AID-I staff inspect germination in Malawi (Photo: CIMMYT)
Accelerated delivery with a difference is underway in Malawi, Tanzania, and Zambia to ensure access to stress-tolerant seeds for underserved farmers in remote areas. Supported by USAID, the Accelerated Innovation Delivery Initiative (AID-I) project brings public-private and civil society together to address the impacts of climate change, pests and diseases, and food shocks on maize and legume systems.
One simple and cost-effective solution to tackle these threats is last mile delivery of stress-tolerant and nutritious seeds. Ensuring that farmers have access to a diverse range of seeds means they can choose the best varieties to suit their needs and their local environment.
Through AID-I, scientists at the International Maize and Wheat Improvement Center (CIMMYT) are working with over 20 global, regional, national, and local partners to strengthen maize and legume seed systems in Malawi, Tanzania, and Zambia.
So far, in 2023, the team has set up over a hundred mega-demonstrations across Malawi and Zambia, to raise awareness and increase seed production by exposing communities to improved, climate-adapted and nutritious crop varieties. As learning centers, the mega-demonstrations give farmers a chance to see for themselves the advantages of improved maize and legume varieties and better farming practices including conservation agriculture and doubled up legumes systems.
Farmers plant mega-demonstration plots in Malawi (Photo: CIMMYT)
Spotlighted were drought-tolerant and nutritious varieties, expected to play a crucial role in the recovery of regional maize production. The Zambian and Malawian governments have also just released maize hybrids tolerant to fall armyworms, which will be scaled through the AID-I. The fall armyworm is an invasive pest that attacks more than 80 different crops but has a particular preference for maize. Without proper control measures, the pest can decimate crops, threatening food security, incomes, and livelihoods.
Alongside maize, the AID-I team is making seed of improved legume varieties, including beans, soybean, pigeon peas, cowpea, and groundnuts available at the last mile. Legumes are nutritious and good for the soil, providing valuable nutrients like nitrogen (N) so farmers can use less fertilizer, save money, and protect soil health.
AID-I supports strengthening of strategically located seed stockists of improved legume varieties and linking seed growers and buyers. These stockists, called agricultural development agents will also receive training in community seed production. Through connection with hundreds of agricultural development agents in the first farming season with seed suppliers, hundreds of thousands of farmers will be able to access a wide variety of improved seed.
Members of the CIMMYT leadership team with representatives from the U.S. Department of State and the U.S. Agency of International Development (USAID) visit AfriSeed in Zambia (Photo: CIMMYT)
Building strong relationships between public and private sector organizations is an integral part of the project. On January 16, 2023, long-term CIMMYT collaborator and AID-I key partner, AfriSeed hosted senior government officials from the United States Department of State (DOS) and U.S. Agency for International Development (USAID). The visitors gained valuable insight into how private seed companies involved in the marketing and distribution of maize and legume seeds operate in Zambia and showed their crucial role in the country’s seed sector.
Sieg Snapp, Tek Sapkota, and partners photographed during AIM for Climate (Photo: CIMMYT)
As climate change threats accelerate, new technologies, products, and approaches are required for smallholder farmers to mitigate and adapt to current and future threats. Targeting smallholder farmers will benefit not only the farmers but the entire agri-food system through enhanced locally relevant knowledge that harnesses handheld sensors and advisories on management options, soil status, weather, and market information.
The Agriculture Innovation Mission for Climate (AIM for Climate / AIM4C) seeks to address climate change and global hunger by uniting participants to significantly increase investment in, and other support for, climate-smart agriculture and food systems innovation over five years (2021–2025).
The International Maize and Wheat Improvement Center (CIMMYT), as a partner of AIM for Climate, organized a breakout session titled “Smart Smallholder Fertilizer Management to Address Food Security, Climate Change, and Planetary Boundaries” during the AIM for Climate Summit in Washington DC, May 8-10, 2023.
Fertilizers are essential for increasing crop yields and ensuring food security, yet fertilizer use for food and fodder is severely skewed at the global level, leading to over-fertilization in some regions and under-fertilization in others.
Farmers in low-income countries are highly vulnerable to fertilizer supply shortages and price spikes, which have direct consequences for food prices and hunger. Improving fertilizer efficiency and integrated organic and inorganic sources is important globally as nutrient loss to the environment from inappropriate input use drives greenhouse gas emissions and pollution.
Innovation Sprint
Because smallholder farmers are the primary managers of land and water, the CIMMYT-led AIM4C Innovation Sprint, Climate-Resilient soil fertility management by smallholders in Africa, Asia, and Latin America is designed to implement and scale-up a range of climate robust nutrient management strategies in 12 countries, and to reach tens of millions of smallholder farmers in close collaboration with nearly 100 public-private partners organizations.
Sieg Snapp called for more investments in data synthesis (Photo: CIMMYT)
Strategies include innovations in extension where digital tools enable farmer-centered private and public advisories to increase the uptake of locally adapted nutrient management practices. Connecting farmers to investors and markets provides financial support for improved nutrient management.
By tailoring validated fertility management practices to their specific conditions, and integrated use of legumes and manure, smallholders will optimize productivity, enhance climate resilience, and mitigate greenhouse gas emissions. Research from other organizations has determined that improved fertilizer management can increase global crop yield by 30% while reducing greenhouse gas emissions.
Right place, right time
“We need locally adapted fertilizer management approaches that work for smallholder farmers. By tailoring validated fertility management practices to their specific conditions, smallholders will optimize productivity, enhance climate resilience, and mitigate greenhouse gas emissions,” said Sieg Snapp, CIMMYT’s Sustainable Agricultural Systems Program Director. She continued, “What is needed now is major investment in data synthesis. Through this SPRINT we are exploring options to enable taking sensors to scale, to reach tens of millions of farmers with hyper-local soils information.”
Inequality is the core of the problem in fertilizer management: some regions apply more than the required amount, where in other regions fertilizer application is insufficient for plant needs, leading to low yields and soil degradation.
Tek Sapkota spoke on fertilizer management (Photo: CIMMYT)
“Fertilizer efficiency can be improved through application of the right amount of fertilizer using the right source employing the right methods of application at the right time of plant demand,” said Tek Sapkota, CIMMYT Senior Scientist, Agricultural System/Climate Change.
The session included presentations by the Foundation for Food & Agriculture Research (FFAR), UN Foundation, Pakistan Agricultural Research Council (PARC), Stockholm International Water Institute (SIWI), USDA, and Alliance of CIAT-Bioversity. Highlights sustainable and climate-smart practices in Pakistan, novel plant genetics for improved nitrogen cycling, and soil water and nutrient management in the Zambezi to tackle food security and climate change challenges.
Rising global temperatures due to climate change are changing the growth cycles of crops worldwide. Recent records from Europe show that wild and cultivated plants are growing earlier and faster due to increased temperatures.
Farmers also influence the timing of crops and tend to grow their crops when weather conditions are more favorable. With these periods shifting due to climate change, sowing calendars are changing over time.
Over thousands of years of domesticating and then breeding crops, humans have also managed to artificially change how crop varieties respond to both temperature and day length, and in turn have been able to expand the area where crop species can be grown. Farmers can now choose varieties that mature at different rates and adapt them to their environment.
