Skip to main content

Tag: wheat yield

Time Running Out to Avert Food Catastrophe, but There Is Hope

Written by dmedina on . Posted in Director General's corner, Features.

Time is of the essence, but we are not making the most of it in the fight against hunger. In 2015, world leaders agreed to set ambitious targets for addressing humanity’s most pressing concerns, which shaped the 2030 Agenda and became widely known as the Sustainable Development Goals (SDGs). We are only five years from 2030, but SDG 2 Zero Hunger has completely slipped through our fingers. In 2023, there were between 713 million and 757 million undernourished people in the world. The latest estimates point to an uncomfortable truth: hunger is on the rise, and we will not meet SDG 2 by the end of this decade.

The outlook is so bleak that 153 Nobel and World Food Prize recipients signed an open letter published on Jan. 14 calling on political and business leaders worldwide to seriously fund “moonshot” efforts to change our current trajectory and meet the food requirements of a global population of 9.7 billion people by 2050. The renowned signatories are sounding the alarm at the dawn of 2025 because it takes decades to reap the rewards of agricultural research and development programs, but also because yields of staple crops are stagnating or even declining around the world at a time when food production should increase between 50% to 70% over the next two decades to meet expected demand.

Joint 2024 World Food Prize Laureate and former U.S. Envoy for Global Food Security Cary Fowler coordinated the global appeal, which was discussed during a hearing with the US Senate Committee on Agriculture in Washington, D.C. The open letter published afterward listed the most promising scientific breakthroughs that should be prioritized to sustainably increase food production, including “improving photosynthesis in staple crops such as wheat and rice to optimize growth; developing cereals that can source nitrogen biologically and grow without fertilizer; as well as boosting research into hardy, nutrition-rich indigenous crops that have been largely overlooked for improvements.”

The good news is that we already have the platform of cutting-edge science to develop and scale up these innovations where they are most needed in Mexico and in nearly 90 countries where CIMMYT works with the support of an unrivalled network of international donors and local partners.

Increasing Wheat’s Ability to Capture, Use Sunlight

Varieties of wheat plants differ in their capacity to use sunlight to produce grain. The main goal of breeders is to increase wheat’s yield potential to harvest more grain sustainably and from the same area of arable land. At present, current breeding can increase wheat’s average yield potential by 1% annually, but it would be necessary to achieve average yield increases of at least 1.7% year after year to meet the expected demand by 2050. Research is focusing on photosynthesis in wheat spikes to boost yield potential. Spike photosynthesis adds on average 30% to grain yield of elite wheat lines developed at CIMMYT, but these gains can go as high as 60% in wheat’s wild relatives and landraces. The strategy is to tap into this underutilized potential to boost yields of modern wheat varieties that are also better adapted to a warming and drier world, and resistant to known and new pests and diseases. We wish to accelerate this research and are seeking a US$100 million investment in the platform.

Boosting Nitrogen Use Efficiency in Wheat

Wheat is the world’s largest nitrogen fertilizer consumer, which contributes significantly to greenhouse gas emissions and soil degradation. Groundbreaking research led by CIMMYT is increasing wheat’s ability to use nitrogen more efficiently, thereby reducing its dependency on nitrogen fertilizer by between 15% to 20%, depending on regional farming systems. Increased nitrogen use efficiency has been achieved after successfully transferring a natural ability to inhibit biological nitrification from wheat’s wild relatives to modern wheat varieties. Biological nitrification inhibition (BNI) is a natural process that provides wheat plants with a more sustained source of nitrogen available in the soil, thereby increasing their nitrogen use efficiency. BNI wheat is a game-changing innovation that will contribute to significantly reducing agriculture’s nitrogen footprint sustainably without compromising yields or grain quality. While the BNI research platform has received its first investment for wheat, an additional investment of US$30 million per crop would expand the platform to maize, millet, and sorghum.

Improving and Scaling Up ‘Opportunity Crops’

CIMMYT recently partnered with the United Nations Food and Agriculture Organization (FAO) to advance the global Vision for Adapted Crops and Soils (VACS) endorsed by the G7, which aims to sustainably increase the production of diverse, nutritious, and climate-adapted indigenous and traditional food crops grown on healthy soils. We have identified seven “opportunity crops,” including pearl millet, finger millet, pigeon pea, cowpea, mung bean, and amaranth, that can be grown sustainably and significantly improve nutrition and food security in sub-Saharan Africa. At present, the VACS partner network is working hard to develop new varieties of these opportunity crops and to build pathways for African farmers to access improved seeds and markets for their produce. The soil component of the VACS movement is underfunded, so we are looking for a US$500 million investment to launch a strong VACS Soils initiative.

A Parting Shot

Improved photosynthesis and increased nitrogen use efficiency in wheat, and nutrient-dense indigenous crops are exciting “moonshot” efforts already building resilient food systems that may help humanity avert a global food catastrophe in two decades’ time. But political will and available funding for agricultural research and development will ultimately determine if these and many more urgently needed scientific breakthroughs will reach their full potential in the fight against hunger in a more food insecure and unstable world.

Bram Govaerts is CIMMYT’s director general. He is an international authority in maize, wheat and associated cropping systems who works for a successful transformation of small-scale farming in Africa, Asia and Latin America. Govaerts advises public, private and social organizations worldwide and is an active member of research groups and associations, including the American Society of Agronomy and Cornell University’s Andrew D. White Professors-at-Large Program.

Read the original article

CIMMYT wheat varieties help Ethiopia’s farmers mitigate devastating rust diseases

Written by mcallejas on . Posted in Publications.

Ethiopia is the largest wheat producer in East Africa, with about 65% share of the total wheat production in sub-Saharan Africa. The area under wheat increased from about 1.5 million hectares in 2010 to 2.5 million hectares in 2023. More importantly, the productivity increased from 1.8 tons per hectare to about 3 tons per hectare in the same period, implying an increase of about 5% per annum in productivity (See Figure 1).

Several factors have contributed to this spectacular increase in productivity, including better farm practices implemented through clustering farmers land to reduce production costs, and introducing new, improved varieties which enable farmers to withstand challenges of crop diseases.

