinery to husk maize cobs at Green Farm near Kitale, Trans-Nzoia. (Photo: Peter Lowe/CIMMYT)

Study proposes alternative to conventional technology adoption research in smallholder agriculture

Written by Mary Donovan on . Posted in News.

Starting machinery to husk maize cobs at Green Farm near Kitale, Trans-Nzoia. (Photo: Peter Lowe/CIMMYT)
Starting machinery to husk maize cobs at Green Farm near Kitale, Trans-Nzoia. (Photo: Peter Lowe/CIMMYT)

The development community is introducing increasingly complex and systemic technological designs for sustainable improvements to agriculture. Yet, a systemic perspective is hard to find in “adoption-outcome” focused analyses of technological change processes. In order to improve development interventions, it is necessary not only to analyze both successes and failures, but also the process and impacts of technological change.

Researchers at the International Maize and Wheat Improvement Center (CIMMYT) and the Institute of Development Studies (IDS) recently published a paper on rethinking technological change in smallholder agriculture, arguing against the conventional approach to studying technology adoption.

The problem with the concept of technology adoption

While the adoption rate of newly introduced technologies is still used in the evaluation of agricultural research and development, the theory of technology adoption is an insufficient framework for understanding technological change. It is too linear, too binary, too focused on individual decisions and gives an inaccurate and misleading picture to researchers.

The theory of adoption treats technology like a “black box” that is transferred smoothly from one setting to another, following a linear progression of old and inferior tools and methods to new improved ones. This theory is too simplistic to align with the complex realities of the capabilities and agency of multiple actors. In addition, in cases of participatory technology development, where intended users are involved in the creation of innovations, adoption rates are often limited due to the relatively small scale of the project.

Using adoption rate as the only indicator of success or failure can lead researchers to ignore wider impacts of the introduction of a new technology. Adoption rates could go up, but use of a new technology could cause harm to social relations, the local environment, or its resilience. Low adoption rates could classify a program as a failure, while farmers benefited substantially in undetected ways, for example forming networks or acquiring new skills and knowledge. A singular focus on adoption rates thus limits our understanding of what happens in processes of technological change.

Farmer Kausila Chanara direct dry seeding rice in Ramghat, Surkhet, Nepal. (Photo: Peter Lowe/CIMMYT).
Farmer Kausila Chanara direct dry seeding rice in Ramghat, Surkhet, Nepal. (Photo: Peter Lowe/CIMMYT)

An alternative conceptual framework

In addition to the introduction of a new technology to small-scale farming systems, technological change involves the agency of many social actors. The agency of farmers, scientists, project managers and extension officers is key to understand whether a new technology is perceived to be useful, accessible or realistic, as well as how it is adjusted and changing social relations.

A new framework is needed to capture this reconfiguration of social and technological components that result from the introduction of a new technology to a community.

The authors of this paper propose an alternative conceptual framework with an agent-, practice- and process-oriented approach to better understand technological change. The framework is composed of four key components: propositions, encounters, dispositions and responses.

Propositions are composed of artefacts, methods, techniques and practices and a proposed mode of engagement in agricultural production. Encounters can be deliberately organized, for example a field day, or spontaneous, when a farmer sees a neighbor using a new tool. Intended users of technology may be disposed to respond in a variety of different ways, and dispositions may change over time. Finally, responses are a process or pathway that is likely to involve adjustment or recalibration to make the new technology work for the farmer.

Further work to operationalize this framework is needed. The authors suggest a next step of developing indicators to measure learning, experimentation and behavioral change as part of analyzing technological change processes.

Members of the International Wheat Yield Partnership (IWYP) which focuses on translational research to boost wheat yields.

Bottlenecks between basic and applied plant science jeopardize life-saving crop improvements

Written by Marcia MacNeil on . Posted in News.

Visitors at CIMMYT’s experimental station in Obregon, Mexico, where elite wheat lines are tested for new traits.
Visitors at CIMMYT’s experimental station in Obregon, Mexico, where elite wheat lines are tested for new traits.

For a number of reasons, including limited interdisciplinary collaboration and a dearth of funding, revolutionary new plant research findings are not being used to improve crops.

“Translational research” — efforts to convert basic research knowledge about plants into practical applications in crop improvement — represents a necessary link between the world of fundamental discovery and farmers’ fields. This kind of research is often seen as more complicated and time consuming than basic research and less sexy than working at the “cutting edge” where research is typically divorced from agricultural realities in order to achieve faster and cleaner results; however, modern tools — such as genomics, marker-assisted breeding, high throughput phenotyping of crop traits using drones, and speed breeding techniques — are making it both faster and cost-effective.

In a new article in Crop Breeding, Genetics, and Genomics, wheat physiologist Matthew Reynolds of the International Maize and Wheat Improvement Center (CIMMYT) and co-authors make the case for increasing not only funding for translational research, but the underlying prerequisites: international and interdisciplinary collaboration towards focused objectives and a visionary approach by funding organizations.

“It’s ironic,” said Reynolds. “Many breeding programs have invested in the exact technologies — such as phenomics, genomics and informatics — that can be powerful tools for translational research to make real improvements in yield and adaptation to climate, disease and pest stresses. But funding to integrate these tools in front-line breeding is quite scarce, so they aren’t reaching their potential value for crop improvement.”

