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.
Sorghum field in Kiboko, Kenya. (Photo: E Manyasa/ICRISAT)
As part of the One CGIAR reform, the Global Science Group on Genetic Innovation will implement a crop breeding and seed systems project for key crops including groundnut, sorghum and millet, across western and eastern African countries.
The International Maize and Wheat Improvement Center (CIMMYT), a leader in innovative partnerships, breeding and agronomic science for sustainable agri-food systems, will lead the project.
The Accelerated Varietal Improvement and Seed Delivery of Legumes and Cereals in Africa (AVISA) project aims to improve the health and livelihoods of millions by increasing the productivity, profitability, resilience and marketability of nutritious grain, legumes and cereal crops. The project focuses on strengthening networks to modernize crop breeding by CGIAR and national program partners, and public-private partnerships to strengthen seed systems. The project currently works in Burkina Faso, Ethiopia, Ghana, Mali, Nigeria, Uganda and Tanzania.
“Sorghum, groundnut and millets are essential staples of nutritious diets for millions of farmers and consumers and are crucial for climate-change-resilient farming systems,” explained CIMMYT Deputy Director General and Head of Genetic Resources, Kevin Pixley. “The oversight of this project by CGIAR’s Genetic Innovation Science Group will ensure continued support for the improvement of these crops in partnership with the national agricultural research and extension systems (NARES) that work with and for farmers,” he said.
“CIMMYT is delighted to lead this project on behalf of the Genetic Innovations Science Group and CGIAR,” confirms CIMMYT Director General, Bram Govaerts.
“We look forward to contributing to co-design and co-implement with partners and stakeholders the next generation of programs that leverage and build the strengths of NARES, CGIAR and others along with the research to farmers and consumers continuum to improve nutrition, livelihoods, and resilience to climate change through these crops and their cropping systems.”
The Harnessing Appropriate-Scale Farm Mechanization in Zimbabwe (HAFIZ) project aims to support investments by the government and by the private sector in appropriate-scale farm mechanization in Zimbabwe, particularly around Pfumvudza (a system of manual conservation agriculture), and transfer learnings to South Africa.
Overall, the project has the goal to improve access to mechanization and reduce labor drudgery whilst stimulating the adoption of climate-smart/sustainable intensification technologies. The project will improve the understanding of private sector companies involved in appropriate-scale farm mechanisation towards the local markets in which they operate.
Manufacturing knowledge of two-wheel and small four-wheel tractor operated implements for mechanized Pfumvudza will also increase and private sector companies will have increased access to information through the development and strengthening of regional and national communities of practitioners on appropriate-scale farm mechanization. Finally, the project will strengthen the capacity of the existing knowledge networks around appropriate-scale mechanisation in Zimbabwe, through the results that will be generated and through the regular multi-stakeholder roundtables that will be organised.
Objectives
Increasing and more spatially-targeted Government spending in appropriate-scale farm mechanisation in Zimbabwe (and South Africa)
Increasing sales of appropriate-scale farm mechanization equipment in Zimbabwe (and South Africa) thanks to more targeted marketing by private sector (both in terms of geographies and clients)
Local manufacturing and commercialization of two-wheel tractor operated basin diggers and bed planters in Zimbabwe.
Farmers learn about two-wheel tractors. (Photo: CIMMYT)
A new project aims to climate-proof Zimbabwean farms through improved access to small-scale mechanization to reduce labor bottlenecks. Harnessing Appropriate-scale Farm mechanization In Zimbabwe (HAFIZ) is funded by the Australian Department of Foreign Affairs and Trade (DFAT) through ACIAR and led by the International Maize and Wheat Improvement Center (CIMMYT).
The project aligns with the Zimbabwean nationwide governmental program Pfumvudza, which promotes agricultural practices based on the principles of conservation agriculture. The initiative aims to increase agricultural productivity through minimum soil disturbance, a permanent soil cover, mulching and crop diversification.
Over 18 months, the project will work with selected service providers to support mechanized solutions that are technically, environmentally and economically appropriate for use in smallholder settings.
Speaking during the project launch, the Permanent Secretary of the Ministry of Lands, Agriculture, Fisheries, Water and Rural Development in Zimbabwe, John Basera, explained the tenets of Pfumvudza which translates as “a new season.” A new season of adopting climate-smart technologies, conservation agriculture practices and increasing productivity. Simply put, Pfumvudza means a sustainable agricultural productivity scheme.
“Pfumvudza was a big game-changer in Zimbabwe. We tripled productivity from 0.45 to 1.4 [metric tons] per hectare. Now the big challenge for all of us is to sustain and consolidate the growth, and this is where mechanization comes into place,” Basera said. “This project is an opportunity for the smallholder farmer in Zimbabwe, who contributes to over 60% of the food in the country, to be able to produce more with less.”
Service providers participate in a training at the Institute of Agricultural Engineering, Zimbabwe. (Photo: Frédéric Baudron/CIMMYT)
The mechanics of sustainable intensification
Building on the findings of the completed ACIAR-funded project Farm Mechanization and Conservation Agriculture for Sustainable Intensification (FACASI), the new initiative will work with selected farmers and service providers to identify farming systems most suitable for mechanization. It will also assist companies in targeting their investments as they test a range of technologies powered by small-engine machinery adapted to the Zimbabwe context and transfer the resultant learnings to South Africa.
Conservation agriculture adoption offers multidimensional benefits to the farmers with significant yields and sustainability of their systems. The introduction of mechanization in systems using animals for draught reduces the livestock energy demand — energy that will contribute to increasing meat and milk production.