Figure 1: Wheat grain yield trends in Ethiopia by decade, 1960 to 2022 (USDA data).

A DNA finger printing study found that about 87% of the wheat area in Ethiopia comprises of varieties developed by the International Maize and Wheat Improvement Center (CIMMYT). In 2023, the Ethiopian Institute of Agricultural Research (EIAR) released six new wheat varieties of CIMMYT origin aimed for the mid to highlands (> 1800 meters above sea level) and lowlands (< 1800 masl) of the country. “These newly released varieties provide options for farmers to face devastating rust diseases and at the same time obtain higher productivity,” said wheat breeder Leonardo Crespo.

Gadisa Alemu, wheat breeder based in EIAR, Kulumsa, added that the CIMMYT varieties were tested in farmers’ fields prior to release. “This allows participating farmers to have quicker access to seed of selected varieties,” he said.

Wheat breeders . The aim was to obtain additional insights into the activities of CIMMYT’s partners and co-design a strategy that allows early evaluation and access to CIMMYT germplasm by national partners in Ethiopia. The team visited research centers in Holetta (highlands), Debre Zeit and, Kulumsa (midlands), and Arsi Negele (lowlands). Kulumsa, together with the highlands of Meraro and Asasa plains, represent about 60-70% of the wheat area in Ethiopia.  “These are important sites for wheat breeding activities in Ethiopia. Given that Holetta and Debre Zeit are hot spots for diseases, there is an increased interest in the Arsi Negele region to expand wheat production under irrigated conditions,” said Bekele Abeyo, wheat breeder and CIMMYT’s Ethiopia Country Representative.

AGG Maize and Wheat Improvement Teams Meet with Partners to Develop CG-NARES Breeding Strategy

In the first fortnight of September 2023, researchers from the International Maize and Wheat Improvement Center (CIMMYT) and National Agriculture Research and Extension System (NARES) met in Nairobi, Kenya to create high-level strategies and guiding principles for CG-NARES breeding activities. This is in alignment with the ‘Genetic Innovations’ initiative of the One CGIAR strategy. CIMMYT representation included breeding teams from the wheat, maize, and dryland crops. The meetings were organized by Bill & Melinda Gates Foundation and CIMMYT’s Accelerating Genetic Gains in Maize and Wheat (AGG) project team.

It was recognized that the aforesaid strategies and principles need to be based on the biology of the crops and the context of each breeding program; incorporate the logistics of the breeding operations; and implement data driven tools for decision making such as genomic selection.

Participants shared how the application of novel and innovative technologies shortens the breeding cycles, accelerates the rate of genetic gain, and provides tools to enable the evaluation of plant materials (future variety candidates) and future target environments where these varieties will be grown.

It was concluded that effective breeding networks can be a strong instrument to enable faster delivery of improved germplasm to farmers. For this to happen efficiently, the networks require a high degree of coordination, organizational structure, governance, and clarity of roles. “It is fundamental for network members to agree the objectives, vision and expected outcomes of collaborative activities. This forms the basis for co-design and co-implementation of crop improvement plans” said Kevin Pixley, Interim Director of the Global Wheat Program and Director of the Dryland Crops Program.

The meeting also served as a platform for AGG’s and dryland crop’s breeding teams to exchange ideas and experiences. For instance, the Maize team shared their experience and learnings from on-farm-testing activities. The Wheat team shared the evolution and path of breeding modernization and implementation of new technologies. The Dryland Crops team shared their experience with co-designing and co-implementing breeding networks with NARES partners in Africa.

Climate change to reduce Africa, South Asia wheat output

Written by mcallejas on . Posted in In the media.

Several factors, including temperature, water deficit, and water access, have been identified as major causes in recent wheat yield variability worldwide. DSSAT wheat models showcase the impact of temperature, heat stress, water balance and drought stress in large wheat yield reductions due to climate change for Africa and South Asia, where food security is already a problem.

Read the full story here

 

 

 

Wheat output in Africa and South Asia will suffer severely from climate change by 2050, modelling study shows

Written by Julian Bañuelos-Uribe on . Posted in Publications.

Leading crop simulation models used by a global team of agricultural scientists to simulate wheat production up to 2050 showed large wheat yield reductions due to climate change for Africa and South Asia, where food security is already a problem.

The model predicted average declines in wheat yields of 15% in African countries and 16% in South Asian countries by mid-century, as described in the 2021 paper “Climate impact and adaptation to heat and drought stress of regional and global wheat production,” published in the science journal Environmental Research Letters. Climate change will lower global wheat production by 1.9% by mid-century, with the most negative impacts occurring in Africa and South Asia, according to the research.

“Studies have already shown that wheat yields fell by 5.5% during 1980-2010, due to rising global temperatures,” said Diego N.L. Pequeno, wheat crop modeler at the International Maize and Wheat Improvement Center (CIMMYT) and lead author of the paper. “We chose several models to simulate climate change impacts and also simulated wheat varieties that featured increased heat tolerance, early vigor against late season drought, and late flowering to ensure normal biomass accumulation. Finally, we simulated use of additional nitrogen fertilizer to maximize the expression of these adaptive traits.”

Wheat fields in Ankara, Turkey, where data was used for crop model simulation (Photo: Marta Lopes/CIMMYT)

The wheat simulation models employed — CROPSIM-CERES, CROPSIM, and Nwheat within the Decision Support System for Agrotechnology Transfer, DSSAT v.4.6 — have been widely used to study diverse cropping systems around the world, according to Pequeno.

“The DSSAT models simulated the elevated CO2 stimulus on wheat growth, when N is not limiting,” he said. “Our study is the first to include combined genetic traits for early vigor, heat tolerance, and late flowering in the wheat simulation.”

Several factors, including temperature, water deficit, and water access, have been identified as major causes in recent wheat yield variability worldwide. The DSSAT wheat models simulate the impact of temperature, including heat stress, water balance, drought stress, or nitrogen leaching from heavy rainfall.