Including farmers’ decisions on when to grow crops and which varieties to cultivate are vital ingredients for understanding how climate change is impacting staple crops around the world and how adaptation might offset the negative effects.
“For long time, the parametrization of global crop models regarding crop timing and phenology has been a challenge,” said Sara Minoli, first author of the study. “The publication of global calendars of sowing and harvest have allowed advancements in global-scale crop model and more accurate yield simulations, yet there is a knowledge gap on how crop calendars could evolve under climate change. If we want to study the future of agricultural production, we need models that can simulate not only crop growth, but also farmers’ management decisions.”
Using computer simulations and process-based models, the team projected the sowing and maturity calendars for five staple crops, maize, wheat, rice, sorghum and soybean, adapted to a historical climate period (1986–2005) and two future periods (2060–2079 and 2080–2099). The team then compared the crop growing periods and their corresponding yields under three scenarios: no adaptation, where farmers continue with historical sowing dates and varieties; timely adaptation, where farmers adapt sowing dates and varieties in response to changing climate; and delayed adaptation, where farmers delay changing their sowing dates and varieties by 20 years.
The results of the study, published last year in Nature Communications, revealed that sowing dates driven by temperature will have larger shifts than those driven by precipitation. The researchers found that adaptation could increase crop yields by 12 percent, compared to non-adaptation, with maize and rice showing the highest potential for increased crop yields at 17 percent. This in turn would reduce the negative impacts of climate change and increase the fertilization effect of increased levels of carbon dioxide (CO2) in the atmosphere.
They also found that later-maturing crop varieties will be needed in the future, especially at higher latitudes.
“Our findings indicate that there is space for maintaining and increasing crop productivity, even under the threat of climate change. Unfortunately, shifting sowing dates – a very low-cost measure – is not sufficient, and needs to be complemented by the adaptation of the entire cropping cycle through the use of different cultivars,” said Minoli.
Another important aspect of this study, according to Anton Urfels, CIMMYT systems agronomist and co-author of the study, is that it bridges the GxMxE (Gene-Management-Environment) spectrum by using crop simulations as an interdisciplinary tool to evaluate complex interactions across scientific domains.
“Although the modeled crops do not represent real cultivars, the results provide information for breeders regarding crop growth durations (i.e. the need for longer duration varieties) needed in the future as well as agronomic information regarding planting and harvesting times across key global climatic regimes. More such interdisciplinary studies will be needed to address the complex challenges we face for transitioning our food systems to more sustainable and resilient ones,” said Urfels.
Cover photo: Work underway at the International Maize and Wheat Improvement Center in Zimbabwe (CIMMYT), is seeking to ensure the widespread hunger in the country caused by the 2015/6 drought is not repeated, by breeding a heat and drought tolerant maize variety that can still grow in extreme temperatures. CIMMYT maize breeders used climate models from the CGIAR Research Program on Climate Change, Agriculture and Food Security (CCAFS) to inform breeding decisions. (Photo: L. Sharma/Marchmont Communications)
The Scaling Scan website has been launched offering the latest news, manuals, videos, trainings, a directory of consultants, and a forum to engage with peers and experts on how to use the Scaling Scan tool to support scaling processes.
The website, which was developed by Lennart Woltering, scaling advisor with the International Maize and Wheat Improvement Center (CIMMYT), and the Scaling team in CIMMYT, builds on the success of the Scaling Scan, a user-friendly tool designed for anyone to learn about scaling: appreciate that context is king, that innovations don’t scale alone, and that collaboration is key for success
“The idea behind the Scaling Scan has always been to make it accessible to users of all levels, to bring the discussion on scaling to the ground and therefore, just like the tool, the materials on the site are available in English, French, and Spanish,” said Woltering.
It features materials used in training programs and workshops by CIMMYT’s scaling team over the past five years, repurposing them neatly for users around the world to assess the scalability of their own pilot projects and innovations. The website also includes a forum where users can engage in conversations, exchange information, and ask experts and other users questions and advice related to scaling. The platform also acts as a conversation space, allowing users around the world to share their experiences with the Scaling Scan, ask questions, and learn from each other. This has the added benefit of helping the Scaling Scan team understand on the ground needs so that they can create more user-friendly content.
“The demand for Scaling Scan workshops has been overwhelming, within CIMMYT, the CGIAR, but also with development organizations like Catholic Relief Services and GIZ and the private sector and we realized that we should bank much more on its biggest asset: accessibility. So, in 2022 we started with trainings for facilitators and the website serves as the platform for them to draw inspiration, materials, and methodologies how to apply the Scaling Scan in their context,” said Woltering.
Scaling is a process that aims to achieve sustainable change at scale. This means that not only should many people benefit from a new technology, but the results of a particular project should carry over beyond its immediate context and transform communities for the better.
It’s a complex process, and there is no one single recipe or blueprint. The Scaling Scan can, however, give direction to scaling new projects and highlight key factors scaling teams need to look out for
“The Scaling Scan aims to provide a framework for people to understand how much they should scale, and what else should be taken into consideration, in addition to the technology, for the next steps in their scaling process,” said CIMMYT Scaling Coordinator Eva Marina Valencia Leñero. “It also intends to show that scaling is not only about focusing on where the innovation is ready or mature, but also whether there are enabling conditions – what we call scaling ingredients – surrounding this innovation that managers have to plan for if they want their innovation to last in the long-term.”
“Considering that the core of the tool was developed at a kitchen table with three people over two days with no funding, it is amazing that the tool has served more than 2,000 people in the last five years,” said Woltering. With support from GIZ, the Scaling Scan is now being digitized which allows for the development of different versions, for example one with more emphasis on social inclusion or on climate mitigation for the One CGIAR Low-Emission Food Systems (MITIGATE+) Initiative. The lessons from over five years of applying the Scaling Scan from rural areas in Honduras to Bangladesh are currently being written up.
Figuring out what kinds of crops and crop varieties farmers want – high yielding, disease resistant, drought tolerant, early maturing, consumer-preferred, nutritious etc. – is a crucial step in developing locally adapted, farmer-friendly and market preferred varieties as part of more sustainable seed grain sectors.
While scientists aim to develop the best crop varieties with multiple traits, there are always trade-offs to be made due to the limits of genetics or competing preferences. For example, a variety may be more tolerant to drought but perform less well in consumer taste preferences such as sweet grains, or it may be higher yielding but more vulnerable to pests and diseases. Some of these trade-offs, such as vulnerability to pests or adverse climate, are not acceptable and must be overcome by crop scientists. The bundle of traits a crop variety offers is often a major consideration for farmers and can be the difference between a bumper harvest and a harvest lost to pests and diseases or extreme weather conditions.
Economists from the International Maize and Wheat Improvement Center (CIMMYT) have been working with smallholder farmers across sub-Saharan Africa to document their preferences when it comes to maize. Results from Ethiopia were recently published in the journal PLOS ONE.
In a survey with almost 1,500 participants in more than 800 households, researchers found that both male and female farmers valued drought tolerance over other traits. For many farmers in areas where high-yielding, medium-maturing hybrids were available, early maturity was not considered a priority, and sometimes even disliked, as farmers felt it made their harvests more vulnerable to theft or increased their social obligations to share the early crop with relatives and neighbors if they were the only ones harvesting an early maize crop. Farmers therefore preferred varieties which matured more in sync with other farmers.
