CIMMYT collaborated with Tecnologico de Monterreyâs FEMSA Biotechnology Center in the development and validation of nutraceutical corn. By leveraging Mexicoâs maize diversity through the worldâs largest germplasm bank, CIMMYT contributed expertise in crossbreeding to help incorporate traits such as higher protein, fatty acids, and antioxidants, supporting advancements in food security and sustainable agriculture.
Climate Change and Child Malnutrition in Zimbabwe: Evidence to Action will generate evidence to understand the effects of climate change on child malnutrition in rural Zimbabwe. The overarching hypothesis is that climate change and related weather events indirectly increase child malnutrition by increasing food insecurity and decreasing dietary diversity.
This project will use a multisectoral approach to evidence generation and co-creation of community and policy action that incorporates village, district, provincial and national participation. The project aims to generate evidence linking climate change to malnutrition and co-develop mitigation strategies with communities that directly address the link between climate change and malnutrition.
The project has four activities:
Examine the relationship between climate change in rural Zimbabwe and patterns of malnutrition utilizing environmental data (rainfall, temperature) and national Zimbabwe survey data (livelihoods, climate change mitigation strategies, dietary diversity and child malnutrition).
Explore community understanding of the relationships between climate change and malnutrition with a mixed methods approach in two districts (survey and community-led workshops).
Co-develop and refine climate-smart strategies that address the effects of climate change on malnutrition with agricultural and health cadres.
Develop a communication plan with policymakers to disseminate findings about the relationship between climate change to child malnutrition.
Objectives:
Use environmental data and national-level survey data on climate change and shocks related to climate change and examine associations with nutritional outcomes including food security, dietary diversity and child malnutrition.
Conduct household surveys to understand how agricultural and child feeding practices change under climate variability.
Conduct community workshops using community walks and River of Life Methodology to understand community perspectives on the relationship between climate change and child malnutrition.
Co-develop and refine climate-smart strategies that communities can implement to directly address the relationship between climate change and malnutrition.
Pilot implementation of strategies in two sites utilizing community health and agricultural extension workers.
Share results with policy makers to contextualize malnutrition in the context of climate change policy.
Huazhong agricultural university (Photo: Wallhere)
Prof. Jianbing Yan, a former maize scientist at CIMMYT, has been appointed as the President of Huazhong Agricultural University (HZAU) in Wuhan, China on 20th August 2024. Jianbing was part of the CIMMYT family working on maize genetics and molecular breeding from 2006 to 2011. He worked as a Joint Post-Doctoral Associate between CIMMYT and Cornell University from October 2006 to September 2008, as an Associate Scientist from October 2008 to August 2009, and as a Scientist from September 2009 to March 2011. Due to his excellent work on Provitamin A biofortification in maize grain, Jianbing received the Japan International Award for Yong Agricultural Researchers in 2010, and the DuPont Young Professor Award in 2011. He also received the Outstanding CIMMYT Alumnus Award in 2014.
Jianbing joined HZAU as a full professor in April 2011. He served as the Vice Dean of the College of Life Science and Technology of HZAU from 2013 to 2017, as the Dean of the College of Plant Science and Technology of HZAU from 2017 to 2020, and as the Vice President of HZAU from 2019 to 2024.
Prof. Jianbing Yan
Jianbing is renowned in the research areas of maize genetics, genomics, and big data-driven breeding. He was the winner of the 2022 L. Stadler Mid-Career Award from the Maize Genetics Cooperation; the award is given to an outstanding maize scientist who has been in a permanent position for between nine and 20 years and has an outstanding track record of discovery research in maize genetics. Jianbing also received multiple national awards, including the National Natural Science Foundation for Excellent Youth in 2012, the National Youth Top-notch Talent Support Program in 2013, the National Science Fund for Distinguished Young Scholars and the Chair Professor of Cheung Kong Scholars Programme in 2015, etc.
Huazhong Agricultural University is recognized as a first-class agricultural university worldwide. It has a total of 14 disciplines listed as the Top 1% of ESI (Essential Science Indicators), including Plant & Animal Science, and Agricultural Sciences. HZAU and CIMMYT jointly hosted a webinar on Intelligent Agriculture in 2020. CIMMYT is one of the four funder institutes for the Global Food Security Association for Young Scientists hosted by HZAU, which was officially launched in December 2022 to connect young scientists around the world, working in the fields of food security. The 1st and 2nd Global Food Security Forums for Young Scientists were co-organized by HZAU and CIMMYT in Wuhan in 2022 and 2023, respectively, to inspire future generations of scientists to communicate and exchange ideas on cutting-edge agricultural research. Dr B.M. Prasanna, Director of CIMMYT Global Maize Program, CIMMYT, has been serving as the member of the International Advisory Committee of HZAU since 2022.
CIMMYT looks forward to building strong partnerships with HZAU in strategic and applied research of crop improvement, sustainable agrifood systems, and capacity building of next-generation agricultural researchers.
South Asia, a region heavily impacted by climate change, faces rising temperatures, erratic monsoon rains causing intermittent drought and excessive moisture within the season, and frequent episodes of heat waves. These extreme weather events are challenging agrarian practices and affecting millions, especially smallholder farmers dependent upon rainfed cultivations. The halcyon days of consistent environmental conditions are gone, and adaptation and mitigation strategies have become essential in South Asia.
In May 2024, over 20 districts in the Terai region of Nepal and many parts of northern India recorded maximum temperatures between 40°C and 45°C, with several districts also experiencing heat waves during the same period. The temperature rise is not limited to the lowland plains; the effects are also being felt in the mountains, where rapid snowmelt is becoming increasingly common. In the Hindu Kush Himalayas region of Pakistan, farmers have had to shift their cropping cycles by a month to cope with drought stress caused by rising temperatures, which are leading to the early melting of snow in the region.
Partners in South Asia visiting heat stress tolerant hybrids demonstration in Nepal (Photo: CIMMYT-Nepal)
Collaborating to rise above the challenge
Amid the growing climate crisis, the Heat Stress Tolerant Maize for Asia (HTMA) project was launched by CIMMYT in 2012, with support from the United States Agency for International Development (USAID) under the Feed the Future initiative of the U.S. Government. The overarching goal of the HTMA project was to help farm families, particularly maize growers, to adapt to the impacts of soaring heat on maize productivity in South Asia. The project was implemented in partnership with 28 public and private sector stakeholders across the region and beyond to develop a multipronged approach to overcoming these challenges.
âOur aim is to develop and deploy maize hybrids with high yield potential and possess traits resilient to heat and drought stresses,â said P.H. Zaidi, Principal Scientist, and HTMA project lead at CIMMYT. Zaidi noted that during heat stress âhigh temperatures alone are not the only limiting factor- it is the combination of high temperature with low atmospheric humidity (high vapor pressure deficit), that creates a âkiller combinationâ for maize production in the Asian tropics.â
This was also emphasized in a recently published article that he co-authored.