Members of the International Wheat Yield Partnership (IWYP) which focuses on translational research to boost wheat yields.
Members of the International Wheat Yield Partnership (IWYP) which focuses on translational research to boost wheat yields.

Many research findings are tested for their implications for wheat improvement by the International Wheat Yield Partnership (IWYP) at the IWYP Hub, a centralized technical platform for evaluating innovations and building them into elite wheat varieties, co-managed by CIMMYT at its experimental station in Obregon, Mexico.

IWYP has its roots with the CGIAR Research Program on Wheat (WHEAT), which in 2010 formalized the need to boost both wheat yield potential as well as its adaptation to heat and drought stress. The network specializes in translational research, harnessing scientific findings from around the world to boost genetic gains in wheat, and capitalizing on the research and pre-breeding outputs of WHEAT and the testing networks of the International Wheat Improvement Network (IWIN). These efforts also led to the establishment of the Heat and Drought Wheat Improvement Consortium (HeDWIC).

“We’ve made extraordinary advances in understanding the genetic basis of important traits,“ said IWYP’s Richard Flavell, a co-author of the article. “But if they aren’t translated into crop production, their societal value is lost.”

The authors, all of whom have proven track records in both science and practical crop improvement, offer examples where exactly this combination of factors led to the impactful application of innovative research findings.

  • Improving the Vitamin A content of maize: A variety of maize with high Vitamin A content has the potential to reduce a deficiency that can cause blindness and a compromised immune system. This development happened as a result of many translational research efforts, including marker-assisted selection for a favorable allele, using DNA extracted from seed of numerous segregating breeding crosses prior to planting, and even findings from gerbil, piglet and chicken models — as well as long-term, community-based, placebo-controlled trials with children — that helped establish that Vitamin A maize is bioavailable and bioefficacious.
  • Flood-tolerant rice: Weather variability due to climate change effects is predicted to include both droughts and floods. Developing rice varieties that can withstand submergence in water due to flooding is an important outcome of translational research which has resulted in important gains for rice agriculture. In this case, the genetic trait for flood tolerance was recognized, but it took a long time to incorporate the trait into elite germplasm breeding programs. In fact, the development of flooding tolerant rice based on a specific SUB 1A allele took over 50 years at the International Rice Research Institute in the Philippines (1960–2010), together with expert molecular analyses by others. The translation program to achieve efficient incorporation into elite high yielding cultivars also required detailed research using molecular marker technologies that were not available at the time when trait introgression started.

Other successes include new approaches for improving the yield potential of spring wheat and the discovery of traits that increase the climate resilience of maize and sorghum.

One way researchers apply academic research to field impact is through phenotyping. Involving the use of cutting edge technologies and tools to measure detailed and hard to recognize plant traits, this area of research has undergone a revolution in the past decade, thanks to more affordable digital measuring tools such as cameras and sensors and more powerful and accessible computing power and accessibility.

Scientists are now able to identify at a detailed scale plant traits that show how efficiently a plant is using the sun’s radiation for growth, how deep its roots are growing to collect water, and more — helping breeders select the best lines to cross and develop.

An Australian pine at CIMMYT’s experimental station in Texoco, Mexico, commemorates the 4th symposium of the International Plant Phenotyping Network.
An Australian pine at CIMMYT’s experimental station in Texoco, Mexico, commemorates the 4th symposium of the International Plant Phenotyping Network.

Phenotyping is key to understanding the physiological and genetic bases of plant growth and adaptation and has wide application in crop improvement programs. Recording trait data through sophisticated non-invasive imaging, spectroscopy, image analysis, robotics, high-performance computing facilities and phenomics databases allows scientists to collect information about traits such as plant development, architecture, plant photosynthesis, growth or biomass productivity from hundreds to thousands of plants in a single day. This revolution was the subject of discussion at a 2016 gathering of more than 200 participants at the International Plant Phenotyping Symposium hosted by CIMMYT in Mexico and documented in a special issue of Plant Science.

There is currently an explosion in plant science. Scientists have uncovered the genetic basis of many traits, identified genetic markers to track them and developed ways to measure them in breeding programs. But most of these new findings and ideas have yet to be tested and used in breeding programs, wasting their potentially enormous societal value.

Establishing systems for generating and testing new hypotheses in agriculturally relevant systems must become a priority, Reynolds states in the article. However, for success, this will require interdisciplinary, and often international, collaboration to enable established breeding programs to retool. Most importantly, scientists and funding organizations alike must factor in the long-term benefits as well as the risks of not taking timely action. Translating a research finding into an improved crop that can save lives takes time and commitment. With these two prerequisites, basic plant research can and should positively impact food security.

Authors would like to acknowledge the following funding organizations for their commitment to translational research.

The International Wheat Yield Partnership (IWYP) is supported by the Biotechnology and Biological Sciences Research Council (BBSRC) in the UK; the U. S. Agency for International Development (USAID) in the USA; and the Syngenta Foundation for Sustainable Agriculture (SFSA) in Switzerland.