A service provider demonstrates a small-scale maize sheller in Nyanga, Zimbabwe. (Photo: Frédéric Baudron/CIMMYT)
While conservation agriculture and research alone cannot solve all the issues affecting agricultural productivity, awareness-raising is integral to help address these issues, and this is where small-scale mechanization comes in, says ACIAR Crops Research Program Manager, Eric Huttner.
“We learnt a lot from FACASI and a similar project in Bangladesh on the opportunities of appropriate small-scale mechanization as a tool towards sustainable intensification when adopted by farmers,” he explained. “If we avoid the mistakes of the past, where large-scale mechanization efforts were invested in the wrong place and resulted in ineffective machines unusable for farmers, we can make a huge difference in increasing yields and reducing farm drudgery,” Huttner said.
Agriculture is one of the five main greenhouse gas-emitting sectors where innovations can be found to reach net zero emissions, according to the new documentary and ten-part miniseries “Solving for Zero: The Search for Climate Innovation.” The documentary tells the stories of scientists and innovators racing to develop solutions such as low-carbon cement, wind-powered global transportation, fusion electricity generation and sand that dissolves carbon in the oceans.
Three CGIAR scientists are featured in the documentary, speaking about the contributions being made by agricultural research.
Whereas all sectors of the global economy must contribute to achieve net zero emissions by 2050 to prevent the worse effects of climate change, agricultural innovations are needed by farmers at the front line of climate change today.
CIMMYT breeder Yoseph Beyene spoke to filmmakers about the use of molecular breeding to predict yield potential. (Image: Wondrium.com)
Breeding climate-smart crops
“Climate change has been a great disaster to us. Day by day it’s getting worse,” said Veronica Dungey, a maize farmer in Kenya interviewed for the documentary.
Around the world, 200 million people depend on maize for their livelihood, while 90% of farmers in Africa are smallholder farmers dependent on rainfall, and facing drought, heatwaves, floods, pests and disease related to climate change. According to CGIAR, agriculture must deliver 60% more food by 2050, but without new technologies, each 1°C of warming will reduce production by 5%.
“Seed is basic to everything. The whole family is dependent on the produce from the farm,” explained Yoseph Beyene, Regional Maize Breeding Coordinator for Africa and Maize Breeder for Eastern Africa at the International Maize and Wheat Improvement Center (CIMMYT). As a child in a smallholder farming family with no access to improved seeds, Beyene learned the importance of selecting the right seed from year to year. It was at high school that Beyene was shown the difference between improved varieties and the locally-grown seed, and decided to pursue a career as a crop breeder.
Today, the CIMMYT maize program has released 200 hybrid maize varieties adapted for drought conditions in sub-Saharan Africa, called hybrids because they combine maize lines selected to express important traits over several generations. Alongside other CGIAR Research Centers, CIMMYT continues to innovate with accelerated breeding approaches to benefit smallholder farmers.
“Currently we use two kinds of breeding. One is conventional breeding, and another one is molecular breeding to accelerate variety development. In conventional breeding you have to evaluate the hybrid in the field,” Beyene said. “Using molecular markers, instead of phenotypic evaluation in the field, we are evaluating the genetic material of a particular line. We can predict based on marker data which new material is potentially good for yield.”
Such innovations are necessary considering the speed and the complexity of challenges faced by smallholder farmers due climate change, which now includes fall armyworm. “Fall armyworm is a recent pest in the tropics and has affected a lot of countries,” said Moses Siambi, CIMMYT Regional Representative for Africa. “Increased temperatures have a direct impact on maize production because of the combination of temperature of humidity, and then you have these high insect populations that lead to low yield.”
Resistance to fall armyworm is now included in new CIMMYT maize hybrids alongside many other traits such as yield, nutrition, and multiple environmental and disease resistances.
Ana María Loboguerrero, Research Director for Climate Action at the Alliance of Bioversity and CIAT, spoke about CGIAR’s community-focused climate work. (Image: Wondrium.com)
Building on CGIAR’s climate legacy
Ana María Loboguerrero, Research Director for Climate Action at the Alliance of Bioversity International and the International Center for Tropical Agriculture (CIAT), told the filmmakers about CGIAR’s community-focused climate work, which includes Climate-Smart Villages and Valleys. Launched in 2009, these ongoing projects span the global South and effectively bridge the gap between innovation, research and farmers living with the climate crisis at their doorsteps.
“Technological innovations are critical to food system transformation,” said Loboguerrero, who was a principal researcher for the CGIAR Research Program on Climate Change, Agriculture and Food Security (CCAFS). “But if local contexts are not considered, even the best innovations may fail because they do not respond to beneficiaries needs.”
CCAFS’s impressive legacy — in research, influencing policy and informing $3.5 billion of climate-smart investments, among many achievements — is now being built upon by a new CGIAR portfolio of initiatives. Several initiatives focus on building systemic resilience against climate and scaling up climate action started by CCAFS that will contribute to a net-zero carbon future.
Loboguerrero pointed to other innovations that were adopted because they addressed local needs and were culturally appropriate. These include the uptake of new varieties of wheat, maize, rice and beans developed by CGIAR Research Centers. Taste, color, texture, cooking time and market demand are critical to the success of new varieties. Being drought-resistant or flood-tolerant is not enough.
Local Technical Agroclimatic Committees, another CCAFS innovation that is currently implemented in 11 countries across Latin America, effectively delivers weather information in agrarian communities across the tropics. Local farmers lead these committees to receive and disseminate weather information to better plan when they sow their seeds. “This success would not have been possible if scientists hadn’t gotten out of their labs to collaborate with producers in the field,” Loboguerrero said.
Climate adaptation solutions
Across CGIAR, which represents 13 Research Centers and Alliances, and a network of national and private sector partners, the goal is to provide climate adaptation solutions to 500 million small-scale farmers around the world by 2030. This work also covers reducing agricultural emissions, environmental impacts and even the possibility of capturing carbon while improving soil health.
