Around 10 years ago, CIMMYT began work on developing wheat with higher zinc and iron, under an initiative called HarvestPlus. CIMMYT has released eleven varieties of zinc wheat in India, which are also high-yielding and disease-resistant. Read more here.
Anne Wambui has been growing maize in her farm located in the upper eastern Kenyan county of Embu for three decades to cater for domestic consumption and sale in the nearby market.
During this period, she has relied on buying varieties from seed stockists that are either recommended by the agricultural extension officials or not necessarily varieties that she prefers to plant.
However, scientists at the International Maize and Wheat Improvement Center (CIMMYT) emphasized that farmers should be availed varieties that meet their varied needs.
In the early 20th century, Aaron Aaronsohn, a prominent agronomist best known for identifying the progenitor of wheat, began looking for durum wheat landraces in Israel. He traveled to villages across the country, carefully collecting and recording details of the local varieties used in each area.
This task was not without purpose. Aaronsohn recognized that as increasing numbers of settlers like himself came to the territory, the varietal change from the introduction of new and competitive wheat varieties and the rapid intensification of agriculture would soon cause all the traditional structures he had identified to disappear.
Aaronsohn was one of the first to begin collecting germplasm in the region, but others saw the importance of collecting before large-scale change occurred. For example, Russian botanist Nikolai Vavilov gathered samples from Israel on one of his expeditions through the Middle East. By the end of the century, a number of collections had been established, but overall efforts at conservation were fragmented.
âThatâs why we say the collection was on the verge of extinction,â explains Roi Ben-David, a researcher at the Volcani Center, Israelâs Agricultural Research Institute (ARO). âThere were single accessions in genebanks around the world but no one really gave them special treatment or saw their value. Many were in private collections; others were simply lost.â
When Ben-David and his colleagues began looking for landraces six years ago, even the collection housed at the Israeli Genebank (IGB) was disappointing, with many samples stored in unmarked boxes in sub-optimal conditions. âWhen we came in nobody was really trying to study what we had and put it together to represent the areaâs wheat landscape as it was 100 years ago.â
Long-term efforts to restore and conserve a collection of Israeli and Palestinian wheat landraces (IPLR) have led to the restoration of 930 lines so far, but there are many varieties that cannot be recovered. Therefore, it came as a great surprise to Ben-David when he arrived at the International Maize and Wheat Improvement Center (CIMMYT) headquarters in Mexico and stumbled upon one of the collections presumed lost. âI think it was actually my first week at CIMMYT when I spotted a demonstration plot growing one of the lost varieties â a subset of the Ephrat-Blum collection â and I couldnât believe it.â
He had heard about this collection from the late Abraham Blum, but had never been able to locate it. âSomeone might have moved the seeds, or maybe the box was not well labelled and thrown out. We donât know, but needless to say it was a very good surprise to rediscover 64 of our missing lines.â
What prompted you and your colleagues to start looking for landraces in Israel?
We began because we recognized local landraces are good genetic resources but unfortunately, we couldnât find any. It wasnât so much that they didnât exist, but the accessions were scattered across the world, mostly in private collections in countries like the USA or Australia. The Israeli Genebank, which sits only two floors above my office, had a few buckets of germplasm but nobody really knew what was inside.
The Middle East and the Fertile Crescent are centers of diversity, not only for wheat but for all crops that were part of the Neolithic revolution 10,000 years ago. They started here â the exact point of origin was probably in what is now southeast Turkey â so we have had thousands of years of evolution in which those landraces dominated the agricultural landscape and adapted to different environments.
Why do you think so much of the collection was lost?
The lines from Israel were lost because their conservation simply wasnât prioritized. Losses happen everywhere but what was missing in this case was the urgency and understanding of just how important these collections are. Luckily, the current manager of the IGB, who is a fundamental partner in building the IPLR, understood the need to prioritize this and allocated a budget to conserve it as one collection.
What is the value of conserving landraces and why should it be prioritized?
Landraces are an extremely important genetic resource. Wild relatives are the biggest treasure, but breeders are usually reluctant to use them because they are so very different from modern varieties. So landraces form the link between these two, having already been domesticated and developed within farming systems while remaining genetically distinct from the modern. In wheat, theyâre quite easy to spot because of how tall they are compared to the semi-dwarf varieties that replaced them in the 20th century.
There are two main reasons why we need to prioritize conservation. First, we believe that the evolution under domestication in this region is important to the community as a whole. Second, it is now a critical time, as weâre getting further from the time in which those traditional lines were in use. The last collection was carried out in the 1980s, when people were still able to collect authentic landraces from farmers but this is just not possible any more. We travelled all over the country but the samples we collected were not authentic â most were modern varieties that farmers thought were traditional. Not everybody knows exactly what theyâre growing.
The time factor is critical. If we were to wake up 50 years from now and decide that itâs important to start looking for landraces, I donât know how much we could actually save.
Are there any farmers still growing landraces in Israel?
When we started looking for farmers who are still growing landraces we only found one farm. It is quite small â only about ten acres shared between two brothers. They grow a variety which is typically used to make a traditional food called kube, a kind of meat ball covered in flour and then then either fried or boiled. If you boil it using regular flour it falls apart, so people prefer to use a landrace variety, which is what the brothers grow and are able to sell for up to six times as much as regular durum wheat in the market. However, theyâre not really interested in getting rich; theyâre just trying to keep their traditions alive.
How are you and your colleagues working to conserve the existing collection?
There are two approaches. We want to develop is ex-situ conservations to preserve the diversity. As landraces are not always easy to conserve in a genebank, we also want to support in-situ conservation in the field, like traditional farmers have done. Together with the IGB weâve distributed seed to botanical gardens and other actors in the hope that at least some of them will propagate it in their fields.
Having established the collection, weâre also trying to utilize it for research and breeding as much as possible. So far weâve characterized it genetically, tested for drought tolerance and other agronomic traits and weâre in talks to start testing the quality profile of the lines.
Did you continue working on this while you were based at CIMMYT?
Yes, this was an additional project I brought with me during my sabbatical. The main success was working with Carolina Sansaloni and the team at the Genetic Resources program to carry out the genotyping. If it were left to my own resources, I donât think we could have done it as the collection contains 930 plant genotypes and we only had the budget to do 90.
Luckily, CIMMYT also has an interest in the material so we could collaborate. We brought the material, CIMMYT provided technical support and we were able to genotype it all, which is a huge boost for the project. We had already been measuring phenotypes in Israel, but now that we have all the genetic data as well we can study the collection more deeply and start looking for specific genes of interest.
What will happen to the lines you discovered at CIMMYT?
Theyâve been sent back to Israel to be reintegrated into the collection. I want to continue collaborating with people in CIMMYTâs Genetic Resources program and genebank to do some comparative genomics and assess how much diversity we have in the IPLR collection compared with what CIMMYT has. Is there any additional genetic diversity? How does it compare to other landraces collections? That is what we want to find out next.