The team also found some gender differences, with female farmers often preferring taste over other traits, while male farmers were more likely to prioritize plant architecture traits like closed tip and shorter plants that do not easily break in the wind or bend over to the ground. These differences, if confirmed by ongoing and further research, suggest that gender differences in maize variety choices may occur due to differentiated roles of men and women in the maize value chains. Any differences observed should be traced to such roles where these are distinctly and socially differentiated. In aspects where men and women’s roles are similar — for example, when women express preferences in their role as farmers as opposed to being custodians of household nutrition — they will prioritize similar aspects of maize varieties.
The results of the study show that overall, the most important traits for farmers in Ethiopia, in addition to those that improve yields, are varieties that are drought and disease tolerant, while in taste-sensitive markets with strong commercial opportunities in green maize selling, farmers may prioritize varieties that satisfy these specific consumer tastes. The findings of the study also highlight the impact of the local social environment on variety choices.
By taking farmers’ preferences on board, maize scientists can help develop more sustainable maize cropping systems which are adapted to the local environment and respond to global climatic and economic changes driven by farmers’ and consumers’ priorities.
Harvesting maize cobs at KALRO Katumani Research Station in Machakos, Kenya. (Photo: Peter Lowe/CIMMYT)
Drought and striga tolerance come out top for Kenyan farmers
In related research from western Kenya, published in June 2022 in Frontiers in Sustainable Food Systems, results showed that farmers highly valued tolerance to drought, as well as tolerance to striga weed, low nitrogen soils and fall armyworm, in that order. CIMMYT researchers surveyed 1,400 smallholder farmers across three districts in western Kenya.
The scientists called for a more nuanced approach to seed markets, where seed prices might reflect the attributes of varieties. Doing so, they argue, would allow farmers to decide whether to pay price premiums for specific seed products thereby achieving greater market segmentation based on relative values of new traits.
“Both studies show that farmers, scientists and development experts in the maize sector are grappling with a wide array of demands,” said Paswel Marenya, CIMMYT senior scientist and first author of both studies.
“Fortunately, the maize breeding systems in CIMMYT, CGIAR and National Agricultural Research Systems (NARS) have produced a wide range of locally adapted, stress tolerant and consumer preferred varieties.”
The results of both these studies provide a framework for the kinds of traits scientists should prioritize in maize improvement programs at least in similar regions as those studied here in central Ethiopia or western Kenya. However, as Marenya noted, there is still work to do in supporting farmers to make informed choices: “The challenge is to implement rigorous market targeting strategies that sort and organize this complex landscape for farmers, thereby reducing the information load, search costs and learning times about new varieties. This will accelerate the speed of adoption and genetic gains on farmers’ fields as envisaged in this project.”
Banner for the refresher webinar on fall armyworm management in South Asia. (Photo: CIMMYT)
The fall armyworm is a destructive polyphagous pest that feeds on more than 300 crop species, with a particular appetite for maize. The pest was first reported in Asia in 2018 and has been spreading in the region since then, especially in maize-producing countries of South Asia.
Several campaigns on identifying and managing fall armyworm have been conducted in South Asia, yet the challenge to control the pest remains. The damage caused by fall armyworm to farmers’ fields was reported widely during the 2022 spring maize season in Pakistan and Nepal’s Terai region. Many maize farmers complained about the current economic downturn, price hike of agricultural commodities and the unavailability of safe pesticides to reduce crop losses.
On 21 July 2022, the International Maize and Wheat Improvement Center (CIMMYT) initiated a refresher webinar to share the latest scientific advances and best practices for identifying and managing fall armyworm in South Asia. The platform extended an opportunity for the participants to understand and learn about effective integrated pest management (IPM) approaches being practiced in the region. It also addressed the importance of enabling policies that are crucial to foster innovations to reduce crop yield loss and save the environment from hazardous effects of toxic pesticides.
The Nepal Seed and Fertilizer Project (NSAF) team, supported by the United States Agency for International Development (USAID) and implemented by CIMMYT, organized the virtual event in collaboration with Nepal’s Plant Quarantine and Pesticide Management Center, the Nepal Agricultural Research Council, Nepal’s National Maize Research Program, the Maize and Millet Research Institute in Pakistan, the University of Agriculture Faisalabad and CGIAR’s Plant Health Initiative.
Govinda Prasad Sharma, Secretary of Nepal’s Ministry of Agriculture and Livestock Development and Jason Seuc, director of the Economic Growth Office at USAID Nepal, delivered their opening remarks during the inaugural session. The Secretary emphasized the use of safer methods, including but not limited to mass rearing and releasing of natural enemies of fall armyworm and the deployment of fall armyworm tolerant maize varieties.
“USAID will continue working with partners to advocate and promote IPM practices till the pest becomes of non-economic importance,” said Seuc.
BM Prasanna, director of CIMMYT’s Global Maize Program and OneCGIAR Plant Health Initiative lead emphasized the importance of IPM practices to manage the pest. Prasanna discussed the global efforts to control the pest and shared the progress of fall armyworm tolerant maize seeds which are being released and deployed by CIMMYT partners to help resource poor farmers, especially in Africa.
AbduRahman Beshir, NSAF’s seed systems lead, emphasized the importance of the event and acknowledged the participation of approximately 525 attendees from public and private research institutions, academicians, civil society, private sector, policy decision-makers, CGIAR centers and USAID Nepal. The webinar gathered attendees from 15 countries, including Nepal, India, Bangladesh, Pakistan, Thailand, Myanmar, Sri Lanka and China.
Experts from South Asia presented on a range of topics including the status of fall armyworm and its management in Nepal, Pakistan, Bangladesh and the Pacific Region, IPM practices and experience of using safe pesticides, breeding for native genetic resistance to fall armyworm, and biological control and push-pull strategies. The experts emphasized on the need for collective efforts to strengthen national and international coordination, favorable policies, deployment of fall armyworm tolerant maize varieties, and best response interventions to help farmers battle the fall armyworm and limit its spread.
Efforts to mitigate the impact of fall armyworm attacks are still ongoing. CIMMYT is continuously working to alert farmers and stakeholders on the IPM practices of fall armyworm in the region.
Govinda Prasad Sharma, Secretary of Nepal’s Ministry of Agriculture and Livestock Development hands-over diverse maize seed inbred lines acquired by CIMMYT to the National Agricultural Research Council. (Photo: Bandana Pradhan/CIMMYT)
Maize is Nepal’s second most important crop for food security. Although the country’s diverse ecology can support maize production throughout the year, maize seeds and other grains, are largely imported each year.
Access to quality maize seed is one of the issues. Almost 85% of Nepalese farmers are unable to access quality certified maize seeds leaving them vulnerable to lower productivity. Traditional seeds, for example, are often unable to withstand extreme weather conditions induced by climate change. Nepal also has low seed replacement rates — around 20% for major cereals, which means that over 80% of farmers are either recycling seeds or use substandard quality seeds for each cropping season.
Over the past four years, researchers from the International Maize and Wheat Improvement Center (CIMMYT), through Nepal Seed and Fertilizer (NSAF) project supported by the United States Agency for International Development (USAID), have been assisting the National Agricultural Research Council (NARC) and private seed company partners to test market ready and multiple stress tolerant hybrid and synthetic maize varieties at various locations across Nepal and evaluate their suitability for cultivation. These maize varieties have come from CIMMYT’s maize breeding hubs in Mexico, Zimbabwe, Colombia and India as well as the International Institute of Tropical Agriculture (IITA).
