Research Associate at the Soil Borne Diseases Program at CIMMYT, Turkey. Gul got her PhD degree from the University of Osmangazi, Eskisehir-Turkey, in 2009. Her PhD thesis was entitled as: âThe Identification of resistance and genetic control of Fusarium crown rot in wheatâ. She joined CIMMYT International Soil Borne Pathogens (SBPs) Program in Turkey to conduct work on SBPs especially the Dryland Root Rot disease (Crown Rot) caused by Fusarium culmorum on wheat in 2006 as well as screening wheat germplasm against cereal nematodes i.e., the Cereal Cyst Nematodes (Heterodera spp) and the Root Lesion Nematodes (Pratylenchus spp). She is highly involved in writing peer reviewed articles, capacity building activities, international meetings, co-supervising national and international students, training researchers from many countries.
Emrah Koç is an Assistant Research Associate at the International Winter Wheat Improvement Program (IWWIP) at CIMMYT-Turkey, where he has been working since 2011. He has over a decade of experience in winter wheat breeding, field evaluation, and international research collaboration. His current responsibilities include germplasm development, data analysis, and coordination of regional international nursery distribution. From 2018 to 2019, Emrah served as a Training and Monitoring Officer for the Regional Wheat Landraces Project, which aimed to improve food security by enhancing wheat production and its resilience to climate change through the conservation of currently cultivated landrace diversity. He got his masterâs degree in 2020 from EskiĆehir Osmangazi University, with a thesis titled “Agronomic Performance of Modern Wheat Germplasm and Landraces Recently Collected in Turkey, Iran, and Afghanistan.” He is currently pursuing a PhD in Plant Breeding and Genetics at Ege University in Ä°zmir, Turkey. His research interests include wheat landrace diversity, rust resistance, and speed breeding techniques. Emrah has participated in numerous international workshops and has contributed to several peer-reviewed scientific publications.
Scientists from the Research Institute of Plant Genetic Resources in Uzbekistan (RIPGR) attended training on gene bank management and genetic resources, coordinated by CIMMYT-TĂŒrkiye on 13-20 April 2024. Hosted at the Turkish Department of Agricultural Economics and Project Management (TAGEM), the training is supported by the World Bank Group, which is helping Uzbekistan to modernize the countryâs agriculture. With one of the highest levels of wheat consumption in Central Asia, the modernization project aims to increase Uzbekistanâs wheat yield and meet demand for the crop.
The course included lectures on status and activity of the Turkish Seed Germplasm Bank (TSGB), policy instruments and international perspectives on plant genetic resources, herbarium techniques, biotechnology studies, and genetic resources. Uzbek scientists also became acquainted with scientific laboratories, visiting the field station in Ä°kizce GölbaĆı and learned about the breeding, pathology, and agronomy activities at the station as well as the collaboration activities between CGIAR Research Centers and TAGEM.
Country-wide expertise
In addition to sessions at CIMMYT’s office in TĂŒrkiye, participants also visited the National Gene Bank in Ankara and the National Gene Bank of Izmir.
At the latter location, experts delivered sessions on a range of topics, such as the Plant Diversity and Genetic Resources Program of TĂŒrkiye; in vitro and cryopreservation techniques; the conservation, data recording, and documentation of plant genetic resources; conservation and utilization of vegetable genetic resources; conservation studies on mushroom genetic resources; studies on wheat genetic resources and wheat breeding at the international winter wheat breeding program; regional collaboration to combat wheat rust disease in Central and West Asia and North Africa (CWANA); and international winter wheat breeding strategies.
In addition to the seminar sessions, the participants also visited several locations to familiarize themselves with scientific processes in field and laboratory conditions. They visited the field gene banks, guided by Fatih ĂaÄir, who provided brief information about the fruit genetic resources activities of TĂŒrkiye. They also visited the plant collection activities and herbarium techniques laboratory, the National Gene Bank, Herbarium, Fungarium & Seed Physiology Laboratory of the Plant Genetics Resources Department & Plant Tissue Center, and the Regional Cereal Rust Research Center.
