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research: Bread wheat breeding

New heat-tolerant wheat varieties prove fruitful for Ethiopia’s irrigated lowlands

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

Ethiopia is the largest wheat producer in Africa, accounting for around 65% of the total wheat production in sub-Saharan Africa. Despite the old tradition of rainfed wheat cultivation in the highlands, irrigated production in the dry, hot lowlands is a recent practice in the country.

In the irrigated lowlands of Afar and Oromia, situated along the Awash River Basin, CIMMYT and the Ethiopian Institute of Agricultural Research (EIAR) have been supporting small scale farming households to improve yields since 2021. The Adaptation, Demonstration and Piloting of Wheat Technologies for Irrigated Lowlands of Ethiopia (ADAPT-Wheat) project supports research centers to identify new technologies suitable for target planting areas through adaptation and development, which are then released to farmers. Funded by Germany’s Federal Ministry for Economic Development (BMZ) and Deutsche Gesellschaft fuer Internationale Zusammenarbeit (GIZ) GMBH, EIAR leads on implementation while CIMMYT provides technical support and coordination.

In the Afar and Oromia regions of Ethiopia, farmers observe wheat trials of the new varieties released in partnership with CIMMYT and EIAR. (Photo: Ayele Badebo)

So far, several bread and durum wheat varieties and agronomic practices have been recommended for target areas through adaptation and demonstration. The seeds of adapted varieties have been multiplied and distributed to small scale farmers in a cluster approach on seed loan basis.

Cross-continent collaboration

The Werer Agricultural Research Center (WRC) run by EIAR has released two wheat varieties: one bread wheat line (EBW192905) and one durum wheat line (423613), both suitable for agroecology between 300-1700 meters above sea level.

Both varieties were selected from the CIMMYT wheat breeding program at its headquarters in Mexico. The new bread wheat variety exceeded the standard checks by 17% (Gaåmabo and Kingbird) and 28% (Mangudo and Werer). 

The lines were trialed through multi-location testing in Afar and Oromia, with both lines displaying tolerance to biotic and abiotic stresses. Accelerated seed multiplication of these varieties is in progress using main and off seasons.

The ADAPT-Wheat project, working in the region since 2021, has released two new varieties for use in the Ethiopian lowlands. (Photo: Ayele Badebo)

“These new varieties will diversify the number of adapted wheat varieties in the lowlands and increase yields under irrigation” said Geremew Awas, a CIMMYT research officer working for the ADAPT project in Ethiopia. Hailu Mengistu, EIAR wheat breeder at WRC, also indicated the need for fast seed delivery of climate resilient wheat varieties on farmers’ hands to realize genetic gain and increase income and food security of the households.

These new varieties will be provided with a local name by breeders to make it easy for farmers and other growers to identify them and will be introduced to farmers through demonstrations and field days. Eligible seed growers who are interested in producing and marketing the basic and certified seeds of these varieties can access early generation seeds from the WRC.

Accord of international center and Spanish cooperative seed supplier will bolster farmers’ access to climate-resilient wheat in the Mediterranean Basin

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

Agrovegetal delegation stands with CIMMYT leaders and researchers. (Photo: CIMMYT)

A new agreement between a leading Spanish seed company, Agrovegetal, and the international research center CIMMYT will help safeguard the regional availability of high-yielding, climate-resilient varieties of wheat, the region’s vital food staple.

The agreement was signed on 21 February 2024 at the Mexico headquarters of CIMMYT, a non-profit organization whose breeding contributions are present in half the maize and wheat varieties sown in low- and middle-income countries.

It comes at a time when severe drought threatens wheat crops in Southern Europe and North African nations such as Algeria, Morocco, and Tunisia and imports of wheat grain from traditional suppliers —Russia, the EU, Ukraine, and the US—are costly and constrained.

Since its formation in 1998 as a conglomerate of seed-producing cooperatives and a few industrial partners, Agrovegetal has been testing hundreds of CIMMYT breeding lines of bread and durum wheat (the latter used for pasta and couscous) and triticale (a wheat x rye hybrid) and returning high-quality data each year on the performance of this germplasm.