The development of heat stress-tolerant maize involves the use of cutting-edge breeding tools and methods, including genomics-assisted breeding, double haploidy, field-based precision phenotyping, and trait-based selection. Over 20 such hybrids have been officially released in India, Nepal, Bangladesh, Pakistan, and Bhutan. Between 2023 and 2024, over 2,500 metric tons of seed from these hybrids were distributed to farmers, helping them beat the heat.
Agile partnerships-from discovery to scaling
The first phase of the project (2012-2017) focused on discovering heat-tolerant maize varieties. During this time, pipeline products underwent field evaluations in stress-prone environments, leveraging the projectâs product evaluation network of public and private partners, who contributed by managing trials and generating performance data. In the second phase (2018-2023), the focus shifted toward the deployment and scaling of heat-tolerant hybrids and strengthening seed systems in target countries to enable large-scale delivery, benefiting millions of farm families, particularly in South Asia’s rainfed ecologies. For example, the seed produced in 2023-2024 sufficed to cover over 125,000 hectares and benefited nearly 2.5 million people in the region.
HTMA project partners gathered in Nepal for the annual and project closure meeting (Photo-CIMMYT-Nepal)
Hailu Tefera, from USAID, praised the projectâs success during the annual review and project closure meeting held in Nepal from August 21-22, 2024. âWe have seen great strides in scaling heat stress tolerant hybrids in the region. This initiative aligns with the US Governmentâs Global Food Security Strategy, where building farmersâ resilience to shocks and climate vulnerability is central,â said Tefera, acknowledging the adaptive and agile partnership demonstrated by the projectâs partners throughout HTMA’s discovery and scaling phases.
One of the projectâs key achievements was creating a multi-stakeholder platform and leveraging resources across the region. Partners, including national agricultural research systems, seed companies, and higher learning institutes, expanded the projectâs impact. âThe collaboration we fostered under the HTMA project is a working example of effective partnerships,â said B.M. Prasanna, Director of CIMMYTâs Global Maize Program. He highlighted how synergies with other developmental projects in the region, especially projects supported by the USAID country mission in Nepal helped launch local hybrid seed production, transforming the country from a net importer of hybrid maize seeds to producing locally in just a few years, and such seeds of resilience cover nearly 10,000 hectares in 2023/24 alone. Using heat tolerant (HT) maize seed allows smallholder farmers to harvest nearly one metric ton per hectare additional yield than normal maize under stress conditions.
The value of the seed these new hybrids was validated by adopter farmers who grow maize in stress-vulnerable ecologies by expressing their willingness to pay a premium price for HT hybrid seed as per the study conducted in Nepal and India. âThe spillover effect of the project is helping countries like Bhutan to strengthen their seed systems and initiate hybrid seed production for the first time,â added Prasanna, expressing gratitude to USAID and all project partners.
The salient achievements of the project, including technical know-how, outputs, outcomes, and learnings were compiled as an infographic, titled “HTML Tool‘‘ and it was formally released by Narahari Prasad Ghimire, Director General of the Department of Agriculture, Government of Nepal, during the HTMA meeting in Nepal.
Rewarding achievement
Subash Raj Upadhyay, Managing Director of Lumbini Seed Company in Nepal, recalls the early days of producing heat stress-tolerant hybrid maize seed in Nepal, which began in 2018. âOur journey started with just one hectare of seed production in 2018 and 2019, and we expanded to 30 hectares by 2022. This was the first time that we started hybrid maize seed production in Nepal, specifically RH-10, a heat stress tolerant hybrid from CIMMYT, released by the National Maize Research Program of Nepal. The support of USAIDâs projects like the Nepal seed and fertilizer project was crucial for our success,â said Upadhyay, who was among the award recipients for setting a potent example in scaling up heat stress-tolerant hybrids.
HTMA TOOL- an infographic launched during the meeting (Photo-CIMMYT Nepal)
In addition to Lumbini Seed Company, Jullundur Seed Private Limited Company in Pakistan was also recognized for its efforts in seed scaling. The National Maize Research Program of Nepal and the University of Agricultural Sciences, Raichur, India, were acknowledged for their rewarding achievement in research and development during the project period.
âThe recognition exemplifies the public-private partnership that we demonstrated under the HTMA project, where the public sector mainly focused on strategic research and product development, and seed companies took charge of seed delivery and scaling,â said Zaidi during the projectâs phaseout meeting in Nepal, attended by over 60 participants from the projectâs target and spillover countries. âSuch partnership models need to be strengthened and replicated in other projects. It is important to consolidate the gains and maintain the momentum of the HTMA project in the years to come to benefit millions of smallholder farmers,â echoed Prasanna, who presented certificates of recognition to the partners in the presence of USAID representatives, senior government officials from Nepal and project partners from South Asia and beyond.