The importance of the training course for Uzbek scientists is to study the system of rational use, conservation, and management of plant genetic resources of TĂŒrkiye and to introduce new innovative knowledge in Uzbekistan. It also consists of discussing aspects related to bilateral cooperation and sustainable development in the field of plant genetic resources as well gene bank management.
The delegation from Uzbekistan, on behalf of the Ministry of Agriculture of the Republic of Uzbekistan, and the director of the Research Institute of Plant Genetic Resources, Zafarjon Mashrapovich Ziyaev, expressed their deep gratitude to the organizers and departments for this training course.
Soil is the foundation of agriculture, and healthy soil is critical to the entire ecosystem. However, soil health is under threat today as many factors make soil unhealthy, leading to significant losses in farming. CIMMYT in India has been addressing these issues in partnership with national and international institutions, while CIMMYTâs SBP program in TĂŒrkiye aims to deliver high-yielding wheat germplasm that is resistant to SBP and supports the International Soil-Borne Pathogens Research & Development Center (ISBPRDC) of TĂŒrkiye. It also facilitates knowledge exchange and technology transfer to support joint research and development activities to improve soil health.
On arrival, the group of scientists and professors from Bihar was welcomed by Metin TĂŒrker, director general of Agricultural Research and Policies (TAGEM). Talking about the intricate nexus of agriculture, climate, and technology, TĂŒrker emphasized varietal developments to irrigation advancements and engaged in lively discussions with the group, fueled by a shared vision for agricultural sustainability.
Led by Abdelfattah A. Dababat, CIMMYT country representative in TĂŒrkiye and the leader of the SBD program, the scientists and professors from India ventured into the heart of research institutions, immersing themselves in the latest innovations in wheat improvement and plant pathology. Their journey took them from Ankara to Eskisehir and ended at the Abant Izzet Baysal University, Bolu, where they were greeted by passionate experts eager to share their knowledge. Bonds were forged amid lectures and laboratory demonstrations, and ideas ignited, paving the way for future collaborations.
Visit to Ankara Province
The participants visited the Field Crops Central Research Institute and were introduced to the TAGEM Seed Gene Bank and Herbarium. Participants were acquainted with seed processing and preservation methods with live demonstrations. Following that, participants visited the Plant Protection Central Research Institute in Ankara, where its Director Ayse Ozdem gave an overview of the institute’s mandates and research work. Participants had the opportunity to explore the plant pathology laboratory and learn about major crop diseases in TĂŒrkiye and their control measures.
Participants later visited winter wheat trial sites at the research station in Haymana, a district of Ankara province. The group then interacted with Mesut Keser, ICARDAâs wheat breeder who specializes in winter and facultative wheat while working on the International Winter Wheat Improvement Program (IWWIP). This was followed by a visit to the pathology field experiments, a breeder seed production area, and an experimental trial for evaluating Syngenta TYMIRIUMÂź technology at the research station.
Visit to TZARI in Eskisehir
Scientists also had a chance to visit the Transitional Zone Agricultural Research Institute located in the Central Anatolian Plateau of TĂŒrkiye. The institute’s director Sabri Cakir welcomed the participants and briefed them about the ongoing research activities of the institute and its relevance to agriculture in TĂŒrkiye. Savas Belen gave a general overview of the institute and the breeding program, while Abdullah Tane Kilinc presented a glimpse of the activities of the Department of Plant Pathology. Professor Halil Toktay gave an overview of plant parasitic nematodes in wheat and potato, followed by GĂŒl Erginbas Orakci who discussed the importance of managing soil-borne pathogens.
Beyhan Akin, wheat breeder at CIMMYT, gave a presentation on CIMMYT’s breeding activities in TĂŒrkiye, and OÄuz Ănder presented fertilizer application on the quality of Bread Wheat and the importance of foliar fertilization in crops.