Interested in learning more? The documentary “Solving for Zero: The Search for Climate Innovation” is available at Wondrium.com alongside a 10-part miniseries exploring the ongoing effort to address climate change.
The paper “Enlisting wild grass genes to combat nitrification in wheat farming: A nature-based solution” received the 2021 Cozzarelli Prize, which recognizes outstanding articles published in the journal Proceedings of the National Academy of Sciences of the United States of America (PNAS). The paper was published as a joint research collaboration of Japan International Research Center for Agricultural Sciences (JIRCAS), the International Maize and Wheat Improvement Center (CIMMYT), the University of the Basque Country (UPV/EHU) and Nihon University.
The study identifies of a chromosomal region that regulates the biological nitrification inhibition (BNI) ability of wheat grass (Leymus racemosus), a wild relative of wheat. It also outlines the development of the world’s first BNI-enhanced wheat, through intergeneric crossing with a high-yielding wheat cultivar.
This research result is expected to contribute to the prevention of nitrogen pollution that leads to water pollution and greenhouse gas emissions, reducing the use of nitrogen fertilizer while maintaining productivity.
Best of the year
PNAS is one of the most cited scientific journals in the world, publishing more than 3,000 papers per year on all aspects of science. A total of 3,476 papers were published in 2021, covering six fields: Physical and Mathematical Sciences, Biological Sciences, Engineering and Applied Sciences, Biomedical Sciences, Behavioral and Social Sciences, and Applied Biological, Agricultural and Environmental Sciences.
The Cozzarelli Prize was established in 2005 as the PNAS Paper of the Year Prize and renamed in 2007 to honor late editor-in-chief Nicholas R. Cozzarelli. It is awarded yearly by the journal’s Editorial Board to one paper from each field reflecting scientific excellence and originality. The BNI research paper received the award in the category of Applied Biological, Agricultural, and Environmental Sciences.
The awards ceremony will be held online on May 1, 2022, and a video introducing the results of this research will be available.
CIMMYT has collaborated with JIRCAS on BNI-enhanced wheat research since 2009, with funding from Japan’s Ministry of Agriculture, Forestry and Fisheries. CIMMYT is one of the founding members of the BNI Consortium, established in 2015.
The CGIAR Research Programs on Wheat (WHEAT) and Maize (MAIZE) co-funded BNI research since 2014 and 2019 respectively, until their conclusion at the end of 2021.
BNI research has been positioned in the “Measures for achievement of Decarbonization and Resilience with Innovation (MeaDRI)” strategy of Japan’s Ministry of Agriculture, Forestry and Fisheries, and was also selected as one of the ministry’s “Top 10 agricultural technology news for 2021.”
How does CIMMYT’s improved maize get to the farmer?
CIMMYT is proud to announce a new, improved highland maize hybrid that is now available for uptake by public- and private-sector partners, especially those interested in marketing or disseminating hybrid maize seed across upper altitudes of Eastern Africa and similar agro-ecologies. National agricultural research system (NARS) and seed companies are hereby invited to apply for licenses to pursue national release, scale-up seed production, and deliver these maize hybrids to farming communities.
The deadline to submit applications to be considered during the first round of allocations is 8 April 2022. Applications received after that deadline will be considered during subsequent rounds of product allocations.
The newly available CIMMYT maize hybrid, CIM20EAPP3-01-47, was identified through rigorous trialing and a stage-gate advancement process that culminated in the 2021 Eastern Africa Regional On-Farm Trials for CIMMYT’s eastern Africa highland maize breeding pipeline (EA-PP3). While individual products will vary, the EA-PP3 pipeline aims to develop maize hybrids fitting the product profile described in the following table:
Product profile
Basic traits
Nice-to-have / Emerging traits
Eastern Africa Product Profile 3 (EA-PP3)
Late -maturing, white, high yielding, drought tolerant, NUE, and resistant to GLS, TLB, Ear rots, and rust
MLN, fall armyworm, cold tolerance
Application instructions, and other relevant material is available via the CIMMYT Maize Product Catalog and in the links provided below.
Shelves filled with maize seed samples make up the maize active collection at the germplasm bank at CIMMYT’s global headquarters in Texcoco, Mexico. It contains around 28,000 unique samples of maize seed — including more than 24,000 farmer landraces — and related species. (Photo: Xochiquetzal Fonseca/CIMMYT)
A new $25.7 million project, led by the International Maize and Wheat Improvement Center (CIMMYT), a Research Center part of CGIAR, the world’s largest public sector agriculture research partnership, is expanding the use of biodiversity held in the world’s genebanks to develop new climate-smart crop varieties for millions of small-scale farmers worldwide.
As climate change accelerates, agriculture will be increasingly affected by high temperatures, erratic rainfall, drought, flooding and sea-level rise. Looking to the trove of genetic material in genebanks, scientists believe they can enhance the resilience of food production by incorporating this diversity into new crop varieties — overcoming many of the barriers to fighting malnutrition and hunger around the world.
“Better crops can help small-scale farmers produce more food despite the challenges of climate change. Drought-resistant staple crops, such as maize and wheat, that ensure food amid water scarcity, and faster-growing, early-maturing varieties that produce good harvests in erratic growing seasons can make a world of difference for those who depend on agriculture. This is the potential for climate-adaptive breeding that lies untapped in CGIAR’s genebanks,” said Claudia Sadoff, Managing Director, Research Delivery and Impact, and Executive Management Team Convener, CGIAR.