“Generally, small and low-volume wheat producers suffered large negative impacts due to future climate changes, indicating that less developed countries may be the most affected,” Pequeno added.

Climate change at high latitudes (France, Germany, and northern China, all large wheat-producing countries/region) positively impacted wheat grain yield, as warming temperatures benefit wheat growth through an extended early spring growing season. But warmer temperatures and insufficient rainfall by mid-century, as projected at the same latitude in Russia and the northwestern United States, will reduce rainfed wheat yields — a finding that contradicts outcomes of some previous studies.

At lower latitudes that are close to the tropics, already warm, and experiencing insufficient rainfall for food crops and therefore depending on irrigation (North India, Pakistan, Bangladesh), rising heat will damage wheat crops and seriously reduce yields. China, the largest wheat producer in the world, is projected to have mixed impacts from climate change but, at a nation-wide scale, the study showed a 1.2% increase in wheat yields.

“Our results showed that the adaptive traits could help alleviate climate change impacts on wheat, but responses would vary widely, depending on the growing environment and management practices used,” according to Pequeno. This implies that wheat breeding for traits associated with climate resilience is a promising climate change adaptation option, but its effect will vary among regions. Its positive impact could be limited by agronomical aspects, particularly under rainfed and low soil N conditions, where water and nitrogen stress limit the benefits from improved cultivars.

Extreme weather events could also become more frequent. Those were possibly underestimated in this study, as projections of heat damage effects considered only changes in daily absolute temperatures but not possible changes in the frequency of occurrence. Another limitation is that most crop models lack functions for simulating excess water (e.g., flooding), an important cause of global wheat yield variability.

This study was supported by the CGIAR Research Program on Wheat agri-food systems (CRP WHEAT; 2012-2021), the CGIAR Platform for Big Data in Agriculture, the International Wheat Yield Partnership (IWYP115 Project), the Bill & Melinda Gates Foundation, the World Bank, the Mexican government through the Sustainable Modernization of Traditional Agriculture (MasAgro) project, and the International Treaty of Plant Genetic Resources for Food and Agriculture and its Benefit-sharing Fund for co-funding the project, with financial support from the European Union.

China, Pakistan launched joint wheat breeding lab

Written by Sarah McLaughlin on . Posted in In the media.

On March 2, the China-Pakistan Joint Wheat Molecular Breeding International Lab (“Joint Lab”) was launched, funded by the Science and Technology Partnership Program, Ministry of Science and Technology of China, with the joint support from China‘s Ministry of Agriculture and Rural Affairs, National Agriculture Research Center of Pakistan and the International Maize and Wheat Improvement Center (CIMMYT).

The joint lab aims to develop new varieties with high yield and resistance to disease, enhancing breeding capacity and wheat production in Pakistan, where wheat is the largest food crop.

Read the original article: China, Pakistan launched joint wheat breeding lab

Ethiopia’s Experience of Wheat Production Exemplary to African Countries: CIMMYT

Written by Sarah McLaughlin on . Posted in In the media.

Rabe Yahaya, agricultural mechanization expert at the International Maize and Wheat Improvement Center (CIMMYT), spoke to the Ethiopian News Agency (ENA) about the country’s wheat production.

Ethiopia is the second largest wheat grower in Africa and has high levels of demand for the crop. Shortages of grains, cereals and agricultural inputs such as fertilizer caused by the Russia-Ukraine conflict are leading the Ethiopian government to focus heavily on increasing the country’s productivity to rely less on imports.

Prime Minister Abiy Ahmed recently launched national exports of wheat/ “We have made Ethiopia’s wheat export dream a reality,” he said.

Yahaya highlighted the role of CIMMYT in improving Ethiopia’s wheat production; around 70 percent of varieties grown in the country come from the organization’s germplasm. He also praised Ethiopia’s tax free imports on agricultural machineries and strong extension system, saying that other countries could learn from the success of these initiatives.

The interview took place at a working group on mechanization organized by the Green Innovation Centers (GIC) and CIMMYT to promote the use of machinery in agriculture.

Read the original article: Ethiopia’s Experience of Wheat Production Exemplary to African Countries: CIMMYT

A deceptively simple hack boosts wheat yields in Bihar

Written by Sarah McLaughlin on . Posted in Features.

As a warming planet desiccates crops around the world, threatening livelihoods and nutrition, farmers in Bihar, India, are boosting their wheat yields with a deceptively simple adaptation.

“Farmers can plant their wheat crop several weeks earlier, so that their wheat matures earlier and they are able to harvest their wheat before the heat gets bad,” said Amit Kumar Srivastava, a scientist with the International Rice Research Institute in India. “Traditionally, farmers in Bihar planted their wheat in mid-December. This put their crop at risk of what’s called ‘terminal heat’ – high heat during a critical growth stage that impacts the yields. We’ve advised them to begin planting by November 20.”

Bihar is blessed with good soil and adequate water resources. But its yields have been lagging below India’s average. Today, the average hectare of Bihar farmland produces 2.9 tons of wheat – significantly below the average yield in India of 3.4 tons.

Rising heat threatened to reduce this harvest even further. Wheat, like people, can suffer from heat stress. Researchers have found that an increase of just one-degree Celsius cuts wheat yields by 6%. In high heat conditions, wheat produces fewer, smaller grains, potentially impacting nutrition and livelihoods. Bihar, one of the poorest states in India, is considered a climate change hotspot and temperatures are expected to rise by up to 1 degree Celsius by 2050. India can ill afford declining farm yields. In fact, it needs to increase its wheat yields from around 110 million tons to 140 million tons by 2050 just to keep pace with domestic demand.

This seemingly simple adaptation was actually quite complicated to develop, explained Sonam Sherpa, a spatial agronomist with the Sustainable Agrifood Systems (SAS) program of the International Maize and Wheat Improvement Center. “It required researchers to look at the agricultural system as a whole. We had to understand why farmers were planting so late. And we learned it was because they were waiting for their rice crop to mature. And they couldn’t plant their rice crop earlier because they were waiting for the monsoon rains, which are unpredictable in Bihar. Understanding the system as a whole, led us to recommend a rice variety that matures earlier and to develop weather forecasting tools and systems that can communicate with farmers when the monsoon rains are expected. That will help farmers move forward with planting their rice earlier, allowing for an earlier harvest. And then planting and harvesting their wheat earlier.”