“The erratic rainfall, droughts, and crop disease patterns of Andalucía in southern Spain, where Agrovegetal tests the lines, are very much like those of North Africa, an important target region for CIMMYT genetics and agronomic solutions” said Bram Govaerts, director general of CIMMYT. “This new agreement, which guarantees the Agrovegetal-CIMMYT partnership through 2028, thus helps ensure CIMMYT’s capacity to offer outstanding, well adapted lines for the Mediterranean region, including North Africa’s national breeding programs, a great boon to farmers and consumers’ economies, food security, and nutrition.”

For its part, after several years of testing, Agrovegetal registers the most promising CIMMYT lines as improved varieties in Spain and markets their seed to members of its cooperatives.

“For us, the contributions of CIMMYT are invaluable,” said Ignacio Solis Martell, the company’s technical director. “Thanks to CIMMYT’s exceptional genetic material, Agrovegetal has become synonymous with resilience in Andalusia. Our varieties are renowned for their performance in the face of adversity, whether it be disease, drought, or other challenges.”

According to Govaerts, Agrovegetal offers an excellent model for burgeoning private seed enterprises in North Africa and elsewhere. “It shows how farmers, seed producers, and industry can join forces, skills, and resources to control seed, a critical factor in food production.”

Millers in Nigeria laud the release to farmers of co-developed, CIMMYT-derived wheat varieties

Written by Mike Listman on . Posted in Blogs.

Nigerian wheat scientists and millers recently recognized and thanked CIMMYT for its contributions to four new wheat varieties released to farmers, citing the varieties’ exceptional performance in field trials and farmers’ fields across national wheat-growing regions.

“The release of these four wheat varieties, uniquely tailored to suit our local conditions, has marked a significant milestone in enhancing food security and farmer livelihoods,” said Ahamed T. Abdullahi, agronomist for wheat value chains at the Flour Milling Association of Nigeria (FMAN), in a recent message to CIMMYT’s Global Wheat program. “The improved characteristics, such as higher yield potential, enhanced disease resistance, and adaptability to local climatic conditions, have significantly boosted wheat productivity. Moreover, the quality profiles of these varieties, as expressed in Nigeria, comply fully with the standards required by the local industry.”

Two of the varieties are bread wheat and yield up to 7 tons of grain per hectare, according to a recent Nigeria Tribune article. The other two are durum wheat, a species grown to make pasta and foods such as couscous and tabbouleh. One of those, given the name LACRIWHIT 14D in Nigeria, was from a CIMMYT wheat line selected for its novel genetic resistance to leaf rust and high-yield potential under irrigated conditions. It was also released in Mexico under the name CIRNO C2008 and is the country’s number-one durum wheat variety, according to Karim Ammar, a wheat breeder at CIMMYT.

Four new bread and durum wheat varieties based on CIMMYT breeding lines are well adapted to local conditions and offer excellent yields and grain quality. (Photo: FMAN)

“Aside from its high yield potential, it has considerable grain size and an aggressive grain fill that is expressed even under extreme heat,” explained Ammar. “These characteristics have certainly helped its identification as outstanding for Nigerian conditions.”

Writing on behalf of FMAN and the Lake Chad Research Institute (LCRI) of Nigeria’s Federal Ministry of Agriculture and Rural Development, Abdullahi said, “We deeply appreciate the expertise and support provided by CIMMYT throughout the development and release process. Your team’s technical guidance on the access to germplasm has played a crucial role in equipping our farmers and extension agents with the necessary skills and resources for successful wheat cultivation.”

Nigeria has a fast-growing population which, coupled with increasing per capita demand for wheat, has made increasing wheat production a national priority, according to Kevin Pixley, director of the Dryland Crops and Global Wheat programs at CIMMYT.

“Until recently, Nigeria produced only 2% of the wheat it consumes, but potential exists to double the current average yield and expand wheat production by perhaps 10-times its current area,” said Pixley. “New wheat varieties will be essential and must be grown using sustainable production practices that improve farmers’ livelihoods while safeguarding long-term food security and natural resources.”

Abdullahi said the release of the varieties demonstrated the power of collaborative research and highlighted the potential for future collaborations. “We look forward to continued collaborations and success in the pursuit of sustainable food systems.”