Over five years, the project, supported by the Bill & Melinda Gates Foundation, aims to identify plant accessions in genebanks that contain alleles, or gene variations, responsible for characteristics such as heat, drought or salt tolerance, and to facilitate their use in breeding climate-resilient crop varieties. Entitled Mining useful alleles for climate change adaptation from CGIAR genebanks, the project will enable breeders to more effectively and efficiently use genebank materials to develop climate-smart versions of important food crops, including cassava, maize, sorghum, cowpea and rice.
Wild rice. (Photo: IRRI)
The project is a key component of a broader initiative focused on increasing the value and use of CGIAR genebanks for climate resilience. It is one of a series of Innovation Sprints coordinated by the Agriculture Innovation Mission for Climate (AIM4C) initiative, which is led by the United Arab Emirates and the United States.
“Breeding new resilient crop varieties quickly, economically and with greater precision will be critical to ensure small-scale farmers can adapt to climate change,” said Enock Chikava, interim Director of Agricultural Development at the Bill & Melinda Gates Foundation. “This initiative will contribute to a more promising and sustainable future for the hundreds of millions of Africans who depend on farming to support their families.”
Over the past 40 years, CGIAR Centers have built up the largest and most frequently accessed network of genebanks in the world. The network conserves and makes nearly three-quarters of a million crop accessions available to scientists and governments. CGIAR genebanks hold around 10% of the world’s plant germplasm in trust for humanity, but account for about 94% of the germplasm distributed under the International Treaty on Plant Genetic Resources for Food and Agriculture, which ensures crop breeders globally have access to the fundamental building blocks of new varieties.
“This research to develop climate-smart crop varieties, when scaled, is key to ensuring that those hardest hit by climate shocks have access to affordable staple foods,” said Jeffrey Rosichan, Director of the Crops of the Future Collaborative of the Foundation for Food & Agriculture Research (FFAR). “Further, this initiative benefits US and world agriculture by increasing genetic diversity and providing tools for growers to more rapidly adapt to climate change.”
“We will implement, for the first time, a scalable strategy to identify valuable variations hidden in our genebanks, and through breeding, deploy these to farmers who urgently need solutions to address the threat of climate change,” said Sarah Hearne, CIMMYT principal scientist and leader of the project.
Building on ten years of support to CIMMYT from the Mexican government, CGIAR Trust Fund contributors and the United Kingdom’s Biotechnology and Biological Sciences Research Council (BBSRC), the project combines the use of cutting-edge technologies and approaches, high-performance computing, GIS mapping, and new plant breeding methods, to identify and use accessions with high value for climate-adaptive breeding of varieties needed by farmers and consumers.
INTERVIEW OPPORTUNITIES:
Sarah Hearne – Principal Scientist, International Maize and Wheat Improvement Center (CIMMYT)
FOR MORE INFORMATION, OR TO ARRANGE INTERVIEWS, CONTACT THE MEDIA TEAM:
Marcia MacNeil, Head of Communications, CIMMYT. m.macneil@cgiar.org, +52 5558042004 ext. 2070.
Over the course of ten years, WHEAT worked with hundreds of research and development partners worldwide to release high-yielding, disease-resistant, nutritious and climate-resilient wheat varieties, and efficient, sustainable wheat-based cropping systems.
This final report from 2021 shares important research on staple cereals’ role in global efforts towards food security, the number and distribution of wheat farms, the expected impact of climate change on wheat productivity, nitrogen-in-agriculture research, nutrition, and the most critical, immediate effects of COVID-19 on food systems, and more.
With its national partners, WHEAT released 70 new CGIAR-derived wheat varieties to farmers in 13 countries in 2021, and developed 18 innovations in the areas of genetics, biophysics, farm management, research and communication methods, or social sciences.
Emerging in the last 120 years, science-based plant breeding begins by creating novel diversity from which useful new varieties can be identified or formed. The most common approach is making targeted crosses between parents with complementary, desirable traits. This is followed by selection among the resulting plants to obtain improved types that combine desired traits and performance. A less common approach is to expose plant tissues to chemicals or radiation that stimulate random mutations of the type that occur in nature, creating diversity and driving natural selection and evolution.
Determined by farmers and consumer markets, the target traits for plant breeding can include improved grain and fruit yield, resistance to major diseases and pests, better nutritional quality, ease of processing, and tolerance to environmental stresses such as drought, heat, acid soils, flooded fields and infertile soils. Most traits are genetically complex — that is, they are controlled by many genes and gene interactions — so breeders must intercross and select among hundreds of thousands of plants over generations to develop and choose the best.
Plant breeding over the last 100 years has fostered food and nutritional security for expanding populations, adapted crops to changing climates, and helped to alleviate poverty. Together with better farming practices, improved crop varieties can help to reduce environmental degradation and to mitigate climate change from agriculture.
Is plant breeding a modern technique?
Plant breeding began around 10,000 years ago, when humans undertook the domestication of ancestral food crop species. Over the ensuing millennia, farmers selected and re-sowed seed from the best grains, fruits or plants they harvested, genetically modifying the species for human use.
Modern, science-based plant breeding is a focused, systematic and swifter version of that process. It has been applied to all crops, among them maize, wheat, rice, potatoes, beans, cassava and horticulture crops, as well as to fruit trees, sugarcane, oil palm, cotton, farm animals and other species.
With modern breeding, specialists began collecting and preserving crop diversity, including farmer-selected heirloom varieties, improved varieties and the crops’ undomesticated relatives. Today hundreds of thousands of unique samples of diverse crop types, in the form of seeds and cuttings, are meticulously preserved as living catalogs in dozens of publicly-administered “banks.”
The International Maize and Wheat Improvement Center (CIMMYT) manages a germplasm bank containing more than 180,000 unique maize- and wheat-related seed samples, and the Svalbard Global Seed Vault on the Norwegian island of Spitsbergen preserves back-up copies of nearly a million collections from CIMMYT and other banks.