Roi Ben-David is based at Israelâs Agricultural Research Organization (ARO). He works in the Plant Institute, where his lab focuses on breeding winter cereals such as wheat. He has recently completed a one-year sabbatical placement at the International Maize and Wheat Improvement Center (CIMMYT).
CIMMYTâs germplasm banks contain the largest and most diverse collections of maize and wheat in the world. Improved and conserved seed is available to any research institution worldwide.
How to track adoption and assess the impact of maize and wheat varieties? Some of the methods used until now, like farmersâ recall surveys, have various limitations. In addition to relying exclusively on peopleâs memory and subjectivity, they are difficult to replicate and prone to errors.
DNA fingerprinting, on the other hand, allows objective evaluation and is considered the âgold standardâ method for adoption and impact assessments.
It consists of a chemical test that shows the genetic makeup of living things, by separating strands of DNA and revealing the unique parts of their genome. The results show up as a pattern of stripes that can be matched against other samples.
This technique is extremely helpful in tracking crop varieties and monitoring their adoption. It can be used to assess the impact of research-for-development investments, guide breeding and seed system strategies, implement the intellectual property rights of breeders, assess the use of crop genetic resources, and informing policy.
On June 25, 2019, the International Maize and Wheat Improvement Center (CIMMYT) held a half-day workshop in Addis Ababa to discuss the use and application of DNA fingerprinting in Ethiopia for the tracking of crop varieties.
High-level government officials and major players in the agricultural sector were interested in learning more about the policy implications of this tool and how to mainstream its use.
CIMMYTâs Socioeconomics Program Director, Olaf Erenstein (left), talks to Eyasu Abraha, Minister of Agriculture and Natural Resources (center), and Mandefro Nigussie, Director General of the Ethiopian Institute of Agricultural Research.
Introducing DNA fingerprinting in Ethiopia
The main DNA fingerprinting project in Ethiopia has been in operation since January 2016, focusing on the countryâs two major staple crops: wheat and maize. The project covers the Amhara, Oromia, SNNPR, and Tigray regions, which together account for 92% and 79% of the national wheat and maize production.
The Bill & Melinda Gates Foundation has funded the project, which was jointly implemented by CIMMYT, the Ethiopian Institute of Agricultural Research (EIAR), Ethiopiaâs Central Statistical Agency (CSA) and Diversity Arrays Technology (DArT).
The main objective of the project was to generate a knowledge base for the practical use of DNA fingerprinting, to mainstream the use of this technology, and to offer policy options and recommendations.
CIMMYT scientists Dave Hodson (left), Bekele Abeyo (center) and Sarah Hearne participated in the workshop.
Better monitoring for wheat self-sufficiency
At the workshop, researchers presented two policy briefs specific to Ethiopia: one focusing on policy implications of DNA fingerprinting for tracking bread wheat varieties and another one on how to revitalize the durum wheat sub-sector.
Speaking at the workshop, Eyasu Abraha, Minister of Agriculture and Natural Resources, noted that the government planned to achieve wheat grain self-sufficiency in the next few years by increasing wheat productivity in the highlands and expanding wheat production to the lowlands through irrigation. In this regard, improved crop variety development and dissemination is one of the key elements to increase agricultural productivity and improve the livelihood of millions of smallholder farmers.
According to Abraha, more than 130 wheat varieties have been released or registered in Ethiopia since the late 1960s, in collaboration with international research organizations. Public and private seed enterprises have multiplied and distributed these varieties to reach smallholder farmers.
Even though adoption studies have been conducted, there is still a strong need for more accurate and wider studies. In addition to tracking adoption and demand, using DNA fingerprinting could help understand the distribution of varieties across space and time.
Members of the International Maize Improvement Consortium Africa (IMIC – Africa) and other maize and wheat research partners discovered the latest innovations in seed and agronomy at Embu and Naivasha research stations in Kenya on August 27 and 28, 2019. The International Maize and Wheat Improvement Center (CIMMYT) and the Kenya Agriculture & Livestock Research Organization (KALRO) held their annual partner field days to present sustainable solutions for farmers to cope with poor soils, a changing climate and emerging diseases and pests, such as wheat rust, maize lethal necrosis or fall armyworm.
Versatile seeds and conservation agriculture offer farmers yield stability
âMaize is food in Kenya. Wheat is also gaining importance for our countries in eastern Africa,â KALRO Embu Center Director, Patrick Gicheru, remarked. âWe have been collaborating for many years with CIMMYT on maize and wheat research to develop and disseminate improved technologies that help our farmers cope against many challenges,â he said.
Farmers in Embu, like in most parts of Kenya, faced a month delay in the onset of rains last planting season. Such climate variability presents a challenge for farmers in choosing the right maize varieties. During the field days, CIMMYT and KALRO maize breeders presented high-yielding maize germplasm adapted to diverse agro-ecological conditions, ranging from early to late maturity and from lowlands to highlands.
JoĂŁo Saraiva, from the Angolan seed company Jardins dâAyoba, said having access to the most recent improved maize germplasm is helpful for his young seed company to develop quality seeds adapted to farmersâ needs. He is looking for solutions against fall armyworm, as the invasive species is thriving in the Angolan tropical environment. He was interested to hear about CIMMYTâs progress to identify promising maize lines resistant to the caterpillar. Since fall armyworm was first observed in Africa in 2016, CIMMYT has screened almost 1,200 inbred lines and 2,900 hybrids for tolerance to fall armyworm.
âHopefully, we will be developing and releasing the first fall armyworm-tolerant hybrids by the first quarter of 2020,â announced B.M. Prasanna, director of CIMMYTâs Global Maize Programme and the CGIAR Research Program on Maize (MAIZE).
âThrough continuous innovations to build varieties that perform well despite dry spells, heat waves or disease outbreak, maize scientists have been able to deliver significant yield increases each year across various environments,â explained Prasanna. âThis genetic gain race is important to respond to growing grain demands despite growing climate risks and declining soil health.â
Berhanu Tadesse, maize breeder at the Ethiopian Institute for Agricultural Research (EIAR), was highly impressed by the disease-free, impeccable green maize plants at Embu station, remembering the spotted and crippled foliage during a visit more than a decade ago. This was âvisual proof of constant progress,â he said.
For best results, smallholder farmers should use good agronomic practices to conserve water and soil health. KALRO agronomist Alfred Micheni demonstrated different tillage techniques during the field tour including the furrow ridge, which is adapted to semi-arid environments because it retains soil moisture.
A vibrant local seed industry is needed for farmers to access improved varieties. Seed growers must be able to produce pure, high-quality seeds at competitive costs so they can flourish in business and reach many smallholder farmers.
Double haploid technology enables breeders to cut selection cycles from six to two, ultimately reducing costs by one third while ensuring a higher level of purity. Sixty percent of CIMMYT maize lines are now developed using double haploid technology, an approach also available to partners such as the Kenyan seed company Western Seeds.