Rajendra in the maize field (Photo: Deepa Woli, CIMMYT)
Rajendra Kathariya, a 41-year-old resident of Joshipur-2 in Kailali district, far-west of Kathmandu, has transformed his life and that of his family of five through commercial agriculture. Despite many challenges, Rajendra has remained committed to achieving financial sustainability through enhanced farming practices. Over the last two years, his partnership with Nepal Seed and Fertilizer (NSAF) and CIMMYT, in collaboration with Nisrau Multipurpose Cooperative, a partner cooperative of NSAF, has been instrumental in his success.Â
Moving from traditional to modern farming
Previously, Rajendra cultivated cereal crops using traditional methods which often led to food crises for his family. However, he has now shifted to cultivating various crops throughout the year using modern farming techniques on his 1.02 ha of land and an additional 2.71 ha which he has leased.Â
“Before NSAF’s support, we only cultivated two crops per year. Now we harvest three crops and are considering commercial maize production,” Rajendra said.Â
Remarkable achievements in crop production
Last year, Rajendra cultivated rice on 3.72 ha, yielding 8.8 metric tons (t) worth NPR 250,000 (US $1,880.71). Similarly, he sold 3.8t of spring maize from 1.35 ha, earning NPR 110,000 (US $827.51). This year, he expanded maize cultivation to 2.03 ha, with an expected income of NPR 200,000 (US $1,504.57). His potato crop yielded 5.5t worth NPR 125,000 (US $940.35), with an additional 5.5t stored for future sale.Â
In addition to crops, Rajendra has established a pig farm, earning NPR 400,000 (US $3,009.13) in 2023 from selling pigs. He received a feed-making machine for pigs from NSAF, under its support to agribusiness Micro, Small and Medium Enterprises (MSMEs). Â
Embracing modern technology and techniques
Rajendra uses both organic and chemical fertilizers and follows improved farming techniques such as hybrid seeds, line sowing, and machinery use. He owns a mini tiller and rents other machinery as needed. This year, with support from NSAF, he used a drone to spray fertilizer on his spring maize, significantly reducing labor and time.Â
“I have viewed videos of drones spraying fertilizer but never imagined it happening on my spring maize land. As a demonstration, 0.57 ha was used for nano urea spraying. The task was completed within five minutes of the drone taking flight. Similarly, I was astonished to learn that a drone can cover 2.02 ha in a mere 20 minutes,” he shared.Â
Intercropping and future plans
Rajendra has also implemented intercropping, combining maize with legumes on a 0.10-hectare plot. “Spring maize-legume intercropping is productive and effective for farmers such as me. We can make a profit from legumes, as well as spring maize. I will continue using this practice in the future,” he said.Â
Financial investments and community impact
The profits from agriculture have helped Rajendra to manage his household comfortably. He can now provide education for his four children, manage household expenses, and also pay the loan that he had taken for his household expenses. In addition, he recently invested NPR 250,000 (US $1,880.71) to build a new pig shed. He also sells his produce in local markets at Joshipur, Kailali. Â
“I have travelled a long way from being a subsistence farmer to engaging in commercial farming. This shift from traditional to improved farming technologies has been made possible with the support of NSAF/CIMMYT. I am grateful for their assistance and encouragement,” Rajendra said.Â
Vision for sustainability
Rajendraâs story reflects his dedication and hard work. “I was working as a daily wage laborer in India, hoping to secure a promising future for my children. Today, I can achieve complete sustainability through agriculture and provide quality education and a better life for my children,” he shared.Â
Drone on maize field (Photo: by Shishir Sapkota, CIMMYT)
Dorothy Mandaza, local farmer from ward 19 of Seke District, inspecting her maize cobs (CIMMYT)
Maize productivity in eastern and southern Africa faces numerous challenges, including biotic and abiotic stresses, as well as socio-economic factors. To tackle these constraints, CIMMYT, in collaboration with partners, has been developing elite multiple stress-tolerant maize hybrids for different market segments. The hybrids are rigorously evaluated in research stations under managed stresses, especially those faced by farmers, including drought, heat, and low nitrogen. The process is complemented with evaluations conducted in actual farmer conditions through a participatory approach, which enables researchers to identify traits preferred by farmers.
Over the years, and through consistent engagement with farming communities, CIMMYT and partners have established a large on-farm testing network to allow farmers to test the best-performing hybrids within their own fields and management. This ensures that new varieties selected for commercialization suit the needs, constraints, and priorities of smallholder farmers.
Centrality of ROFT in the variety development process
Regional on-farm trials (ROFTs) are a crucial step towards maximizing the impact of breeding investments. ROFTs help scientists understand the performance of pipeline hybrids under diverse management conditions. The data and insights gathered from these trials, led by district leads, are instrumental in identifying the best varieties to release. In Zimbabwe, the extensive on-farm testing is conducted with support from Zimbabweâs government extension arm, the Department of Agricultural, Technical, and Extension Services (Agritex), and selected seed companies.
To help track the progress or challenges in varietal performance evaluation at the farm level, CIMMYT has been convening feedback sessions with district agriculture extension officers (DAEOs) across 19 districts. These sessions have been instrumental in strengthening the collaboration with Agritex, standardizing data collection, and improving data quality and returns from the established on-farm testing network.
Conversations with district agriculture extension officers in Harare during a feedback session. (Photo/CIMMYT)
The ROFT trials have been ongoing in Zimbabwe for over a decade across 19 districts, located in natural regions I, II, and III. These trials have been implemented by more than 137 AEOs and have involved over 1,000 farmers. The network deliberately included a diverse range of farmers, with around 40% being female plot managers, to encompass a wide range of smallholder farming practices.
Participatory engagement is key
Every year, CIMMYT produces improved varieties that are then taken up by partners, including National Agricultural Research System (NARS) partners and seed companies. The on-farm trials aim to generate agronomic performance data in comparison to the widely grown commercial varieties and farmersâ own varieties. This data is used for a rigorous advancement process, where varieties that pass the test are then furthered for licensing and possible commercialization by CIMMYTâs partners.
Farmer involvement at the final stage of the variety selection process is key to the success of these trials. Farmers evaluate the varieties based on their specific needs, on their farms. This step is crucial as it empowers farmers to have a say in the variety development process. CIMMYT actively uses this participatory selection approach, seeking input from farmers and refining breeding targets as necessary. Farmers communicate their preferences and feedback through the farmer evaluation sheets, helping breeders fine-tune their targets and develop varieties that meet farmers’ needs.
Another key element of the on-farm trials is that they help assess breeding progress in farmersâ fields in terms of crop productivity and return on investment.
Food security in the prevailing uncertain climatic and economic conditions can only be guaranteed by deliberate actions toward maximizing production, especially in stress-prone environments. The main priority of the CGIAR and NARS breeding programs is to enhance genetic gain in crops through the assessment of seed varieties with drought-resilient, nutritional, and yield traits. This is achieved by leveraging data-driven approaches and embracing contemporary tools and methodologies.
Innovative approaches such as molecular tools, doubled haploid technology, and refined breeding schemes have greatly contributed to the strides made in CIMMYTâs endeavor to elevate genetic gain within breeding pipelines. These advancements not only drive improved productivity but also promise cost-effective strategies for navigating the challenges posed by climate variability.
Molecular Tools
In maize breeding, traditionally, at each stage of the pipeline, entries are grown in multi-location trials. Phenotyping in multiple environments helps to select the best entries not only based on their genetic values but also on environmental factors and their interaction with diverse environments. However, this is also a labor-intensive and time-consuming step in the breeding pipeline. Molecular breeding offers a transformative solution by expanding breeding programs while minimizing phenotyping requirements. It is a well-known fact that trait phenotype results from both genetic and non-genetic factors, with genetic factors being contributed by the expression of genes at the DNA level.
Identifying genomic regions close to causative genes for traits of interest, such as high yield, disease resistance, or quality, can help to incorporate desirable genes/alleles into selected elite genotypes. DNA-based markers aid in efficiently tracking the inheritance of genetic traits, thereby facilitating the selection of desired traits in breeding programs. Marker-assisted forward breeding accelerates the selection of plants with desired traits by identifying the genetic markers associated with those traits. With such harnessed genotypic information, breeders can pre-select genetic material before embarking on the resource-intensive phenotyping stages. This strategic utilization of molecular markers, particularly in identifying susceptibility to key diseases like maize streak virus (MSV) and maize lethal necrosis (MLN), enables the judicious allocation of resources for phenotyping.
Figure 1. Summary of marker-assisted forward breeding across six breeding pipelines for MLN- and MSV-resistance haplotypes over the past six years.
Since 2018, CIMMYT has been implementing marker-assisted forward breeding for MSV and MLN. Since then, more than 100,000 pure breeding lines have been tested by examining their favorable haplotypes with a small set of 10 genetic markers and discarding the lines carrying unfavorable haplotypes for MSV and MLN resistance. In the last six years, nearly 30,000 lines have been rejected before undergoing field testing. In southern Africa, for instance, a rapid response to seed movement using molecular and serological techniques prevented the spread of MLN and facilitated the incorporation of resistance traits into new plant varieties.