CIMMYT researcher receives Heroes Award

Written by Julian Bañuelos-Uribe on . Posted in Press releases.

Maria Itria Ibba, a scientist at CIMMYT, received the inaugural Heroes Award from the Foundation for Innovation in Healthy Food. She received the award on October 29 at the ASA-CSSA-SSSA International Annual Meeting in St. Louis, Missouri, U.S.

Ibba, head of CIMMYT’s Wheat Chemistry and Quality Laboratory, received the honor in recognition of her outstanding leadership in launching the foundation’s Coalition for Grain Fiber initiative.

Together with her team at CIMMYT, Ibba works on improving the processing and nutritional quality of the bread and durum wheat lines derived from the CIMMYT spring wheat breeding programs. The research they conduct combines genetics and cereal chemistry, and one of the main focuses is to improve wheat grain dietary fiber. This effort begins with the development of efficient screening methods and the identification of germplasm with unique dietary fiber profiles.

The coalition seeks to improve the nutrition in staple foods without impacting their taste, mouthfeel or consumer price. It is simultaneously dedicated to establishing profit incentives for farmers and other food suppliers that enhance public health by delivering increased nutrient foods.

According to the coalition, improvements in the nutritional content of white and whole wheat flour may ultimately save thousands of lives and billions of healthcare U.S. dollars globally.

“Most people across the world do not consume enough dietary fiber, which is essential in the fight against various diseases,” says Ibba. “Increasing the dietary fiber content of a staple crop like wheat could have a significant positive impact on the health of wheat consumers. Our goal is to increase dietary fiber intake through the consumption of wheat products with greater fiber content.”

Maria Itria Ibba. (Photo: CIMMYT)

Plant breeders, food scientists, nutrition/health scientists and economists are partnering with the coalition to transform the food industry. They support non-GMO (not genetically modified organisms) approaches to increasing naturally occurring dietary fiber in grains.

Over 50 public and private-sector laboratory leaders in three countries and 23 U.S. states have engaged with the coalition, including from CIMMYT, Rothamsted Research, University of Nebraska, Lincoln, University of California, Davis, Cornell University and Bayer Crop Science.

The Nebraska Wheat Board provided support for the efforts of the foundation and the coalition.

“I feel humbled to have received the Heroes Award,” says Ibba. “I know that this award not only represents the work I have been doing, but also all the hard work that my team and my organization have been doing for several years.”

About CIMMYT

CIMMYT is a cutting edge, non-profit, international organization dedicated to solving tomorrow’s problems today. It is entrusted with fostering improved quantity, quality, and dependability of production systems and basic cereals such as maize, wheat, triticale, sorghum, millets, and associated crops through applied agricultural science, particularly in the Global South, through building strong partnerships. This combination enhances the livelihood trajectories and resilience of millions of resource-poor farmers, while working towards a more productive, inclusive, and resilient agrifood system within planetary boundaries.

CIMMYT is a core CGIAR Research Center, a global research partnership for a food-secure future, dedicated to reducing poverty, enhancing food and nutrition security and improving natural resources. For more information, visit cimmyt.org.

About the Foundation for Innovation in Healthy Food

FIHF builds coalitions of stakeholders that support increasing the nutritional value of the foods we consume, while preserving consumers’ food experiences.

About the Coalition for Grain Fiber

The coalition is enrolling grain fiber in the fight against chronic disease. By improving the nutritional content of white and whole wheat flour, it seeks to save thousands of lives and dramatically reduce healthcare costs.

Country moving forward from wheat importer to self-sufficiency

Written by mcallejas on . Posted in Features.

Wheat is critical to millions of households in Pakistan as it serves a dual role as a foundational part of nutritional security and as an important part of the country’s economy. Pakistan’s goal to achieve self-sufficiency in wheat production is more attainable with the release of 31 wheat varieties since 2021.

These new seeds will help the country’s 9 million hectares of cultivated wheat fields become more productive, climate resilient, and disease resistant—a welcome development in a region where climate change scenarios threaten sustained wheat production.