After over two years of testing and identifying the best performing varieties, Secretary of the Ministry of Agriculture and Livestock Development, Govinda Prasad Sharma handed over the seeds of selected maize varieties to NARC and seven partner seed companies for further testing, variety registration and seed scale up in Nepal. The handover ceremony took place on August 18, 2022 at the Quality Hybrid Seed Production and Seed Business Management International Training Workshop, which gathered together a diverse range of maize stakeholders from Nepal and South Asia.
These new high-performing, climate-resilient varieties will help Nepal increase their national maize yield, enhancing food security and livelihoods.
Govinda Prasad Sharma, Secretary of Nepal’s Ministry of Agriculture and Livestock Development hands over diverse maize seed inbred lines acquired by CIMMYT to one of the private seed company partners of the NSAF project. (Photo: Bandana Pradhan/CIMMYT)
Nutritious and climate resilient
The maize seeds include varieties enriched with provitamin A and zinc, aflatoxin tolerant synthetics, white and yellow kernel hybrids, and sweet and popcorn maize varieties. As well as being good for nutrition, the seeds are high yielding. Synthetic varieties have the potential to yield 6-7 metric tons (t) per hectare, while the hybrid varieties may yield over 10t — a significant increase from 3-5t of local seeds.
Climate change resilience is a vital trait for modern crops. Climate change is posing a threat to crops, with traditional varieties often unable to withstand extreme weather conditions. Included in the handover were climate resilient, early maturing seeds which take less than 100 days to mature in the summer season, reducing their exposure to drought. Among the handed over seeds were varieties tolerant to fall armyworm — a devastating pest threatening maize production in Nepal.
Stress tolerant and high yielding varieties suitable for such extreme conditions are needed now more than ever to increase on-farm yield levels. Nepal also needs a vibrant last mile seed delivery system and mechanisms to support and serve under-reached populations, including women and smallholder farmers. Sharma acknowledged CIMMYT’s support in sharing these elite and diverse maize seeds, which will contribute towards the government’s efforts of self-sufficiency in major cereals including maize.
“USAID is pleased to be collaborating with both the Government of Nepal and private sector partners through the NSAF project to enhance maize production and productivity at the farmer level,” said Jason Seuc, director of the Economic Growth Office at USAID.
“Once the range of maize seeds become widely available in the market, these varieties will play a major role in enhancing the food and nutrition security to millions of farmers who use maize directly or indirectly in the food chain, especially for those living in the hills.”
The exclusive allocation of the new products to partners complements the project team’s efforts to support private seed companies who have recently acquired research and development licenses and can subsequently register varieties under their own brands.
“We are handing over not only seeds and technologies to our partners but also responsibility, so that these varieties can make it to the farmers’ field in the shortest time possible,” said AbduRahman Beshir, NSAF’s seed systems lead at CIMMYT.
This crucial initiation also supports Nepal’s efforts to compete with imports and promote self-sufficiency through the private sector-led hybrid seed industry. Ultimately, farmers will have better access to quality maize seeds and increase crop productivity and income.
A systematic review conducted by a team of scientists from the International Maize and Wheat Improvement Center (CIMMYT) has revealed that many farmers around the world incorrectly identify their crop varieties, with significant impacts on their farming practices, yields, profits, and research.
The review, published this month in Outlook on Agriculture, brings together information from 23 published studies to sketch crop variety misclassification among farmers, its determinants, and the implications of classification errors on the farm and in research.
“We found that seven out of ten farmers incorrectly identified the grown variety when they were asked to identify the variety by its specific name. When farmers were asked if the grown variety was either improved or local, three out of ten farmers made incorrect classifications,” said Michael Euler, first author of the study and agricultural resource economist at CIMMYT.
Whether farmers correctly identify crop varieties has a knock-on effect on their farming practices, which in turn affects their crop yields and income. This can bleed into research, impacting experiments and evaluation studies of agricultural technologies and methods. For example, scientists might assign treatment and control groups based on incorrect farmer variety classification, potentially leading to biased estimates and data discrepancies.
“Varietal misidentification can lead to improper agronomic management, forgone farm revenue, and seed system malfunctioning. From a monitoring and evaluation perspective, the potential presence of bias in estimates due to varietal misclassification is problematic as it may mask the true costs and benefits of seed technologies,” said Euler.
Immature wheat seeds. Ciudad Obregon, Mexico 2017. (Photo: Peter Lowe/CIMMYT)
The study is the first systematic review of the use of DNA fingerprinting – a method that uses molecular markers to identify crop varieties – to assess how accurate farmers are in identifying their varieties and the impacts this has on seed markets, crop performance, farm profits, and research.
“The use of DNA fingerprinting to identify crop varieties in farmers’ fields has emerged only recently. The review of existing literature, nonetheless, shows its potential to strengthen the functioning and effectiveness of seed markets, supply chains, and extension services,” said Vijesh Krishna, co-author of the study and senior scientist at CIMMYT.
The results of the review show that cases of farmers misidentifying varieties are widespread, causing problems for farm productivity and profits, as well as research. The authors also found that DNA fingerprinting can shed light on what drives farmers to misidentify varieties and how they can minimize misclassification.
“Varietal misidentification is not only related to farmer and farm characteristics but also depends on the properties of the seed system through which seeds are obtained. We need more comprehensive modeling approaches to improve our understanding of the system-level drivers of farmer varietal misclassification,” said co-author and CIMMYT senior agricultural economist Moti Jaleta.
However, like most technologies, DNA fingerprinting has its limitations. It may not always be feasible in all settings, and the costs may offset the benefits in areas where formal seed markets are already well-functioning.
“DNA fingerprinting is considered a reliable method to accurately identify varieties grown by farmers and is increasingly seen as the ‘gold standard’ for varietal identification. However, it requires a high-quality reference library, a well-designed sampling strategy, and accurate tracking of plant samples from collection sites to the point of analysis,” said CIMMYT senior scientist and co-author David Hodson.
Based on the results of the analysis, the authors recommend integrating DNA fingerprinting into existing national data collection toolboxes to accurately estimate adoption and turnover rates of improved crop varieties and to evaluate existing genetic crop diversity on farms. Understanding and promoting genetic crop diversity are crucial steps for enhancing food security and increasing the climate and pest and disease resilience of crops.
Having accurate estimates of adoption and turnover rates of varieties, combined with seed supply system assessment, can also help researchers and decision-makers pinpoint any bottlenecks or loopholes in the “lab to farm” process, according to the authors.
“The review aims at helping researchers and policymakers strategize to more effectively assess the functioning and effectiveness of seed diffusion systems to deliver modern seeds to smallholders,” concluded Krishna.
Farmers gather in a landrace field. Photo: Raqib Lodin/CIMMYT
For thousands of years, farmers in Afghanistan, Turkey and other countries in the region, have been breeding wheat, working closely with the environment to develop traditional wheat varieties known as landraces. Untouched by scientific breeding, landraces were uniquely adapted to their environment and highly nutritious.
