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Theme: Innovations

Working with smallholders to understand their needs and build on their knowledge, CIMMYT brings the right seeds and inputs to local markets, raises awareness of more productive cropping practices, and works to bring local mechanization and irrigation services based on conservation agriculture practices. CIMMYT helps scale up farmers’ own innovations, and embraces remote sensing, mobile phones and other information technology. These interventions are gender-inclusive, to ensure equitable impacts for all.

Breaking Ground: Hands on experience gives Carolina Camacho insight into farming best practices

TwitterCamachoEL BATAN, Mexico (CIMMYT) – Tending her own crops gives Carolina Camacho insights into the challenges farmers face that she could never have learned in a classroom.

Growing up in the metropolis of Mexico City, the historical and political importance of agriculture was never lost on Camacho, who works as a principal researcher at the International Maize and Wheat Improvement Center (CIMMYT).

“As a teenager, I would debate my sister over the most pressing issue that faced our country, Mexico. For me it was always in agriculture,” Camacho said. “I strongly believe if we are to improve our country, we must improve the lives of our campesinos (smallholder farmers).”

With no knowledge of farming, but with a passion to bring about change, she took to the field, studying crop science at Chapingo University, on the outskirts of the city in the State of Mexico. Having to brave early morning starts, she learned the basics of agriculture, and a love for the genetic diversity of maize.

Mexico, considered the birthplace of maize, is home to a rich diversity of varieties that has evolved over years of domestication by farmers. Camacho was introduced to this diversity firsthand, interning at CIMMYT’s maize germplasm bank as an undergraduate.

Interested in discovering how conserving maize diversity played out in farmers’ fields she gravitated towards an on-farm conservation project in rural Mexico. Working with indigenous farmers, Camacho learned how traditional knowledge and practices relate to environmental management, agricultural production and the diversity of native maize varieties.

After earning a master’s degree in the conservation and utilization of genetic resources, Camacho felt that crop science was isolated from the daily life of farmers. Thus, in a move to study the relationship between humans and plants, she embarked on a multidisciplinary doctoral in the sociology of rural development at Wageningen University in the Netherlands.

While conducting her research, Camacho lived with indigenous farmers in Mexico’s Lacandon rainforest in the state of Chiapas. Alongside local Mayan farmers she cultivated her own milpa – a farming system used by indigenous farmers in Latin America, which typically involves intercropping maize, beans and squash. Her hands-on fieldwork allowed her to study cultivation practices outside the scope of purely agronomic activities, but also as political, social and cultural actions.

“Farming alongside the Tzeltal people, I saw how my own cultivation practices were interwoven with everyday life,” said Camacho. “Farming was influenced by religious ceremonies, health and family affairs as well as political struggles for land. It had to cope, adapt and overcome these challenges.”

Today, these lessons learned guide Camacho as she investigates how agricultural innovations, including drought-tolerant crops, fertilizer and land management approaches can be farmer inclusive and tailored to local contexts as part of CIMMYT’s sustainable intensification strategy for Latin America.

Sustainable intensification aims to enhance the productivity of labor, land and capital. They offer the potential to simultaneously address a number of pressing development objectives, including unlocking the agricultural potential to adapt production systems to climate change, sustainably manage land, soil, nutrient and water resources, improved food and nutrition security, and ultimately reduce rural poverty.

CIMMYT principal researcher Carolina Camacho studies how innovations are promoted and adopted in different regions to aid their smooth delivery to farmers and community members from different genders, ethnicities and ages.
CIMMYT principal researcher Carolina Camacho studies how agricultural innovations are promoted and adopted in different regions to aid their smooth delivery to farmers and community members from different genders, ethnicities and ages. Photo: CIMMYT/ Courtesy of Carolina Camacho

Smallholder farmers, who manage small plots of land and handle limited amounts of productive resources, produce 80 percent of the world’s food. The United Nations calls on these farmers to adopt agricultural innovations in order to sustainably increase food production and help achieve the “Zero Hunger” U.N. Sustainable Development Goal. However, these farmers seldom benefit from new techniques to shore up efforts to meet the goal.

“An agricultural scientist can tell a farmer when and how to plant for optimal results, but they do not farm in a bubble, their practice is affected by the ups and downs of daily life – not only by climate and agronomy but also by social and cultural complexities,” Camacho said.

“One of the biggest challenge is to recognize the heterogeneity of farmers and leave behind the idea of one size solution to their diverse problems and needs,” said Camacho. By understanding a farmer’s lifestyle, including access to resources and information, levels of decision making in the community and the role of agriculture in their livelihood strategy, researchers can best identify complementary farming practices and techniques that not only boost productivity but also improve livelihoods.

“It’s important to think about agricultural innovations as social processes for change in which technologies, like improved seeds or agronomic practices, are only one element,” said Camacho. “It is key that we recognize that changes will not only occur in the farmer’s field but also in the behavior of other actors in the value chain, such as input suppliers, traders, government officials and even researchers.”

Camacho studies how innovations are promoted and adopted in different regions to aid their smooth delivery to farmers and community members from different genders, ethnicities and ages.

When working with indigenous communities, she ensures cultural values of the milpa system are taken into account, thus promoting the agricultural tools and techniques that do not detract from the importance of the traditions associated with the milpa practice.

“The milpa system is a clear example of how agriculture in general and maize in particular contribute to the construction of the cultural identities of indigenous people. We should be aware of the consequences that innovations will have not only for environmental sustainability but also for the sustainability of the Mayan Culture,” she said.

“Let’s not forget, we can’t separate culture from agriculture,” Camacho finished.

 

Camacho studies the process in which researchers promote agricultural innovations and how farmers adopt them through the Sustainable Modernization of Traditional Agriculture (MasAgro) project, supported by Mexico’s Ministry of Agriculture, Livestock, Rural Development, Fisheries and Food (SAGARPA). Together with other researchers, Camacho has documented how MasAgro is promoting innovations in different regions of Mexico by responding to specific regional challenges and opportunities. Currently she is supporting scaling efforts for these innovations by ensuring that they will be sustainable and inclusive.

In the same line of inclusiveness, Camacho is working with two projects in the milpa system. The first one is the Buena Milpa project funded by U.S. Agency for International Development’s Feed the Future program and in collaboration with the Guatemala Agricultural Science and Technology Institute. The second one is the Milpa de Yucatan project sponsored by a private Mexican foundation in Yucatan Peninsula. Both projects promote sustainable intensification innovations in the milpa systems.

 

 

New selection method allows for rapid development of improved maize varieties

Farmers Nuri Bekele, Tefera Tamirat & Melaka Bekele harvest drought tolerant maize in Ethiopia. Photo: P. Lowe/CIMMYT
Farmers Nuri Bekele, Tefera Tamirat & Melaka Bekele harvest drought tolerant maize in Ethiopia. Photo: P. Lowe/CIMMYT

MEXICO CITY (CIMMYT) –  Marker-assisted recurrent selection (MARS) is helping maize breeders develop higher yielding and drought-tolerant improved varieties faster than ever before, according to a recent study from scientists at the International Maize and Wheat Improvement Center (CIMMYT).