Most hybrids in the final stages of breeding pipelines are passed through forward breeding. While Fall Armyworm, Gray Leaf Spot, common rust, and Turcicum Leaf Blight also cause substantial yield reductions in sub-Saharan Africa, research carried out under the AGG project indicates that the genetic makeup of these traits is oligogenic, governed by both moderate and small effect quantitative trait loci (QTLs), but lacking a single major-effect QTL and not amenable to forward breeding. This means that their resistance is influenced by complex multiple genetic factors, rather than being primarily controlled by a few major genetic regions. Alternatively, these biotic stress traits can be improved effectively through genomic selection.
Genomic selection is used to improve complex traits that are controlled by many small-effect QTLs. This approach does not require prior genetic information about the trait of interest and uses genome-wide marker information to estimate all marker effects and select individuals with high genomic-estimated breeding values (GEBVs). This means it uses data from various genetic markers to predict which individuals are likely to have desirable alleles for MSV and MLN. Genomic selection is being applied for grain yield under drought stress, and efforts are underway to extend its application to address more complex challenges related to plant diseases and pests. Foliar diseases are moderately complex traits.
Proof of concept on applying genomic selection for foliar diseases like gray leaf spot and northern corn leaf blight showed high prediction accuracies, supporting the implementation of genomic selection together with forward breeding for other traits at the early stage of the breeding pipeline. Implementing genomic selection for GY under optimum and drought management proved that maize breeders could obtain the same gain as with conventional breeding, where all entries are phenotyped in the field, but at approximately 35-40% less cost. Many candidate hybrids now entering the advanced stages of the breeding pipeline were developed using genomic selection. Several of our earlier studies (Beyene et al., 2015, 2016, 2019, 2021; Chaikam et al., 2019; Crossa et al., 2017; Prasanna et al., 2022; Vivek et al., 2017) showed that breeding pipelines achieved high genetic gain by adopting new molecular tools, thus confirming the benefit of adopting molecular breeding tools.
Currently, in CIMMYTâs eastern and southern breeding pipelines, all product profiles are using genomic selection at stage I, where the training population is evaluated in multiple locations with a sparse design, estimating the GEBVs for the unphenotyped lines, and using GEBVs and phenotypic BLUPs of test crosses in the selection for stage II. This process allows the handling of a large number of lines at stage I with a fixed budget without losing selection accuracy. Since 2017, we have used the âtest half and predict halfâ strategy (Figure 2), where all the lines were genotyped with mid-density markers, and the selected ~50% of the total stage I lines were testcrossed and evaluated in multiple locations to be used as a training population to estimate the GEBVs for the other 50% of the unphenotyped lines for the traits of interest. High prediction correlations were observed in three selected product profiles for GY under optimum, managed drought, and low soil N conditions (Figure 3).
Genomic selection is also implemented to reduce the breeding cycle. However, our final products are three-way cross hybrids, where genomic selection is applied only to select the best line rather than selecting the best hybrid combinations. Historical data were used to test the possibility of reducing the breeding cycle. However, our results showed that the use of historical data to predict 100% of lines from the current year yielded low to moderate prediction correlations both under optimum and drought conditions for GY, anthesis date, and plant height (Figure 4). Incorporating 10 to 30% of the testing population into the training population leads to high prediction correlations. This concludes that by using historical data, the training population, which needs to be test-crossed and evaluated in multiple locations every year, can be reduced from 50% to 10-30%, which helps breeders allocate the saved resources to evaluate more lines without losing prediction accuracy.
Doubled Haploid Technology
Doubled haploid technology speeds up the creation of inbred lines by producing entirely uniform lines. Pedigree line development is a traditional method in plant breeding aimed at gradually improving and stabilizing the genetic makeup of the new variety over time. It involves multiple generations of controlled crosses between parent plants with known characteristics. Each subsequent generation is carefully selected based on specific traits of interest, such as yield, disease resistance, or quality. Pedigree line development is expensive, particularly when nurseries are in remote locations.
Unlike traditional methods where some genetic variation remains, doubled haploid lines are completely homogeneous. This means that there is increased heritability of desirable traits and improved accuracy of selection. Doubled haploid technology, which is more compatible with the use of molecular markers, simplifies breeding processes and shortens the time needed to develop inbred lines (Chaikam et al., 2019).
The first doubled haploid facility in Africa was established in 2013 and is extensively used by the CGIAR, NARES, and the private sector. Over the past five years, 1,349 populations have been induced and more than 223,144 doubled haploid lines delivered to breeding programs from CGIAR, NARES, and the private sector in sub-Saharan Africa. Shifting from traditional pedigree-based breeding to doubled haploid technology has shown a high impact on key breeding metrics (gain per cycle and gain per year) not only in CIMMYT but also in national partners’ breeding programs, thus increasing genetic gain within the available budget.
Figure 2. Number of lines evaluated with phenotypic selection (PS) and genomic selection (GS) at stage I in EAPP1 product profile from 2017 to 2023. (PS â phenotypic selection, GS â genomic selection)Figure 3. Prediction correlations for grain yield (GY) under optimum (OPT), drought (MDt) and low soil N (low N) management conditions in EAPP1, EAPP2 and SAPP1 at stage I in 2023
Figure 4. Prediction accuracies for grain yield (GY), anthesis date (AD) and plant height (PH) estimated from independent validation schemes using a training population (TRN) consisting of 2017- and 2018-years breeding data and 10%, 30%, 50%, 70% and 90% of 2019 data converted from the testing population (TST) to the training population under optimum and managed drought conditions
Beyene, Y., Gowda, M., Suresh, L. M., Mugo, S., Olsen, M., Oikeh, S. O., Juma, C., Tarekegne, A., and Prasanna, B. M. (2017). Genetic analysis of tropical maize inbred lines for resistance to maize lethal necrosis disease. Euphytica213.
Beyene, Y., Semagn, K., Crossa, J., Mugo, S., Atlin, G. N., Tarekegne, A., et al. (2016). Improving maize grain yield under drought stress and non-stress environments in sub-saharan africa using marker-assisted recurrent selection. Crop Science 56, 344â353. doi: 10.2135/cropsci2015.02.0135
Beyene, Y., Semagn, K., Mugo, S., Tarekegne, A., Babu, R., Meisel, B., Sehabiague, P., Makumbi, D., Magorokosho, C., and Oikeh, S. (2015). Genetic gains in grain yield through genomic selection in eight biâparental maize populations under drought stress. Crop Science55, 154-163.