Thereafter, participants visited the plant pathology laboratory where Abdelfattah A. Dababat and GĂŒl Erginbas-Orakci gave an overview of laboratory methods to study Cereal Cyst Nematodes and Root-Lesion Nematodes with live demonstrations. Innovative approaches to tackle the Plant-Parasitic Nematodes in agriculture were also discussed. In the agronomy laboratory, OÄuz Ănder gave a live demonstration for estimating plant grain and biomass yield by optical sensor-based technologies. Participants also had the opportunity to explore the soil science laboratory and become familiar with state-of-the-art equipment used for soil nutrient analysis.
Visit to Bolu
The participants visited Abant Izzet Baysal University, in Bolu, where the Rector Professor. Mustafa AliĆarlı welcomed them. This was followed by presentations and discussions on burning issues in agriculture. Professor Senol Yildiz gave a presentation on soil health assessment and management. Professor Halil KĂŒtĂŒk of the Department of Plant Protection gave a brief overview of the latest research advancement in biological control of major crop diseases. In continuation, Abdelfattah A. Dababat gave an overview of the cereal cyst nematode and their management. The discussion led to a brainstorming session on soil health management, soil-borne diseases, soil microbiome, and the challenges of using microorganisms for soil health improvements. The major challenges and opportunities for agriculture development under changing climate scenarios in India and TĂŒrkiye were also discussed.
The training course exposed participants to the latest research and technologies for soil and root health management to increase agricultural productivity and profitability immediately and into the future. During the entire visit, participants working in different fields (soil science, agronomy, plant breeding, and microbiology) interacted with TĂŒrkiye’s expert counterparts to discuss their work and share valuable research insights. Several topics and technologies relevant to global agriculture, like zero tillage, climate-resilient agriculture, precision input management, hidden hunger, and digital agriculture, were discussed. Participants also explored future opportunities for bilateral research collaborations between India and TĂŒrkiye.
Participants expressed their deepest gratitude to the CIMMYT team at TĂŒrkiye, led by Abdelfattah A. Dababat, for arranging an effective training program and for the support provided at every step. âYour careful planning and thoughtful execution have created an environment where learning flourishes and connections are made. Thank you for your invaluable contribution to our learning journey,â said the participants. Participants also expressed their sincere thanks to the Ministry of Agriculture, TĂŒrkiye, and the BISA team for coordinating this training and making the entire experience seamless and impactful for all involved. Special thanks were offered to the Government of Bihar for supporting the travel of scientists from India for this training program under the climate-resilient agriculture project in the state.
Staff of the International Soil Borne Pathogens Research and Development Center along with the Minister, deputy ministers, TAGEMâs DG, and high-level officials of the Ministry of Agriculture Forestry. (Photo: TAGEM)
Soil-borne pathogens (SBP) are a serious threat to Turkeyâs food security, especially as climate extremes (temperature, precipitations) become more commonplace. SBP are an array of specific adverse effects, such as root rot, wilt, yellowing, and dwarfing caused by fungi, bacteria, viruses, and nematodes. These pathogens can cause 50-75% yield loss in crops.
On May 2, 2023, the International Maize and Wheat Improvement Center (CIMMYT) Country Representative in Turkey, Abdelfattah Dababat, joined the inauguration ceremony of the International Soil-Borne Pathogens Research & Development Center (ISBPRDC).
Vahit KiriĆci, Turkish Minister of Agriculture and Forestry, inaugurated the Center, which is the first of its kind in the Central West Asia and North Africa (CWANA) region dedicated to advancing research on SBPs and developing innovative solutions to control and prevent their spread.
The opening ceremony took place at the Directorate of Plant Protection Central Institute working under the General Directorate of Agricultural Research and Policies (TAGEM), and it was attended by deputy ministers, TAGEMâs DG, and high-level officials of the Ministry of Agriculture and Forestry.