The Seed Production Technology for Africa (SPTA) project, a collaboration between CIMMYT, KALRO, Corteva Agriscience and the Agricultural Research Council, is another innovation for seed companies enabling cheaper and higher quality maize hybrid production. Maize plants have both female and male pollen-producing flowers called tassels. To produce maize hybrids, breeders cross two distinct female and male parents. Seed growers usually break the tassels of female lines manually to avoid self-pollination. SPTA tested a male sterility gene in Kenya and South Africa, so that female parents did not produce pollen, avoiding a detasseling operation that damages the plant. It also saves labor and boosts seed yields. Initial trial data showed a 5 to 15% yield increase, improving the seed purity as well.
World-class research facilities to fight new and rapidly evolving diseases
The KALRO Naivasha research station has hosted the maize lethal necrosis (MLN) quarantine and screening facility since 2013. Implementing rigorous phytosanitary protocols in this confined site enables researchers to study the viral disease first observed in Africa 2011 in Bomet country, Kenya. Working with national research and plant health organizations across the region and the private sector, MLN has since been contained.
A birdâs eye view of the demonstration plots is the best testimony of the impact of MLN research. Green patches of MLN-resistant maize alternate with yellow, shrivelled plots. Commercial varieties are susceptible to the disease that can totally wipe out the crop, while new MLN-resistant hybrids yield five to six tons per hectare. Since the MLN outbreak in 2011, CIMMYT has released 19 MLN-tolerant hybrids with drought-tolerance and high-yielding traits as well.
Maize Lethal Necrosis (MLN) sensitive and resistant hybrid demo plots in Naivasha’s quarantine & screening facility (Photo: KIPENZ/CIMMYT)
A major challenge to achieving food security is to accelerate the varietal replacement on the market. CIMMYT scientists and partners have identified the lengthy and costly seed certification process as a major hurdle, especially in Kenya. The Principal Secretary of the State Department for Research in the Ministry of Agriculture, Livestock, and Fisheries, Hamadi Boga, pledged to take up this issue with the Kenya Plant and Health Inspectorate Service (KEPHIS).
âSuch rapid impact is remarkable, but we cannot rest. We need more seed companies to pick up these new improved seeds, so that our research reaches the maximum number of smallholders,ââ concluded Prasanna.
Training attendees outside the Rift Valley Hotel in Adama, Ethiopia. (Photo: CIMMYT)
From July 22â26, the Stress Tolerant Maize for Africa (STMA) project organized a training in Adama, Ethiopia to update maize technicians on recent developments in maize research, data collection and seed production. The training was designed to stimulate good breeding programs, good data collection in trial and nurseries, production of better quality seed and development of improved varieties. Around 25 trainees attended, mainly from maize breeding research centers. Similar trainings were conducted in all STMA project countries over the last three and a half years.
CIMMYT staff from Ethiopia, Kenya and Zimbabwe and staff from the Ethiopian Institute of Agricultural Research (EIAR) Bako Research Center delivered training on methodologies and gave practical demonstrations on tablets. Presentations focused on the origin and botany of the maize plant, constraints to maize production in Ethiopia, data collection, breeding for abiotic stresses, new tools for phenotyping, maize lethal necrosis (MLN), and seed quality control.
Mandefro Nigussie, Director General of EIAR, said that the training was important because it addressed data collection. âIf we are missing the data, we are missing the investment of the country,â he noted. He recognized CIMMYTâs culture in empowering research centers through trainings. The role of EIAR is to generate, test, disseminate and scale technologies. Therefore, having technicians who are aware of the recent developments in their areas is crucial.
Cosmos Magorokosho, maize breeder and STMA project leader, said that the core components of the training were to give technicians a strong understanding of the basics of maize and the physiology of maize plant. The knowledge they gained from this training will support them during data collection and when breeding for resistance to diseases and pests and improved seed production.
Upon completing five days training, all trainees received certificates along with the presentations and other relevant documents for future reference. CIMMYT maize breeder Dagne Wegary said he appreciated the active participation and dedication of the trainees and the interest they showed to improve their knowledge and skills. He reminded them that this is the start of a long journey and they will have to use the knowledge and skills gained to help farmers produce more and ensure food security. Trainees reflected that the training increased their existing knowledge in maize breeding and helped them to understand the current developments in the area. They said they would directly apply what they have learned and transfer the knowledge to other colleagues working in maize breeding.
This year opens the Decade of Family Farming (#FamilyFarmingDecade), which aims to improve the life of family farmers around the world. In an earnest discussion, two leaders in the global agriculture community reflect on the challenges facing family farmers, the promises of high- and low-tech solutions, and their hopes for the future.
A conversation between Martin Kropff, Director General of the International Maize and Wheat Improvement Centre (CIMMYT) and Trevor Nicholls, CEO of CABI.
On the unique challenges facing family farms
Trevor Nicholls (CABI): Family farmers come in many shapes and sizes but for me, the words âfamily farmerâ bring a focus on smallholders and people who are starting on a journey of making a farming business. It depends on which part of the world youâre talking about; a family farm in the UK is perhaps very different to a small family farm in Ethiopia. And family farms can grow from just a small plot to being quite large commercial enterprises.
Martin Kropff (CIMMYT): All agriculture started with family farms. Fifty years ago in my home country, the Netherlands, farms were almost all family farms. When we look globally, farms in places like India, Pakistan, and Kenya are very often small, and the whole family is involved.
KROPFF: When the whole family is involved, gender dynamics come out. In a way, family farming is very often the farming done by women. This makes women the most important players in agriculture in many developing countries. Itâs crucial to recognize this and understand their decision-making. For example, our research shows that men and women value different traits in crop varieties. We need to understand this to have successful interventions.
NICHOLLS: Weâve seen something similar through our Plantwise plant clinics, where farmers come for practical plant health advice. We see a definite pattern of men bringing in cash crops for advice, and women looking more at fruits and vegetables to feed their family. But overall, mostly men come into our clinics, particularly in certain parts of the world. Weâre trying to encourage more female participation by timing the clinics so that they fit into womenâs routines without getting in the way of taking care of elderly relatives or getting kids off to school. Sometimes really simple things can open up access and improve the gender balance.
KROPFF: When the whole family is involved, there are also downsides. In Africa, young people do much of the weeding.
NICHOLLS: Thatâs right, they may be pulled out of school for weeding.
KROPFF: This really worries me. Hand weeding is such hard labor, such an intensive use of energy; it seems like it should be something of the past. Children donât want to do it anymore. My wife is from the generation where children still did weeding in the Netherlands. She remembers standing in the fields weeding when the sun was extremely warm while her friends were out doing other things.
NICHOLLS: It starts kids off on the wrong path, doesnât it? If their experience of farming is backbreaking weeding from the age of 8 onwards, itâs highly unlikely to attract them into farming as a career.