The Heat and Drought Wheat Improvement Consortium (HeDWIC) is supported by the Sustainable Modernization of Traditional Agriculture (MasAgro) Project by the Ministry of Agriculture and Rural Development (SADER) of the Government of Mexico; previous projects that underpinned HeDWIC were supported by Australia’s Grains Research and Development Corporation (GRDC).

The Queensland Government’s Department of Agriculture and Fisheries in collaboration with The Grains Research and Development Corporation (GRDC) have provided long-term investment for the public sector sorghum pre-breeding program in Australia, including research on the stay-green trait. More recently, this translational research has been led by the Queensland Alliance for Agriculture and Food Innovation (QAAFI) within The University of Queensland.

ASI validation work and ASI translation and extension components with support from the United Nations Development Programme (UNDP) and the Bill and Melinda Gates Foundation, respectively.

Financial support for the maize proVA work was partially provided by HarvestPlus (www.HarvestPlus.org), a global alliance of agriculture and nutrition research institutions working to increase the micronutrient density of staple food crops through biofortification. The CGIAR Research Program MAIZE (CRP-MAIZE) also supported this research.

The CGIAR Research Program on Wheat (WHEAT) is led by the International Maize and Wheat Improvement Center (CIMMYT), with the International Center for Agricultural Research in the Dry Areas (ICARDA) as a primary research partner. Funding comes from CGIAR, national governments, foundations, development banks and other agencies, including the Australian Centre for International Agricultural Research (ACIAR), the UK Department for International Development (DFID) and the United States Agency for International Development (USAID).

Institutional forces (arrows) alter the balance of (a) research and development (R&D) investments by the public relative to the private sector, (b) R&D emphasis on crops with low-value relative to high-value seed markets, which are often the crops of resource-poor versus resource-wealthy farmers, and therefore (c) who will benefit from the technologies as consumers of the improved crops. Achieving equity in access to the potential benefits of genetically engineered crops (or any technology, e.g., internet, cell phones, or radio) may require policy changes and actions (forces) to counterbalance prevailing trends. (Figure: Nancy Valtierra/CIMMYT)

Genome editing, gene drives, and synthetic biology: Will they contribute to disease-resistant crops, and who will benefit?

Written by Mike Listman on . Posted in News.

Ensuring the access of small-scale farmers to products and potential benefits from genetic engineering (GE) technologies for agriculture will require concerted investment and research by public institutions worldwide and particularly in low- and middle-income countries.

This was a key conclusion of a new review paper describing cutting-edge GE applications that offer exciting options to enhance the disease and pest resistance of important food crops and the ecological sustainability of cropping systems.

The technologies include gene editing (site-specific changes to DNA in a genome), gene drives (greatly enhancing or reducing frequency of genes that affect insect or pathogen reproduction), and synthetic biology (re-design or construction of biological devices, for example chromosomes or organelles).

Authored by international experts in policy, socioeconomics, and biological science, the new paper outlines potential uses of the technologies, particularly to address problems that affect resource-poor farmers or consumers, such as the viruses that attack cassava, the Striga weed that is a parasite of maize, or the fungal pathogen of groundnut that produces deadly toxins.

A weak capacity for research and development in many countries, combined with a small and declining public investment, raises questions about those nations’ ability to develop and deliver high-quality GE technologies or realize their benefits.

“The concern is that farmers not served by leading companies, who are developing the technologies, will be unable to obtain new, resistant crop varieties or other products of these technologies,” said Kevin Pixley, director of the genetic resources program of the International Maize and Wheat Improvement Center (CIMMYT) and first author of the new paper.

The technologies have already proven effective for controlling bacterial, fungal, and viral plant pathogens, as well as insects that transmit them. For example, GE approaches to control cassava brown streak disease and cassava bacterial blight—for which there are few or no known sources of resistance in cassava itself—appear on track to produce resistant versions of cassava.

Future gene drive technologies that can be kept within specific areas and reversed if needed may offer ways to control insects that carry plant diseases or weeds that damage crops, and synthetic biology could someday create plants that are immune to invading viruses.

Institutional forces (arrows) alter the balance of (a) research and development (R&D) investments by the public relative to the private sector, (b) R&D emphasis on crops with low-value relative to high-value seed markets, which are often the crops of resource-poor versus resource-wealthy farmers, and therefore (c) who will benefit from the technologies as consumers of the improved crops. Achieving equity in access to the potential benefits of genetically engineered crops (or any technology, e.g., internet, cell phones, or radio) may require policy changes and actions (forces) to counterbalance prevailing trends. (Figure: Nancy Valtierra/CIMMYT)
Institutional forces (arrows) alter the balance of public vs private research / development investments and the relative emphasis on low vs high value crops, factors that help determine who benefits (resource-poor vs wealthy farmers?) from the application of advanced technologies in crop breeding. (Figure: Nancy Valtierra/CIMMYT)

“The private sector is likely to invest mainly in major crops and major traits that will bring them profits, so work on minor, perennial, clonal, or staple food crops of lower-income countries may suffer,” said JosĂ© Falck-Zepeda, senior research fellow and leader of the policy team in the program for biosafety systems of the International Food Policy Research Institute (IFPRI) and a co-author of the review paper.