Chaikam, V., Molenaar, W., Melchinger, A. E., and Prasanna, B. M. (2019). Doubled haploid technology for line development in maize: technical advances and prospects. Theor. Appl. Genet. 132, 3227â3243. doi: 10.1007/s00122-019-03433-x
Prasanna BM, Burgueño J, Beyene Y, Makumbi D, Asea G, Woyengo V, Tarekegne A, Magorokosho C, Wegary D, Ndhlela T, Zaman-Allah M, Matova PM, Mwansa K, Mashingaidze K, Fato P, Teklewold A, Vivek BS, Zaidi PH, Vinayan MT, Patne N, Rakshit S, Kumar R, Jat SL, Singh SB, Kuchanur PH, Lohithaswa HC, Singh NK, Koirala KB, Ahmed S, San Vicente F, Dhliwayo T, Cairns JE. 2022. Genetic trends in CIMMYTâs tropical maize breeding pipelines. Scientific Reports 12, 20110. https://doi.org/10.1038/s41598-022-24536-4
Vivek, B. S., Krishna, G. K., Vengadessan, V., Babu, R., Zaidi, P. H., Kha, L. Q., et al. (2017). Use of genomic estimated breeding values results in rapid genetic gains for drought tolerance in maize. Plant Genome 10, 1â8. doi: 10.3835/plantgenome2016.07.0070
In Colombia, maize is the most important cereal, integral to culture, tradition, and diet. In 2019, Colombia consumed 7.2 million tons of maize, a quarter of which was white-grain maize used for human food (the remainder was yellow-grain maize for animal feed, with a small portion for industrial uses). National production is concentrated in the departments of Meta, Tolima, CĂłrdoba, Huila, and Valle del Cauca. Native and creole maize varietiesâthe latter comprising farmer varieties of mixed native and other ancestriesâare grown for use in traditional dishes or for sale at local markets.
Due to climate change, socioeconomic pressures, and the out-migration of smallholder farmers seeking better livelihoods, native maize varieties and the unique genetic qualities those varieties embody are endangered. We aim to design strategies that benefit smallholders who wish to continue in agriculture and perhaps continue growing native varieties valued in their communities, fostering the conservation and production of native maize. CIMMYT in Mexico has already facilitated commercial linkages between chefs in Mexico City and tourist areas (for example, in the states of Oaxaca, YucatĂĄn, and the State of Mexico), sourcing blue maize landrace grain from farmers in mutually beneficial arrangements.
CIMMYT and local partners have launched an ambitious initiative to map and strengthen the value chain of native maize in the departments of Nariño, Cundinamarca, BoyacĂĄ, Valle del Cauca, and Putumayo to promote beneficial farmer-market linkages and better understand Colombiaâs maize value chain. Carried out under the Nature Positive Initiative of OneCGIAR, the project is documenting maize conservation, marketing, and consumption to design a critical path that strengthens the value chain of Colombian native maize and benefits agriculture and the economy of rural Colombian communities.
Most native maize varieties in Colombia are grown on small plots for home consumption, exchange, and the sale of surplus grain. âThe production is planned so that the percentage of sales is lower than consumption,â explains a farmer from Nariño. âMaize grain is sold in traditional markets, typically on Saturdays or Sundays, most often as fresh white and yellow corn.â
In such markets, farmers may also sell their grain to intermediaries, but only in the markets of Nariño is the sale of creole and native maize varieties acknowledged. Varieties include yellow Capia, white Capia, yellow Morocho, and Granizo, with Chulpe being less common. The grain purchased is used to prepare a variety of traditional dishes and beverages.
The most commonly grown varieties are intended for the market and probably the regional and urban cultural groups that consume them, such as in Guaitarilla, Nariño, where large crops of white maize are marketed through intermediaries and traders to satisfy demand.
âA variety that is not widely grown may become more prominent due to market changesâsuch as the rise of niche markets,â the research team notes. Good examples are the departments of Pasto, Nariño, and Cundinamarca, where maize is increasingly grown to meet demand from buyers of purple or colored maize.
We have already identified several possible niche markets for smallholder maize varieties:
Fair trade enterprises. They promote the commercialization of national products at fair prices for farmers, offering maize in various forms from regions such as BoyacĂĄ and Cundinamarca.
Restaurants. They use maize in traditional dishes, reinterpretations of Colombian cuisine, and culinary experiments.
Small-scale local intermediaries. Without a fixed physical space, they distribute products to end users and other businesses.
Callanas and ricota, Pasto, Nariño. (Foto: Andrea Gómez)
Significant challenges may hamper these and other possible market opportunities in the maize value chain. Farmers, for example, face high production costs, climate change losses, competition from neighboring countries, dependence on intermediaries for sales, and a lack of land. For their part, buyers struggle with obtaining consistent production volumes from farmers, lack storage infrastructure, and face postharvest pest and disease management challenges.
While they are compelled by the need to feed their families and, if possible, grow enough grain to sell for a profit, smallholder maize farmers have also expressed interest in preserving maize diversity and their cultural practices.
âWe are not interested in growing monocultures for marketing; we grow maize out of love to continue preserving it,â comments a farmer from Nariño. Another farmer adds: âI would grow or sell more if the production were aimed at protecting agrobiodiversity, food security, sovereignty, and preserving cultural practices.â
Focus group with farmers in Córdoba, Nariño on the importance of maize landrace conservation (Picture Janeth Bolaños)
To understand how niche markets could influence the conservation and rescue of native and creole maize in Colombia and, at the same time, design a critical path that strengthens the value chain and promotes fair and efficient niche markets, CIMMYT and its partners are conducting focus group interviews and buyer-meets-seller events. The aim is to mitigate challenges highlighted by the actors and create beneficial conditions for farmers and consumers, promoting a better future for Colombian smallholder farmers.
We deeply thank CIMMYT partners in Colombia for their contributions to this work: Andrea Gomez, Andrea PinzĂłn, and Jeisson RodrĂguez.
The SKUAST-K Maize Improvement Programme, in collaboration with CIMMYT, is making significant advancements in maize agriculture in Jammu and Kashmir. By developing resilient maize varieties and leveraging cutting-edge research, the programme addresses key challenges such as poor soil nutrition and erratic rainfall. This partnership has not only enhanced maize productivity and climate resilience but also secured substantial funding and facilitated the release of landmark varieties, ultimately contributing to a sustainable maize-based economy in the region.
âAchieving food security by mid-century means producing at least 50 percent more food,â said U.S. Special Envoy for Global Food Security, Cary Fowler, citing a world population expected to reach 9.8 billion and suffering the dire effects of violent conflicts, rising heat, increased migration, and dramatic reductions in land and water resources and biodiversity. âFood systems need to be more sustainable, nutritious, and equitable.â
CIMMYTâs 2030 Strategy aims to build a diverse coalition of partners to lead the sustainable transformation of agrifood systems. This approach addresses factors influencing global development, plant health, food production, and the environment. At DialogueNEXT, CIMMYT and its network of partners showcased successful examples and promising directions for bolstering agricultural science and food security, focusing on poverty reduction, nutrition, and practical solutions for farmers.