A farmer uses a smartphone to access market information.
On keeping young people interested in farming
NICHOLLS: We need to look at things like weed control as a social issue. Itâs possible, for example, to use beneficial insects to limit the spread of certain weeds that infest farmland. Biocontrol and Integrated Pest Management should be seen as ways of reducing the spread of certain weeds, and also as ways to reduce the burden on women and youth.
KROPFF: I agree. Similarly, weâre finding that small-scale mechanization is making a difference for youth, and also womenâs labor in Latin America, Africa and Asia, where CIMMYT has been introducing two-wheel tractors that can be engineered in local workshops. Suddenly, smallholders can harvest the entire wheat crop of 20 families in one day. This saves so much time, money, and effort, eliminating some of the âbadâ labor that may discourage youth and unfairly burden women. Farmers can focus on the âniceâ aspects of the business. Itâs a real game changer for family farming.
NICHOLLS: Yes and this can also be amplified through digital technology. People refer to the âUber-izationâ of tractors, where farmers are able to hire a piece of mechanical equipment for a very short space of time, and maybe it even comes with an experienced driver or operator. Weâre finding that digital tools like artificial intelligence, satellite imaging, smartphones, and other modern technologies, will intrigue youth anywhere in the world. These will hopefully have an impact on bringing more youth back into farming, as they start to see it as technologically enabled rather than straightforward muscle power.
On the transformations that need to happen
KROPFF: If we want to keep youth engaged, and improve farmersâ livelihoods, I think farming needs to become more entrepreneurial. Many family farms are only half a hectare. I think this has to grow somehow, though land rights and ownership are a challenge
NICHOLLS: As farming becomes more business-like in Africa then weâre going to see the same sort of consolidation that we saw in the United States and Europe, whereby farm sizes do get larger even if land ownership remains fragmented.
This could happen through cooperatives, which offer economies of scale and also help farmers spread the costs of things like access to inputs, advice, weather insurance and crop insurance. But we need to view cooperatives as more than a way to infuse new technologies into the farming system. They are in fact a channel for helping farmers gain stronger business skills, so they can get a better bargain for themselves.
KROPFF: In Mexico we are working with 300,000 smallholder farmers in a sustainable maize and wheat sourcing initiative. Rather than âpushingâ new varieties and technologies at farmers, we help them partner with maize and wheat companies to create a local demand for high quality, sustainable products. Real scaling up, especially for wheat and maize, needs more than extension. Farmers need better links to the market.
NICHOLLS: If farms get larger and more mechanized, it means fewer people are involved in the business of farming. This shift means that people will need other rural occupations, so that they donât just leave the land and move to the city. We need investments in other productive activities in rural areas. This could be around post-harvest processing of crops: adding value locally rather than shipping the raw materials elsewhere.
KROPFF: Exactly. Weâve been doing more work on this in the last ten years. CIMMYT works on wheat and maize, and these are products that need to be processed. Doing this locally would also help people save food in the future for more difficult times, instead of selling to someone from the city who may buy it for an unfair price. Farmers these days have access via smartphones to market information, which is empowering. We see it happening in Africa. Itâs really crucial.
NICHOLLS: Weâre certainly seeing the power of digital technologies, which are also helping us move beyond just responding to crop pests and diseases to being able to get better at predicting outbreaks on a micro-scale. By linking ground observations through our Plantwise clinics with satellite observation technology and data, weâve developed a program called PRISE (Pest Risk Information SErvice), which provides farmers with alerts before a pest is likely to reach its peak point, so that they can be prepared and take preventative measures.
KROPFF: Without a doubt, smallholder farmer communities are rapidly entering the digital age, and tools on weather prediction, selection of varieties, market information are very important and transforming the way people farm.
A farmer requests weather information via SMS.
On climate change
KROPFF: Climate change is going to be the issue affecting family farmers, especially in Asia and Africa where the population will grow by 2 billion people who need food that has been produced on their own continents. Yields have to rise and climate change brings yields down. We have to help smallholder family farmers keep doing their job and ensure crop yields, which is why climate change is embedded into 70% of our work at CIMMYT. One major area is developing and testing heat- and drought-tolerant varieties that suit local climates. Last year I was in Zimbabwe, which was experiencing El Niño, and I was very impressed by the difference in maize yields from drought and heat-tolerant varieties compared to the normal varieties.
NICHOLLS: Thatâs very good. In addition to drought and heat, we see pests and diseases appearing in new places as a result of climate change. Pests and diseases will cause crop losses of up to 40% on average. Stemming those losses is critical. Weâre seeing invasive species, such as fall armyworm, and many invasive weeds and trees that are effectively stealing arable and pastoral land from farmers, as well as water resources.
Pest-resistant crops have great long-term potential, but farmers also need short-term solutions while they wait for new varieties to become available. One of CABIâs strengths is scanning for solutions from other parts of the world. With fall armyworm, we are looking to South America, where the pest originates, for solutions and natural enemies. Weâre also scanning our fungal culture collection for samples that may have properties that can form the basis for biopesticides, and therefore open up a program of biological control.
Hopes for the future
NICHOLLS: Iâm very optimistic for family farmers. They are incredibly resilient and resourceful people, and they survive and thrive in pretty difficult circumstances. But the world is getting more challenging for them by the day. I think the Sustainable Development Goals (SDGs) have framed many of the issues very well, in terms of food security and livelihoods, sustainable consumption and production, and this will help to focus attention on family farmers.
I do see some quite encouraging signs, particularly in Africa, where the CAADP (Comprehensive Africa Agricultural Development Programme) has brought much greater coordination among countries. Weâre seeing more unity in the requests we receive from our member countries to help them address the issues that are in the SDGs. That makes the work of our organizations easier, because weâre addressing a broader set of demands. And in turn, that will benefit family farmers.
Technology, be it biotechnology or telecommunications and ICTs, is becoming so much more affordable over time. The rate that smartphone usage is spreading in Africa and Asia is incredible. In many areas we actually have most of the technology we need today. Itâs about getting it put into practice effectively with large numbers of farmers. So I remain very optimistic about the future.
KROPFF: Iâm an optimist by nature. Thatâs also why Iâm in this job: itâs not easy, but I really believe that change is possible if we have our act together and collaborate with CABI and other international research partners, national systems and the private sector. For a long time, people said that there was no Green Revolution in Africa, where yields remained one ton per hectare. But today we see yields increasing in countries like Nigeria, and in Ethiopia, where maize yields are 3.5 tons per hectare. Good things are happening because of family farming.
I believe that to increase yields you need three components: better seeds for more resilient crop varieties; sustainable intensification to grow more nutritious food per unit of water, land and soil; and good governance, to properly manage resources. We need to invest in all of these areas.
NICHOLLS: I fully agree. We need to work on all these areas, and harness the power of modern technology to help family farmers thrive now, and in the future.