Many countries are still deciding whether and how they will regulate new GE products. The new paper explains how key factors including the cost and complexity of complying with biosafety regulations will shape the potential distribution of the technologies and products, determining which institutions undertake the related research and, as a result, which traits and crops are studied.

Civil society concerns regarding GE technologies and how or by whom they are deployed add important considerations to the complex questions surrounding the use of GE products.

“Realizing the potential of GE crops will require investments and policies for research, intellectual property regimes, and regulatory frameworks,” say the authors, “and societies must also address legitimate concerns about their responsible stewardship, agroecological sustainability, and equitable access to associated benefits.”

An open-access version of the full paper is available online:
https://doi.org/10.1146/annurev-phyto-080417-045954
Pixley, K.V., J.B. Falck-Zepeda, K.E. Giller, L.L. Glenna, F. Gould, C.A. Mallory-Smith, D.M. Stelly, and C.N. Stewart. 2019. Genome editing, gene drives, and synthetic biology: Will they contribute to disease-resistant crops, and who will benefit? Annu. Rev. Phytopathol 57:8.1–8.24.

See also the related feature by the International Food Policy Research Institute (IFPRI):
Will genetic engineering contribute to disease-resistant crops, and who will benefit?

Elite wheat varieties at CIMMYT’s experimental station in Ciudad Obregon, in Mexico's Sonora state. (Photo: Marcia MacNeil/CIMMYT)

Extensive use of wild grass-derived “synthetic hexaploid wheat” adds diversity and resilience to modern bread wheat

Written by Rodrigo Ordóñez on . Posted in Press releases.

Elite wheat varieties at CIMMYT’s experimental station in Ciudad Obregon, in Mexico's Sonora state. (Photo: Marcia MacNeil/CIMMYT)
Elite wheat varieties at CIMMYT’s experimental station in Ciudad Obregon, in Mexico’s Sonora state. (Photo: Marcia MacNeil/CIMMYT)

In a new study, scientists have found that genome segments from a wild grass are present in more than one in five of elite bread wheat lines developed by the International Maize and Wheat Improvement Center (CIMMYT).

Scientists at CIMMYT and other research institutes have been crossing wild goat grass with durum wheat — the wheat used for pasta — since the 1980s, with the help of complex laboratory manipulations. The new variety, known as synthetic hexaploid wheat, boosts the genetic diversity and resilience of wheat, notoriously vulnerable due to its low genetic diversity, adding novel genes for disease resistance, nutritional quality and heat and drought tolerance.

The study, which aimed to measure the effect of these long-term efforts using state-of-the-art molecular technology, also found that 20% of CIMMYT modern wheat lines contain an average of 15% of the genome segments from the wild goat grass.

“We’ve estimated that one-fifth of the elite wheat breeding lines entered in international yield trials has at least some contribution from goat grass,” said Umesh Rosyara, genomic breeder at CIMMYT and first author of the paper, which was published in Nature Scientific Reports. “This is much higher than expected.”

Although the synthetic wheat process can help bring much-needed diversity to modern wheat, crossing with synthetic wheat is a complicated process that also introduces undesirable traits, which must later be eliminated during the breeding process.

“Many breeding programs hesitate to use wild relatives because undesirable genomic segments are transferred in addition to desirable segments,” said Rosyara. “The study results can help us devise an approach to quickly eliminate undesirable segments while maintaining desirable diversity.”

CIMMYT breeding contributions are present in nearly half the wheat sown worldwide, many of such successful cultivars have synthetic wheat in the background, so the real world the impact is remarkable, according to Rosyara.

“With this retrospective look at the development and use of synthetic wheat, we can now say with certainty that the best wheat lines selected over the past 30 years are benefiting from the genes of wheat’s wild relatives,” he explained. “Even more, using cutting-edge molecular marker technology, we should be able to target and capture the most useful genes from wild sources and better harness this rich source of diversity.”

Modern breeders tread in nature’s footsteps

The common bread wheat we know today arose when an ancient grain called emmer wheat naturally cross-bred with goat grass around 10,000 years ago. During this natural crossing, very few goat grass genes crossed over, and as a result, current bread wheat is low in diversity for the genome contributed by goat grass. Inedible and considered a weed, goat grass still has desirable traits including disease resistance and tolerance to climate stresses.

Scientists sought to broaden wheat’s genetic diversity by re-enacting the ancient, natural cross that gave rise to bread wheat, crossing improved durum wheat or primitive emmer with different variants of goat grass. The resulting synthetic wheats were crossed again with improved wheats to help remove undesirable wild genome segments.

Once synthetic wheat is developed, it can be readily crossed with any elite wheat lines thus serving as a bridge to transfer diversity from durum wheat and wild goat grass to bread wheat. This helps breeders develop high yielding varieties with desirable traits for quality varieties and broad adaption.

CIMMYT is the first to use wheat’s wild relatives on such a large scale, and the synthetic derivative lines have been used by breeding programs worldwide to develop popular and productive bread wheat varieties. One example, Chuanmai 42, released in China in 2003, stood as the leading wheat variety in the Sichuan Basin for over a decade. Other synthetic derivative lines such as Sokoll and Vorobey appear in the lineage of many successful wheat lines, contributing crucial yield stability — the ability to maintain high yields over time under varying conditions.