“With conventional breeding, it often takes up to 7-8 years for varieties to reach farmers,” said Yoseph Beyene, a CIMMYT maize breeder working with the CGIAR Research Program on Maize (MAIZE) and one of the authors of the study. “With MARS, those varieties take only 5 years to reach farmers, and display greater genetic gain, even under drought conditions”

The study “Improving Maize Grain Yield under Drought Stress and Non-stress Environments in Sub-Saharan Africa using Marker-Assisted Recurrent Selection” found that by using MARS, breeders can develop new maize varieties farmers need faster and cheaper than conventional breeding methods by reducing the breeding cycle, showing scientists which varieties have desired traits at a quicker rate. This study focused on developing improved, drought-tolerant and high-yielding tropical maize varieties for areas such as sub-Saharan Africa that suffer from frequent drought and an unpredictable climate.

“Climate change is changing environments faster than agriculture can naturally adapt,” said Beyene. “It is crucial that farmers are able to access drought-resistant maize varieties as quickly as possible so that they can adapt to these new conditions,” he said.

MARS also dramatically cuts costs by using genotypic data to predict the best maize varieties before planting them. Previously, breeders would have to visually examine and select the best maize varieties every year.

The study found that MARS can be used to improve maize varieties in both drought and optimum environments throughout sub-Saharan Africa, where it is the most important staple food for over 300 million people. The study used MARS to estimate the genetic gain for 10 biparental tropical maize populations and found that overall, the grain yield for the 10 populations increased by 105 kilograms (kg) per hectare per year under well-watered and 51 kg per hectare per year under water-stressed conditions using MARS. The subsequent generations of test crosses were found to have significantly greater grain yields than their parents and commercial checks, suggesting that MARS has excellent potential for increasing genetic gain under both drought and optimum environments in sub-Saharan Africa.

Over 1,000 improved maize lines, including 352 doubled-haploid lines, have been developed from each cycle of the 10 biparental populations used in this study, and tested in multi-location trials. Several hybrids were derived using lines developed through MARS and pedigree methods. The best hybrids from each population are currently under national performance trials and are expected to be released soon for commercialization in sub-Saharan Africa. CIMMYT is one of the first research organizations to apply this technology to maize breeding specifically for the needs of smallholder farmers.

This study was implemented under the Water Efficient Maize for Africa (WEMA) project, supported by the Bill and Melinda Gates Foundation, the Howard G. Buffet Foundation and the U.S. Agency for International Development (USAID).

Read the study “Performance and grain yield stability of maize populations developed using marker-assisted recurrent selection and pedigree selection procedures” published in Euphytica (2016) 208:285–297 for more information.

Closing the circle: Kanwarpal Dhugga works at CIMMYT

kanwarpalBreaking Ground is a regular series featuring staff at CIMMYT

EL BATAN, Mexico (CIMMYT) – Growing up on a small farm in India’s northwest Punjab state, Kanwarpal Dhugga was a young boy when the first Green Revolution wheat varieties arrived in his village. Now stationed in Mexico as Principal Scientist and head of biotechnology for agricultural development at the International Maize and Wheat Improvement Center (CIMMYT), Dhugga has witnessed vast changes in his boyhood community.

“It was tight for families there, living from season to season with no extra money to spend,” Dhugga said, reflecting on the period during the 1960s before new high-yielding, disease resistant wheat varieties began to reshape agricultural potential throughout Asia. “Farmers used to plant a mixture of wheat and chickpeas.  If rains were good, you got good wheat yield; if there was a drought, you got at least chickpeas.”

The use by farmers of the new, high-yielding wheat varieties developed by the late Nobel Peace Prize laureate Norman Borlaug, who was head of the wheat program at CIMMYT headquarters in Mexico, coincided with the introduction of electric power to Dhugga’s area.  Electricity enabled pumping underground water for irrigation, making farming more predictable. Within a couple of years, everyone was growing new, more resilient semi-dwarf wheat varieties and yields had increased substantially.

The community was poor and without many educational resources. Dhugga recalls sitting on the ground at elementary school in India and carrying his books in a satchel along with a burlap gunnysack, which he used as a mat to sit on. Despite challenges, his perseverance and determination eventually took him to Punjab Agricultural University, where he earned a master’s degree in plant breeding, then to the University of California, Riverside for a doctoral degree in botany and plant genetics, and finally for a post-graduate degree at Stanford University, where he worked directly with Peter Ray, renowned biologist and now a Stanford emeritus professor.

“I started in genetics and finished in biochemistry,” Dhugga explained. “Science grew on me and I became so fixated that I couldn’t live without it, and that after I had no clue growing up what I wanted to become in life. The vision extended only as far as the next year.”

From 1996 through 2014, he worked at DuPont-Pioneer, the multinational seed producer, where his work included leading research on expressing high-value industrial polymers in maize grains and soybean seeds, developing in-field screening tools to screen maize hybrids for stalk strength, improving nitrogen use efficiency in maize, and on developing a combined genetic marker x metabolites model for predicting maize grain yield, demonstrating that the combined model was more effective than genetic markers alone.

“I was a developer and supplier of advanced plant genetics for a company that was providing high-quality maize seed to farmers around the world, but I felt like something was missing – a social component,” Dhugga said.

Taking a job at CIMMYT, where the focus is on helping improve food security for poor smallholder farmers in the developing world, satisfied this urge, according to Dhugga. “It felt like completing a circle, given where I came from and the role of CIMMYT in improving farmers’ food security and incomes.”

At CIMMYT, he is leading work to apply a recent technology for what is commonly called “gene editing.” Known as the CRISPR-Cas9 system, it allows researchers to enhance or turn off the expression of “native” genes as well as modify the properties of the translated proteins in crops like maize or wheat more simply and effectively than with other methods, including transgenics.

“To deactivate a gene and thus learn about what it does used to be a major undertaking that took years, and even then you didn’t find some of the things you wanted to,” Dhugga explained. “With the new technology, you can find what you’re looking for in much less time. That’s the main focus of my work right now.”

CIMMYT is collaborating with DuPont-Pioneer to fine map, isolate and validate a major gene in maize for resistance to maize lethal necrosis, which appeared in sub-Saharan Africa in 2011 and has caused major losses to maize crops, decreasing food security and the ability of the smallholder farmers to provide for their families.

“We already know a locus that confers high levels of resistance against the combination of viruses that cause the disease,” he said. “Once we have the specific gene, we can edit it directly in elite maize lines used for hybrid production in Africa, eliminating the need for generations of expensive crosses to get uniform lines with that gene.”

Dhugga greatly respects living systems and, rather than viewing his work as inventing new methods, believes he is drawing out the best potential of nature.

“The biology for these processes is already there in nature; we just need to rediscover and apply it to benefit farmers and ensure food security,” he said.