As agriculture became more modernised and intensified, it threatened to push these traditional landraces into extinction, resulting in the loss of valuable genetic diversity. Institutions around the world decided to act, forming germplasm collections known as genebanks to safely house these landraces.
In 2009, a team of wheat scientists from the International Maize and Wheat Improvement Center (CIMMYT), the International Center for Agricultural Research in the Dry Areas (ICARDA), the UN Food and Agriculture Organization (FAO), and national partners set off on a five-year expedition across Central Asia to collect as many landraces as they could find. The project, led by FAO Cereal Breeder and former CIMMYT Principal Scientist Alexey Morgunov, was made possible by the International Treaty on Plant Genetic Resources for Food and Agriculture Benefit-Sharing Fund.
The project had two main missions. The first is to preserve landrace cultivation in three countries, Afghanistan, Turkey and other countries in the region by selecting, purifying, and multiplying the landraces and giving them back to farmers. The second is to scientifically evaluate, characterize and use these landrace varieties in ongoing breeding programmes, exchange the information between the countries, and to deposit the seeds in genebanks to safely preserve them for future generations.
The latest results from the project were published in July in the journal Crops. The study, authored by a team of experts from CIMMYT, ICARDA, FAO, and research institutes in Afghanistan, Turkey and other countries in the region, compared the diversity, performance, and adaptation of the collected wheat landraces with modern varieties grown in the regions using a series of field experiments and cutting-edge genomic tools.
“Landraces are very useful from a breeding perspective because they have been cultivated by farmers over thousands of years and are well adapted to climate change, have strong resistance to abiotic stresses and have very good nutritional quality,” said Rajiv Sharma, a CIMMYT senior scientist and co-author of the paper.
“We were interested in seeing how well landraces adapt to certain environments, how they perform agronomically, and whether they are more diverse than modern varieties grown in these regions – as well as give their improved versions back to farmers before they are lost.”
The experiments, which were carried out in 2018 and 2019 in Turkey, and 2019 in Afghanistan, and other countries in the region revealed several physical characteristics in landraces which are no longer present in modern varieties. For example, the team found striking differences in spike and grain colors with landraces more likely to have red spikes and white grains, and modern varieties tending to have white spikes and red grains. This may have adaptive values for high altitudes and dry conditions.
A surprising finding from the study, however, was that landraces were not more genetically diverse than modern landraces.
“Many people thought that when we went from cultivating landraces to modern varieties, we lost a lot of diversity but genetically speaking, that’s not true. When you look at the genomic profile, modern varieties are just as diverse as landraces, maybe even a little bit more so,” said Sharma.
When the team compared landraces and modern varieties on crop performance, the results were mixed with modern wheat varieties outyielding landraces in half of the environments tested. However, they found that the highest yielding landraces were just as good as the best modern varieties – a reassuring finding for farmers concerned about the productivity of their crops.
A new breeding paradigm
The results of the study have important implications for landrace conservation efforts in farmers’ fields and in future breeding strategies. While crossing wheat landraces with modern varieties to develop improved modern varieties is not new, the authors proposed a novel alternative breeding strategy to encourage the continued cultivation of landraces: improving landraces by crossing them with other landraces.
“In order to maintain landraces, we have to make them competitive and satisfy farmers’ needs and requirements. One option is that we breed landraces,” said Sharma.
“For example, you might have a landrace that is very-high yielding but susceptible to disease. By crossing this variety with another landrace with disease-resistant traits you can develop a new landrace better suited to the farmer and the environment. This approach maintains all the features of landraces – we are simply accelerating the evolution process for farmers to replace the very fast disappearance of these traditional varieties.”
This approach has already been used by crop scientists at the University of California, Davis who has successfully developed and registered “heirloom-like varieties” of dry beans. The varieties trace about 98% of their ancestry to landraces but are resistant to the common mosaic virus.
Heirloom food products are becoming increasingly popular with health-conscious consumers who are willing to pay a higher price for the products, garnering even more interest in conserving traditional landraces.
One of the overarching aims of the project was to give wheat landraces back to farmers and let nature take its course. Throughout the mission, the team multiplied and returned landrace seed to over 1500 farmers in communities across Afghanistan, Turkey and other countries in the region. The team also supplied over 500 farmers with improved landrace seed between 2018 and 2019.
Despite the political turmoil facing these countries, particularly Afghanistan, farmers are still growing wheat and the project’s contribution to food security will continue.
These landraces will take their place once more in the farming landscape, ensuring on-farm wheat diversity and food security for future generations.
This research was conducted with the financial assistance of the European Union within the framework of the Benefit-Sharing Fund project “W2B-PR-41-TURKEY” of the FAO’s International Treaty on Plant Genetic Resources for Food and Agriculture.
There is growing awareness that not all rural women are alike and that social norms and technological interventions affect women from different castes in distinct ways. The caste system in South Asia, which dates back over 3,000 years, divides society into thousands of hierarchical, mostly endogamous groups. Non-marginalized castes are classified as “general caste” while those living in the social margins are categorized as “scheduled caste” and “scheduled tribe”. Scheduled caste and scheduled tribe farmers face both social and economic marginalization and limited access to information and markets, despite government efforts to level up social inequalities.
In India, women of all castes are involved in farming activities, although their caste identity regulates the degree of participation. General caste women are less likely to be engaged in farming than women of lower castes. Despite their level of participation across caste groups, women are rarely recognized as “farmers” (Kisan) in Indian rurality, which restricts their access to inputs, information and markets.
Gender experts from the International Maize and Wheat Improvement Center (CIMMYT) and partners investigated caste-gender relations among wheat farmers in Madhya Pradesh, India’s second-largest state by area. The team conducted focus group discussions and interviews in a village community, and carried out a review of GENNOVATE research in the same area. The team also carried out a survey involving about 800 wheat farmers from 18 village communities across the state.
Women work in the fields in India’s Madhya Pradesh state. Our study found that women are involved in all aspects of agricultural work on family farms. (Photo: CIMMYT)
The study, published last month in Gender, Technology, and Development, revealed five key findings:
First, caste distinctions are sharp. There is little interaction between women and men farmers from the scheduled caste category — even between subcastes in this category — and other castes. They live in separate enclaves, and land belonging to scheduled caste farmers is less fertile than others.
Second, all women are fully involved in all aspects of agricultural work on the family farm throughout the year.
Third, despite their strong participation in farming activities, women across caste groups are normatively excluded from agricultural decision-making in the household. Having said that, the findings were very clear that some individual women experience greater participation than others. Although women are excluded from formal agricultural information networks, they share knowledge with each other, particularly within caste groups.
Fourth, about 20 years ago, women across caste groups were being employed as hired agricultural laborers. Over the past four years, increasing mechanization is pushing many women off the field. While scheduled caste women compensate for the employment loss to a certain degree by participating in non-farm activities, general caste women are not able to move beyond the village and secure work elsewhere due to cultural norms. Women therefore face a collapse in their autonomy.
Fifth, gender poses a greater constraint than caste in determining an individual’s ability to make decisions about farm and non-farm related activities. However, a significant difference exists across the caste groups, presenting a strong case for intersectionality.
Challenging social norms in agriculture
The results of the study show that caste matters in the gendered evaluations of agricultural technologies and demonstrates the importance of studying women’s contributions and roles in wheat farming in South Asia.