Through genetic analyses or growing seed samples, scientists comb such collections to find useful traits. Data and seed samples from publicly-funded initiatives of this type are shared among breeders and other researchers worldwide. The complete DNA sequences of several food crops, including rice, maize, and wheat, are now available and greatly assist scientists to identify novel, useful diversity.
Much crop breeding is international. From its own breeding programs, CIMMYT sends half a million seed packages each year to some 800 partners, including public research institutions and private companies in 100 countries, for breeding, genetic analyses and other research.
A field worker removes the male flower of a wheat spike, as part of controlled pollination in breeding. (Photo: Alfonso Cortés/CIMMYT)
A century of breeding innovations
Early in the 20th century, plant breeders began to apply the discoveries of Gregor Mendel, a 19th-century mathematician and biologist, regarding genetic variation and heredity. They also began to take advantage of heterosis, commonly known as hybrid vigor, whereby progeny of crosses between genetically different lines will turn out stronger or more productive than their parents.
Modern statistical methods to analyze experimental data have helped breeders to understand differences in the performance of breeding offspring; particularly, how to distinguish genetic variation, which is heritable, from environmental influences on how parental traits are expressed in successive generations of plants.
Since the 1990s, geneticists and breeders have used molecular (DNA-based) markers. These are specific regions of the plant’s genome that are linked to a gene influencing a desired trait. Markers can also be used to obtain a DNA “fingerprint” of a variety, to develop detailed genetic maps and to sequence crop plant genomes. Many applications of molecular markers are used in plant breeding to select progenies of breeding crosses featuring the greatest number of desired traits from their parents.
Plant breeders normally prefer to work with “elite” populations that have already undergone breeding and thus feature high concentrations of useful genes and fewer undesirable ones, but scientists also introduce non-elite diversity into breeding populations to boost their resilience and address threats such as new fungi or viruses that attack crops.
Transgenics are products of one genetic engineering technology, in which a gene from one species is inserted in another. A great advantage of the technology for crop breeding is that it introduces the desired gene alone, in contrast to conventional breeding crosses, where many undesired genes accompany the target gene and can reduce yield or other valuable traits. Transgenics have been used since the 1990s to implant traits such as pest resistance, herbicide tolerance, or improved nutritional value. Transgenic crop varieties are grown on more than 190 million hectares worldwide and have increased harvests, raised farmers’ income and reduced the use of pesticides. Complex regulatory requirements to manage their potential health or environmental risks, as well as consumer concerns about such risks and the fair sharing of benefits, make transgenic crop varieties difficult and expensive to deploy.
Genome editing or gene editing techniques allow precise modification of specific DNA sequences, making it possible to enhance, diminish or turn off the expression of genes and to convert them to more favorable versions. Gene editing is used primarily to produce non-transgenic plants like those that arise through natural mutations. The approach can be used to improve plant traits that are controlled by single or small numbers of genes, such as resistance to diseases and better grain quality or nutrition. Whether and how to regulate gene edited crops is still being defined in many countries.
The mobile seed shop of Victoria Seeds Company provides access to improved maize varieties for farmers in remote villages of Uganda. (Photo: Kipenz Films for CIMMYT)
Selected impacts of maize and wheat breeding
In the early 1990s, a CIMMYT methodology led to improved maize varieties that tolerate moderate drought conditions around flowering time in tropical, rainfed environments, besides featuring other valuable agronomic and resilience traits. By 2015, almost half the maize-producing area in 18 countries of sub-Saharan Africa — a region where the crop provides almost a third of human calories but where 65% of maize lands face at least occasional drought — was sown to varieties from this breeding research, in partnership with the International Institute of Tropical Agriculture (IITA). The estimated yearly benefits are as high as $1 billion.
Intensive breeding for resistance to Maize Lethal Necrosis (MLN), a viral disease that appeared in eastern Africa in 2011 and quickly spread to attack maize crops across the continent, allowed the release by 2017 of 18 MLN-resistant maize hybrids.
Improved wheat varieties developed using breeding lines from CIMMYT or the International Centre for Agricultural Research in the Dry Areas (ICARDA) cover more than 100 million hectares, nearly two-thirds of the area sown to improved wheat worldwide, with benefits in added grain that range from $2.8 to 3.8 billion each year.
Breeding for resistance to devastating crop diseases and pests has saved billions of dollars in crop losses and reduced the use of costly and potentially harmful pesticides. A 2004 study showed that investments since the early 1970s in breeding for resistance in wheat to the fungal disease leaf rust had provided benefits in added grain worth 5.36 billion 1990 US dollars. Global research to control wheat stem rust disease saves wheat farmers the equivalent of at least $1.12 billion each year.
Crosses of wheat with related crops (rye) or even wild grasses — the latter known as wide crosses — have greatly improved the hardiness and productivity of wheat. For example, an estimated one-fifth of the elite wheat breeding lines in CIMMYT international yield trials features genes from Aegilops tauschii, commonly known as “goat grass,” that boost their resilience and provide other valuable traits to protect yield.
Biofortification — breeding to develop nutritionally enriched crops — has resulted in more than 60 maize and wheat varieties whose grain offers improved protein quality or enhanced levels of micro-nutrients such as zinc and provitamin A. Biofortified maize and wheat varieties have benefited smallholder farm families and consumers in more than 20 countries across sub-Saharan Africa, Asia, and Latin America. Consumption of provitamin-A-enhanced maize or sweet potato has been shown to reduce chronic vitamin A deficiencies in children in eastern and southern Africa. In India, farmers have grown a high-yielding sorghum variety with enhanced grain levels of iron and zinc since 2018 and use of iron-biofortified pearl millet has improved nutrition among vulnerable communities.