This interview has been edited for length and clarity.
This yearâs African Green Revolution Forum (AGRF), which took place from September 3-6, 2019 in Accra, Ghana, focused on the potential of digital agriculture to transform African agriculture through innovations such as precision agriculture solutions for smallholder farmers, access to mobile financial services, data-driven agriculture, and ICT-enabled extension.
Committed to a digital transformation of African agricultural that benefits many, not a few.
Despite its importance of the continental economy and untapped resources, African farming sector is still dominated by ageing smallholders cultivating few acres of cropland, using not much inputs and lagging far behind productivity world standards.
Many experts believe digital agriculture could help African agriculture leapfrog to overcome its geographical, social and economic bottlenecks, bringing successful technologies to scale faster, and market opportunities even for remote smallholders. Some countries like Ghana or Kenya are becoming digital hubs for agritech-savvy young entrepreneurs along the food value chains, from drone for Ag, linking farmers to the marketplace, or offering mobile mechanization or financial services.
Improving smallholdersâ resilience through digital innovations
The millions of African rainfed farmers are in a risky business, from rising climate shocks to emerging pests and diseases like the invasive fall armyworm or the maize lethal necrosis. CIMMYT Director General Martin Kropff highlighted the importance of digital tools to predict these risks through smart, scalable early warning systems like the award-winning diagnostic tool Marple that helps map wheat rust outbreaks. Researchers can also better predict the farmsâ responses to these risks through accurate modelling. They can for instance better assess the potential yield benefits of drought and heat tolerance under different climate change scenarios.
CIMMYT crop breeders use tablet-based disease scoring applications and test new imagery and high-tech sensors for more accurate and cost-effective data collection. Kropff underlined the key role digital tools play to speed up science breakthroughs and impact delivery at the farm level.
Tailored advice for farmers and policy-makers to enable sustainable intensification
âThe future is no longer where it used to be. Farmersâ reality has become even more unpredictable,â said Enock Chikava, deputy director, agricultural development at the Bill & Melinda Gates foundation during a vivid debate on how to reshape the future agronomic research so it delivers more site-specific and responsive advice.
Much of the agronomy work within the region remains fragmented across research institutes, commodities and projects, and struggles to go beyond blanket recommendations that are most of the time not adapted to local farming conditions.
However, there is a fast-growing wealth of georeferenced data that can describe the diverse farming landscapes and socio-economic context of each African smallholder farmer. The starting point to exploit these data and get the right solutions for each farmer is to ask the right questions.
Moderated by Samuel Gameda, CIMMYT soil scientist, who shared the lessons from the Taking Maize Agronomy to Scale (TAMASA) project, this session on Agronomy at Scale discussed what public information goods like crop yield prediction maps or extension apps, such as the maize variety selector, would be the most useful for farmers and large-scale agronomic initiatives to trigger this much needed sustainable intensification of millions of African smallholdings. What investments would make a difference to scale the use of these new decision-support tools?
âAgronomic research must be carried out from a broader perspective of large-scale relevance and application. It is also more and more a joint effort and responsibility between smallholder farmers, the research community and public and private sectors, with each component playing specific and interacting roles. The current era of powerful and accessible ICT tools and big data analytics make this much more feasible and should be incorporated to enable precision agronomy for all, this is my take home message,â said Gameda.
âThis data revolution will only work if we invest in research data quality and data management,â stressed Bram Govaerts, CIMMYTâs Integrated Development Program director. âThat will generate better evidence for decision-makers to guide impact investment plans, deciding on which technology e.g. a new drought-tolerant crop variety and put the money in the right leveraging point,â Govaerts concluded.
The largest forum on African agriculture, AGRF 2019 gathered more than 2,200 delegates and high-level dignitaries, from heads of State and government officials to leaders of global and regional development institutions; top agri-food businesses and local entrepreneurs; financial institutions; mobile network operators and tech leaders, as well as lead representatives of farmer organizations.
Cover photo: Delegation from the International Maize and Wheat Improvement Center (CIMMYT) at the African Green Revolution Forum (AGRF) 2019.
A new study published in the Canadian Journal of Development Studies shows how some of Bangladeshâs indigenous women are overcoming social norms and institutional biases to gain direct access to maize and wheat agricultural innovations through developing women-led agricultural organizations, which benefit low-income Muslim women members as well.
Agriculture is important to Bangladeshâs economy and employs a large percentage of the male and female population as farmers, hired labor, and decision-makers. Bangladesh also has a positive policy commitment to gender equality. The UN Sustainable Development Goals are embedded into the countryâs national growth plans, including a strong commitment to Goal 5, Gender Equality, and Goal 10, Reduced Inequalities.
However, this new study shows that agricultural innovation programs are primarily directed at middle-income male farmers. Institutional biases in agricultural partners â extension officers, research organizations, policymakers, private sector partners and others â can hamper indigenous peoples and women from participating in wheatâmaize innovation processes, as they rarely meet the requisite criteria: sufficient land and social capital. In addition, their participation in markets varies according to their socioeconomic location in society.
Drawing on GENNOVATE case studies, the authors provide insights into how overlapping layers of disadvantage are being challenged in one community in northern Bangladesh.
Indigenous Santal women in the community are active in agriculture, both in the field and in decision-making, but are often marginalized by agricultural partners. Through mobilizing themselves organizationally into a woman-led agricultural organization, they have provided a forum for the delivery of technical training. This process has encouraged low-income Muslim women â who work in the field but are also marginalized by agricultural partners â to join the organization and benefit from training as well.
The findings provide insights into how agricultural research partners can work to strengthen the contribution and voices of the women who have long experienced differing forms of marginalization and to support their efforts to secure technical training.
The data used in this article is derived from GENNOVATE (Enabling Gender Equality in Agricultural and Environmental Innovation), a global research initiative supported by the Bill & Melinda Gates Foundation. This is a cross-CGIAR initiative examining how interactions between gender norms, agency and other contextual factors shape access to, adoption of and benefits from agricultural innovations in rural communities worldwide.
Trends in regional and chronological diversity of maize (zea mays l.) germplasm in Pakistan. 2019. Maqbool, M.A.| Aslam, M. | Issa, A.B. | Babar Manzoor Atta. In: Pakistan Journal of Botany v. 51, no. 2, p. 1-13.
Starting machinery to husk maize cobs at Green Farm near Kitale, Trans-Nzoia. (Photo: Peter Lowe/CIMMYT)
The development community is introducing increasingly complex and systemic technological designs for sustainable improvements to agriculture. Yet, a systemic perspective is hard to find in “adoption-outcome” focused analyses of technological change processes. In order to improve development interventions, it is necessary not only to analyze both successes and failures, but also the process and impacts of technological change.
Researchers at the International Maize and Wheat Improvement Center (CIMMYT) and the Institute of Development Studies (IDS) recently published a paper on rethinking technological change in smallholder agriculture, arguing against the conventional approach to studying technology adoption.