The varieties, a selection of 30 bread wheat and 1 durum wheat, 26 of which developed from wheat germplasm provided by the International Maize and Wheat Improvement Center (CIMMYT) were selected after rigorous testing of international nurseries and field trials by partners across Pakistan. During this period, three bread wheat varieties were also developed from local breeding programs and two varieties (one each of durum and bread wheat) were also developed from the germplasm provided by the ICARDA. These efforts are moving Pakistan closer to its goal of improving food and nutrition security through wheat production, as outlined in the Pakistan Vision 2025 and Vision for Agriculture 2030.

Harvesting wheat in Tandojam, Pakistan (Photo: CIMMYT)

Over multiple years and locations, the new varieties have exhibited a yield potential of 5-20% higher than current popular varieties for their respective regions and also feature excellent grain quality and attainable yields of over seven tons per hectare.

The new crop of varieties exhibit impressive resistance to leaf and yellow rusts, compatibility with wheat-rice and wheat-cotton farming systems, and resilience to stressors such as drought and heat.

Battling malnutrition

Malnutrition is rampant in Pakistan and the release of biofortified wheat varieties with higher zinc content will help mitigate its deleterious effects, especially among children and women. Akbar-2019, a biofortified variety released in 2019, is now cultivated on nearly 3.25 million hectares. Farmers like Akbar-2019 because of its 8-10% higher yields, rust resistance, and consumers report its good chapati (an unleavened flatbread) quality.

“It is gratifying seeing these new varieties resulting from collaborative projects between Pakistani wheat breeding programs and CIMMYT along with funding support from various donors (USAID, Bill & Melinda Gates Foundation, HarvestPlus, and FCDO) and the government of Pakistan,” said Ravi Singh, wheat expert and senior advisor.

Closing the yield gap between research fields and smallholder fields

Releasing a new variety is only the first step in changing the course of Pakistan’s wheat crop. The next step is delivering these new, quality seeds to markets quickly so farmers can realize the benefits as soon as possible.

Increasing evidence suggests the public sector cannot disseminate enough seeds alone; new policies must create an attractive environment for private sector partners and entrepreneurs.

Field monitoring wheat fields (Photo: CIMMYT)

“Pakistan has developed a fast-track seed multiplication program which engages both public and private sectors so the new varieties can be provided to seed companies for multiplication and provided to farmers in the shortest time,” said Javed Ahmad, Wheat Research Institute chief scientist.

Strengthening and diversifying seed production of newly released varieties can be done by decentralizing seed marketing and distribution systems and engaging both public and private sector actors. Marketing and training efforts need to be improved for women, who are mostly responsible for household level seed production and seed care.

A concerted effort to disseminate the improved seed is required, along with implementing conservation agriculture based sustainable intensification, to help Pakistan’s journey to self-sufficiency in wheat production.

Young CIMMYT scientist receives 2022 Japan Award for global research to combat wheat aphids

Written by Mike Listman on . Posted in News.

“To meet expected wheat demand for 2050, production will need to double, which means increasing harvests nearly 70 kilograms per hectare each year,” said Leonardo Crespo-Herrera, CIMMYT wheat scientist and 2022 Japan Award recipient. “Breeding will be a major contributor, but better agronomic practices and policies will also be critical.” (Photo: CIMMYT)

International science to save wheat — a crucial food grain for 2.5 billion of the world’s poor — from a rising tide of insect pests known as aphids was lauded on November 22 with the 2022 Japan International Award for Young Agricultural Researchers (the Japan Award).

The 2022 Japan Award recognized novel breeding approaches to identify and select for genetic resistance in wheat to two species of aphids that cause wheat grain losses reaching 20% and whose rapid spread is propelled by rising temperatures.

Aphid resistant wheat can contribute to more sustainable food production, protecting farmers’ harvests and profits, while reducing the need to use costly and harmful insecticides, said Leonardo Crespo-Herrera, bread wheat improvement specialist for the International Maize and Wheat Improvement Center (CIMMYT) and one of the three 2022 Japan Award recipients.

“In addition to genetic yield potential, CIMMYT wheat breeding focuses on yield stability, disease resistance, and nutritional and end-use quality,” Crespo-Herrera explained. “Adding another target trait — aphid resistance — makes wheat breeding much more challenging.”