Innovations in measuring plant responses include remote sensing systems, such as multispectral and thermal cameras flown over breeding fields. In this image of the CIMMYT experimental station in Obregón, Mexico, water-stressed plots are shown in green and red. (Photo: CIMMYT and the Instituto de Agricultura Sostenible)
Thefuture
Crop breeders have been laying the groundwork to pursue genomic selection. This approach takes advantage of low-cost, genome-wide molecular markers to analyze large populations and allow scientists to predict the value of particular breeding lines and crosses to speed gains, especially for improving genetically complex traits.
Speed breeding uses artificially-extended daylength, controlled temperatures, genomic selection, data science, artificial intelligence tools and advanced technology for recording plant information — also called phenotyping — to make breeding faster and more efficient. A CIMMYT speed breeding facility for wheat features a screenhouse with specialized lighting, controlled temperatures and other special fixings that will allow four crop cycles — or generations — to be grown per year, in place of only two cycles with normal field trials. Speed breeding facilities will accelerate the development of productive and robust varieties by crop research programs worldwide.
Data analysis and management. Growing and evaluating hundreds of thousands of plants in diverse trials across multiple sites each season generates enormous volumes of data that breeders must examine, integrate, and co-analyze to inform decisions, especially about which lines to cross and which populations to discard or move forward. New informatics tools such as the Enterprise Breeding System will help scientists to manage, analyze and apply big data from genomics, field and lab studies.
Following the leaders. Driven by competition and the quest for profits, private companies that market seed and other farm products are generally on the cutting edge of breeding innovations. The CGIAR’s Excellence in Breeding (EiB) initiative is helping crop breeding programs that serve farmers in low- and middle-income countries to adopt appropriate best practices from private companies, including molecular marker-based approaches, strategic mechanization, digitization and use of big data to drive decision making. Modern plant breeding begins by ensuring that the new varieties produced are in line with what farmers and consumers want and need.
Cover photo: CIMMYT experimental station in Toluca, Mexico. Located in a valley at 2,630 meters above sea level with a cool and humid climate, it is the ideal location for selecting wheat materials resistant to foliar diseases, such as wheat rust. Conventional plant breeding involves selection among hundreds of thousands of plants from crosses over many generations, and requires extensive and costly field, screenhouse and lab facilities. (Photo: Alfonso Cortés/CIMMYT)
How does CIMMYT’s improved maize get to the farmer?
The International Maize and Wheat Improvement Center (CIMMYT) is offering a new set of elite, improved maize hybrids to partners for commercialization in eastern Africa and similar agro-ecological zones. National agricultural research systems (NARS) and seed companies are invited to apply for licenses to register and commercialize these new hybrids, in order to bring the benefits of the improved seed to farming communities.
The deadline to submit applications to be considered during the first round of allocations is February 11, 2022. Applications received after that deadline will be considered during the following round of product allocations.
Information about the newly available CIMMYT maize hybrids from the Latin America breeding program, application instructions and other relevant material is available in the CIMMYT Maize Product Catalog and in the links provided below.
Genomic selection identifies individual plants based on the information from molecular markers, DNA signposts for genes of interest, that are distributed densely throughout the wheat genome. For wheat blast, the results can help predict which wheat lines hold promise as providers of blast resistance for future crosses and those that can be advanced to the next generation after selection.
In this study, scientists from the International Maize and Wheat Improvement Center (CIMMYT) and partners evaluated genomic selection by combining genotypic data with extensive and precise field data on wheat blast responses for three sets of genetically diverse wheat lines and varieties, more than 700 in all, grown by partners at locations in Bangladesh and Bolivia over several crop cycles.
The study also compared the use of a small number of molecular markers linked to the 2NS translocation, a chromosome segment from the grass species Aegilops ventricosa that was introduced into wheat in the 1980s and is a strong and stable source of blast resistance, with predictions using thousands of genome-wide markers. The outcome confirms that, in environments where wheat blast resistance is determined by the 2NS translocation, genotyping using one-to-few markers tagging the translocation is enough to predict the blast response of wheat lines.
Finally, the authors found that selection based on a few wheat blast-associated molecular markers retained 89% of lines that were also selected using field performance data, and discarded 92% of those that were discarded based on field performance data. Thus, both marker-assisted selection and genomic selection offer viable alternatives to the slower and more expensive field screening of many thousands of wheat lines in hot-spot locations for the disease, particularly at early stages of breeding, and can speed the development of blast-resistant wheat varieties.
The research was conducted by scientists from the International Maize and Wheat Improvement Center (CIMMYT), the Bangladesh Wheat and Maize Research Institute (BWMRI), the Instituto Nacional de Innovación Agropecuaria y Forestal (INIAF) of Bolivia, the Borlaug Institute for South Asia (BISA) and the Indian Council of Agricultural Research (ICAR) in India, the Swedish University of Agricultural Sciences (Alnarp), and Kansas State University in the USA. Funding for the study was provided by the Bill & Melinda Gates Foundation, the Foreign and Commonwealth Development Office of the United Kingdom, the U.S. Agency for International Development (USAID), the CGIAR Research Program on Wheat (WHEAT), the Indian Council of Agricultural Research (ICAR), the Swedish Research Council, and the Australian Centre for International Agricultural Research (ACIAR).
Cover photo: A researcher from Bangladesh shows blast infected wheat spikes and explains how the disease directly attacks the grain. (Photo: Chris Knight/Cornell University)
At the same time, climate change has likely slowed breeding progress for high-yielding, broadly adapted wheat, according to the new study, published recently in Nature Plants.
“Breeders are usually optimistic, overlooking many climate change factors when selecting,” said Matthew Reynolds, wheat physiologist at the International Maize and Wheat Improvement Center (CIMMYT) and co-author of the publication. “Our findings undermine this optimism and show that the amplified interaction of wheat lines with the environment due to climate change has made it harder for breeders to identify outstanding, broadly adapted lines.”