The problem with the concept of technology adoption
While the adoption rate of newly introduced technologies is still used in the evaluation of agricultural research and development, the theory of technology adoption is an insufficient framework for understanding technological change. It is too linear, too binary, too focused on individual decisions and gives an inaccurate and misleading picture to researchers.
The theory of adoption treats technology like a âblack boxâ that is transferred smoothly from one setting to another, following a linear progression of old and inferior tools and methods to new improved ones. This theory is too simplistic to align with the complex realities of the capabilities and agency of multiple actors. In addition, in cases of participatory technology development, where intended users are involved in the creation of innovations, adoption rates are often limited due to the relatively small scale of the project.
Using adoption rate as the only indicator of success or failure can lead researchers to ignore wider impacts of the introduction of a new technology. Adoption rates could go up, but use of a new technology could cause harm to social relations, the local environment, or its resilience. Low adoption rates could classify a program as a failure, while farmers benefited substantially in undetected ways, for example forming networks or acquiring new skills and knowledge. A singular focus on adoption rates thus limits our understanding of what happens in processes of technological change.
Farmer Kausila Chanara direct dry seeding rice in Ramghat, Surkhet, Nepal. (Photo: Peter Lowe/CIMMYT)
An alternative conceptual framework
In addition to the introduction of a new technology to small-scale farming systems, technological change involves the agency of many social actors. The agency of farmers, scientists, project managers and extension officers is key to understand whether a new technology is perceived to be useful, accessible or realistic, as well as how it is adjusted and changing social relations.
A new framework is needed to capture this reconfiguration of social and technological components that result from the introduction of a new technology to a community.
The authors of this paper propose an alternative conceptual framework with an agent-, practice- and process-oriented approach to better understand technological change. The framework is composed of four key components: propositions, encounters, dispositions and responses.
Propositions are composed of artefacts, methods, techniques and practices and a proposed mode of engagement in agricultural production. Encounters can be deliberately organized, for example a field day, or spontaneous, when a farmer sees a neighbor using a new tool. Intended users of technology may be disposed to respond in a variety of different ways, and dispositions may change over time. Finally, responses are a process or pathway that is likely to involve adjustment or recalibration to make the new technology work for the farmer.
Further work to operationalize this framework is needed. The authors suggest a next step of developing indicators to measure learning, experimentation and behavioral change as part of analyzing technological change processes.
Visitors at CIMMYTâs experimental station in Obregon, Mexico, where elite wheat lines are tested for new traits.
For a number of reasons, including limited interdisciplinary collaboration and a dearth of funding, revolutionary new plant research findings are not being used to improve crops.
âTranslational researchâ â efforts to convert basic research knowledge about plants into practical applications in crop improvement â represents a necessary link between the world of fundamental discovery and farmers’ fields. This kind of research is often seen as more complicated and time consuming than basic research and less sexy than working at the âcutting edgeâ where research is typically divorced from agricultural realities in order to achieve faster and cleaner results; however, modern tools â such as genomics, marker-assisted breeding, high throughput phenotyping of crop traits using drones, and speed breeding techniques â are making it both faster and cost-effective.
In a new article in Crop Breeding, Genetics, and Genomics, wheat physiologist Matthew Reynolds of the International Maize and Wheat Improvement Center (CIMMYT) and co-authors make the case for increasing not only funding for translational research, but the underlying prerequisites: international and interdisciplinary collaboration towards focused objectives and a visionary approach by funding organizations.
âItâs ironic,â said Reynolds. âMany breeding programs have invested in the exact technologies â such as phenomics, genomics and informatics â that can be powerful tools for translational research to make real improvements in yield and adaptation to climate, disease and pest stresses. But funding to integrate these tools in front-line breeding is quite scarce, so they arenât reaching their potential value for crop improvement.â
Members of the International Wheat Yield Partnership (IWYP) which focuses on translational research to boost wheat yields.
Many research findings are tested for their implications for wheat improvement by the International Wheat Yield Partnership (IWYP) at the IWYP Hub, a centralized technical platform for evaluating innovations and building them into elite wheat varieties, co-managed by CIMMYT at its experimental station in Obregon, Mexico.
IWYP has its roots with the CGIAR Research Program on Wheat (WHEAT), which in 2010 formalized the need to boost both wheat yield potential as well as its adaptation to heat and drought stress. The network specializes in translational research, harnessing scientific findings from around the world to boost genetic gains in wheat, and capitalizing on the research and pre-breeding outputs of WHEAT and the testing networks of the International Wheat Improvement Network (IWIN). These efforts also led to the establishment of the Heat and Drought Wheat Improvement Consortium (HeDWIC).
âWeâve made extraordinary advances in understanding the genetic basis of important traits,â said IWYPâs Richard Flavell, a co-author of the article. âBut if they arenât translated into crop production, their societal value is lost.â
The authors, all of whom have proven track records in both science and practical crop improvement, offer examples where exactly this combination of factors led to the impactful application of innovative research findings.
Improving the Vitamin A content of maize: A variety of maize with high Vitamin A content has the potential to reduce a deficiency that can cause blindness and a compromised immune system. This development happened as a result of many translational research efforts, including marker-assisted selection for a favorable allele, using DNA extracted from seed of numerous segregating breeding crosses prior to planting, and even findings from gerbil, piglet and chicken models â as well as long-term, community-based, placebo-controlled trials with children â that helped establish that Vitamin A maize is bioavailable and bioefficacious.
Flood-tolerant rice: Weather variability due to climate change effects is predicted to include both droughts and floods. Developing rice varieties that can withstand submergence in water due to flooding is an important outcome of translational research which has resulted in important gains for rice agriculture. In this case, the genetic trait for flood tolerance was recognized, but it took a long time to incorporate the trait into elite germplasm breeding programs. In fact, the development of flooding tolerant rice based on a specific SUB 1A allele took over 50 years at the International Rice Research Institute in the Philippines (1960â2010), together with expert molecular analyses by others. The translation program to achieve efficient incorporation into elite high yielding cultivars also required detailed research using molecular marker technologies that were not available at the time when trait introgression started.
Other successes include new approaches for improving the yield potential of spring wheat and the discovery of traits that increase the climate resilience of maize and sorghum.
One way researchers apply academic research to field impact is through phenotyping. Involving the use of cutting edge technologies and tools to measure detailed and hard to recognize plant traits, this area of research has undergone a revolution in the past decade, thanks to more affordable digital measuring tools such as cameras and sensors and more powerful and accessible computing power and accessibility.
Scientists are now able to identify at a detailed scale plant traits that show how efficiently a plant is using the sunâs radiation for growth, how deep its roots are growing to collect water, and more â helping breeders select the best lines to cross and develop.
An Australian pine at CIMMYTâs experimental station in Texoco, Mexico, commemorates the 4th symposium of the International Plant Phenotyping Network.