To demonstrate the potential of this shift, researchers established demonstration fields throughout the state and brought government officials and farmers to see the difference.

It was striking. Across the state, farmers who adopted early rice harvesting and early wheat planting grew nearly one ton more of wheat on each hectare than those who planted late – a 36% increase in yield. At the most extreme ends of the planting spectrum the difference in yield is hard to overstate; the difference in yields between the wheat planted in early November versus the wheat planted in late December was 69%. That’s enough of a boost to turn Bihar from a net wheat importer to a breadbasket for the region.

“Seeing is believing,” said Srivastava. As of the 2020-21 wheat growing season, an estimated 22% of farmers in the target districts – about half a million farmers with an estimated 0.83 million hectares of land – have shifted to different varieties of rice that allow them to plant their wheat earlier. Similar gains could be seen elsewhere in Eastern India, research indicates, if the rice-wheat system is managed as a system.

Researchers also established relationships with private sector seed distributors who often advise farmers and help them identify and adopt different varieties of rice that allow for earlier harvesting. “The lesson here is that even with climate change, we can increase production by optimizing agricultural systems,” said Srivastava.

Read the original article: A deceptively simple hack boosts wheat yields in Bihar

Cover photo: A deceptively simple hack boosts wheat yields in Bihar. (Photo: Reuters)

Exotic wheat DNA helps breed ‘climate-proof’ crops

Written by Sarah McLaughlin on . Posted in In the media.

A new study has determined that wheat with exotic DNA from wild relatives benefits from up to 50 percent higher yields in hot weather, compared with elite lacks lacking these genes.

The study by the International Maize and Wheat Improvement Center (CIMMYT) and the Earlham Institute examined how exotic alleles contribute to wheat heat tolerance in different field conditions based on field trials in Sonora, Mexico.

“Crossing elite lines with exotic material has its challenges,” said Matthew Reynolds, co-author of the study and leader of Wheat Physiology at CIMMYT. “There’s a well-recognized risk of bringing in more undesirable than desirable traits, so this result represents a significant breakthrough in overcoming that barrier and the continued utilization of genetic resources to boost climate resilience.”

These results can be used to improve crop resilience and food security in the face of the challenges posed by climate change, as well as emphasizing the importance of genetic diversity in key crops where selective breeding has reduced adaptability.

Read the original article: Exotic wheat DNA helps breed ‘climate-proof’ crops

Research shows impact of root and crown rot in wheat

Written by Sarah McLaughlin on . Posted in Publications.

Kazakhstan is the ninth largest country in the world and the fourteenth largest producer of wheat; in 2021 alone, the country produced 14.3 million tons (t) of wheat on 12.1 million hectares (ha). Despite this impressive figure, wheat yield in the country falls below average at 1172.5 t/ha compared to 3474.4 t/ha globally.

Research into wheat diseases in Kazakhstan has primarily revolved around airborne fungal foliar diseases, such as stem rust, leaf rust and stripe rust, which can be devastating for farmers and their crops. However, the effects of fungi relating to wheat root and crown root were yet to be examined – these diseases affect yields, stands and grain quality due to infections that cause damping-off, blight, necrosis, and dry rotting.

Using plant samples taken during the 2019 growing season, scientists from the International Maize and Wheat Improvement Center (CIMMYT) conducted a quantitative survey to determine the distribution of this fungi. Using morphological and molecular tools on 1,221 samples from 65 sites across the central, eastern, and southeastern region, scientists found that Bipolaris sorokiniana and Fusarium acuminatum were the most predominant fungal species isolated.

In total, 74 isolates from 16 species were tested, revealing that F. culmorum and F. pseudograminearum, B. sorokinaiana, Fusarium sp., R. solani, F. redolens, C. spicifera, C. inaequalis, and N. orvzae were virulent fungi.

Results show the diverse spectrum of pathogenic fungal species linked to wheat crown and root rot in Kazakhstan and is highly likely to be the first report from the country on the presence of F. seudograminearum, Fusarium sp., C. spicifera, and C. inaequalis.

With this new data, scientists can develop mitigations to prevent crop loss and improve wheat yield across Kazakhstan.

Read the study: Fungal Pathogens Associated with Crown and Root Rot of Wheat in Central, Eastern, and Southeastern Kazakhstan

Cover photo: The scientists from Turkey researching root and crown rot in Kazakhstani wheat: Abdelfattah A. Dababat (CIMMYT), Mustafa Imren (Bolu Abant Izzet Baysal University), Göksel Özer (Bolu Abant Izzet Baysal University) and Rauan Zhapayev. (Photo: Abdelfattah A. Dababat/CIMMYT)

Combatting soil-borne pathogens and nematodes vital for food security

Written by Sarah McLaughlin on . Posted in News.

Mustafa Alisarli, Bolu Abant Izzet Baysal University rector, is awarded for hosting this symposium by the representative of the Turkish Ministry of Agriculture and Forestry, General Directorate of Agricultural Research and Policies (GDAR), Dr Suat Kaymak.

The International Maize and Wheat Improvement Center (CIMMYT) coordinated the VIII International Cereal Nematode Symposium between September 26-29, in collaboration with the Turkish Ministry of Agriculture and Forestry, the General Directorate of Agricultural Research and Policies and Bolu Abant Izzet Baysal University.

As many as 828 million people struggle with hunger due to food shortages worldwide, while 345 million are facing acute food insecurity – a crisis underpinning discussions at this symposium in Turkey focused on controlling nematodes and soil-borne pathogens causing reduced wheat yields in semi-arid regions.

A major staple, healthy wheat crops are vital for food security because the grain provides about a fifth of calories and proteins in the human diet worldwide.

Seeking resources to feed a rapidly increasing world population is a key part of tackling global hunger, said Mustafa Alisarli, the rector of Turkey’s Bolu Abant Izzet Baysal University in his address to the 150 delegates attending the VIII International Cereal Nematode Symposium in the country’s province of Bolu.