Without healthy crops or soils, there is no food
CIMMYTâs MasAgro program in Mexico has enhanced farmer resilience by introducing high-yielding crop varieties, novel agricultural practices, and income-generation activities. Mexican farmer Diodora Petra Castillo Fajas shared how CIMMYT interventions have benefitted her family. âOur ancestors taught us to burn the stover, degrading our soils. CIMMYT introduced Conservation Agriculture, which maintains the stover and traps more humidity in the soil, yielding more crops with better nutritional properties,â she explained.
CIMMYT and African partners, in conjunction with USAIDâs Feed the Future, have begun applying the MasAgro [1] model in sub-Saharan Africa through the Feed the Future Accelerated Innovation Delivery Initiative (AID-I), where as much as 80 percent of cultivated soils are poor, little or no fertilizer is applied, rainfed maize is the most widespread crop, many households lack balanced diets, and erratic rainfall and high temperatures require different approaches to agriculture and food systems.
The Food and Agriculture Organization of the United Nations (FAO) and CIMMYT are partnering to carry out the Vision for Adapted Crops and Soils (VACS) movement in Africa and Central America. This essential movement for transforming food systems endorsed by the G7 focuses on crop improvement and soil health. VACS will invest in improving and spreading 60 indigenous âopportunityâ cropsâsuch as sorghum, millet, groundnut, pigeon pea, and yams, many of which have been grown primarily by womenâto enrich soils and human diets together with the VACS Implementersâ Group, Champions, and Communities of Practice.
The MasAgro methodology has been fundamental in shaping the Feed the Future Southern Africa Accelerated Innovation Delivery Initiative (AID-I) Rapid Delivery Hub, an effort between government agencies, private, and public partners, including CGIAR. AID-I provides farmers with greater access to markets and extension services for improved seeds and crop varieties. Access to these services reduces the risk to climate and socioeconomic shocks and improves food security, economic livelihoods, and overall community resilience and prosperity.
Healthy soils are critical for crop health, but crops must also contain the necessary genetic traits to withstand extreme weather, provide nourishment, and be marketable. CIMMYT holds the largest maize and wheat gene bank, supported by the Crop Trust, offering untapped genetic material to develop more resilient varieties from these main cereal grains and other indigenous crops. Through the development of hardier and more adaptable varieties, CIMMYT and its partners commit to implementing stronger delivery systems to get improved seeds for more farmers. This approach prioritizes biodiversity conservation and addresses major drivers of instability: extreme weather, poverty, and hunger.
Food systems must be inclusive to combat systemic inequities
Successful projects and movements such as MasAgro, VACS, and AID-I are transforming the agricultural landscape across the Global South. But the urgent response required to reduce inequities and the needed investment to produce more nutritious food with greater access to cutting-edge technologies demands inclusive policies and frameworks like CIMMYTâs 2030 Strategy.
âIn Latin America and throughout the world, there is still a huge gap between the access of information and technology,â said Secretary of Agriculture and Livestock of Honduras, Laura Elena Suazo Torres. âCivil society and the public and private sectors cannot have a sustainable impact if they work opposite to each other.â
Ismahane Elouafi, CGIAR executive managing director, emphasized that agriculture does not face, âa lack of innovative science and technology, but weâre not connecting the dots.â CIMMYT offers a pathway to bring together a system of partners from various fieldsâagriculture, genetic resources, crop breeding, and social sciences, among othersâto address the many interlinked issues affecting food systems, helping to bring agricultural innovations closer to farmers and various disciplines to solve world hunger.
While healthy soils and crops are key to improved harvests, ensuring safe and nutritious food production is critical to alleviating hunger and inequities in food access. CIMMYT engages with private sector stakeholders such as Bimbo, GRUMA, Ingredion, Syngenta, Grupo Trimex, PepsiCo, and Heineken, to mention a few, to âlink science, technology, and producers,â and ensure strong food systems, from the soils to the air and water, to transform vital cereals into safe foods to consume, like fortified bread and tortillas.
Reduced digital gaps can facilitate knowledge-sharing to scale-out improved agricultural practices like intercropping. The Rockefeller Foundation and CIMMYT have âembraced the complexity of diversity,â as mentioned by Roy Steiner, senior vice-president, through investments in intercropping, a crop system that involves growing two or more crops simultaneously and increases yields, diversifies diets, and provides economic resilience. CIMMYT has championed these systems in Mexico, containing multiple indicators of success from MasAgro.
Today, CIMMYT collaborates with CGIAR and Total LandCare to train farmers in southern and eastern Africa on the intercrop system with maize and legumes i.e., cowpea, soybean, and jack bean. CIMMYT also works with WorldVeg, a non-profit organization dedicated to vegetable research and development, to promote intercropping in vegetable farming to ensure efficient and safe production and connect vegetable farmers to markets, giving them more sources for greater financial security.
Conflict aggravates inequities and instability. CIMMYT leads the Feed the Future Sustainable Agrifood Systems Approach for Sudan (SASAS) which aims to deliver latest knowledge and technology to small scale producers to increase agricultural productivity, strengthen local and regional value chains, and enhance community resilience in war-torn countries like Sudan. CIMMYT has developed a strong partnership funded by USAID with ADRA, CIP, CRS, ICRISAT, IFDC, IFPRI, ILRI, Mercy Corps, Near East Foundation, Samaritanâs Purse, Syngenta Foundation, VSF, and WorldVeg, to devise solutions for Sudanese farmers. SASAS has already unlocked the potential of several well-suited vegetables and fruits like potatoes, okra, and tomatoes. These crops not only offer promising yields through improved seeds, but they encourage agricultural cooperatives, which promote income-generation activities, gender-inclusive practices, and greater access to diverse foods that bolster family nutrition. SASAS also champions livestock health providing food producers with additional sources of economic resilience.
National governments play a critical role in ensuring that vulnerable populations are included in global approaches to strengthen food systems. Mexicoâs Secretary of Agriculture, Victor Villalobos, shared examples of how government intervention and political will through people-centered policies provides greater direct investment to agriculture and reduces poverty, increasing shared prosperity and peace. âAdvances must help to reduce gaps in development.â Greater access to improved agricultural practices and digital innovation maintains the field relevant for farmers and safeguards food security for society at large. Apart from Mexico, key government representatives from Bangladesh, Brazil, Honduras, India, and Vietnam reaffirmed their commitment to CIMMYTâs work.