Serving under the auspices of the General Directorate of Agricultural Research and Policies (TAGEM), part of the Turkish Minister of Agriculture and Forestry, the ISBPRDC will meet international standards for sanitary conditions.
CGIAR and TAGEM mutually supported the SBP CIMMYT Turkey program by establishing and funding the ISBPRDC.
Bringing partners together
CIMMYT is signing a collaboration agreement with the ISBPRDC to facilitate knowledge exchange and technology transfer between the two institutions, which will support joint research and development activities aimed at improving crop health and productivity.
âThe most effective way forward to battle against threats to food security is through cooperation,â said Dababat. âThis collaboration is a great opportunity for Turkeyâs seed industry to maintain its competitive advantage in foreign markets.â
Professor Vahit KiriĆci, Turkish Minister of Agriculture and Forestry, TAGEMâs DG, CIMMYT’s Representative, and high-level officials from the Ministry of Agriculture and Forestry. (Photo: TAGEM)
Thirty-five scientists and technicians will work at the ISBPRDC and the institute will act as an umbrella for all SBP research in Turkey. Bahri DaÄdaĆ International Agricultural Research Institute (BDIARI), the Transitional Zone Agricultural Research Institute (TZARI), and the Plant Protection Central Research Institute (PPCRI) with offices in Konya, Eskisehir, and Ankara, respectively, will support the ISBPRDC center and collaborate with the SBP program at CIMMYT to deliver high-yielding wheat germplasm that is resistant to SBP.
Among new programs at the center are the development of a robust surveillance system to track pathogens, a genebank for germplasm, and screening facilities for resistance against SBP.
This trip was an extension of their visit to the TĂŒrkiye Akdeniz University, Antalya, under the ICAR-NAHEP overseas fellowship program. The trip to CIMMYT program in TĂŒrkiye was with the objective to get exposure to CIMMYT’s germplasm and other new developments in wheat improvement that may be helpful for wheat production in the Northern Hill zone of India, which grows wheat on around 0.8 million hectares.
Ajaz Ahmed Lone, Principal Scientist, Genetics and Plant Breeding at the Dryland Agricultural Research Station, and Shabir Hussain Wani, Scientist, Genetics and Plant Breeding and Principal Investigator, aimed to learn more about CIMMYTâs wheat improvement systems.
Meeting at TAGEM, from left to right: Hilal Ar, Amer Dababat, Ajaz Lone, Shabir Wani, Fatma Sarsu, Aykut Ordukaya. (Photo: TAGEM)
After a brief introduction on CIMMYTâs international and soil borne pathogens program in TĂŒrkiye by Abdelfattah Dababat, CIMMYT Country Representative for TĂŒrkiye and program leader, the visitors met with General Directorate of Agricultural Research and Policies (TAGEM) representative Fatma Sarsu and her team to discuss possible collaboration and capacity building between the two institutions.
AyĆe Oya Akın, Amer Dababat, Shabir Wani, Sevinc Karabak, Senay Boyraz Topaloglu, Ajaz Lone and Durmus Deniz outside of the GenBank in Ankara, TĂŒrkiye. (Photo: GenBank)
Wheat improvement in TĂŒrkiye
Lone and Wani also visited the GenBank in Ankara to meet its head, Senay Boyraz Topaloglu, who gave a presentation about the GenBank and highlighted the siteâs various facilities.
They then visited the Transitional Zone Agricultural Research Institute (TZARI) in Eskisehir, located in Central Anatolian Plateau of TĂŒrkiye, to hear about historical and current studies, particularly within the national wheat breeding program delivered by Head of the Breeding Department, Savas Belen. Belen briefed the visitors about the instituteâs facilities, and the collaboration with CIMMYT scientists on wheat breeding activities and germplasm exchange.
Dababat and Gul Erginbas-Orakci, research associate at CIMMYT, presented an overview of soil borne pathogens activities in TZARI-Eskisehir.