What do 10 million data points tell scientists?
Each year for nearly half a century, wheat breeders taking part in the CIMMYT-led International Wheat Improvement Network (IWIN) have tested approximately 1,000 new, experimental wheat lines and varieties at some 700 field sites in over 90 countries.
Promising lines are taken up by wheat breeding programs worldwide, while data from the trials is used to guide global breeding and other critical wheat research, explained Wei Xiong, CIMMYT crop modeler/physiologist based in China and lead author of the new paper.
“To date, this global testing network has collected over 10 million data points, while delivering wheat germplasm estimated to be worth several billion dollars annually in extra productivity to hundreds of millions of farmers in less developed countries,” Xiong said.
Xiong and his colleagues analyzed “crossover interactions” — changes in the relative rankings of pairs of wheat lines — in 38 years of data from four kinds of wheat breeding trials, looking for the extent to which climate change or breeding progress have flipped those rankings. Two of the trials whose data they examined focused on yield in bread wheat and durum wheat, while the other two assessed wheat lines’ performance under high temperatures and in semi-arid environments, respectively.
In addition to raising yields, wheat breeders are endowing the crop with added resilience for rising temperatures.
“We found that warmer and more erratic climates since the 1980s have increased ranking changes in global wheat breeding by as much as 15 percent,” Xiong said. “This has made it harder for breeders to identify superior, broadly adapted lines and even led to scientists discarding potentially useful lines.”
Conversely, wheat cultivars emerging from breeding for tolerance to environmental stresses, particularly heat, are showing substantially more stable yields across a range of environments and fostering wheat’s adaptation to current, warmer climates, while opening opportunities for larger and faster genetic gains in the future, according to the study.
“Among other things, our findings argue for more targeted wheat breeding and testing to address rapidly shifting and unpredictable farming conditions,” Reynolds added.
Grafting wheat shoot to oat root gives the plant tolerance to a disease called “Take-all,” caused by a pathogen in soil. The white arrow shows the graft junction. (Photo: Julian Hibberd)
Grafting is the technique of joining the shoot of one plant with the root of another, so they continue to grow together as one. Until now it was thought impossible to graft grass-like plants in the group known as monocotyledons because they lack a specific tissue type, called the vascular cambium, in their stem.
Researchers at the University of Cambridge have discovered that root and shoot tissues taken from the seeds of monocotyledonous grasses — representing their earliest embryonic stages — fuse efficiently. Their results are published today in the journal Nature.
An estimated 60,000 plants are monocotyledons; many are crops that are cultivated at enormous scale, for example rice, wheat and barley.
The finding has implications for the control of serious soil-borne pathogens including Panama Disease, or Tropical Race 4, which has been destroying banana plantations for over 30 years. A recent acceleration in the spread of this disease has prompted fears of global banana shortages.
“We’ve achieved something that everyone said was impossible. Grafting embryonic tissue holds real potential across a range of grass-like species. We found that even distantly related species, separated by deep evolutionary time, are graft compatible,” said Julian Hibberd in the University of Cambridge’s Department of Plant Sciences, senior author of the report.
The technique allows monocotyledons of the same species, and of two different species, to be grafted effectively. Grafting genetically different root and shoot tissues can result in a plant with new traits — ranging from dwarf shoots, to pest and disease resistance.
Alison Bentley, CIMMYT Global Wheat Program Director and a contributor to the report, sees great potential for the grafting method to be applied to monocot crops grown by resource-poor farmers in the Global South. “From our major cereals, wheat and rice, to bananas and matoke, this technology could change the way we think about adapting food security crops to increasing disease pressures and changing climates.”
High magnification images show successful grafting of wheat in which a connective vein forms between root and shoot tissue after four months. White arrows show the graft junction. (Photo: Julian Hibberd)Monocotyledons breakthrough
The scientists found that the technique was effective in a range of monocotyledonous crop plants including pineapple, banana, onion, tequila agave and date palm. This was confirmed through various tests, including the injection of fluorescent dye into the plant roots — from where it was seen to move up the plant and across the graft junction.
“I read back over decades of research papers on grafting and everybody said that it couldn’t be done in monocots. I was stubborn enough to keep going — for years — until I proved them wrong,” said Greg Reeves, a Gates Cambridge Scholar in the University of Cambridge Department of Plant Sciences, and first author of the paper.
“It’s an urgent challenge to make important food crops resistant to the diseases that are destroying them,” Reeves explained. “Our technique allows us to add disease resistance, or other beneficial properties like salt-tolerance, to grass-like plants without resorting to genetic modification or lengthy breeding programmes.”
The world’s banana industry is based on a single variety, called the Cavendish banana — a clone that can withstand long-distance transportation. With no genetic diversity between plants, the crop has little disease-resilience. And Cavendish bananas are sterile, so disease resistance cannot be bred into future generations of the plant. Research groups around the world are trying to find a way to stop Panama Disease before it becomes even more widespread.
Image of date palm two and a half years after grafting. Inset shows a magnified region at the base of the plant, with the arrowhead pointing to the graft junction. (Photo: Julian Hibberd)
Grafting has been used widely since antiquity in another plant group called the dicotyledons. Dicotyledonous orchard crops — including apples and cherries, and high-value annual crops including tomatoes and cucumbers — are routinely produced on grafted plants because the process confers beneficial properties, such as disease resistance or earlier flowering.
The researchers have filed a patent for their grafting technique through Cambridge Enterprise. They have also received funding from Ceres Agri-Tech, a knowledge exchange partnership between five leading universities in the United Kingdom and three renowned agricultural research institutes.