Efficient and effective field testing to confirm the genetics

Crespo-Herrera and his CIMMYT colleagues managed to identify and characterize genome segments responsible for aphid resistance in wheat and its near relatives, as well as running innovative field tests for a set of elite wheat breeding lines that were predicted to carry that resistance.

“With the aphid species called the greenbug, its feeding causes yellowing and necrotic spots on wheat, so we could actually measure and score wheat plants in plots that we deliberately infested with the aphids, keeping the resistant lines and throwing out the susceptible ones,” said Crespo-Herrera.

For the other species, the bird cherry-oat aphid, the only visible feeding damage is when the plants become stunted and die, so Crespo-Herrera and colleagues instead measured biomass loss and reduced growth in 1,000 artificially infested wheat lines, identifying a number of lines that had low scores for those measurements. Given that the lines tested came from a set that had already shown resistance to the greenbug, some of the successful lines feature resistance to both aphid species.

For the bird cherry-oat aphid, in two years of additional field tests, Crespo-Herrera and his team found that aphid populations were lower in plots sown with resistant wheat lines. “The experiments included remote sensing measurements that identified certain spectral signatures correlated with aphid populations; this may help us to assess resistance in future field trials.”

The researchers also found that a cutting-edge approach known as “genomic prediction” provided good estimations regarding promising, aphid-resistant wheat breeding lines.

Motivating young researchers in research and development

Established in 2007, the Japan Award is an annual prize organized by the Agriculture, Forestry and Fisheries Research Council (AFFRC) of Japan’s Ministry of Agriculture, Forestry and Fisheries (MAFF) and supported by the Japan International Research Center for Agricultural Sciences (JIRCAS). Awardees receive a $5,000 cash prize.

In an excerpt of an official note regarding Crespo-Herrera’s research, those agencies said  “
This study has been highly evaluated for developing (wheat) lines that have been distributed worldwide for use in wheat breeding, and the methods of this study have been applied to develop varieties with resistance mechanisms against various kinds of insects, not only aphids.”

Crespo-Herrera thanked JIRCAS and MAFF for the award. “I feel honored to have been selected.”

Drought and heat tolerance in bread wheat landraces

Written by Sarah McLaughlin on . Posted in Publications.

Climate change is predicted to cause losses of more than 20% in agricultural production by 2050. With a growing global population, crops adapted to the effects of climate change, such as drought and heat, are necessary for the maintenance of productivity levels to meet the demand for food.

Scientists from the International Maize and Wheat Improvement Center (CIMMYT), in collaboration with scientists from the Universidad AutĂłnoma Agraria Antonio Narro, set out to analyze bread wheat landrace traits against seven climactic variables: mean temperature, maximum temperature, precipitation, precipitation seasonality, heat index of mean temperature, heat index of maximum temperature, and drought index. The method used genome-environment associations (GEA) and environmental genome-wide association scans (EnvGWAS), which have traditionally been poorly applied in this type of research.

Based on a sample of 990 bread wheat landraces from the CIMMYT genebank, the study discovered proteins associated with tolerance to drought and heat. With these results, new genotypes with resistant alleles can be selected for breeding programs to produce resistant varieties adapted to extreme environments and the effects of climate change.

Read the study: Worldwide Selection Footprints for Drought and Heat in Bread Wheat (Triticum aestivum L.)

This work was implemented by CIMMYT as part of the Seeds of Discovery (SeeD) Initiative in collaboration with Universidad AutĂłnoma Agraria Antonio Narro (UAAAN), made possible by the generous support of the MasAgro project funded by the Government of Mexico’s Secretariat of Agriculture and Rural Development (SADER). Any opinions, findings, conclusion, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of SADER.

Cover photo: Field hand collecting wheat in Ciudad Obregon, Mexico. (Photo: Peter Lowe/CIMMYT)

Developing climate change resistant wheat

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

The International Maize and Wheat Improvement Center (CIMMYT) are at the forefront of dealing with the impact of climate change by developing wheat varieties with tolerance to heat and drought.

Wheat constitutes as much as 60% of daily calorie intake in developing countries. However, rising temperatures caused by climate change is reducing farmers’ yields.

Matthew Reynolds, Wheat Physiologist, and Maria Itria Ibba, Cereal Chemist, share how their work contributes towards securing food security and nutrition by breeding new wheat varieties.