The successful, large-scale use of genes from wheat’s wild relatives has helped broaden the genetic diversity of modern, improved bread wheat nearly to the level of the crop’s heirloom varieties. This diversity is needed to combat future environmental, pest, and disease challenges to the production of a grain that provides 20% of the calories consumed by humans worldwide.

This work was supported by the CGIAR Research Program on Wheat (WHEAT) and Seeds of Discovery (SeeD), a multi-project initiative comprising MasAgro Biodiversidad, a joint initiative of CIMMYT and the Ministry of agriculture and rural development (SADER) through the MasAgro (Sustainable Modernization of Traditional Agriculture) project; the CGIAR Research Programs on Maize (MAIZE) and Wheat (WHEAT); and a computation infrastructure and data analysis project supported by the UK’s Biotechnology and Biological Sciences Research Council (BBSRC).  CIMMYT’s worldwide partners participated in the evaluation of CIMMYT international wheat yield trials.

For more information, or to arrange interviews with the researchers, please contact:

Marcia MacNeil, Wheat Communications Officer, CIMMYT
M.MacNeil@cgiar.org, +52 (55) 5804 2004, ext. 2070

Rodrigo Ordóñez, Communications Manager, CIMMYT
r.ordonez@cgiar.org, +52 (55) 5804 2004, ext. 1167

About the CGIAR Research Program on Wheat
The CGIAR Research Program on Wheat (WHEAT) is led by the International Maize and Wheat Improvement Center (CIMMYT), with the International Center for Agricultural Research in the Dry Areas (ICARDA) as a primary research partner. Funding comes from CGIAR, national governments, foundations, development banks and other agencies, including the Australian Centre for International Agricultural Research (ACIAR),  the UK Department for International Development (DFID) and the United States Agency for International Development (USAID).

About CIMMYT
The International Maize and Wheat Improvement Center (CIMMYT) is the global leader in publicly funded maize and wheat research and related farming systems. Headquartered near Mexico City, CIMMYT works with hundreds of partners throughout the developing world to sustainably increase the productivity of maize and wheat cropping systems, thus improving global food security and reducing poverty. CIMMYT is a member of CGIAR and leads the CGIAR Research Programs on Maize and Wheat, and the Excellence in Breeding Platform. The center receives support from national governments, foundations, development banks and other public and private agencies.

WHEAT-sponsored journalists stand for a group photo with farmer Merle Rugg (top row, third from left), in Elstow, Saskatchewan. (Photo: Amit Bhattacharya)

Global group of journalists find wheat research, comradery in Canada

Written by Marcia MacNeil on . Posted in Features.

A diverse group of agriculture, food security, environment and science journalists gathered in Saskatoon, Canada recently for an intensive course in innovative wheat research, interviews with top international scientists and networking with peers.

The occasion was the International Wheat Congress (IWC), which convened more than 900 wheat scientists and researchers in Saskatoon, in Canada’s biggest wheat-growing province, Saskatchewan, to discuss their latest work to boost wheat productivity, resilience and nutrition.

Martin Kropff (right), Director General of the International Maize and Wheat Improvement Center (CIMMYT), speaks to the press at the International Wheat Congress. (Photo: Marcia MacNeil/CIMMYT)
Martin Kropff (right), Director General of the International Maize and Wheat Improvement Center (CIMMYT), speaks to the press at the International Wheat Congress. (Photo: Marcia MacNeil/CIMMYT)

The seven journalists were part of a group of 11 who won a competitive sponsorship offered by the CGIAR Research Program on Wheat (WHEAT). Seven journalists attended the conference, while another four followed the proceedings and activities from home. The ten-day immersive training included multiple daily press briefings with top scientists in climate change modeling and resilience testing, innovative breeding techniques, analysis and protection of wheat diversity and many more topics, on top of a full schedule of scientific presentations.

“The scientists were so eager to talk to us, and patient with our many questions,” said Nkechi Isaac, from the Leadership newspaper group in Nigeria. “Even the director general of [the International Maize and Wheat Improvement Center] CIMMYT spoke with us for almost an hour.”

“It was a pleasant surprise for me.”

The journalists, who come from regions as diverse as sub-Saharan Africa and East Asia, offered support and encouragement from their travel preparations though their time in Saskatoon and beyond — sharing story ideas, interview and site visit opportunities, news clips and photos through a WhatsApp group.

Linda McCandless (center) of Cornell University and David Hodson (left) of CIMMYT were among the panelists sharing tips on wheat news coverage at the journalist roundtable. (Photo: Matt Hayes/Cornell)
Linda McCandless (center) of Cornell University and David Hodson (left) of CIMMYT were among the panelists sharing tips on wheat news coverage at the journalist roundtable. (Photo: Matt Hayes/Cornell)

“It is really helpful to be connected to colleagues around the world,” said Amit Bhattacharya of the Times of India. “I know we will continue to be a resource and network for each other through our careers.”