“Panama disease is a huge problem threatening bananas across the world. It’s fantastic that the University of Cambridge has the opportunity to play a role in saving such an important food crop,” said Louise Sutherland, Director of Ceres Agri-Tech.
Ceres Agri-Tech, led by the University of Cambridge, was created and managed by Cambridge Enterprise. It has provided translational funding as well as commercialisation expertise and support to the project, to scale up the technique and improve its efficiency.
This research was funded by the Gates Cambridge Scholarship programme.
The University of Cambridge is one of the world’s top ten leading universities, with a rich history of radical thinking dating back to 1209. Its mission is to contribute to society through the pursuit of education, learning and research at the highest international levels of excellence.
The University comprises 31 autonomous Colleges and 150 departments, faculties and institutions. Its 24,450 student body includes more than 9,000 international students from 147 countries. In 2020, 70.6% of its new undergraduate students were from state schools and 21.6% from economically disadvantaged areas.
Cambridge research spans almost every discipline, from science, technology, engineering and medicine through to the arts, humanities and social sciences, with multi-disciplinary teams working to address major global challenges. Its researchers provide academic leadership, develop strategic partnerships and collaborate with colleagues worldwide.
The University sits at the heart of the ‘Cambridge cluster’, in which more than 5,300 knowledge-intensive firms employ more than 67,000 people and generate £18 billion in turnover. Cambridge has the highest number of patent applications per 100,000 residents in the UK.
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 the CGIAR System 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.
Cover photo: A banana producer in Kenya. (Photo: N. Palmer/CIAT)
Main building of CIMMYT’s maize doubled haploid facility in Kunigal, Karnataka state, India. (Photo: CIMMYT)
On December 3, 2021, the International Maize and Wheat Improvement Center (CIMMYT) and its partners inaugurated a state-of-the-art maize doubled haploid (DH) facility in Kunigal, in India’s Karnataka state. The facility was established by CIMMYT in partnership with the University of Agricultural Sciences, Bangalore (UAS Bangalore), with financial support from the CGIAR Research Program on Maize (MAIZE).
It is the first public sector facility of its kind in Asia, fulfilling a very important need for maize breeding programs in the region. The facility, operated by CIMMYT, will provide DH production services for CIMMYT’s and UAS Bangalore’s breeding programs, as well as for national agricultural research institutions and small- and medium-sized seed companies engaged in maize breeding across tropical Asia. This is expected to result in accelerated development and deployment of a greater number of elite, climate-resilient and nutritionally-enriched maize hybrids in tropical Asia.
DH technology has the potential to enhance genetic gains and breeding efficiency, especially in combination with other modern tools and technologies, such as molecular markers and genomic selection. The facility occupies 12 acres of land at the Agricultural Research Station in Kunigal, in southwestern India. It is expected to produce at least 25,000-30,000 maize DH lines per year.
R.S. Paroda (center) cuts the ribbon to inaugurate the maize doubled haploid facility in Kunigal, Karnataka state, India. He is flanked by S. Rajendra Prasad (left), vice chancellor of UAS Bangalore and B.M. Prasanna (right), director of CIMMYT’s Global Maize Program and the CGIAR Research Program on Maize. (Photo: CIMMYT)
Fast-track maize breeding in Asia
R.S. Paroda, who is a Padma Bhushan awardee in India and the chairman of the Trust for Advancement of Agricultural Sciences (TAAS) in New Delhi, thanked CIMMYT for its role in developing the facility. “The maize DH facility will revolutionize hybrid maize programs in both the public and private sectors in Asia, enabling fast-tracked development of climate-resilient and genetically diverse maize hybrids suitable for the rainfed maize-growing areas.”
S. Rajendra Prasad, vice chancellor of UAS Bangalore, appreciated the partnership between his institution and CIMMYT. “The facility will create opportunities to modernize maize breeding programs in India, besides serving as an educational and training hub for young students at the University,” he said. Members of UAS Bangalore Board of Management also participated in the formal opening of the facility.
B.M. Prasanna, director of CIMMYT’s Global Maize Program and the CGIAR Research Program on Maize (MAIZE), spearheaded the process of establishing this important breeding facility. “Along with similar maize DH facilities in Mexico and Kenya, which respectively serve Latin America and Africa, this third facility for Asia rounds up CIMMYT’s commitment to strengthen tropical maize breeding programs across the globe,” he explained.
Bram Govaerts, CIMMYT’s director general, participated through a recorded video message.
Attending the ceremony were also 150 post-graduate students, faculty from UAS Bangalore, researchers from UAS Raichur and the Indian Institute of Maize Research, CIMMYT maize scientists, and private-sector members of the International Maize Improvement Consortium for Asia (IMIC-Asia).
R.S. Paroda, chairman of the Trust for Advancement of Agricultural Sciences (TAAS) in New Delhi, unveils the inauguration plaque for the maize doubled haploid facility in Kunigal, Karnataka state, India. (Photo: CIMMYT)
Collaboration networks
A technical workshop titled “Transforming India’s Agriculture and Modernizing Maize Breeding Programs” was held the same day. The workshop featured talks by Paroda on the role of youth in Indian agriculture, Prasanna on modernizing maize breeding and enhancing genetic gain, CIMMYT scientist Vijay Chaikam on maize doubled haploid technology, and CIMMYT breeder Sudha Nair on genomic technologies for maize improvement.
IMIC-Asia held a General Body Meeting soon after the technical workshop, at which B.S. Vivek, maize breeder at CIMMYT, introduced the framework for the third phase of IMIC-Asia. Participants included representatives of the Indian Institute of Maize Research, the All-India Coordinated Maize Improvement Program, and private seed companies with membership in the consortium. Meeting participants expressed a keen interest in utilizing the new doubled haploid facility’s services.