Suat Kaymak, Head of the Plant Protection Department, on behalf of the director general of the General Directorate of Agricultural Research and Policies (GDAR), delivered an opening speech, emphasizing the urgent need to support the CIMMYT Soil-borne Pathogens (SBP) research. He stated that the SBP plays a crucial role in reducing the negative impact of nematodes and pathogens on wheat yield and ultimately improves food security. Therefore, the GDAR is supporting the SBP program by building a central soil-borne pathogens headquarters and a genebank in Ankara.

Discussions during the five-day conference were focused on strategies to improve resilience to the Cereal Cyst Nematodes (Heterodera spp.) and Root Lesion Nematodes (Pratylenchus spp.), which cause root-health degradation, and reduce moisture uptake needed for proper development of wheat.

Richard Smiley, a professor emeritus at Oregon State University, summarized his research on nematode diseases. He has studied nematodes and pathogenic fungi that invade wheat and barley roots in the Pacific Northwest of the United States for 40 years. “The grain yield gap – actual versus potential yield – in semiarid rainfed agriculture cannot be significantly reduced until water and nutrient uptake constraints caused by nematodes and Fusarium crown rot are overcome,” he said.

Experts also assessed patterns of global distribution, exchanging ideas on ways to boost international collaboration on research to curtail economic losses related to nematode and pathogen infestations.

A special session on soil-borne plant pathogenic fungi drew attention to the broad spectrum of diseases causing root rot, stem rot, crown rot and vascular wilts of wheat.

Soil-borne fungal and nematode parasites co-exist in the same ecological niche in cereal-crop field ecosystems, simultaneously attacking root systems and plant crowns thereby reducing the uptake of nutrients, especially under conditions of soil moisture stress.

Limited genetic and chemical control options exist to curtail the damage and spread of these soil-borne problems which is a challenge exacerbated by both synergistic and antagonistic interactions between nematodes and fungi.

Nematodes, by direct alteration of plant cells and consequent biochemical changes, can predispose wheat to invasion by soil borne pathogens. Some root rotting fungi can increase damage due to nematode parasites.

Integrated managementFor a holistic approach to addressing the challenge, the entire biotic community in the soil must be considered, said Hans Braun, former director of the Global Wheat Program at CIMMYT.

Braun presented efficient cereal breeding as a method for better soil-borne pathogen management. His insights highlighted the complexity of root-health problems across the region, throughout Central Asia, West Asia and North Africa (CWANA).

Richard A. Sikora, Professor emeritus and former Chairman of the Institute of Plant Protection at the University of Bonn, stated that the broad spectrum of nematode and pathogen species causing root-health problems in CWANA requires site-specific approaches for effective crop health management. Sikora added that no single technology will solve the complex root-health problems affecting wheat in the semi-arid regions. To solve all nematode and pathogen problems, all components of integrated management will be needed to improve wheat yields in the climate stressed semi-arid regions of CWANA.

Building on this theme, Timothy Paulitz, research plant pathologist at the United States Department of Agriculture Agricultural Research Service (USDA-ARS), presented on the relationship between soil biodiversity and wheat health and attempts to identify the bacterial and fungal drivers of wheat yield loss. Paulitz, who has researched soil-borne pathogens of wheat for more than 20 years stated that, “We need to understand how the complex soil biotic ecosystem impacts pathogens, nutrient uptake and efficiency and tolerance to abiotic stresses.”

Julie Nicol, former soil-borne pathologist at CIMMYT, who now coordinates the Germplasm Exchange (CAIGE) project between CIMMYT and the International Center for Agricultural Research in the Dry Areas (ICARDA) at the University of Sydney’s Plant Breeding Institute, pointed out the power of collaboration and interdisciplinary expertise in both breeding and plant pathology. The CAIGE project clearly demonstrates how valuable sources of multiple soil-borne pathogen resistance in high-yielding adapted wheat backgrounds have been identified by the CIMMYT Turkey program, she said. Validated by Australian pathologists, related information is stored in a database and is available for use by Australian and international breeding communities.

Economic losses

Root-rotting fungi and cereal nematodes are particularly problematic in rainfed systems where post-anthesis drought stress is common. Other disruptive diseases in the same family include dryland crown and the foot rot complex, which are caused mainly by the pathogens Fusarium culmorum and F. pseudograminearum.

The root lesion nematode Pratylenchus thornei can cause yield losses in wheat from 38 to 85 percent in Australia and from 12 to 37 percent in Mexico. In southern Australia, grain losses caused by Pratylenchus neglectus ranged from 16 to 23 percent and from 56 to 74 percent in some areas.

The cereal cyst nematodes (Heterodera spp.) with serious economic consequences for wheat include Heterodera avenae, H. filipjevi and H. latipons. Yield losses due to H. avenae range from 15 to 20 percent in Pakistan, 40 to 92 percent in Saudi Arabia, and 23 to 50 percent in Australia.

In Turkey, Heterodera filipjevi has caused up to 50 percent crop losses in the Central Anatolia Plateau and Heterodera avenae has caused up to 24 percent crop losses in the Eastern Mediterranean.

The genus Fusarium which includes more than a hundred species, is a globally recognized plant pathogenic fungal complex that causes significant damage to wheat on a global scale.

In wheat, Fusarium spp. cause crown-, foot-, and root- rot as well as head blight. Yield losses from Fusarium crown-rot have been as high as 35 percent in the Pacific Northwest of America and 25 to 58 percent in Australia, adding up losses annually of $13 million and $400 million respectively, due to reduced grain yield and quality. The true extent of damage in CWANA needs to be determined.

Abdelfattah Dababat, CIMMYT’s Turkey representative and leader of the soil-borne pathogens research team said, “There are examples internationally, where plant pathologists, plant breeders and agronomists have worked collaboratively and successfully developed control strategies to limit the impact of soil borne pathogens on wheat.” He mentioned the example of the development and widespread deployment of cereal cyst nematode resistant cereals in Australia that has led to innovative approaches and long-term control of this devastating pathogen.