Agriculture in India is also considered to be broadly feminizing, with men increasingly taking up off-farm activities, leaving women to as primary cultivators on family fields and as hired laborers. However, rural advisory services, policy makers, and other research and development organizations are lagging behind in recognizing and reacting appropriately to these gendered changes. Many still carry outdated social norms which view men as the main decision-makers and workers on farms.
Funding for this study was provided by the Collaborative Platform for Gender Research under the CGIAR Program on Policies, Institutions, and Markets as well as the International Development Research Center of the Government of Canada, the CGIAR Research Programme on Wheat (CRP WHEAT https://wheat.org/), CIMMYT and the Indian Council of Agricultural Research (ICAR). The paper additionally drew on GENNOVATE data collected in India in 2015–16 with financial support from CRP WHEAT. Development of the GENNOVATE research methodology was supported by the CGIAR Gender and Agricultural Research Network, the World Bank, and the CRP WHEAT and CRP MAIZE, and data analysis was supported by the Bill and Melinda Gates Foundation.
Cover photo: A woman harvests wheat in Madhya Pradesh, India. (Photo: CIMMYT)
A farmer harvests wheat in one of CIMMYT’s research plots in Ethiopia. (Photo: P. Lowe/CIMMYT)
Five international wheat research teams have been awarded grants for their proposals to boost climate resilience in wheat through discovery and development of new breeding technologies, screening tools and novel traits.
Wheat is one of the world’s most important staple crops, accounting for about 20% of all human calories and protein and is increasingly threatened by the impacts of climate change. Experts around the world are working on ways to strengthen the crop in the face of increasing heat and drought conditions.
The proposals were submitted in response to a call by the Heat and Drought Wheat Improvement Consortium (HeDWIC), led by the International Maize and Wheat Improvement Center (CIMMYT) and global partners, made in 2021.
The grants were made possible by co-funding from the Foundation for Food & Agriculture Research (FFAR) and in-kind contributions from awardees as part of a project which brings together the latest research from scientists across the globe to deliver climate resilient wheat to farmers as quickly as possible.
Cutting-edge wheat research
Owen Atkin, from the Centre for Entrepreneurial Agri-Technology at the Australian National University, leads the awarded project “Discovering thermally stable wheat through exploration of leaf respiration in combination with photosystem II capacity and heat tolerance.”
“The ratio of dark respiration to light and CO2 saturated photosynthesis is a clear indicator of the respiratory efficiency of a plant,” Atkin said. “We will measure and couple this indicator of respiratory efficiency to the leaf hyperspectral signature of field grown wheat exposed to heat and drought. The outcome could be a powerful tool which is capable of screening for wheat lines that are more productive when challenged with drought and heatwave.”
Hannah M. Schneider, of Wageningen University & Research, leads the awarded project examining the use of a novel root trait called Multiseriate Cortical Sclerenchyma to increase drought-tolerance in wheat.
“Drought is a primary limitation to global crop production worldwide. The presence of small outer cortical cells with thick, lignified cell walls (MCS: Multiseriate Cortical Sclerenchyma) is a novel root trait that has utility in drought environments,” Schneider said. “The overall objective of this project is to evaluate and develop this trait as a tool to improve drought resistance in wheat and in other crops.”
An improved wheat variety grows in the field in Islamabad, Pakistan. (Photo: A. Yaqub/CIMMYT)
John Foulkes, of the University of Nottingham, leads an awarded project titled “Identifying spike hormone traits and molecular markers for improved heat and drought tolerance in wheat.”
“The project aims to boost climate-resilience of grain set in wheat by identifying hormone signals to the spike that buffer grain set against extreme weather, with a focus on cytokinin, ABA and ethylene responses,” Foulkes said. “This will provide novel phenotyping screens and germplasm to breeders, and lay the ground-work for genetic analysis and marker development.”
Erik Murchie, from the University of Nottingham, leads an awarded project to explore new ways of determining genetic variation in heat-induced growth inhibition in wheat.
“High temperature events as part of climate change increasingly limit crop growth and yield by disrupting metabolic and developmental processes. This project will develop rapid methods for screening growth and physiological processes during heat waves, generating new genetic resources for wheat,” Murchie said.
Eric Ober of the National Institute of Agricultural Botany in the UK, leads the awarded project “Targeted selection for thermotolerant isoforms of starch synthase.”
“Wheat remains a predominant source of calories and is fundamental to regional food security around the world. It is urgent that breeders are equipped to produce new varieties with increased tolerance to heat and drought, two stresses that commonly occur together, limiting grain production. The formation and filling of grain depends on the synthesis of starch, but a key enzyme in the pathway, starch synthase, is particularly sensitive to temperatures over 25°C. However, there exist forms of this enzyme that exhibit greater thermotolerance than that found in most current wheat varieties,” Ober said. “This project aims to develop a simple assay to screen diverse germplasm for sources of more heat-resistant forms of starch synthase that could be bred into new wheat varieties in the future.”
Breakthroughs from these projects are expected to benefit other crops, not just wheat. Other benefits of the projects include closer interaction between scientists and breeders and capacity building of younger scientists.
Two new students have graduated from the International Maize and Wheat Improvement Center’s (CIMMYT’s) Soil-Borne Pathogens program. The two new graduates, Khawla Mehalaine and Salah-Eddine Laasli, were supervised by CIMMYT senior scientist Abdelfattah Dababat.
He leads the Soil-Borne Pathogens program, which focuses on identifying the main soil-borne pathogens associated with cereals and developing an integrated pest management approach to combat them. The research team is particularly interested in finding novel sources of resistance against these pathogens.
Over the last two decades, CIMMYT scientists leading the Soil-Borne Pathogens program have trained tens of students which constitute the next generation of top researchers on this topic. Through this program, CIMMYT has also organized workshops and courses in North Africa, including a symposium on cereal nematodes held in Agadir, Morocco, in 2017.
Since soil-borne pathogens are exacerbated by water stress conditions, researchers have identified the Central and West Asia and North Africa regions as priority areas, due to their vulnerability to drought.
On March 1, 2021, Syngenta, in collaboration with CIMMYT and other partners, led the first One Earth Soil and Root Health Forum, an event which examined the importance of root and soil health to food security, climate resilience and livelihoods. The event also created a community for action on root and soil health.
Khawla Mehalaine celebrates graduating from her PhD. (Photo: handout)
Nematodes in Algeria
Mehalaine holds an engineering degree in agronomy and a master’s degree in plant protection from the Higher National School of Agronomy (ENSA) in Algeria. She successfully defended her PhD dissertation “Studies of cereal cyst nematodes of the genus Heterodera in the regions of northern Algeria” in June 2021, graduating from ENSA with honors.
She studied the behavior of four durum wheat varieties against cereal cyst nematodes through field surveys, molecular identification at species levels, and by evaluating the yield components of these wheat varieties.
She was promoted by ENSA professor Hammach M. and supervised by Dababat from CIMMYT, and professors Mustafa Imren and Göksel Özer from Abant Izzet Baysal University in Turkey.
“Completing my doctorate was a truly enriching experience and a challenging but rewarding journey,” Mehalaine said. “It was a collective effort and I am extremely grateful to Dr Abdelfattah Dababat for sharing his scientific skills, for his patience and support, and for all the opportunities I was given to further my research. Thanks to him, I got to know the world of nematodes. Special thanks to CIMMYT for funding the molecular study part.”