Read the original article: Develoing climate change-resistant wheat

The future of wheat

Written by Alfonso Cortés on . Posted in Videos.

CIMMYT’s experimental station in Obregón, a small city in Mexico’s state of Sonora, is considered a mecca for wheat research and breeding. In 1945, Norman Borlaug arrived as a geneticist for a special project between the Mexican government and the Rockefeller Foundation, to help local farmers with wheat production. After a few years, his strong bond with the community, students and interns was key to making a remarkable difference on wheat research that save millions from famine and won him the Nobel Peace Prize. A legacy that has lasted for many decades.

At Obregón, scientists have access to state-of-the-art field facilities and an ideal location, in the northern Yaqui Valley. The station’s dry climate and favorable temperature in winter is suitable to assess yield potential, while its hot summers are ideal to study wheat’s tolerance to different stressors.

Here, scientists and field workers work hard all year round to ensure the future of wheat. Varieties grown in all continents have CIMMYT and Sonoran DNA.

SPECIAL THANKS TO: Jeanie Borlaug Laube. JesĂșs Larraguibel Artola, President of PIEAES (Patronato para la InvestigaciĂłn y ExperimentaciĂłn AgrĂ­cola del Estado de Sonora A.C.). AsociaciĂłn de Organismos de Agricultores del Sur de Sonora A.C. (AOASS) Global Wheat Program, CIMMYT: Alison Bentley (Program Director), Karim Ammar, Rodrigo RascĂłn, Carolina Rivera, Alberto Mendoza, Leonardo Crespo and Nele Verhulst.

CREDITS: Production: Alfonso Cortés, Marta Millere and Silvia Rico, CIMMYT. Additional drone shots: Courtesy of INIFAP and PIEAES. Post-production: Silvia Rico, CIMMYT

MUSIC: The Way Up created by Evert Z. Licensed from Artlist.io (License owner: CIMMYT. Creator Pro License Number – 159864). Eclipse created by EFGR. Licensed from Artlist.io (License owner: CIMMYT. Creator Pro License Number – 159864).

Winner of BGRI Gene Stewardship Award announced

Written by Sarah McLaughlin on . Posted in News.

This year’s Borlaug Global Rust Initiative (BGRI) Gene Stewardship Award recipients have been recognized for their innovative research tackling the global problem of wheat leaf rust.Led by Julio Huerta from the Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP), members of the award-winning team include:

  • HĂ©ctor Eduardo Villaseñor Mir (cereal breeder)
  • RenĂ© Hortelano Santa Rosa (cereal breeder)
  • Eliel MartĂ­nez Cruz, (cereal chemist)
  • MarĂ­a Florencia RodrĂ­guez GarcĂ­a (cereal pathologist)
  • Ernesto SolĂ­s Moya (wheat breeder)
  • Jorge IvĂĄn Alvarado Padilla (wheat breeder)

The award recognizes the team’s long-term contribution to Mexican wheat cultivation and their efforts to expand impacts worldwide. They have released many varieties with resistance to leaf rust, which has led to the stabilization of the disease in bread wheat.

Presented annually, the award is bestowed upon a team of researchers serving a national breeding program or other nationally based institution. Winners receive an inscribed bronze statue of Norman Borlaug.

Huerta has been hosted by the International Maize and Wheat Improvement Center (CIMMYT) in Mexico since the late 1990s.

Julio Huerta, wheat pathologist and recipient of the BGRI Gene Stewardship Award 2022, giving a talk to students introducing CIMMYT’s wheat breeding program. (Credit: CIMMYT)

BGRI Technical Workshop

Receiving the prize at the 2022 BGRI Technical Workshop on September 9, Huerta said, “The award means a recognition from the global rust scientific community for the hard work (flesh, mind, soul and spirit) over the years, carried with many colleagues around the world to keep rust disease under control.”

Alison Bentley, director of the Global Wheat Program, also participated in the event with a presentation on the connection between conflict and vulnerability in global food systems. She explored reasons why wheat has been dramatically impacted by the conflict in Ukraine and summarized the proposed response agenda by CIMMYT.

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)

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.