Phenotyping is key to understanding the physiological and genetic bases of plant growth and adaptation and has wide application in crop improvement programs. Recording trait data through sophisticated non-invasive imaging, spectroscopy, image analysis, robotics, high-performance computing facilities and phenomics databases allows scientists to collect information about traits such as plant development, architecture, plant photosynthesis, growth or biomass productivity from hundreds to thousands of plants in a single day. This revolution was the subject of discussion at a 2016 gathering of more than 200 participants at the International Plant Phenotyping Symposium hosted by CIMMYT in Mexico and documented in a special issue of Plant Science.
There is currently an explosion in plant science. Scientists have uncovered the genetic basis of many traits, identified genetic markers to track them and developed ways to measure them in breeding programs. But most of these new findings and ideas have yet to be tested and used in breeding programs, wasting their potentially enormous societal value.
Establishing systems for generating and testing new hypotheses in agriculturally relevant systems must become a priority, Reynolds states in the article. However, for success, this will require interdisciplinary, and often international, collaboration to enable established breeding programs to retool. Most importantly, scientists and funding organizations alike must factor in the long-term benefits as well as the risks of not taking timely action. Translating a research finding into an improved crop that can save lives takes time and commitment. With these two prerequisites, basic plant research can and should positively impact food security.
Authors would like to acknowledge the following funding organizations for their commitment to translational research.
The International Wheat Yield Partnership (IWYP) is supported by the Biotechnology and Biological Sciences Research Council (BBSRC) in the UK; the U. S. Agency for International Development (USAID) in the USA; and the Syngenta Foundation for Sustainable Agriculture (SFSA) in Switzerland.
The Heat and Drought Wheat Improvement Consortium (HeDWIC) is supported by the Sustainable Modernization of Traditional Agriculture (MasAgro) Project by the Ministry of Agriculture and Rural Development (SADER) of the Government of Mexico; previous projects that underpinned HeDWIC were supported by Australiaâs Grains Research and Development Corporation (GRDC).
The Queensland Governmentâs Department of Agriculture and Fisheries in collaboration with The Grains Research and Development Corporation (GRDC) have provided long-term investment for the public sector sorghum pre-breeding program in Australia, including research on the stay-green trait. More recently, this translational research has been led by the Queensland Alliance for Agriculture and Food Innovation (QAAFI) within The University of Queensland.
ASI validation work and ASI translation and extension components with support from the United Nations Development Programme (UNDP) and the Bill and Melinda Gates Foundation, respectively.
Financial support for the maize proVA work was partially provided by HarvestPlus (www.HarvestPlus.org), a global alliance of agriculture and nutrition research institutions working to increase the micronutrient density of staple food crops through biofortification. The CGIAR Research Program MAIZE (CRP-MAIZE) also supported this research.
The CGIAR Research Program on Wheat (WHEAT) is led by the International Maize and Wheat Improvement Center (CIMMYT), with the International Center for Agricultural Research in the Dry Areas (ICARDA) as a primary research partner. Funding comes from CGIAR, national governments, foundations, development banks and other agencies, including the Australian Centre for International Agricultural Research (ACIAR), the UK Department for International Development (DFID) and the United States Agency for International Development (USAID).
After a visit to CIMMYT headquarters, germplasm bank and maize nutritional quality laboratory, the Indonesian Agency for Agricultural Research and Development is increasing cooperation in maize and wheat research with CIMMYT. Read more here.
Ensuring the access of small-scale farmers to products and potential benefits from genetic engineering (GE) technologies for agriculture will require concerted investment and research by public institutions worldwide and particularly in low- and middle-income countries.
This was a key conclusion of a new review paper describing cutting-edge GE applications that offer exciting options to enhance the disease and pest resistance of important food crops and the ecological sustainability of cropping systems.
The technologies include gene editing (site-specific changes to DNA in a genome), gene drives (greatly enhancing or reducing frequency of genes that affect insect or pathogen reproduction), and synthetic biology (re-design or construction of biological devices, for example chromosomes or organelles).
Authored by international experts in policy, socioeconomics, and biological science, the new paper outlines potential uses of the technologies, particularly to address problems that affect resource-poor farmers or consumers, such as the viruses that attack cassava, the Striga weed that is a parasite of maize, or the fungal pathogen of groundnut that produces deadly toxins.
A weak capacity for research and development in many countries, combined with a small and declining public investment, raises questions about those nationsâ ability to develop and deliver high-quality GE technologies or realize their benefits.
âThe concern is that farmers not served by leading companies, who are developing the technologies, will be unable to obtain new, resistant crop varieties or other products of these technologies,â said Kevin Pixley, director of the genetic resources program of the International Maize and Wheat Improvement Center (CIMMYT) and first author of the new paper.
The technologies have already proven effective for controlling bacterial, fungal, and viral plant pathogens, as well as insects that transmit them. For example, GE approaches to control cassava brown streak disease and cassava bacterial blightâfor which there are few or no known sources of resistance in cassava itselfâappear on track to produce resistant versions of cassava.
Future gene drive technologies that can be kept within specific areas and reversed if needed may offer ways to control insects that carry plant diseases or weeds that damage crops, and synthetic biology could someday create plants that are immune to invading viruses.
Institutional forces (arrows) alter the balance of public vs private research / development investments and the relative emphasis on low vs high value crops, factors that help determine who benefits (resource-poor vs wealthy farmers?) from the application of advanced technologies in crop breeding. (Figure: Nancy Valtierra/CIMMYT)
Many countries are still deciding whether and how they will regulate new GE products. The new paper explains how key factors including the cost and complexity of complying with biosafety regulations will shape the potential distribution of the technologies and products, determining which institutions undertake the related research and, as a result, which traits and crops are studied.
Civil society concerns regarding GE technologies and how or by whom they are deployed add important considerations to the complex questions surrounding the use of GE products.
âRealizing the potential of GE crops will require investments and policies for research, intellectual property regimes, and regulatory frameworks,â say the authors, âand societies must also address legitimate concerns about their responsible stewardship, agroecological sustainability, and equitable access to associated benefits.â
An open-access version of the full paper is available online: https://doi.org/10.1146/annurev-phyto-080417-045954
Pixley, K.V., J.B. Falck-Zepeda, K.E. Giller, L.L. Glenna, F. Gould, C.A. Mallory-Smith, D.M. Stelly, and C.N. Stewart. 2019. Genome editing, gene drives, and synthetic biology: Will they contribute to disease-resistant crops, and who will benefit? Annu. Rev. Phytopathol 57:8.1â8.24.
A delegation of the Indonesian Agency for Agricultural Research and Development (IAARD) visited the International Maize and Wheat Improvement Center (CIMMYT) to reaffirm their research partnership. Led by the Director General of IAARD, Fadjry Djufry, a group of Indonesian researchers and leaders visited CIMMYT on August 28 and August 29.