The week wasn’t all interviews and note-taking. The journalists were able to experience Saskatchewan culture, from a tour of a wheat quality lab and a First Nations dance performance to a visit to a local wheat farm, and even an opportunity to see Saskatoon’s newest modern art gallery.

The media sponsorship at IWC aimed to encourage informed coverage of the importance of wheat research, especially for farmers and consumers in the Global South, where wheat is the main source of protein and a critical source of life for 2.5 billion people who live on less than $2 a day.

The group also spoke with members of the many coalitions that facilitate the collaboration that makes innovative wheat research possible, including the International Wheat Yield Partnership (IWYP), the Heat and Drought Wheat Improvement Consortium (HeDWIC) and the G20-organized Wheat Initiative.

“This is the first time we’ve invested this heavily in journalist training,” said WHEAT program director Hans Braun. “We think the benefits – for the journalists, who gained a greater understanding of wheat research issues, and for developing country audiences, who will be more aware of the importance of improving wheat –– are worth it.”

Lominda Afedraru (center) from Uganda’s Daily Monitor shares her experience covering science with participants at the journalist roundtable. (Photo: Marcia MacNeil/CIMMYT)
Lominda Afedraru (center) from Uganda’s Daily Monitor shares her experience covering science with participants at the journalist roundtable. (Photo: Marcia MacNeil/CIMMYT)

A roundtable discussion with peers from Canadian news organizations and seasoned science communications professionals and a networking breakfast with CIMMYT scientists provided platforms for a candid exchange on the challenges and opportunities in communicating wheat science in the media.

A common refrain was the importance of building relationships between scientists and media professionals – because wheat science offers dramatic stories for news audiences, and an informed and interested public can in turn lead to greater public investment in wheat science. The journalists and scientists in Saskatoon have laid a solid foundation for these relationships.

The sponsored journalists are:

Amit Bhattacharya: Senior Editor at The Times of India, New Delhi, and a member of the team that produces the front page of India’s largest English daily. He writes on Indian agriculture, climate change, the monsoon, weather, wildlife and science. A 26-year professional journalist in India, he is a Jefferson Fellow on climate change at the East-West Center, Hawaii.

Emmanuelle Landais: Freelance journalist based in Dakar, Senegal, currently reporting for Deutsche Welle’s radio service in English and French on the environment, technology, development and youth in Africa. A former line producer for France 24 in Paris and senior environment reporter for the daily national English newspaper Gulf News in Dubai, she also reports on current affairs for the Africalink news program, contributes to Radio France International’s (RFI) English service, and serves as news producer for the Dakar-based West Africa Democracy Radio.

Julien Chongwang: Deputy Editor, SciDev.Net French edition. He is based in Douala, Cameroon, where he has been a journalist since 2002. Formerly the editor of the The Daily Economy, he worked on the French edition of Voice of America and Morocco economic daily LES ECO, and writes for Forbes Africa, the French edition of Forbes in the United States.

Lominda Afedraru: Science correspondent at the Daily Monitor newspaper, Uganda, part of the Nation Media Group. A journalist since 2004, she also freelances for publications in the United States, UK, Kenya and Nigeria among others and has received fellowships at the World Federation of Science Journalists, Biosciences for Farming in Africa courtesy of University of Cambridge UK and Environmental Journalism Reporting at Sauti University, Tanzania.

Muhammad Amin Ahmed: Senior Correspondent, Daily Dawn in Islamabad, Pakistan. He has been a journalist for more than 40 years. Past experience includes working at the United Nations in New York and Pakistan Press International. He received a UN-21 Award from former U.N. Secretary General Kofi Annan (2003).

Muhammad Irtaza: Special Correspondent with Pakistan’s English daily The Nation at Multan. A 10-year veteran journalist and an alumnus of the Reuters Foundation, he also worked as a reporter with the Evansville Courier and Press in Indiana, United States. He is an ICFJ-WHO Safety 2018 Fellow (Bangkok), Asia Europe Foundation Fellow (Brussels), and a U.S.-Pakistan Professional Partnership in Journalism Program Fellow (Washington). He teaches mass communications at Bahauddin Zakariya University Multan.

Nkechi Isaac: Deputy Editor, Leadership Friday in Nigeria. She is also the head, Science and Technology Desk of the Leadership Group Limited, publishers of LEADERSHIP newspapers headquartered in Abuja, Nigeria. She is a Fellow of Cornell University’s Alliance for Science.

Reaz Ahmad: Executive Editor of the Dhaka Tribune, Bangladesh’s national English newspaper. A journalist for 30 years, he is a Cochran Fellow of the U.S. Department of Agriculture and an adjunct professor of University of Dhaka (DU) and Independent University, Bangladesh.

Rehab Abdalmohsen: Freelance science journalist based in Cairo, Egypt who has covered science, health and environment for 10 years for such websites as the Arabic version of Scientific American, SciDev.net, and The Niles.

Tan Yihong: Executive Deputy Editor-in-Chief, High-Tech & Commercialization Magazine, China. Since 2008, she has written about science particularly agriculture innovation and wheat science. She has attended several Borlaug Global Rust Initiative (BGRI) Technical Workshops. In Beijing, she helped organize a BGRI communication workshop and media outreach.