Dababat, who coordinated the symposium for CIMMYT, explained that, “Through this symposium, scientists had the opportunity to present their research results and to develop collaborations to facilitate the development of on-farm strategies for control of these intractable soil borne pathogens in their countries.”

Paulitz stated further that soil-borne diseases have world-wide impacts even in higher input wheat systems of the United States. “The germplasm provided by CIMMYT and other international collaborators is critical for breeding programs in the Pacific Northwest, as these diseases cannot be managed by chemical or cultural techniques,” he added.

Closing ceremony of the International Cereal Nematode Symposium. From left to right; Hans Braun, Brigitte Slaats, Richard Sikora, Grant Hollaway, Mesut Keser, Zahra Maafi, Richard Smiley, Mustafa Imren, Fatih Ozdemir, Amer Dababat. (Photo: CIMMYT)

Road ahead

Delegates gained a greater understanding of the scale of distribution of cereal cyst nematodes and soil borne pathogens in wheat production systems throughout West Asia, North Africa, parts of Central Asia, Northern India, and China.

After more than 20 years of study, researchers have recognized the benefits of planting wheat varieties that are more resistant. This means placing major emphasis on host resistance through validation and integration of resistant sources using traditional and molecular methods by incorporating them into wheat germplasm for global wheat production systems, particularly those dependent on rainfed or supplementary irrigation systems.

Sikora stated that more has to be done to improve Integrated Pest Management (IPM), taking into consideration all tools wherever resistant is not available. Crop rotations for example have shown some promise in helping to mitigate the spread and impact of these diseases.

“In order to develop new disease-resistant products featuring resilience to changing environmental stress factors and higher nutritional values, modern biotechnology interventions have also been explored,” Alisarli said.

Brigitte Slaats and Matthias Gaberthueel, who represent Swiss agrichemicals and seeds group Syngenta, introduced TYMIRIUM® technology, a new solution for nematode and crown rot management in cereals. “Syngenta is committed to developing novel seed-applied solutions to effectively control early soil borne diseases and pests,” Slaats said.

It was widely recognized at the event that providing training for scientists from the Global North and South is critical. Turkey, Austria, China, Morocco, and India have all hosted workshops, which were effective in identifying the global status of the problem of cereal nematodes and forming networks and partnerships to continue working on these challenges.

Increasing yield gain in Afghanistan

Written by Sarah McLaughlin on . Posted in Publications.

Faced with climate change and having to keep pace in the race to feed the world’s growing population, farmers of staple crops like wheat are under pressure to constantly increase yield per hectare.

Increasing yield gains is especially important in Afghanistan, where per capita consumption of wheat is nearly three times more than the global average and wheat accounts for up to 60% of daily caloric intake of the average Afghan citizen.

The International Maize and Wheat Improvement Center (CIMMYT) develops and distributes improved seed targeted toward diverse wheat growing regions in the developing world, including Afghanistan, a net importer of wheat. A study by CIMMYT scientists, published in Crop Science, measured yield gain and improvement in a variety of traits of CIMMYT developed varieties compared against local wheat, over a 14-year period. The results showed the CIMMYT varieties confer yield gains, contributing to an increase in Afghanistan’s wheat productivity.

In terms of yield, the CIMMYT varieties showed an increase of 123 kilograms per hectare (kg/ha) over the time interval studied, compared to 107 kg/ha for local varieties.

“This study shows continual increases in yield from CIMMYT varieties across Afghanistan,” said lead author Rajiv Sharma. “This shows the potential of genetically improved germplasm to increase yields, strengthen resistance to diseases and improve other important traits.”

Researchers also examined specific traits, like days to heading and overall plant height. Days to heading refers to the number of days from planting to when the plant is ready to be harvested and overall plant height is the highest measurement a plant reaches. This is important because if a wheat plant grows too high, it will lodge (fall over) under its own weight, rendering it non-harvestable.

Across the CIMMYT varieties there was a 1.8 day per year reduction in days to heading. This is a positive sign for Afghan wheat production as research has shown that crop durations will be reduced because of climate-associated stresses. Shorter crop duration also reduces the cost of crop production, since shorter crop duration reduces the requirements for water, labor, fertilizer, and other resources.

In terms of plant height, the CIMMTY varieties showed a gain of 0.77 cm per year. Although a negative correlation between plant height and grain yield has been reported in other studies, this is not the case in Afghanistan. Increased plant height is often an indicator of higher biomass (the amount of aboveground volume including leaves and stems which might fall to the ground) which drives higher yield, provided the plant does not lodge. Higher biomass is also required in many developing countries, including Afghanistan, to produce straw that is used dry fodder feed for livestock. This appears to result from selections to increase overall production, mitigate negative impacts and fulfil the changing preference of farmers.

“This kind of evaluation is important in determining the efficacy of CIMMYT’s efforts to provide  improved wheat varieties tailored to diverse production environments around the world,” said Alison Bentley, co-author of the study and director of CIMMYT’s Global Wheat Program. “It also makes a strong case for continued investment in plant breeding and for the collaboration between Afghanistan and CIMMYT.”

Read the study: Plant breeding increases spring wheat yield potential in Afghanistan

Cover photo: Farmers working in a field in the Shibar Valley in Bamian province, Afghanistan. (Adam Ferguson/The New York Times)

Singh recognized for wheat crop improvement

Written by Sarah McLaughlin on . Posted in News.

Ravi Singh delivers a lecture during the 61st All India Wheat and Barley Research Workers’ Meet celebrating the fruitful partnership of CIMMYT and ICAR. (Credit: SAWBAR)

Ravi Singh, head of wheat improvement and rust research at the International Maize and Wheat Improvement Center (CIMMYT), received the Sh. VS Mathur Memorial Award 2022 for outstanding contribution in the field of wheat crop improvement from the Society for Advancement of Wheat and Barley Research (SAWBAR).

Singh received the award from T. R. Sharma, Deputy Director General of the Indian Council of Agricultural Research (ICAR) and G. P. Singh, Director of the Indian Institute for Wheat and Barley Research (IIWBR) at ICAR.