CIMMYT and IAARD have collaborated on research since 1981, when an Indonesian researcher participated in CIMMYT trainings. Since 1995, CIMMYT has worked with Indonesia through joint research and donations of inbred lines. CIMMYT has helped the Indonesian Cereals Research Institute (ICERI) in establishing infrastructure for a drought-tolerant nursery and has sponsored ICERI researchers to attend international scientific meetings. The CIMMYT-organized Asian Maize Biotechnology Network supported a satellite molecular laboratory for ICERI.
During the visit, the Indonesian delegation signed a memorandum of understanding with CIMMYT. Visitors also attended presentations on CIMMYT’s progress and strategy, toured the germplasm bank, visited the maize nutrition quality lab, and did a field visit to learn about sustainable intensification and climate change adaptation.
After CIMMYT director general Martin Kropff gave an overview of CIMMYT, the IAARD delegation presented their work and innovations to increase maize and wheat production. Indonesian researchers have released high yielding maize varieties, functional maize varieties and hybrid maize varieties. Farmers are intercropping maize, rice and soybeans. Post-harvest technology, mechanization and mapping have contributed to maize productivity.
IAARD also outlined its strategy to contribute to the government’s target of food self-sufficiency to become the world’s food basket by 2045.
IAARD suggested future collaboration with CIMMYT to help achieve this goal, including working together on research and development of improved maize and wheat, a double haploid for maize, water management, climate-smart agriculture and data management for genetic resources.
Elite wheat varieties at CIMMYTâs experimental station in Ciudad Obregon, in Mexico’s Sonora state. (Photo: Marcia MacNeil/CIMMYT)
In a new study, scientists have found that genome segments from a wild grass are present in more than one in five of elite bread wheat lines developed by the International Maize and Wheat Improvement Center (CIMMYT).
Scientists at CIMMYT and other research institutes have been crossing wild goat grass with durum wheat â the wheat used for pasta â since the 1980s, with the help of complex laboratory manipulations. The new variety, known as synthetic hexaploid wheat, boosts the genetic diversity and resilience of wheat, notoriously vulnerable due to its low genetic diversity, adding novel genes for disease resistance, nutritional quality and heat and drought tolerance.
The study, which aimed to measure the effect of these long-term efforts using state-of-the-art molecular technology, also found that 20% of CIMMYT modern wheat lines contain an average of 15% of the genome segments from the wild goat grass.
“Weâve estimated that one-fifth of the elite wheat breeding lines entered in international yield trials has at least some contribution from goat grass,” said Umesh Rosyara, genomic breeder at CIMMYT and first author of the paper, which was published in Nature Scientific Reports. “This is much higher than expected.”
Although the synthetic wheat process can help bring much-needed diversity to modern wheat, crossing with synthetic wheat is a complicated process that also introduces undesirable traits, which must later be eliminated during the breeding process.
“Many breeding programs hesitate to use wild relatives because undesirable genomic segments are transferred in addition to desirable segments,” said Rosyara. “The study results can help us devise an approach to quickly eliminate undesirable segments while maintaining desirable diversity.”
CIMMYT breeding contributions are present in nearly half the wheat sown worldwide, many of such successful cultivars have synthetic wheat in the background, so the real world the impact is remarkable, according to Rosyara.
“With this retrospective look at the development and use of synthetic wheat, we can now say with certainty that the best wheat lines selected over the past 30 years are benefiting from the genes of wheatâs wild relatives,” he explained. “Even more, using cutting-edge molecular marker technology, we should be able to target and capture the most useful genes from wild sources and better harness this rich source of diversity.”
Modern breeders tread in natureâs footsteps
The common bread wheat we know today arose when an ancient grain called emmer wheat naturally cross-bred with goat grass around 10,000 years ago. During this natural crossing, very few goat grass genes crossed over, and as a result, current bread wheat is low in diversity for the genome contributed by goat grass. Inedible and considered a weed, goat grass still has desirable traits including disease resistance and tolerance to climate stresses.
Scientists sought to broaden wheat’s genetic diversity by re-enacting the ancient, natural cross that gave rise to bread wheat, crossing improved durum wheat or primitive emmer with different variants of goat grass. The resulting synthetic wheats were crossed again with improved wheats to help remove undesirable wild genome segments.
Once synthetic wheat is developed, it can be readily crossed with any elite wheat lines thus serving as a bridge to transfer diversity from durum wheat and wild goat grass to bread wheat. This helps breeders develop high yielding varieties with desirable traits for quality varieties and broad adaption.
CIMMYT is the first to use wheatâs wild relatives on such a large scale, and the synthetic derivative lines have been used by breeding programs worldwide to develop popular and productive bread wheat varieties. One example, Chuanmai 42, released in China in 2003, stood as the leading wheat variety in the Sichuan Basin for over a decade. Other synthetic derivative lines such as Sokoll and Vorobey appear in the lineage of many successful wheat lines, contributing crucial yield stability â the ability to maintain high yields over time under varying conditions.
The successful, large-scale use of genes from wheatâs wild relatives has helped broaden the genetic diversity of modern, improved bread wheat nearly to the level of the cropâs heirloom varieties. This diversity is needed to combat future environmental, pest, and disease challenges to the production of a grain that provides 20% of the calories consumed by humans worldwide.
This work was supported by the CGIAR Research Program on Wheat (WHEAT) and Seeds of Discovery (SeeD), a multi-project initiative comprising MasAgro Biodiversidad, a joint initiative of CIMMYT and the Ministry of agriculture and rural development (SADER) through the MasAgro (Sustainable Modernization of Traditional Agriculture) project; the CGIAR Research Programs on Maize (MAIZE) and Wheat (WHEAT); and a computation infrastructure and data analysis project supported by the UKâs Biotechnology and Biological Sciences Research Council (BBSRC). CIMMYTâs worldwide partners participated in the evaluation of CIMMYT international wheat yield trials.
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About the CGIAR Research Program on Wheat
The CGIAR Research Program on Wheat (WHEAT) is led by the International Maize and Wheat Improvement Center (CIMMYT), with the International Center for Agricultural Research in the Dry Areas (ICARDA) as a primary research partner. Funding comes from CGIAR, national governments, foundations, development banks and other agencies, including the Australian Centre for International Agricultural Research (ACIAR), the UK Department for International Development (DFID) and the United States Agency for International Development (USAID).
About CIMMYT
The International Maize and Wheat Improvement Center (CIMMYT) is the global leader in publicly funded maize and wheat research and related farming systems. Headquartered near Mexico City, CIMMYT works with hundreds of partners throughout the developing world to sustainably increase the productivity of maize and wheat cropping systems, thus improving global food security and reducing poverty. CIMMYT is a member of CGIAR and leads the CGIAR Research Programs on Maize and Wheat, and the Excellence in Breeding Platform. The center receives support from national governments, foundations, development banks and other public and private agencies.