Salah-Eddine Laasli on his graduation day. (Photo: handout)
Root-lesion nematode and crown rot fungi
Laasli graduated with an International Master of Agronomic and Environmental Nematology (IMANEMA) from Ghent University, in collaboration with CIMMYT, the National Institute of Agricultural Research in Morocco and the Faculty of Agriculture at Abant Izzet Baysal University in Turkey.
His master thesis, entitled “Interaction of Root-Lesion Nematode (Pratylenchus thornei) and Crown Rot fungi (Fusarium culmorum) associated with wheat resistance under simulated field conditions,” was promoted by Wim Bert, a professor at the University of Ghent, and Dababat. The project was also supervised by Imren and Özer.
Laasli evaluated the host status of 150 spring wheat lines to both P. thornei and F. culmorum, and estimated the damage caused by the disease complex involving both pathogens at different infection scenarios. He found several lines that possessed multiple resistance to both diseases tested — which could be powerful sources of resistance for breeding program worldwide.
Cover photo: Irrigated wheat field. (Photo: S. Sukumaran/CIMMYT)
With the past decade identified as the warmest on record and global temperatures predicted to rise by as much as 2 degrees Celsius over preindustrial levels by 2050, the world’s staple food crops are increasingly under threat.
A new review published this month in the Journal of Experimental Botany describes how researchers from the International Maize and Wheat Improvement Center (CIMMYT) and collaborators are boosting climate resilience in wheat using powerful remote sensing tools, genomics and big data analysis. Scientists are combining multiple approaches to explore untapped diversity among wheat genetic resources and help select better parents and progeny in breeding.
The review — authored by a team of 25 scientists from CIMMYT, Henan Agricultural University, the University of Adelaide and the Wheat Initiative — also outlines how this research can be harnessed on a global level to further accelerate climate resilience in staple crops.
“An advantage of understanding abiotic stress at the level of plant physiology is that many of the same tools and methods can be applied across a range of crops that face similar problems,” said first author and CIMMYT wheat physiologist Matthew Reynolds.
Abiotic stresses such as temperature extremes and drought can have devastating impacts on plant growth and yields, posing a massive risk to food security.
Harnessing research across a global wheat improvement network for climate resilience: research gaps, interactive goals, and outcomes.
Addressing research gaps
The authors identified nine key research gaps in efforts to boost climate resilience in wheat, including limited genetic diversity for climate resilience, a need for smarter strategies for stacking traits and addressing the bottleneck between basic plant research and its application in breeding.
Based on a combination of the latest research advances and tried-and-tested breeding methods, the scientists are developing strategies to address these gaps. These include:
Using big data analysis to better understand stress profiles in target environments and design wheat lines with appropriate heat and drought adaptive traits.
Exploring wheat genetic resources for discovery of novel traits and genes and their use in breeding.
Accelerating genetic gains through selection techniques that combine phenomics with genomics.
Crowd-sourcing new ideas and technologies from academia and testing them in real-life breeding situations.
These strategies will be thoroughly tested at the Heat and Drought Wheat Improvement Network (HeDWIC) Hub under realistic breeding conditions and then disseminated to other wheat breeding programs around the world facing similar challenges.
One factor that strongly influences the success and acceleration of climate resilience technologies, according to Reynolds, is the gap between theoretical discovery research and crop improvement in the field.
“Many great ideas on how to improve climate-resilience of crops pile up in the literature, but often remain ‘on the shelf’ because the research space between theory and practice falls between the radar of academia on the one hand, and that of plant breeders on the other,” Reynolds explained.
Translational research — efforts to convert basic research knowledge about plants into practical applications in crop improvement — represents a necessary link between the world of fundamental discovery and farmers’ fields and aims to bridge this gap.
Main research steps involved in translating promising technologies into genetic gains (graphical abstract, adapted from Reynolds and Langridge, 2016). Reprinted under licence CC BY-NC-ND.
The impacts of this research, conducted under HeDWIC — a project led by CIMMYT in partnership with experts around the world — will be validated on a global scale through the International Wheat Improvement Network (IWIN), with the potential to reach at least half of the world’s wheat-growing area.
The results will benefit breeders and researchers but, most importantly, farmers and consumers around the world who rely on wheat for their livelihoods and their diets. Wheat accounts for about 20% of all human calories and protein, making it a pillar of food security. For about 1.5 billion resource-poor people, wheat is their main daily staple food.
With the world population projected to rise to almost ten billion by 2050, demand for food is predicted to increase with it. This is especially so for wheat, being a versatile crop both in terms of where it can grow and its many culinary and industrial uses. However, current wheat yield gains will not meet 2050 demand unless serious action is taken. Translational research and strategic breeding are crucial elements in ensuring that research is translated into higher and stable yields to meet these challenges.
Scientists at the International Maize and Wheat Improvement Center (CIMMYT) have been harnessing the power of drones and other remote sensing tools to accelerate crop improvement, monitor harmful crop pests and diseases, and automate the detection of land boundaries for farmers.
A crucial step in crop improvement is phenotyping, which traditionally involves breeders walking through plots and visually assessing each plant for desired traits. However, ground-based measurements can be time-consuming and labor-intensive.
This is where remote sensing comes in. By analyzing imagery taken using tools like drones, scientists can quickly and accurately assess small crop plots from large trials, making crop improvement more scalable and cost-effective. These plant traits assessed at plot trials can also be scaled out to farmers’ fields using satellite imagery data and integrated into decision support systems for scientists, farmers and decision-makers.
Here are some of the latest developments from our team of remote sensing experts.
An aerial view of the Global Wheat Program experimental station in Ciudad Obregón, Sonora, Mexico (Photo: Francisco Pinto/CIMMYT)
Measuring plant height with high-powered drones
A recent study, published in Frontiers in Plant Science validated the use of drones to estimate the plant height of wheat crops at different growth stages.
The research team, which included scientists from CIMMYT, the Federal University of Viçosa and KWS Momont Recherche, measured and compared wheat crops at four growth stages using ground-based measurements and drone-based estimates.
The team found that plant height estimates from drones were similar in accuracy to measurements made from the ground. They also found that by using drones with real-time kinematic (RTK) systems onboard, users could eliminate the need for ground control points, increasing the drones’ mapping capability.
Recent work on maize has shown that drone-based plant height assessment is also accurate enough to be used in maize improvement and results are expected to be published next year.
A map shows drone-based plant height estimates from a maize line trial in Muzarabani, Zimbabwe. (Graphic: CIMMYT)
Advancing assessment of pests and diseases
CIMMYT scientists and their research partners have advanced the assessment of Tar Spot Complex — a major maize disease found in Central and South America — and Maize Streak Virus (MSV) disease, found in sub-Saharan Africa, using drone-based imaging approach. By analyzing drone imagery, scientists can make more objective disease severity assessments and accelerate the development of improved, disease-resistant maize varieties. Digital imaging has also shown great potential for evaluating damage to maize cobs by fall armyworm.