Tony Iyare: Senior Correspondent, Nigerian Democratic Report. For more than 30 years, he has covered environment, international relations, gender, media and public communication. He has worked as a stringer for The New York Times since 1992, and freelanced for the Paris-based magazine, The African Report and the U.N. Development Programme publication Choices. He was columnist at The Punch and co-authored a book: The 11-Day Siege: Gains and Challenges of Women’s Non-Violent Struggles in Niger Delta.

Nigerian journalist Nkechi Isaac (center) tours a Saskatchewan wheat farm. (Photo: Julie Mollins)
Nigerian journalist Nkechi Isaac (center) tours a Saskatchewan wheat farm. (Photo: Julie Mollins)

The CGIAR Research Program on Wheat (WHEAT) is led by the International Maize and Wheat Improvement Center (CIMMYT), with the International Center for Agricultural Research in the Dry Areas (ICARDA) as a primary research partner. Funding comes from CGIAR, national governments, foundations, development banks and other agencies, including the Australian Centre for International Agricultural Research (ACIAR),  the UK Department for International Development (DFID) and the United States Agency for International Development (USAID).

View from the experimental station in Ciudad ObregĂłn, Sonora, northern Mexico. (Photo: M. Ellis/CIMMYT)

Warmer night temperatures reduce wheat yields in Mexico, scientists say

Written by Rodrigo Ordóñez on . Posted in Features.

As many regions worldwide baked under some of the most persistent heatwaves on record, scientists at a major conference in Canada shared data on the impact of spiraling temperatures on wheat.

In the Sonora desert in northwestern Mexico, nighttime temperatures varied 4.4 degrees Celsius between 1981 and 2018, research from the International Maize and Wheat Improvement Center (CIMMYT) shows. Across the world in Siberia, nighttime temperatures rose 2 degrees Celsius between 1988 and 2015, according to Vladimir Shamanin, a professor at Russia’s Omsk State Agrarian University who conducts research with the Kazakhstan-Siberia Network on Spring Wheat Improvement.

“Although field trials across some of the hottest wheat growing environments worldwide have demonstrated that yield losses are in general associated with an increase in average temperatures, minimum temperatures at night — not maximum temperatures — are actually determining the yield loss,” said Gemma Molero, the wheat physiologist at CIMMYT who conducted the research in Sonora, in collaboration with colleague Ivan Ortiz-Monasterio.

“Of the water taken up by the roots, 95% is lost from leaves via transpiration and from this, an average of 12% of the water is lost during the night. One focus of genetic improvement for yield and water-use efficiency for the plant should be to identify traits for adaptation to higher night temperatures,” Molero said, adding that nocturnal transpiration may lead to reductions of up to 50% of available soil moisture in some regions.

Wheat fields at CIMMYT's experimental station near Ciudad ObregĂłn, Sonora, Mexico. (Photo: M. Ellis/CIMMYT)
Wheat fields at CIMMYT’s experimental station near Ciudad ObregĂłn, Sonora, Mexico. (Photo: M. Ellis/CIMMYT)

Climate challenge

The Intergovernmental Panel on Climate Change (IPCC) reported in October that temperatures may become an average of 1.5 degrees Celsius warmer in the next 11 years. A new IPCC analysis on climate change and land use due for release this week, urges a shift toward reducing meat in diets to help reduce agriculture-related emissions from livestock. Diets could be built around coarse grains, pulses, nuts and seeds instead.

Scientists attending the International Wheat Congress in Saskatoon, the city at the heart of Canada’s western wheat growing province of Saskatchewan, agreed that a major challenge is to develop more nutritious wheat varieties that can produce bigger yields in hotter temperatures.

CIMMYT wheat physiologist Gemma Molero presents at the International Wheat Congress. (Photo: Marcia MacNeil/CIMMYT)
CIMMYT wheat physiologist Gemma Molero presents at the International Wheat Congress. (Photo: Marcia MacNeil/CIMMYT)

As a staple crop, wheat provides 20% of all human calories consumed worldwide. It is the main source of protein for 2.5 billion people in the Global South. Crop system modeler Senthold Asseng, a professor at the University of Florida and a member of the International Wheat Yield Partnership, was involved in an extensive study  in China, India, France, Russia and the United States, which demonstrated that for each degree Celsius in temperature increase, yields decline by 6%, putting food security at risk.

Wheat yields in South Asia could be cut in half due to chronically high temperatures, Molero said. Research conducted by the University of New South Wales, published in Environmental Research Letters also demonstrates that changes in climate accounted for 20 to 49% of yield fluctuations in various crops, including spring wheat. Hot and cold temperature extremes, drought and heavy precipitation accounted for 18 to 4% of the variations.

At CIMMYT, wheat breeders advocate a comprehensive approach that combines conventional, physiological and molecular breeding techniques, as well as good crop management practices that can ameliorate heat shocks. New breeding technologies are making use of wheat landraces and wild grass relatives to add stress adaptive traits into modern wheat – innovative approaches that have led to new heat tolerant varieties being grown by farmers in warmer regions of Pakistan, for example.