New maize hybrid shows resistance to stem borers in South Africa

Nontoko Mgudlwa, a smallholder farmer who planted TELA maize for the first time since its release in South Africa. Photo: B.Wawa/CIMMYT
Nontoko Mgudlwa, a smallholder farmer who planted TELA maize for the first time since its release in South Africa. Photo: B.Wawa/CIMMYT

Eastern Cape, SOUTH AFRICA (CIMMYT) – Smallholder farmers in South Africa can now access and grow new maize varieties with transgenic resistance to stem borers, the most damaging insect pest of maize.

Partners in Water Efficient Maize for Africa (WEMA) – a public-private crop breeding initiative that helps farmers manage the risk of drought and stem borers infestation in Africa –developed the genetically modified maize seed branded as “TELA,” which has been released and licensed royalty-free to South Africa seed companies for sale to farmers at affordable prices.

TELA derived from a Latin word Tutela meaning “protection”contains a gene from Bacillus thurigiensis (Bt) that helps the maize to resist damage from major stem borers to give farmers better yields. Five seed companies – Capstone, Jermat, Monsanto, SeedCo and Klein Karoo – are marketing the seed to smallholders.

The WEMA project is helping smallholder farmers face two of their chief menaces through the new insect protected and drought tolerant maize hybrids. Led by the African Agricultural Technology Foundation (AATF), WEMA brings together public and private partners including the International Maize and Wheat Improvement Center (CIMMYT), Monsanto and the national agricultural research organizations of Kenya, Mozambique, South Africa, Tanzania and Uganda.

Stem borers affect maize production on about 30 million hectares  in developing countries, feeding aggressively on leaves, stems and ears and significantly reducing grain yield.

In eastern and southern Africa, two stem borers – Busseola fusca and Chilo partellus – are the most damaging pests. In South Africa, reported annual yield losses in maize range between 10 and 75 percent. Yield losses in maize and sorghum as a result of Chilo partellus have exceeded 50 percent.

During the last 2016 planting season, Nontoko Mgudlwa was one among the selected smallholders to host a trial for TELA maize hybrid.

“I received a small packet of TELA from our extension officer, and planted it in this small portion of land on December 9, 2016,” said Mgudlwa. “The land was not enough to add my indigenous maize, but I’m very happy to see how the crop is performing despite the very visible attack on the border crop by stem borers,” continued Mgudlwa, pointing out the severely damaged border crops that were planted with refuge seed as a control group alongside TELA.

TELA maize (left) in Mgudlwa’s farm showed good resistance to stem borer infestation, whereas plants in the refuge plot of non-TELA maize on the same farm show the shot holes typical of stem borer feeding. Photo: B.Wawa/CIMMYT
TELA maize (left) in Mgudlwa’s farm showed good resistance to stem borer infestation, whereas plants in the refuge plot of non-TELA maize on the same farm show the shot holes typical of stem borer feeding. Photo: B.Wawa/CIMMYT

The farmers who hosted trials were given a 2 kilogram packet of TELA maize as part of demonstrations to raise awareness about the variety and help farmers see its performance. The packet also contained a small pack of seed of non-Bt maize called “refuge” seed to sow at the border of the main plot. This non-Bt maize allows the survival of susceptible borers and thus delays the emergence or spread in borer populations of individuals able to overcome the Bt maize resistance.

Mgudlwa’s home in Nqatu Great Palace suffers frequent borer infestations, which most farmers control using insecticides. As part of the trial, Mgudlwa did not use chemicals despite a heavy invasion of the pests on her farm and evidence of significant damage in the refuge crop.

“It is critically important for farmers to understand the requirement and procedure of planting TELA maize and the refuge seed found in a small bag inside the TELA seed pack,” said Kingston Mashagaidze, WEMA project coordinator in South Africa. “The extension officers have been trained on how to plant TELA and the refuge seed, so they can help farmers to plant the crop the right way.”

Recently, Mozambique joined Kenya, Tanzania and Uganda to successfully conduct confined field trials (CFT) for genetically modified maize. The CFTs are important to generate data on the performance of the Bt maize and commercial conventional hybrids infested by stem borers to support the application for the release of TELA hybrids in the remaining four WEMA countries.

Bangladesh urges $500 million in funds to intensify surface water irrigation

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Designed by Bose Zhou/CIMMYT

EL BATAN, Mexico (CIMMYT) – Most current food security projections show that staple crop production must double by 2050 to keep up with global need, which will continue to expand due to population growth and changing dietary demands.

In South Asia, where population pressures pose a significant food security challenge, yields of major cereal crops have not changed dramatically since the Green Revolution of the 1970s and 1980s. This has prompted regional governments and development practitioners to focus instead on efforts to expand double cropping – the practice of growing at least two crops per year on the same piece of land – in order to boost productivity on an annual basis.

This approach is in line with sustainable intensification techniques, which aim to boost production, rather than encroach on natural ecosystems and harm the environment by expanding farmland into limited natural areas.

Scientists with the International Maize and Wheat Improvement Center (CIMMYT) are researching how best to increase double cropping in Bangladesh, which, as South Asia’s most densely populated country, poses unique food security challenges.

In the northwest of the country, farmers already rotate at least two crops in the same field each year using groundwater irrigation to overcome drought risks during the dry winter season.

“Most development initiatives favor the use of groundwater resources for irrigation, although in Bangladesh, ground water extraction can result in high energy costs and in some areas can present a health risk due to natural arsenic contamination of groundwater,” said Timothy Krupnik, systems agronomist at CIMMYT.

“In support of government programs recommending the conjunctive use of surface water as an irrigation alternative, we investigated the available land in Bangladesh that could be reliably cropped to wheat, maize, or rice in double cropping patterns,” Krupnik said, adding that the effort resulted in a new online geospatial tool that can be used by water resource planners and policymakers to target the use of surface water in support of sustainable intensification. It helps identify surface water irrigation resources and land area most suited for double cropping and sustainable intensification.

“Using satellite data for irrigation technology targeting in Bangladesh enabled us to identify areas that are under low input and output crop production in a region with abundant surface water,” said Urs Schulthess, CIMMYT’s remote sensing scientist involved in developing the geospatial tool. “This is an example of sustainable intensification that does not deplete water resources.”

Instead of extracting water from underground aquifers, surface water irrigation involves deploying water through low-lift irrigation pumps and canal distribution networks managed by water sellers who direct water to farmers’ fields. Although Bangladesh is likely to remain largely reliant on groundwater irrigation, use of available surface water presents a low-energy and low-carbon emissions alternative in select areas of the country, Krupnik said.

The research conducted by scientists funded by the CIMMYT-led Cereal Systems Initiative for South Asia (CSISA) project, provides initial evidence to support a government of Bangladesh policy aimed at stimulating a $500 million investment in development aid from donors to help farmers transition from rice-fallow or rainfed systems to surface water irrigation and double cropping. The funds form part of an overall request for investment of over $7 billion to support agricultural development in southern Bangladesh.