Scientists have had similar success with other common foliar wheat diseases, Septoria and Spot Blotch with remote sensing experiments undertaken at experimental stations across Mexico. The results of these experiments will be published later this year. Meanwhile, in collaboration with the Federal University of Technology, based in Parana, Brazil, CIMMYT scientists have been testing deep learning algorithms — computer algorithms that adjust to, or “learn” from new data and perform better over time — to automate the assessment of leaf disease severity. While still in the experimental stages, the technology is showing promising results so far.
CIMMYT researcher Gerald Blasch and EIAR research partners Tamrat Negash, Girma Mamo and Tadesse Anberbir (right to left) conduct field work in Ethiopia. (Photo: Tadesse Anberbir)
Improving forecasts for crop disease early warning systems
CIMMYT scientists, in collaboration with Université catholique de Louvain (UCLouvain), Cambridge University and the Ethiopian Institute of Agricultural Research (EIAR), are currently exploring remote sensing solutions to improve forecast models used in early warning systems for wheat rusts. Wheat rusts are fungal diseases that can destroy healthy wheat plants in just a few weeks, causing devastating losses to farmers.
Early detection is crucial to combatting disease epidemics and CIMMYT researchers and partners have been working to develop a world-leading wheat rust forecasting service for a national early warning system in Ethiopia. The forecasting service predicts the potential occurrence of the airborne disease and the environmental suitability for the disease, however the susceptibility of the host plant to the disease is currently not provided.
CIMMYT remote sensing experts are now testing the use of drones and high-resolution satellite imagery to detect wheat rusts and monitor the progression of the disease in both controlled field trial experiments and in farmers’ fields. The researchers have collaborated with the expert remote sensing lab at UCLouvain, Belgium, to explore the capability of using European Space Agency satellite data for mapping crop type distributions in Ethiopia. The results will be also published later this year.
CIMMYT and EIAR scientists collect field data in Asella, Ethiopia, using an unmanned aerial vehicle (UAV) data acquisition. (Photo: Matt Heaton)
Delivering expert irrigation and sowing advice to farmers phones
The project has now ended, with the team delivering a webinar to farmers last October to demonstrate the app and its features. Another webinar is planned for October 2021, aiming to engage wheat and maize farmers based in the Yaqui Valley in Mexico.
CIMMYT researcher Francelino Rodrigues collects field data in Malawi using a UAV. (Photo: Francelino Rodrigues/CIMMYT)
Detecting field boundaries using high-resolution satellite imagery
In Bangladesh, CIMMYT scientists have collaborated with the University of Buffalo, USA, to explore how high-resolution satellite imagery can be used to automatically create field boundaries.
Many low and middle-income countries around the world don’t have an official land administration or cadastre system. This makes it difficult for farmers to obtain affordable credit to buy farm supplies because they have no land titles to use as collateral. Another issue is that without knowing the exact size of their fields, farmers may not be applying to the right amount of fertilizer to their land.
Using state of the art machine learning algorithms, researchers from CIMMYT and the University of Buffalo were able to detect the boundaries of agricultural fields based on high-resolution satellite images. The study, published last year, was conducted in the delta region of Bangladesh where the average field size is only about 0.1 hectare.
A CIMMYT scientist conducts an aerial phenotyping exercise in the Global Wheat Program experimental station in Ciudad Obregón, Sonora, Mexico. (Photo: Francisco Pinto/CIMMYT)
Developing climate-resilient wheat
CIMMYT’s wheat physiology team has been evaluating, validating and implementing remote sensing platforms for high-throughput phenotyping of physiological traits ranging from canopy temperature to chlorophyll content (a plant’s greenness) for over a decade. Put simply, high-throughput phenotyping involves phenotyping a large number of genotypes or plots quickly and accurately.
Recently, the team has engaged in the Heat and Drought Wheat Improvement Consortium (HeDWIC) to implement new high-throughput phenotyping approaches that can assist in the identification and evaluation of new adaptive traits in wheat for heat and drought.
The team has also been collaborating with the Accelerating Genetic Gains in Maize and Wheat (AGG) project, providing remote sensing data to improve genomic selection models.
Cover photo: An unmanned aerial vehicle (UAV drone) in flight over CIMMYT’s experimental research station in Ciudad Obregon, Mexico. (Photo: Alfredo Saenz/CIMMYT)
Researchers from the International Maize and Wheat Improvement Center (CIMMYT) and the International Livestock Research Institute (ILRI) have identified new genomic regions associated with maize stover quality, an important by-product of maize which can be used in animal feed.
The results of the study, published this month in Nature Scientific Reports, will allow maize breeders to select for stover quality traits more quickly and cost-effectively, and to develop new dual purpose maize varieties without sacrificing grain yield.
The researchers screened diverse Asia-adapted CIMMYT maize lines from breeders’ working germplasm for animal feed quality traits. They then used these as a reference set to predict the breeding values of over a thousand doubled haploid lines derived from abiotic stress breeding programs based on genetic information. Based on these breeding values, the scientists further selected 100 of these double haploid lines and validated the performance of stover quality traits through field-based phenotyping.
The results demonstrate the feasibility of incorporating genomic prediction as a tool to improve stover traits, circumventing the need for field or lab-based phenotyping. The findings significantly reduce the need for additional testing resources — a major hindrance in breeding dual-purpose maize varieties.
Interestingly, the researchers found that increased animal feed quality in maize stover had no impact on grain yield, a concern raised by scientists in the past.
“The main purpose of this study and overall purpose of this CIMMYT and ILRI collaboration was to optimize the potential of maize crops for farm families, increase income, improve livelihoods and sustainably manage the crop livestock system, within limited resources,” said P.H. Zaidi, a maize physiologist at CIMMYT and co-author of the study.
“More than 70% of the farmers in the tropics are smallholders so they don’t have a lot of land to grow crops for grain purposes and separate stover for animal feed, so this is a very sustainable model if they grow dual purpose maize.”
By growing maize simultaneously for both human consumption and animal feed, farmers can get the most out of their crops and conserve natural resources like land and water.
A farmer works in a maize field close to the Pusa site of the Borlaug Institute for South Asia (BISA), in the Indian state of Bihar. (Photo: M. DeFreese/CIMMYT)
Fodder for thought
The findings from this study also validate the use of genomic prediction as an important breeding tool to accelerate the development and improvement of dual-purpose maize varieties, according to CIMMYT Maize Breeder and first author of the study, M.T. Vinayan.
With the demand for animal feed increasing around the world, crop scientists and breeders have been exploring more efficient ways to improve animal feed quality in cereals without compromising grain yields for human consumption.
“Not all maize varieties have good stover quality, which is what we realized when we started working on this project. However, we discovered that there are a few which offer just as good quality as sorghum stover — a major source of livestock fodder particularly in countries such as India,” said Zaidi.
The publication of the study is a fitting tribute to the late Michael Blummel, who was a principal scientist and deputy program leader in the feed and forage development program at ILRI and co-author of this study.
“A couple of years back Dr Blummel relocated from the Hyderabad office at ILRI to its headquarters at Addis Ababa, but he used to frequently visit Hyderabad, and without fail met with us on each visit to discuss updates, especially about dual-purpose maize work. He was very passionate about dual-purpose maize research with a strong belief that the additional income from maize stover at no additional cost will significantly improve the income of maize farmers,” Zaidi said. “Michael was following this publication very closely because it was the first of its kind in terms of molecular breeding for dual purpose maize. He would have been very excited to see this published.”