As recipient of the award, Singh delivered a lecture during the 61st All India Wheat and Barley Research Workers’ Meet in Gwalior, India, on August 29. He highlighted and praised the partnership between India and CIMMYT as essential for accelerating gains in wheat yield despite the stresses of climate change thanks to improved resilience in new varieties and earlier sowing.

“The ICAR-CIMMYT wheat improvement partnership remains crucial for delivering new varieties with higher rates of genetic gain in farmers’ fields to enhance productivity, climate resilience, disease resistance and nutrition while meeting market needs,” he said.

Successes of the partnership include integrated breeding with a common agenda, commercialized varieties that are adapted to flexible sowing dates including early sowing, diverse and durable resistance to rust diseases, adoption of wheat blast resistant varieties in large areas, biofortified and high-quality varieties, and the move towards mainstreaming of zinc (Zn) biofortification.

Singh also paid homage to the award’s namesake, as VS Mathur’s “wheat varieties once occupied fields of many millions of farmers and provided food and nutrition to many more millions throughout India and beyond”.

Singh, a CIMMYT scientist, receives the Sh. VS Mathur Memorial Award for his outstanding contribution in the field of wheat crop improvement. (Credit: SAWBAR)

About SAWBAR:

SAWBAR was founded in 2007 and is housed at ICAR-Indian Institute of Wheat and Barley Research Karnal (Haryana) India. The Society presently has 300 life members and more than 320 annual and student members. SAWBAR is playing a significant role in bringing wheat and barley researchers on one platform for the exchange of innovative research and dissemination of knowledge related to the latest research happenings in the area of wheat and barley improvement. Annually, SAWBAR gives awards to pioneer cereal workers in various award categories. 

About the Sh. VS Mathur Mathur Memorial Award:

The Sh. VS Mathur Memorial Award was constituted in year 2018 in the memory of eminent wheat worker Sh. VS Mathur. Mathur was one of the pioneer wheat workers who worked tirelessly with MS Swaminathan and HK Jain and developed a large number of high-yielding wheat varieties viz. Heera, Moti, Janak (HD 1982), Arjun (HD 2009), HD 2177, HD 2182, HD 2204, HD 2236, HD 2278, HD 2281, HD 2285, HD 2329, HD 2307 and HD 2327 for various regions of India.

Achieving sixty years of wheat yield increase

Written by Celine Lim on . Posted in Publications.

Achieving greater food security requires a continued increase in global wheat yields, which the developing world plays a central role in meeting. Newly published research covering 60 years of wheat yield trends in the Yaqui Valley, Mexico, provides insights into how farmers can increase yields to address this need.

By dividing the 60-year interval into three 20-year periods between 1960-2019 and correcting farm yield for the strong influence of inter-annual variation in January to March minimum temperature, scientists from Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the International Maize and Wheat Improvement Center (CIMMYT) have taken steps towards advancing the sustainability of the Valley’s wheat cropping system by studying farm yield for the irrigated spring wheat production environment.

Total yield increase, corrected for temperature and CO2 rise, relative to average yield in each period, was 4.17%, 0.47%, and 1.59% p.a. for 1960–79, 1980–99, and 2000–19, respectively. The breeding component, estimated by the increase in the Varietal Yield Index in farmers’ fields, rose at 0.97%, 0.49%, and 0.71% p.a., respectively. The remaining yield change (3.16, -0.02%, and 0.87% p.a., respectively) comprised the net effect of improved crop management (agronomic progress), plus that of off-farm changes.

In the first period, off-farm developments were bolstered by strong government financial support whereas developments in the second period were hindered by the breakdown of the traditional smallholder land system and withdrawal of government support. The final period experienced better prices and improved access to technical advice.

Wheat is likely to continue playing a dominant role in the Yaqui Valley for the next 20-year period, especially from potential yield increase through breeding. However, closing the yield gap is becoming more challenging due to fluctuations in energy price, goals to achieve net zero CO2 and environmental signals. The biophysical sustainability of the Valley’s wheat cropping system requires urgent actions through better fertilizer management, greater cropping diversity, integrated management of biotic threats, acceptance of no-till, residue retention and controlled traffic.

Lessons from the Yaqui Valley bear importance for global wheat security given that without area increase and new technologies, food security will increasingly depend on developing countries.

Read the full publication here: Sixty years of irrigated wheat yield increase in the Yaqui Valley of Mexico: Past drivers, prospects and sustainability

Cover photo: Workers sowing wheat into sorghum residue. (Credit: CIMMYT)

CIMMYT enumerators hold booklets with vignettes before their interaction with family farmers Kiran Devi (second from left) and Rishikesh Ram (third from left). (Photo: Nima Chodon /CIMMYT)

Researchers use storytelling to evaluate women’s agency in agricultural production

Written by Nima Chodon on . Posted in News.

CIMMYT enumerators hold booklets with vignettes before their interaction with family farmers Kiran Devi (second from left) and Rishikesh Ram (third from left). (Photo: Nima Chodon /CIMMYT)
CIMMYT enumerators hold booklets with vignettes before their interaction with family farmers Kiran Devi (second from left) and Rishikesh Ram (third from left). (Photo: Nima Chodon /CIMMYT)

Researchers from the International Maize and Wheat Improvement Center (CIMMYT) are conducting a study in the state of Bihar, India, to improve our understanding of women’s and men’s contributions to decision-making around wheat crop management. The results will help reach women with new varieties that meet their needs and priorities.

The study seeks to overcome a big challenge for research organizations and national policymakers: to design a better framework for faster turnover of improved varieties and increased access to women and marginalized farmers.

Wheat is the second-largest crop grown in Bihar after rice, with a production of 5-6 million tonnes of it every year. Despite women’s contributions to farming activities, from sowing to harvesting, traditional gender norms can undermine their access to productive resources and influence household decisions. Additionally, women’s workload in wheat agriculture is increasing, due to men’s departure to non-agricultural jobs, but women are still not necessarily recognized as capable farmers.