Alice Ruhweza, senior director at the World Wildlife Fund for Nature, and Maria Emilia Macor, an Argentinian farmer, agreed that food systems must adopt a holistic approach. Ruhweza called it, âThe great food puzzle, which means that one size does not fit all. We must integrate education and infrastructure into strengthening food systems and development.â Macor added, âThe field must be strengthened to include everyone. We all contribute to producing more food.â
Generating solutions, together
In his closing address, which took place on World Population Day 2024, CIMMYT Director General Bram Govaerts thanked the World Food Prize for holding DialogueNEXT in Mexico and stressed the need for all partners to evolve, while aligning capabilities. âWe have already passed several tipping points and emergency measures are needed to avert a global catastrophe,â he said. âAgrifood systems must adapt, and science has to generate solutions.â
Through its network of research centers, governments, private food producers, universities, and farmers, CIMMYT uses a multidisciplinary approach to ensure healthier crops, safe and nutritious food, and the dissemination of essential innovations for farmers. âCIMMYT cannot achieve these goals alone. We believe that successful cooperation is guided by facts and data and rooted in shared values, long-term commitment, and collective action. CIMMYTâs 2030 Strategy goes beyond transactional partnership and aims to build better partnerships through deeper and more impactful relationships. I invite you to partner with us to expand this collective effort together,â concluded Govaerts.
[1] Leveraging CIMMYT leadership, science, and partnerships and the funding and research capacity of Mexicoâs Agriculture Ministry (SADER) during 2010-21, the program known as âMasAgroâ helped over 300,000 participating farmers to adopt improved maize and wheat varieties and resource-conserving practices on more than 1 million hectares of farmland in 30 states of Mexico.
While maize is the primary staple food crop in Zambia, its productivity on farmersâ fields reaches on average only about 20 percent of what it could achieve with good agronomic practices. Some reasons for this inefficiency are use of traditional varieties, low fertilizer use, and ineffective weed and pest control.
Closing the gap between potential and realized yields would have major benefits for farmers in Zambia, both in terms of income and food security at the household and national levels. One possibility to increase maize productivity is by increasing crop diversity through the inclusion of legumes in maize-based farming systems. This could be done through intercropping, growing legumes in the rows between maize plants, or crop rotations and alternating maize and legumes in the same field from season to season.
CIMMYT scientists, along with collaborators from the Zambia Agriculture Research Institute (ZARI) and the University of Zambiaâs School of Agricultural Science, set out to determine which cropping systems might lead to increased productivity for maize farmers in Zambia and their results were published in the journal Field Crops Research.
âThere is great potential in Zambia to increase yields to help ensure food security,â said Mulundu Mwila, PhD candidate and scientist at ZARI. âWe wanted to determine the cropping systems that offered the most benefits.â
Setting up the study
For this research, ZARI and CIMMYT scientists established maize-based cropping systems trials, comprising maize monocropping, and maize-legume rotations and intercrops under both âconventionalâ tillage, and Conservation Agriculture, across 40 farms in a variety of agroecological zones in Zambia. Â The team also conducted household surveys in the same communities hosting the on-farm trials to determine the share of households with enough cultivated land to benefit from the tested cropping systems.
Researchers found that the tested cropping systems produced more maize per hectare compared to non-trial host farms in the same region. The greatest positive effect uncovered was that maize-legume rotations in Zambiaâs Eastern Province had the potential to increase maize yield by 1 to 2 tons per hectare, per growing season. âThe Eastern Province trials showed better results because of stable and adequate rainfall amounts and distribution and because of using groundnut as a rotation crop,â said Mwila.
Researchers attributed the small effect of legumes on maize yield in the Southern Province to low levels of biomass production and nitrogen fixation, due to low and erratic rainfall, and to low residue incorporation because of livestock grazing. Conversely, the small effect of legumes on maize yield in the Northern Province might be attributed to the high rainfall amount in the region, leading to high rates of leaching of residual nitrogen during the growing season as well as the use of common beans as the preceding crop.
Finding the right amount of land
With evidence showing the potential benefits of maize-legume rotations, the availability of land is a constraint for small farms across sub-Saharan Africa, thus it is important to quantify the land area needed for farmers to implement maize-legume rotations.
âOur findings match prior research showing the benefits of maize-legume rotations in Eastern Zambiaâ said Silva. âHowever, implementing maize-legume rotations remains a challenge for many smallholders due to small farm sizes.â
Nearly 35, 50, and 70% of the surveyed farms in the Northern, Eastern, and Southern Provinces, respectively, had enough land to achieve the same level of maize production obtained on their farm with the yields of the maize-legume rotations tested in the on-farm trials. âWith our findings showing increased maize yields, and our efforts to determine the amount of land needed for food and nutrition security at household level, the next steps can be to facilitate methods to disseminate this information to policy makers and to farmers that have enough land area to benefit from diversified cropping systems,â said Silva.
For farmers with not enough land to reap the benefits of maize-legume rotations, intercropping legumes within the maize has shown promising results. The researchers also call for further research to specify the contributing factors to small farms not seeing benefits from maize-legume rotations.
CIMMYT contributes to Mars’ sustainability efforts by equipping Mexican maize producers with tools and training through the Next Generation Soil program. This collaboration supports Mars’ climate-smart agriculture initiatives, reducing agricultural greenhouse gas emissions, which make up 60% of its total GHG footprint. By promoting regenerative agriculture practices, CIMMYT helps Mars work towards a 50% GHG reduction by 2030 and achieving net-zero emissions by 2050.
Chris Ojiewo, from CIMMYT, emphasizes the urgent need for African farmers to produce more food within restricted areas to accommodate the continent’s growing population. He advocates for increasing crop productivity by developing resilient varieties and advanced production systems that can thrive in intensified and drought-prone conditions. Ojiewo suggests boosting maize yields from one ton per hectare to higher levels through innovative agricultural practices, highlighting CIMMYT’s role in addressing food security challenges exacerbated by climate change.
A farmer in Nariño, Colombia on a diversified chagra with native maize, potato, oca, squash, fava bean, and other perennial and wild crop harvests. (Photo: GonzĂĄlez, Alpala, PinzĂłn, RodrĂguez, Bolaños, Romero, GonzĂĄlez)
In the mountains of Nariño and the Cauca Valley, Colombiaâas in many other rural regions of Latin Americaâfarming systems are usually family-operated and divided by gender. Women’s and men’s roles are separate and differ in terms of expertise, involvement, and decision-making.
Roles traditionally assigned to women often limit their capacity to bring about changes in agriculture. âFood preparation, house cleaning, family care, and especially childcare, limit their ability to participate in agricultural trainingâ, says a team of CIMMYT specialists who recently carried out a series of participatory diagnostics in these regions of Colombia.
Participatory diagnostics are designed to document and understand farmersâ perspectives on native maize conservation and the desertion of rural regions in order to jointly develop conservation strategies for these regions. However, CIMMYT specialists noted that women farmers struggle to participate and learn when they are burdened with childcare.