Before the visitors departed to Konya, Director of TZARI, Sabri Cakir, welcomed the visitors in his office.
Visitors to TZARI, from left to right: Sali Sel, Shabir Wani, Ajaz Lone, Sabri Cakir, Amer Dababat, Savas Belen, Gul Erginbas-Orakci. (Photo: TZARI)
On the final day, the scientists were briefed about Bahri Dagdas International Agricultural Research Institute (BDIARI) through a presentation given by Murat Nadi Tas and Musa Turkoz. Bumin Emre Teke from the animal department presented a European project report on animal breeding, and Mesut Kirbas provided an overview of a European project on e-organic agriculture, as well as visits to the instituteâs laboratory and field facilities and the newly established soil borne pathogens field platform.
Dababat said, âIt was a fruitful short trip which enabled scientist from SKUAST-Kashmir and CIMMYT-TĂŒrkiye to share knowledge about wheat improvement activities and will give way to a road map for future research collaborations between the three institutions.â
Musa Turkoz, Amer Dababat, Ajaz Lone, Shabir Wani, Gul Erginbas-Orakci, Murat Nadi Tas, Bumin Emre Teke and Mesut Kirbas visit the BDIARI site in Konya, TĂŒrkiye. (Photo: BDIARI)
Kazakhstan is the ninth largest country in the world and the fourteenth largest producer of wheat; in 2021 alone, the country produced 14.3 million tons (t) of wheat on 12.1 million hectares (ha). Despite this impressive figure, wheat yield in the country falls below average at 1172.5 t/ha compared to 3474.4 t/ha globally.
Research into wheat diseases in Kazakhstan has primarily revolved around airborne fungal foliar diseases, such as stem rust, leaf rust and stripe rust, which can be devastating for farmers and their crops. However, the effects of fungi relating to wheat root and crown root were yet to be examined â these diseases affect yields, stands and grain quality due to infections that cause damping-off, blight, necrosis, and dry rotting.
Using plant samples taken during the 2019 growing season, scientists from the International Maize and Wheat Improvement Center (CIMMYT) conducted a quantitative survey to determine the distribution of this fungi. Using morphological and molecular tools on 1,221 samples from 65 sites across the central, eastern, and southeastern region, scientists found that Bipolaris sorokiniana and Fusarium acuminatum were the most predominant fungal species isolated.
In total, 74 isolates from 16 species were tested, revealing that F. culmorum and F. pseudograminearum, B. sorokinaiana, Fusarium sp., R. solani, F. redolens, C. spicifera, C. inaequalis, and N. orvzae were virulent fungi.
Results show the diverse spectrum of pathogenic fungal species linked to wheat crown and root rot in Kazakhstan and is highly likely to be the first report from the country on the presence of F. seudograminearum, Fusarium sp., C. spicifera, and C. inaequalis.
With this new data, scientists can develop mitigations to prevent crop loss and improve wheat yield across Kazakhstan.
Cover photo: The scientists from Turkey researching root and crown rot in Kazakhstani wheat: Abdelfattah A. Dababat (CIMMYT), Mustafa Imren (Bolu Abant Izzet Baysal University), Göksel Ăzer (Bolu Abant Izzet Baysal University) and Rauan Zhapayev. (Photo: Abdelfattah A. Dababat/CIMMYT)
Mustafa Alisarli, Bolu Abant Izzet Baysal University rector, is awarded for hosting this symposium by the representative of the Turkish Ministry of Agriculture and Forestry, General Directorate of Agricultural Research and Policies (GDAR), Dr Suat Kaymak.
The International Maize and Wheat Improvement Center (CIMMYT) coordinated the VIII International Cereal Nematode Symposium between September 26-29, in collaboration with the Turkish Ministry of Agriculture and Forestry, the General Directorate of Agricultural Research and Policies and Bolu Abant Izzet Baysal University.