After mapping rivers and freshwater canals in southern Bangladesh with the new tool, the scientists conservatively estimate that at least 20,800 of fallow and 103,000 hectares of rainfed cropland could be intensified through surface water irrigation to substantially increase cereal crop production through double cropping. These figures account for land set into non-crop reserves to limit risks of nitrate or phosphorous contamination of rivers and canals.

Groundwater irrigation techniques have been difficult to implement in the south of the country due to high energy pumping costs for groundwater, and additional challenges posed by saline shallow water tables. Currently, about 1.7 million farming households in Bangladesh simply leave cropland fallow and unproductive after the monsoon season, according to the World Bank.

By integrating the use of groundwater with lower-cost surface water irrigation, farmers could benefit from increased cropping intensity.

To evaluate potential land productivity resulting from conversion from fallow or rainfed crops to surface water irrigated maize, wheat, and rice, CIMMYT scientists measured yields produced by farmers on their own farms and in farmer-managed demonstrations implemented by the CSISA project.

The three crops are among the most important cereals grown in Bangladesh for food security and income.

Based on analysis, CIMMYT’s scientists estimate that if 25 to 75 percent of fallow or low-intensity land is converted to irrigated maize, production could increase from 10 to 14 percent or from 29 to 42 percent, respectively. Conversion to wheat could increase production from 9 percent to 10 percent or from 26 percent to 31 percent. On the other hand, rice is projected to increase only about 3 percent under such conditions.

Overall, increasing maize and wheat production through double cropping could generate revenues from $36 to $108 million each year for farmers, Krupnik said.

Breaking Ground: Xuecai Zhang prepares future generation of crop breeders

TwitterBG8Breaking Ground is a regular series featuring staff at CIMMYT

EL BATAN (CIMMYT) — Xuecai Zhang wants to merge traditional maize breeding methods with new software and other tools to help improve farmers’ yields faster than ever.

“In the next three decades we need to increase agricultural production by 70 percent to meet projected food demand,” said Zhang, a maize genomic selection breeder at the International Maize and Wheat Improvement Center (CIMMYT). “However, crop yields, while improving, are not increasing quickly enough to meet this challenge. We must explore new methods and technologies that can speed up our crop breeding processes if we hope to feed a world with over 2.3 billion more people by 2050.”

Growing up in Henan province, China, Zhang’s mother was a teacher who instilled a love of science in him from a young age.

“I loved exploring outside and seeing how plants grew — I always wanted to know how they worked,” said Zhang. “Maize was naturally interesting to me because it’s the second most grown crop in Henan, and is becoming a very important crop in China overall.”

Zhang first arrived at CIMMYT in 2009 while completing a doctorate in applied quantitative genetics. He subsequently returned as a postdoctoral fellow in 2011 to undertake molecular breeding and coordinate CIMMYT’s maize genomic selection program.

Since his return, he has focused mainly on helping breeders and statisticians work together to create new tools that can help accelerate the breeding process through genomic selection.

“It’s crucial that as breeders, we’re able to use genomic selection in our work,” Zhang said. “Not only does it speed up the breeding process to deliver better, faster results to farmers in the field, applied well it’s also a more cost-effective option.”

Conventional plant breeding is dependent on a researcher going into the field, observing the characteristics of a plant based on how its genotype interacts with the environment, then painstakingly selecting and combining those materials that show such favorable traits such as high yield or drought resistance.  This process is repeated again and again to develop new varieties.

Genomic selection adds DNA markers to the breeder’s toolkit. After initial field evaluation breeders are able to use DNA markers and advanced computing applications to select the best plants and predict the best combinations of plants without having to wait to evaluate every generation in the field. This speeds up the development of new varieties as more cycles of selection and recombination can be conducted in a year compared with field selection alone.

The cost of hiring a human to go and collect phenotypic data for conventional breeding is increasing, while conversely the costs associated with genomic selection are getting lower as genotyping and computing technology becomes more affordable, according to Zhang.

“Breeders need to think about where the technology is pushing our field,” he said. “They will increasingly have to be versed statisticians and computer scientists to effectively apply genomic selection to their work, and I want to help ensure they have the skills and tools to make the most of the technology.”

Zhang has helped demonstrate to breeders in Latin America, Africa and Asia of the value of genomic selection by showing that the technique can improve the prediction accuracy of successful varieties in comparison to conventional breeding. He also credits joint efforts like the GOBII project, a large-scale public-sector effort supported by the Bill & Melinda Gates Foundation, to apply genomic selection techniques to crop breeding programs across the developing world, as key towards curating the necessary data for genomic breeding programs.

“In the future, I hope to continue to help build better tools for breeders to move towards genomic selection,” Zhang said. “I chose to breed maize because of the potential impact it has to help smallholder farmers globally. Compared with other crops the yield potential of maize is very high, so I want to ensure we are using the best resources available that will help maize reach its full potential.”

Breaking Ground: Cesar Petroli on data-driven use of maize genetic diversity

TwitterBG5Breaking Ground is a regular series featuring staff at CIMMYT

EL BATAN, Mexico (CIMMYT) – Access to genetic data can revolutionize research partnerships and lead to major benefits for crop breeders aiming to help smallholder farmers boost yields, according to Argentinian geneticist Cesar Petroli.

Hailing from Reconquista in Santa Fe Province, Petroli now works for the MasAgro program at the International Maize and Wheat Improvement Center (CIMMYT) and is funded by Mexico’s Ministry of Agriculture (SAGARPA). He first became curious about genetics in the mid-1990s when it was a relatively new field in Argentina and the National University of Misiones offered the only bachelor’s degree in the country. Petroli initially focused on cattle and sheep genetics, which gave him his first introduction to molecular markers, which shed light on characteristics of the organism.

His interest in data and plant genetics took root while he was a student. While completing his doctoral degree at the University of Brasilia in partnership with EMBRAPA, Brazil’s agricultural research body, Petroli began to work on the eucalyptus tree with Diversity Arrays Technology (DArT), an Australian enterprise specializing in developing technologies for whole genome profiling.

At that time, CIMMYT wanted to create what was subsequently to become the Genetic Analysis Service for Agriculture (SAGA) using a platform based on the DArT method. Petroli was the perfect fit. Not only did he bring expertise in sequencing and low-cost DNA fingerprinting, he also brought experience of application of large amounts of data in research; in particular, his experience in eucalyptus.

At the heart of operations at the SAGA laboratory is the Illumina HiSeq 2500 sequencing system, one of only three in Mexico, where CIMMYT is headquartered.  Petroli and his team have the capacity to determine the genetic make-up up to 2,500 maize samples per week for both CIMMYT and its partners, generating vast quantities of data in the process.