Group of women farmers discuss menâs and womenâs roles in native maize conservation in CĂłrdoba, Nariño, Colombia. (Photo: GonzĂĄlez, Alpala, PinzĂłn, RodrĂguez, Bolaños, Romero, GonzĂĄlez)
âEven when women try hard to attend events, they cannot fully take in the new information because they are busy tending to their children.â In response, the event organizers came up with a novel solution: providing childcare during workshops. âSo, mothers can focus on what they are doing during workshops, children partake in organized games and exploratory and artistic activities in a safe space where their mothers can see them.â
During a recent diagnostic “several activities were planned, like board gamesâCIMMYT developed memory and bingo games, as well as snake and ladder board games on principle maize practices and pestsâand some art projects allowing the children to talk about how they interact with the land and what it means to them. At the end, they displayed their work about what they learn with their mothers and family in the tulpa (fire pit) or chagra,” the specialists explain.
âThese types of activities are important and enriching for the children because they replace day-to-day cellphone play with recreational games about agriculture. So, it seems that we should make sure that the local children know about these types of events,â expressed the attendees. They also reflected on how this type of inclusion helps strategies addressing generational replacement, particularly in places like Nariño, where the number of young people in the fields is notably decreasing.
This is how the childrenâwho originally could only hope to be expected to sit silently or play on their phonesâ became an important part of the participatory processes in Nariño. And now, with this support, women from rural communities, donât just have the opportunity to expand their knowledge. They can also make positive contributions to household decisions and phytogenetic resource conservation.
Girls make a presentation about their territory to their mothers and fathers, based on the activities during the workshops in Nariño, Colombia. (Photo: GonzĂĄlez, Alpala, PinzĂłn, RodrĂguez, Bolaños, Romero, GonzĂĄlez)
âYes maâam, the childrenâs space was the best because that way we were able to focus on the topics,â reported a woman in Cumbal. This is an example of how an agricultural extension strategy requires us to identify the preferences, interests, and incentives of men and women in relation to their gender roles in order to create environments that facilitate the development of sustainable agricultural technologies and practices. We must understand that the work women farmers perform both in the fields and within the household are inextricable from each other.
These types of strategies are crucial for combatting the environmental and food crisis because small-scale farmers implement sustainable agrifood systems and promote agrobiodiversity conservation. We find the resources essential for agrifood security in their milpas, orchards, backyards, and chagrasâin Mexico and Colombiaâwhere they handle, use, and preserve native crops and determine the selection of improved climate-resilient varieties.
In Murehwa District, situated in Zimbabweâs grain basket in the eastern part of the country, vitamin A deficiency is prevalent in almost all households, regardless of their wealth, reveals a study striving to quantify the nutritional yields of provitamin A maize across a diverse range of smallholder farms in Zimbabwe and to understand the potential role of improved agronomy in increasing nutritional yields. Published in the Journal of Nutrition, the study is part of a collaborative project between CIMMYT and Rothamsted Research, funded by the UK Global Challenges Research Fund, administered by the Biotechnology and Biological Sciences Research Council.
The study revealed that vitamin A deficiency is most prevalent in the wet seasons when the number of people within a household is higher. Using a range of realistic provitamin A concentration levels, modelling showed that the consumption of provitamin A maize could ensure that almost three-quarters of households reach 50% of their vitamin A requirement.
Thirty households participated in the study, quantifying the composition of their diet across the main agricultural (wet) season and off (dry) season. A market study of locally available food was also conducted at the same time. In Murehwa District, almost 80% of the population is engaged in small-scale agriculture as their primary livelihood and stunting rates have increased over the past decade in this district, in sharp contrast to the rest of Zimbabwe.
Though maize is a dietary staple widely consumed in various forms in Zimbabwe, vitamin A deficiency exerts a heavy toll on peopleâs health, particularly in rural communities where its impact is most keenly felt. The consequences, ranging from preventable blindness in children to heightened maternal mortality rates and reduced immune function, emphasize the urgency of sustainable interventions.
Preparation of âsadzaâ a local staple widely consumed in Zimbabwe. (Credit: Jill Cairns/Alan Cairns)
The first provitamin A maize variety was released in Zimbabwe over a decade ago. Subsequent breeding efforts, aiming to develop varieties capable of providing 50% of the estimated average requirement of vitamin A, have focused on increasing the provitamin A concentration in maize and yields obtained under a range of stresses that farmers frequently encounter. To date, 26 provitamin A varieties have been released in Southern Africa. However, several key research questions remained unanswered. For instance, how prevalent is vitamin A deficiency within vulnerable populations and what is the cost of an affordable diet providing enough vitamin A? Furthermore, can the nutritional concentration of provitamin A maize grown by smallholder farmers help significantly decrease vitamin A deficiency for the majority of rural households?
The nutritional concentration of biofortified crops is related to the environment they are grown in. Biofortified maize primarily targets resource-poor farmers, holding potential in addressing nutritional gaps. However, existing research on the potential health outcomes of the consumption of provitamin A has largely been centered on maize grown in controlled environments, such as on experimental research stations or commercial farms.
The CIMMYT-led study concludes that the consumption of provitamin A maize alone would not fully address vitamin A deficiency in the short-term, calling for additional interventions such as diet diversification, industrial fortification, and supplementation. Diet diversification is one viable option highlighted by the study: modelling showed most households could obtain a diet adequate in vitamin A from food produced on their farms or available in local markets at a cost that does not exceed the current cost of their diets.
In Murehwa District, the CIMMYT-led study estimated the daily costs of current diets at USD 1.43 in the wet season and USD 0.96 in the dry season. By comparison, optimization models suggest that diets adequate in vitamin A could be achieved at daily costs of USD 0.97 and USD 0.79 in the wet and dry seasons, respectively. Another study conducted in 2023 showed that almost half of the farms in the district had knowledge of PVA maize and its benefits but did not grow it, primarily due to a limited availability of seed.
CIMMYT and African partners, in conjunction with USAIDâs Feed the Future, have begun applying the MasAgro 
The 
While healthy soils and crops are key to improved harvests, ensuring safe and nutritious food production is critical to alleviating hunger and inequities in food access. CIMMYT engages with private sector stakeholders such as Bimbo, GRUMA, Ingredion, Syngenta, Grupo Trimex, PepsiCo, and Heineken, to mention a few, to âlink science, technology, and producers,â and ensure strong food systems, from the soils to the air and water, to transform vital cereals into safe foods to consume, like fortified bread and tortillas.
National governments play a critical role in ensuring that vulnerable populations are included in global approaches to strengthen food systems. Mexicoâs Secretary of Agriculture, Victor Villalobos, shared examples of how government intervention and political will through people-centered policies provides greater direct investment to agriculture and reduces poverty, increasing shared prosperity and peace. âAdvances must help to reduce gaps in development.â Greater access to improved agricultural practices and digital innovation maintains the field relevant for farmers and safeguards food security for society at large. Apart from Mexico, key government representatives from Bangladesh, Brazil, Honduras, India, and Vietnam reaffirmed their commitment to CIMMYTâs work.