Gender exclusion in agriculture

Given social norms and household-and-farm labor division based on gender, women are often confined to specific roles in the agricultural production system. In smallholder farming communities of South Asia like Bangladesh, India, and Nepal, men’s increasing involvement in non-agricultural activities has increased women’s workloads in every sphere of agricultural production. However, these long-held assumptions of their role can lead to exclusion from decision-making, limiting their control over what, how, and how much a crop is produced, their economic wellbeing, including household food security.

The CIMMYT study on “Intra-household gender dynamics in decision-making for wheat crop management in India (Bihar)” investigates women’s and men’s roles in production decisions. Led by Hom Gartaula, Gender, and Social Inclusion Specialist at CIMMYT, it covers eight villages — four in Darbhanga and four in Madhepura district — with 25 houses considered in each village.

As part of the Accelerating Genetic Gains in Maize and Wheat for improved livelihoods in Asia and Africa (AGG)  project, the research study will help gain deeper insights into the intra-household gender dynamics. It will also help in untangling who does what, how wheat cultivation and management decisions are organized within the households and the perceptions of the male and female farmers around why decisions are made in such a way.

Farmer Devi points at the vignette that aligns with her household decision-making process. (Photo: Nima Chodon /CIMMYT)
Farmer Devi points at the vignette that aligns with her household decision-making process. (Photo: Nima Chodon /CIMMYT)

Storytelling through household decision-making scenarios

In traditional rural societies, survey-based data collection might not be the best way to evaluate women’s agency, as the deeply rooted cultural restrictions might not allow them to talk openly about sensitive issues, like their relationship with a spouse. This study uses an innovative storytelling approach to data collection: using vignettes, farmers are given short stories to relate to their household circumstances. Stories are also easier to remember and help build a connection with the characters quickly.

The vignettes approach was first applied in the context of smallholder maize production in Kenya under the AGG project. According to Rachel Voss, the leader of the Kenyan study, “Using vignettes to explore decision-making in both East Africa and South Asia allows us to learn and compare across these regions and across crops. Gender relations in Indian wheat and Kenyan maize production might look similar in some ways, but very different in other ways, and our research and programming will need to respond to those differences.”

In this study, five vignettes with fictitious husband and wife characters are presented to participants to represent the different ways production and consumption decisions are made in the household. These vignettes describe how they engage in key decisions like seed procurement, labor hired, and harvest used for consumption or sale. With guidance from evaluators, respondents identify which scenario best aligns with the decision-making process in their household.

Researchers feel this qualitative data, gathered through a storytelling approach, could guide the reach of gender interventions in a more effective way. Gartaula and the team explained that the participants can build connections to a character in the story without biases, expressing their experiences in household decision-making through vignettes. They also observed that sometimes what the participant shared is the opposite of their assumption of women being excluded from decisions.

Rethinking gender roles

Traditional gender roles are deeply entrenched in the region. In the farming communities of rural Bihar, one might assume that who does what in wheat-rice cultivation is obvious, and it has been well studied in the past. However, investigating the stereotypes around gender to understand practices within households is an innovative aspect of this study.

For example, landless couple Pappu Paswan and Kamini Devi of village Kamtaul in Darbhanga district have been cultivating wheat on leased farm plots for many years. Devi is engaged in every aspect of decision-making. “We cultivate in leased plots of different sizes, spread across, requiring more effort and time in attending to them. We discuss additional labor during harvest and if there is money enough to pay them,” said Devi pointing her finger at the vignette illustrating ‘cooperation’ in household decision-making. They produce enough for their consumption, but when possible, “I advise my husband to sell some for income,” she added.

Despite contributing to decisions jointly with Pappu when it comes to farm labor and household finances, Devi has little or no knowledge of seed varieties and access. Her husband informs that it was UP262 (wheat seed variety) they have been cultivating for the last two years.

In Rishikesh Ram’s household, land ownership and livelihood specialization were factors in decision-making. He owns the land and makes all farming decisions, including how much will be saved for consumption at home. His wife, Kiran Devi, a nurse at the village primary health center, is hardly involved in any farming work. “As the income from her job contributes to expenses at home, decisions about loans or payment for labors on the farm are joint decisions,” Ram said.

“In these two households of the diverse decision-making process, different approaches to messaging and relevant extension services must be explored to address the issues of exclusion, access, and knowledge gaps in these households,” Gartaula observed.

Bridging the gender gap in agri-food systems

With the feminization of agriculture in the region, women’s contribution to agricultural production is likely to increase. Policy and research interventions must recognize this growing population and support their full economic and social contributions as cultivators, entrepreneurs, and laborers. However, whether women’s growing role in wheat production leads to increased decision-making authority and empowerment is still unknown. But hope is that AGG-supported gender research in South Asia and East Africa will help guide actions on gender and social inclusion in agri-food systems and support cross-learning between the regions.

Wheat improvement: Food security in a changing climate

Written by Sarah Fernandes on . Posted in Publications.

This open-access textbook provides a comprehensive, up-to-date guide for students and practitioners wishing to access the key disciplines and principles of wheat breeding. Edited by Matthew Paul Reynolds, head of Wheat Physiology at CIMMYT, and Hans-Joachim Braun, former Director of CIMMYT’s Global Wheat Program, it covers all aspects of wheat improvement, from utilizing genetic resources to breeding and selection methods, data analysis, biotic and abiotic stress tolerance, yield potential, genomics, quality nutrition and processing, physiological pre-breeding, and seed production.

It will give readers a balanced perspective on proven breeding methods and emerging technologies. The content is rich in didactic material that considers the background to wheat improvement, current mainstream breeding approaches, translational research, and avant-garde technologies that enable breakthroughs in science to impact productivity, facilitating learning.

While the volume provides an overview for professionals interested in wheat, many of the ideas and methods presented are equally relevant to small grain cereals and crop improvement in general.

All chapter authors are world-class researchers and breeders whose expertise spans cutting-edge academic science to impacts in farmers’ fields.

Given the challenges currently faced by academia, industry, and national wheat programs to produce higher crop yields, often with fewer inputs and under increasingly harsher climates, this volume is a timely addition to their toolkit.