“We determine the genetic make-up maize and wheat varieties and collections,” Petroli said. “This can help maize breeders to identify patterns in the DNA which are associated with characteristics such as drought and heat tolerance. These patterns or molecular signposts can then be used to help select the best materials for breeding,” he added, explaining that heat and drought resistant maize and wheat varieties not only help present-day farmers, but could also mitigate potential future risks to global food security from the impacts of climate change.

The data generated when fingerprinting thousands of maize and wheat samples provide opportunities for scientific exploration and synergies; while one team may be exploring heat and drought tolerance, another team can use the same DNA fingerprint data to explore other characteristics such as disease tolerance.

“Sharing data for use by interested breeders broadens collaboration and maximizes benefits to smallholder farmers,” Petroli said, describing his enthusiasm for making data publicly available. “Accessible data increases the impact of our research and allows the global public to benefit from the wealth of knowledge we generate.”

In the first six years of the MasAgro program, more than 2 billion genotypic data have been made available in the Germinate and Dataverse platforms. Petroli’s work forms part of bigger efforts at CIMMYT to study and characterize genetic diversity for use in breeding programs.

CIMMYT scientist cautions against new threats from wheat rust diseases

David Hodson, senior scientist with CIMMYT, trains South Asian wheat scientists on the use of handheld surveillance and monitoring devices. Hodson directs the rusttracker.org global wheat rust monitoring system for the Delivering Genetic Gain in Wheat (DGGW) project. Credit: CORNELL/Linda McCandless

EL BATAN, Mexico (CIMMYT) – Scientists are concerned over the proliferation of highly virulent fungal wheat diseases, including two new races of yellow rust – one in Europe and North Africa, the other taking hold in East Africa and Central Asia – and a new race of stem rust emerging in Europe.

The collaborative Global Rust Reference Center (GRRC) hosted by Aarhus University in Denmark and including the International Maize and Wheat Improvement Center (CIMMYT) and the International Center for Agricultural Research in the Dry Areas (ICARDA), was instrumental in identifying the new races of yellow and stem rust.

A strategic tool developed by David Hodson, a senior scientist with CIMMYT plays a key role in monitoring the movement of wheat-rust pathogens, helping farmers combat the disease in time to save crops and prevent food insecurity.

“We see an alarming increase in severe disease, more disease diversity and rapid spread,” said Hodson, who invented the Rust Tracker field surveillance tool.

Last year, the Italian island of Sicily was badly hit by a strain of wheat stem rust – an event not seen in Europe since the 1950s, following concerted efforts by wheat breeders to eliminate it.

Stem rust appears as a reddish-brown fungal build-up on wheat stems or leaves, stunting and weakening plants, preventing kernels from forming, leading to shriveled grain and potential crop losses of 50 to 100 percent.

Dispersal modeling, undertaken by the University of Cambridge and the UK Met Office, which forecasts weather and climate change, indicates that spores from the Sicilian outbreak could potentially have spread within the Mediterranean wheat growing region, but scientists are unsure whether they will successfully over-winter, surviving and proliferating, according to a recent story in the journal Nature.

EARLY WARNING

“Several factors may be influencing the changes and rapid spread: increased travel and trade; increasing pathogen populations; more uniform cropping systems and also climate change, but the rapid changes we are observing highlight the need for an enhanced early-warning system,” said Hodson, a member of an international team of scientists collaborating under the Delivering Genetic Gain in Wheat (DGGW) project administered by Cornell University through the Borlaug Global Rust Initiative (BGRI).

Scientists engaged with the major four-year international project – which has a budget of $34.5 million due to grants equalling $24 million from the Bill & Melinda Gates Foundation and a recent $10.5 million grant from UK Aid (Britain’s Department for International Development, or DFID) – use comparative genomics and big data to develop new wheat varieties. The aim is to help governments provide smallholder farmers in the developing world with seeds incorporating resilience to environmental stresses and diseases through local entrepreneurial distributors.

“The sooner farmers are notified of a potential rust outbreak, the better chance they have to save their crops through fungicides or by planting resilient wheat varieties,” Hodson said.

“It’s a constant challenge. We’re always on the lookout for new diseases and variants on old diseases to put the wheels in motion to aid governments who can distribute seeds bred specifically to outsmart rusts.”

However, the long-term sustainability of these vital disease-monitoring systems is uncertain. Despite the significant investments, challenges remain, Hodson said.

“It’s worrying that just as stem rust is re-appearing in Europe we’re at risk of losing the only stem rust pathotyping capacity in Europe at GRRC, due to a funding shortfall. Given the threats and changes we are observing, there really is a critical need for a long-term strategy to address major crop diseases.”

TRACKER ORIGINS

The online Rust Tracker was originally conceived as a tool to battle stem rust, including the lethal Ug99 race, which since its discovery in 1998 has spread from Uganda into the Middle East and is now found in 13 countries. If Ug99 takes hold in a field it can completely wipe out a farmer’s crop. In developing countries, farmers have more difficulty accessing and affording fungicides, which can potentially save a crop.

Under the Durable Rust Resistance in Wheat project, the predecessor to the DGGW project, BGRI-affiliated scientists aimed to prevent the spread of Ug99 into the major global breadbaskets of China and India. So far, they have succeeded in keeping it in check and raising awareness among governments and farmers of its potentially devastating impact.

“Researchers and farmers are connected in the global village,” Hodson said. “Plant pathogens know no borders. We must leave no stone unturned in our efforts to understand the dynamics of wheat rusts, how they’re changing, where they’re spreading and why. If wheat scientists can help prevent a food crisis, we’re doing our job to help maintain political and economic stability in the world.”

Breaking Ground: Caixia Lan on identifying building blocks for rust resistant wheat

CIMMYT scientist Caixia Lan. Photo: Courtesy of Caixia Lan

Breaking Ground is a regular series featuring staff at CIMMYT

EL BATAN, Mexico (CIMMYT) – Support for research into breeding crops resistant to wheat rust is essential to manage the spread of the deadly disease, which has caused billions of dollars of yield losses globally in recent years, said Caixia Lan, a wheat rust expert at the International Maize and Wheat Improvement Center (CIMMYT).

Rust disease has historically been a menace to wheat production worldwide. Although agricultural scientists manage the disease by breeding wheat varieties with rust resistant traits, the emergence of new races hinders progress and demands continued research, said the scientist.

With outbreaks of new strands reported in Europe, Africa and Central Asia, wheat rust presents an intensifying threat to the over 1 billion people in the developing world who rely on the crop as a source of food and for their livelihoods.

One of the most recent rust races, Ug99, was detected in 1998 and has since spread across 13 countries, alone causing crop losses of $3 billion in Africa, the Middle East and South Asia, said Lan.

Working with CIMMYT’s Global Wheat Program Lan is identifying and mapping adult-plant resistance genes to different races of rust (leaf, stripe, and stem) in bread and durum wheat and transferring them into new varieties that help secure farmer’s production.

Growing up in an area dependent on agriculture in rural China, Lan knows all too well the impact crop disease and natural disaster has on family food security and livelihoods. The struggles of smallholder farmers to feed and support their families motivated her to pursue a career in agriculture for development, but it was not until university that she became inspired by the improvements made to crop yield through genetic manipulation and breeding, she said.