More than 800 global experts gathered at the first International Wheat Congress in Saskatoon, Canada, to strategize on ways to meet projected nutritional needs of 60% more people by 2050. (Photo: Matthew Hayes/Cornell University)
More than 800 global experts gathered at the first International Wheat Congress in Saskatoon, Canada, to strategize on ways to meet projected nutritional needs of 60% more people by 2050. (Photo: Matthew Hayes/Cornell University)

Collaborative effort

Matthew Reynolds, a distinguished scientist at CIMMYT, is joint founder of the Heat and Drought Wheat Improvement Consortium (HeDWIC), a coalition of hundreds of scientists and stakeholders from over 30 countries.

“HeDWIC is a pre-breeding program that aims to deliver genetically diverse advanced lines through use of shared germplasm and other technologies,” Reynolds said in Saskatoon. “It’s a knowledge-sharing and training mechanism, and a platform to deliver proofs of concept related to new technologies for adapting wheat to a range of heat and drought stress profiles.”

Aims include reaching agreement across borders and institutions on the most promising research areas to achieve climate resilience, arranging trait research into a rational framework, facilitating translational research and developing a bioinformatics cyber-infrastructure, he said, adding that attracting multi-year funding for international collaborations remains a challenge.

Nitrogen traits

Another area of climate research at CIMMYT involves the development of an affordable alternative to the use of nitrogen fertilizers to reduce planet-warming greenhouse gas emissions. In certain plants, a trait known as biological nitrification inhibition (BNI) allows them to suppress the loss of nitrogen from the soil, improving the efficiency of nitrogen uptake and use by themselves and other plants.

CIMMYT's director general Martin Kropff speaks at a session of the International Wheat Congress. (Photo: Matthew Hayes/Cornell University)
CIMMYT’s director general Martin Kropff speaks at a session of the International Wheat Congress. (Photo: Matthew Hayes/Cornell University)

Scientists with the BNI research consortium, which includes Japan’s International Research Center for Agricultural Sciences (JIRCAS), propose transferring the BNI trait from those plants to critical food and feed crops, such as wheat, sorghum and Brachiaria range grasses.

“Every year, nearly a fifth of the world’s fertilizer is used to grow wheat, yet the crop only uses about 30% of the nitrogen applied, in terms of biomass and harvested grains,” said Victor Kommerell, program manager for the multi-partner CGIAR Research Programs (CRP) on Wheat and Maize led by the International Maize and Wheat Improvement Center.

“BNI has the potential to turn wheat into a highly nitrogen-efficient crop: farmers could save money on fertilizers, and nitrous oxide emissions from wheat farming could be reduced by 30%.”

Excluding changes in land use such as deforestation, annual greenhouse gas emissions from agriculture each year are equivalent to 11% of all emissions from human activities. About 70% of nitrogen applied to crops in fertilizers is either washed away or becomes nitrous oxide, a greenhouse gas 300 times more potent than carbon dioxide, according to Guntur Subbarao, a principal scientist with JIRCAS.

Hans-Joachim Braun,
Director of CIMMYT’s Global Wheat Program and the CGIAR Research Program on Wheat, speaks at the International Wheat Congress. (Photo: Marcia MacNeil/CIMMYT)

Although ruminant livestock are responsible for generating roughly half of all agricultural production emissions, BNI offers potential for reducing overall emissions, said Tim Searchinger, senior fellow at the World Resources Institute and technical director of a new report titled “Creating a Sustainable Food Future: A Menu of Solutions to Feed Nearly 10 Billion People by 2050.”

To exploit this roots-based characteristic, breeders would have to breed this trait into plants, said Searchinger, who presented key findings of the report in Saskatoon, adding that governments and research agencies should increase research funding.

Other climate change mitigation efforts must include revitalizing degraded soils, which affect about a quarter of the planet’s cropland, to help boost crop yields. Conservation agriculture techniques involve retaining crop residues on fields instead of burning and clearing. Direct seeding into soil-with-residue and agroforestry also can play a key role.

CRP Maize Annual Report 2018

Written by Rodrigo Ordóñez on . Posted in Annual reports.

The newly released CGIAR Research Program on Maize (MAIZE) Annual Report 2018 highlights significant development outcomes and impacts through varietal release, scale-up, delivery and adoption of CIMMYT- and IITA-derived climate-resilient and nutritionally enriched maize varieties.

In 2018, national partners released 81 unique CGIAR-derived maize varieties across Africa, Asia and Latin America. Of these varieties 14 were hybrid combinations, showing that regional and multinational seed companies use MAIZE’s improved germplasm to develop and release improved maize hybrids. 20 of the released varieties are nutritionally enriched — provitamin A, quality protein maize (QPM), high-zinc — the result of the MAIZE partnership with the CGIAR Research Program on Agriculture for Nutrition and Health (A4NH; HarvestPlus).

MAIZE and partners have made great strides in 2018 combatting major pest and disease challenges such as maize lethal necrosis (MLN) and the devastating fall armyworm. MAIZE researchers found that sustainable intensification practices in combination with stress-tolerant maize led to higher yield gains during the El Niño year in Southern Africa. Meanwhile, a crop growth modelling study quantified the impact of climate change on maize and found combined drought and heat stress tolerance has a benefit at least twice that of either one alone.

Read the full report online