After completing her doctoral degree at the Chinese Academy of Agricultural Sciences, and working as a wheat molecular breeding lecturer at Huazhong Agricultural University, Lan was named the Borlaug Global Rust Initiative Women in Technology Early Career Winner in 2011. Lan joined CIMMYT in a post-doctoral position and currently works as a scientist to improve wheat’s resistance to rust.

Rust is a fungal disease that uses wheat plants as a host, sucking vital nutrients and sugars from the plant leaving it to wither and die. Without intervention, wheat rust spreads due to the release of billions of spores, which travel by wind to other plants, crops, regions or countries. Spores have the potential to start new infection, ravage crops and threaten global food security.

The science behind building genetic resistance takes two forms known as major (or race-specific) genes and adult-plant resistance based on minor genes. Major resistance genes protect the wheat plants from infection by specific strains of rust. While adult plant resistance, Lan’s area of specialization, stunts the pathogen by reducing the infection frequency and limiting its nutrient intake from the host wheat plant. Some of the longer-lasting adult-plant resistance genes have been shown to provide protection against multiple diseases for decades and have not succumbed to a mutated strain of rust so far.

Replacing wheat crops for varieties bred with several rust-resistant genes acts as a safeguard for occasions when the pathogen mutates to overcome one resistant gene as the others continue the defense, Lan said.

Lan has identified a number of rust resistant genes in CIMMYT germplasm and developed molecular markers, which are fragments of DNA associated with a specific location in the genome. However, as new races of the disease emerge and old ones continue to spread, research identifying durable and multiple rust resistant genes and breeding them into crops is of high importance, she said.

Breaking Ground: Bhoja Basnet sets sights on increasing wheat yield potential through hybrid seeds

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Bhoja Raj Basnet joined CIMMYT as a postdoctoral fellow working in the bread wheat improvement program in 2012. Photo: A. Cortes/CIMMYT

Breaking Ground is a regular series featuring staff at CIMMYT

MEXICO CITY (CIMMYT) – Scientist Bhoja Raj Basnet knows first hand what it is like to be a smallholder farmer.

Basnet’s earliest memories were formed on a one-acre subsistence farm in Jhapa, in southeastern Nepal, a fertile area in a country where the livelihoods of nearly 65 percent of people depend on agriculture.

The tiny farm provided the foundation for a journey that led ultimately to a doctoral degree in the United States and a career as a wheat breeder in Mexico at the International Maize and Wheat Improvement Center (CIMMYT).

Wheat plays a major role in Nepal’s agricultural landscape. It is the country’s third largest crop, cultivated on about 750,000 hectares of arable land each year with an average yield of 2.5 tons per hectare.  Above wheat, farmers favor only rice and maize.

“I grew up playing with the plants and soil on my family’s farm and before I entered high school I knew I wanted to pursue a career in agricultural science.” Basnet explained. “As I got older I started to realize the importance of agriculture and how agriculture can really shape a child’s health and future. This is what really pushed me to pursue my career.”

Basnet went on to earn his master and doctoral degrees in plant breeding. After graduation in 2012 from Texas A&M University, Basnet joined CIMMYT as a postdoctoral fellow working in the bread wheat improvement program.

In 2014, Basnet began leading a project conducting research into hybrid wheat in collaboration with Syngenta, which involves researching and developing tools and technology for developing commercially viable hybrid CIMMYT wheat varieties.

Hybrid wheat is created when a breeder intentionally crosses two genetically distinct and stable wheat lines to produce an offspring that combines the best traits of the parents. The process of developing a hybrid can take years, as traits are carefully chosen to achieve desired characteristics, such as increased grain yield or stress tolerance.

The principle behind hybrid varieties is exploitation of heterosis, the superiority of the hybrid offspring over its parent varieties. This is a biological phenomenon observed in almost all living organisms. However, the magnitude of “heterosis” varies significantly based on several biological and environmental factors.

“Hybrid wheat has always fascinated me,” Basnet said, adding, “I really want to see the end results and to see this work succeed.”

Hybrid wheat varieties have proven to be tricky. In fact, CIMMYT’s first attempt to develop hybrid wheat occurred in the 1960s and despite stops and starts over the years, has been ongoing since 2010.

Increasing investment and long-term funding commitments are a key prerequisite to achieving success in crop improvement, especially in breeding, Basnet said. Unlike traditional wheat variety development, successful research into hybrid wheat varieties depends largely on the willingness and active engagement of private sectors into research and seed businesses.

Basnet is working to develop a hybrid wheat foundation at CIMMYT by using new technology and existing research on hybrids. This hybrid wheat foundation will create genetic diversity within wheat to increase genetic gains and develop tools that can produce large amounts of hybrid seed.

“Currently less than one percent of wheat crops globally are hybrid wheat,” Basnet explained. “We need to continue with this research, as hybrid crops could lead to 15 to 20 percent greater yield potential and in particular higher stability, a very important trait with climate change.”

New study reveals how controlling wheat hormones can cool hot crops

MEXICO CITY, Mexico (CIMMYT) — Reductions of spike-ethylene, a plant-aging hormone, could increase wheat yields by 10 to 15 percent in warm locations, according to a recent study published in New Phytologist journal.

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Ravi Valluru observes wheat trials in the field at CIMMYT El Batán.

Ethylene is usually produced by plants at different developmental stages and can cause a wide range of negative effects on plant growth and development.

When hot weather hits a wheat field an increase in ethylene levels can lessen the amount of grains produced on ears or spikes by limiting the export of carbohydrates to pollen development.

“It was important to understand how different wheat varieties show yield responses to both ethylene gradients and ethylene inhibitors,” explained Ravi Valluru, wheat physiologist at the International Maize and Wheat Improvement Center (CIMMYT), adding that the research was primarily done in northwestern Mexico using both landraces and modern lines under heat-stressed field conditions.

Valluru is part of a collaborative team of scientists from CIMMYT and Britain’s Lancaster University investigating ways to reduce ethylene production in wheat plants as a means to improve yields in hot weather conditions.

The team treated a diverse set of wheat varieties with silver nitrate, an inorganic compound traditionally used for medicinal and other purposes and that has been shown to control ethylene levels in plants.

“We have known for a long time that ethylene has negative effects on crop yields, but efforts have been meager so far to bring this knowledge into breeding programs,” Valluru said. “It’s very exciting that CIMMYT has initiated the important steps toward bringing the ethylene story to wheat breeding through this project.”

The study has revealed that different wheat varieties responded differently to ethylene and ethylene inhibitors. That’s good news, because breeders can then select the appropriate lines for growing in warmer climates to incorporate into breeding programs.

According to Valluru, breeders have selected for high yield over many years that has inadvertently lowered ethylene expression in modern, improved varieties.

“Being a gas, ethylene is a kind of ‘ethereal’ plant growth regulator, but when produced at higher levels, has a major impact on grain setting and root growth,” said Matthew Reynolds, head of the wheat physiology team at CIMMYT and co-author of the study. “Understanding it and determining its genetic bases are significant steps forward, and we can expect that this knowledge will be applied in breeding.”

Crop sensors sharpen nitrogen management for wheat in Pakistan

Wheat researcher with Green Seeker at Wheat Research Institute Sakrand, Sind Province, Pakistan. Photo: Sarfraz Ahmed
Wheat researcher with Green Seeker at Wheat Research Institute Sakrand, Sind Province, Pakistan. Photo: Sarfraz Ahmed

ISLAMABAD (CIMMYT) – Pakistani and the International Maize and Wheat Improvement Center (CIMMYT) scientists are working with wheat farmers to test and promote precision agriculture technology that allows the farmers to save money, maintain high yields and reduce the environmentally harmful overuse of nitrogen fertilizer.

Wheat is planted on more than 9 million hectares in Pakistan each year. Of this, 85 percent is grown under irrigation in farming systems that include several crops.

Farmers may apply nearly 190 kilograms of nitrogen fertilizer per hectare of wheat, placing a third of this when they sow and the remainder in one-to-several partial applications during the crop cycle. Often, the plants fail to take up and use all of the fertilizer applied. More precise management of crop nutrients could increase farmers’ profits by saving fertilizer with no loss of yield, as well as reducing the presence of excess nitrogen that turns into greenhouse gases.

Precision nutrient management means applying the right source of plant nutrients at the right rate, at the right time and in the right place. CIMMYT is working across the globe to create new technologies that are locally adapted to help farmers apply the most precise dosage of fertilizer possible at the right time, so it is taken up and used most effectively by the crop.

CIMMYT and the Borlaug Institute for South Asia (BISA) have developed the application “urea calculator” for cell phones. In this process, a Green Seeker handheld crop sensor quickly assesses crop vigor and provides readings that are used by the urea calculator to furnish an optimal recommendation on the amount of nitrogen fertilizer the wheat crop needs.

National partners observe the Green Seeker at work at Rice Research Institute, Kala Shah Kaku, and Punjab, Pakistan. Photo: Abdul Khalique
National partners observe the Green Seeker at work at Rice Research Institute, Kala Shah Kaku, and Punjab, Pakistan. Photo: Abdul Khalique

Tests with the crop sensor/calculator combination on more than 35 farmer fields during 2016 in Pakistan results showed that 35 kilograms of nitrogen per hectare could be saved without any loss in grain yield. This technology is being evaluated and demonstrated in Pakistan as part of the CIMMYT-led Agricultural Innovation Program (AIP), supported by the United States Agency for International Development in collaboration with Pakistan partners.

CIMMYT recently began work in four provinces of Pakistan, providing Green Seekers and training to AIP research, extension and private partners. Fifty-five specialists in all took part in training events held at the Wheat Research Institute Sakrand, Sind Province; the Rice Research Institute KSK, Punjab Province; and the Model Farm Service Center, Nowshera, Khyber Pakhtunkhwa Province.

Training and new partnerships will help national partners to demonstrate and disseminate sustainable farming practices to wheat farmers throughout Pakistan.

Breaking Ground: Carolina Sansaloni explores and unlocks genetic potential from wheat genebanks

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Breaking Ground is a regular series featuring staff at CIMMYT

EL BATAN, Mexico (CIMMYT) – Carolina Sansaloni’s passion for genetics began when she was at Universidad de Misiones in Posadas, Misiones, Argentina, an interest that grew as she moved on to receive her master’s and doctoral degrees in molecular biology at Universidad de Brasilia in Brazil.

While completing her doctorate degree, Sansaloni travelled to Canberra, Australia to research the genomic structure of the eucalyptus tree at Diversity Arrays Technology (DArT), learning the ins and outs of sequencing technology.

In 2012, the International Maize and Wheat Improvement Center (CIMMYT) wanted to introduce the DArT genotyping technologies to Mexico to serve the needs of the Mexican maize and wheat research communities, and once Sansaloni finished her doctoral degree, she was an obvious choice to lead this initiative.

Working under the MasAgro Biodiversidad project in partnership with DArT, INIFAP and CIMMYT, Sansaloni helped to build the Genetic Analysis Service for Agriculture (SAGA in Spanish) from the ground up.

The service, managed by the CIMMYT-based Seeds of Discovery (SeeD) initiative, brings cutting edge genotyping capacity and genetic analysis capability to Mexico. The facility provides unique insights into the genetic variation of wheat and maize at a “sequence level.” Use of the vast quantities of data generated help understand genetic control of characteristics evaluated at a plant or crop level for example, height variations among wheat varieties.

SAGA’s services are available for all CIMMYT scientists, universities, national agriculture research programs and private companies. Worldwide, few other platforms produce this kind of data and most are inaccessible to scientists working at publicly funded institutions because their economic or logistics difficulties.

“When it comes to genotyping technology, it doesn’t matter what type of organism you are working with. It could be wheat, eucalyptus or chicken –  the machine will work the same way,” explained Sansaloni.

Sansaloni has also been focusing her time on the wheat Global Diversity Analysis, which characterizes and analyzes seeds in genebanks at both CIMMYT and the International Center for Agricultural Research in Dry Areas (ICARDA). Her team has characterized approximately 100,000 wheat accessions including 40 percent of the CIMMYT genebank and almost 100 percent of the ICARDA genebank wheat collection. This is an incredible and unique resource for wheat scientists providing a genetic framework to facilitate selection of the most relevant accessions for breeding.

“Currently only five to eight percent of materials in the genebank are being used in the breeding programs,” Sansaloni said. “The Global Diversity Analysis could have huge impacts on the future of wheat yields. It is like discovering the pieces of a puzzle, and then beginning to understand how these pieces can fit together to build excellent varieties of wheat.”

Sansaloni’s goal is to combine information from CIMMYT and ICARDA, making the information accessible to the entire wheat community and eventually enhancing breeding programs across the globe.

“Working at CIMMYT has been an invaluable experience,” Sansaloni said. “I’ve had the opportunity to work and collaborate with so many different people, and it’s brought me from the laboratory into the wheat fields, which really brings me closer to my work.”

SeeD is a joint initiative of CIMMYT and the Mexican Ministry of Agriculture (SAGARPA) through the MasAgro project. SeeD receives additional funding from the CGIAR Research Programs on Maize (MAIZE CRP) and Wheat (WHEAT CRP), and from the UK’s Biotechnology and Biological Sciences Research Council (BBSRC).

Breaking Ground: Scientist Deepmala Sehgal on the trail of novel wheat diversity

Breaking Ground is a regular series featuring staff at CIMMYT

Deepmala Sehgal, wheat geneticist and molecular breeder at CIMMYT. Photo: M. Listman/CIMMYT
Deepmala Sehgal, wheat geneticist and molecular breeder at CIMMYT. Photo: M. Listman/CIMMYT

EL BATAN, Mexico (CIMMYT) — Molecular analysis research by Deepmala Sehgal, a wheat geneticist and molecular breeder who joined the International Maize and Wheat Improvement Center (CIMMYT) as an associate scientist in 2013, has led to the discovery of novel genes for yield, disease resistance and climate resilience in previously little-used wheat genetic resources.

But getting to the point of applying cutting-edge DNA marker technology to support CIMMYT wheat breeding has involved a few dramatic moves for the New Delhi native, who studied botany throughout middle school and university. “I loved science and chose plant science, because I enjoyed the field trips and didn’t like dissecting animals,” Sehgal said, explaining her choice of profession.

It wasn’t until she was studying for her Ph.D. at Delhi University in 2008 that she first used molecular markers, which are DNA segments near genes for traits of interest, like drought tolerance, and which can help breeders to develop improved crop varieties that feature those traits.

“For my thesis, I used molecular markers in a very basic way to analyze the diversity of safflower species that the U.S. Department of Agriculture had in its gene bank but didn’t know how to classify. I found a place for some and, for several, had to establish completely new subspecies,” Sehgal said.

Later, as a post-doctoral fellow at the University of Aberystwyth in Britain, Sehgal used an approach known as fine mapping of quantitative trait loci (QTL), for drought tolerance in pearl millet. “The aim of fine mapping is to get shorter QTL markers that are nearer to the actual gene involved,” she explained, adding that this makes it easier to use the markers for breeding.

As it turned out, Sehgal’s growing proficiency in molecular marker research for crops made her suited to work as a wheat geneticist at CIMMYT.

“By 2013, CIMMYT had generated a huge volume of new data through genotyping-by-sequencing research, but those data needed to be analyzed using an approach called “association mapping,” to identify markers that breeders could use to select for specific traits. My experience handling such data and working with drought stress gave me an in with CIMMYT.”

Based at CIMMYT’s Mexico headquarters, Sehgal currently devotes 70 percent of her time to work for the CIMMYT global wheat program and the remainder for Seeds of Discovery, a CIMMYT-led project supported by Mexico’s Ministry of Agriculture, Livestock, Fisheries and Food (SAGARPA), which aims to unlock new wheat genetic diversity able to address climate change challenges.

Over the last two years, she has served as lead author for two published studies and co-author for four others. One used genotyping-by-sequencing loci and gene-based markers to examine the diversity of more than 1,400 spring bread wheat seed collections from key wheat environments. Another applied genome-wide association analysis on a selection of landrace collections from Turkey.

“In the first, we discovered not only thousands of new DNA marker variations in landraces adapted to drought and heat, but a new allele for the vernalization gene, which influences the timing of wheat flowering, and new alleles for genes controlling grain quality, all in landraces from near wheat’s center of origin in Asia and the Middle East.”

Sehgal acknowledges the as-yet limited impact of molecular markers in wheat breeding. “Individual markers generally have small effects on genetically complex traits like yield or drought tolerance; moreover, many studies fail to account for “epistasis,” the mutual influence genes have on one another, within a genome.”

To address this, she and colleagues have carried out the first study to identify genomic regions with stable expression for grain yield and yield stability, as well as accounting for their individual epistatic interactions, in a large sample of elite wheat lines under multiple environments via genome wide association mapping. A paper on this work has been accepted for publication in Nature Scientific Reports.

Sehgal has found her experience at CIMMYT enriching. “I feel free here to pursue the work I truly enjoy and that can make a difference, helping our center’s wheat breeders to create improved varieties with which farmers can feed a larger, more prosperous global population in the face of climate change and new, deadly crop diseases.”

Surface water irrigation has the potential to boost cereal productivity in Bangladesh

CIMMYT’s interventions on cropping intensification in Southern Bangladesh look beyond surface water irrigation to ensure long-term environmental sustainability. Photo: T. Krupnik/CIMMYT
CIMMYT’s interventions on cropping intensification in Southern Bangladesh look beyond surface water irrigation to ensure long-term environmental sustainability. Photo: T. Krupnik/CIMMYT

DHAKA, Bangladesh (CIMMYT) – For the first time, researchers have mapped rivers and freshwater canals in southern Bangladesh using geospatial tools as part of a new initiative to help farmers in monsoon and rainfed systems transition to sustainable farming methods. Essential to this transition is the use of surface water for irrigation, which is less costly and more environmentally friendly than extracting groundwater.

A new study by the International Maize and Wheat Improvement Center (CIMMYT) indicates that by switching to surface water irrigation, farmers can greatly increase crop production, even in the face of soil and water salinity constraints. It identified over 121,000 hectares (ha) of currently fallow and rainfed cropland that could be placed under irrigation. Dry season wheat and maize production would also increase significantly, thereby greatly benefiting national cereal productivity.

Access to irrigation is needed to ensure crops will grow during southern Bangladesh’s dry season, a challenge for farmers who have traditionally relied on rainfed cultivation. Extracting groundwater for irrigation is energy-intensive, but southern Bangladesh has a dense network of rivers and natural canals that can be used for surface water irrigation.

In order to maximize productivity without expanding to new land, farmers in southern Bangladesh will need to rotate at least two crops per year. By using crop rotation, an SI practice that can boost yields, increase profits, protect the environment, and improve soil function and quality, farmers can grow different crops on the same plot, minimizing crop expansion into forests.

Surface water irrigation can increase cereal productivity and intensify cropping systems, even in the face of soil and water salinity constraints. Photo: T. Krupnik/CIMMYT
Surface water irrigation can increase cereal productivity and intensify cropping systems, even in the face of soil and water salinity constraints. Photo: T. Krupnik/CIMMYT

As South Asia’s population continues to rise and more people move out of poverty, changing dietary preferences are increasing the demand for wheat and maize, while maintaining the demand for rice. However, the average increase in the yield potential of staple crops since the 1960s has been negligible, while farm area per capita has shrunk more than 60 percent to just a tenth of a hectare per person, according to 2014 World Bank Indicators.

The Government of Bangladesh recently adopted land- and water-use policies to support agricultural development in southern Bangladesh by calling for donors to invest over $7 billion. Of these funds, $500 million will be allocated for surface water irrigation to help farmers transition from monsoon rice-fallow or rainfed systems to intensified double-cropping systems.

Future interventions on cropping intensification in southern Bangladesh must look beyond surface water irrigation to assess where conjunctive use of groundwater might be needed and to ensure long-term environmental sustainability. While research results support the targeted use of surface water irrigation alongside improved water governance measures, more viable crop diversification options must be explored and the environmental impact of large-scale irrigation development needs to be assessed.

Building on this study, the CIMMYT-led Cereal Systems Initiative for South Asia will work with national agricultural research systems, government and private sector partners to develop policy and market interventions that continue to build sustainable intensification strategies for both irrigated and rainfed systems across southern Bangladesh.

To read the full study, click here.