As many as 828 million people struggle with hunger due to food shortages worldwide, while 345 million are facing acute food insecurity â a crisis underpinning discussions at this symposium in Turkey focused on controlling nematodes and soil-borne pathogens causing reduced wheat yields in semi-arid regions.
A major staple, healthy wheat crops are vital for food security because the grain provides about a fifth of calories and proteins in the human diet worldwide.
Seeking resources to feed a rapidly increasing world population is a key part of tackling global hunger, said Mustafa Alisarli, the rector of Turkeyâs Bolu Abant Izzet Baysal University in his address to the 150 delegates attending the VIII International Cereal Nematode Symposium in the countryâs province of Bolu.
Suat Kaymak, Head of the Plant Protection Department, on behalf of the director general of the General Directorate of Agricultural Research and Policies (GDAR), delivered an opening speech, emphasizing the urgent need to support the CIMMYT Soil-borne Pathogens (SBP) research. He stated that the SBP plays a crucial role in reducing the negative impact of nematodes and pathogens on wheat yield and ultimately improves food security. Therefore, the GDAR is supporting the SBP program by building a central soil-borne pathogens headquarters and a genebank in Ankara.
Discussions during the five-day conference were focused on strategies to improve resilience to the Cereal Cyst Nematodes (Heterodera spp.) and Root Lesion Nematodes (Pratylenchus spp.), which cause root-health degradation, and reduce moisture uptake needed for proper development of wheat.
Richard Smiley, a professor emeritus at Oregon State University, summarized his research on nematode diseases. He has studied nematodes and pathogenic fungi that invade wheat and barley roots in the Pacific Northwest of the United States for 40 years. âThe grain yield gap â actual versus potential yield â in semiarid rainfed agriculture cannot be significantly reduced until water and nutrient uptake constraints caused by nematodes and Fusarium crown rot are overcome,â he said.
Experts also assessed patterns of global distribution, exchanging ideas on ways to boost international collaboration on research to curtail economic losses related to nematode and pathogen infestations.
A special session on soil-borne plant pathogenic fungi drew attention to the broad spectrum of diseases causing root rot, stem rot, crown rot and vascular wilts of wheat.
Soil-borne fungal and nematode parasites co-exist in the same ecological niche in cereal-crop field ecosystems, simultaneously attacking root systems and plant crowns thereby reducing the uptake of nutrients, especially under conditions of soil moisture stress.
Limited genetic and chemical control options exist to curtail the damage and spread of these soil-borne problems which is a challenge exacerbated by both synergistic and antagonistic interactions between nematodes and fungi.
Nematodes, by direct alteration of plant cells and consequent biochemical changes, can predispose wheat to invasion by soil borne pathogens. Some root rotting fungi can increase damage due to nematode parasites.
Integrated managementFor a holistic approach to addressing the challenge, the entire biotic community in the soil must be considered, said Hans Braun, former director of the Global Wheat Program at CIMMYT.
Braun presented efficient cereal breeding as a method for better soil-borne pathogen management. His insights highlighted the complexity of root-health problems across the region, throughout Central Asia, West Asia and North Africa (CWANA).
Richard A. Sikora, Professor emeritus and former Chairman of the Institute of Plant Protection at the University of Bonn, stated that the broad spectrum of nematode and pathogen species causing root-health problems in CWANA requires site-specific approaches for effective crop health management. Sikora added that no single technology will solve the complex root-health problems affecting wheat in the semi-arid regions. To solve all nematode and pathogen problems, all components of integrated management will be needed to improve wheat yields in the climate stressed semi-arid regions of CWANA.
Building on this theme, Timothy Paulitz, research plant pathologist at the United States Department of Agriculture Agricultural Research Service (USDA-ARS), presented on the relationship between soil biodiversity and wheat health and attempts to identify the bacterial and fungal drivers of wheat yield loss. Paulitz, who has researched soil-borne pathogens of wheat for more than 20 years stated that, âWe need to understand how the complex soil biotic ecosystem impacts pathogens, nutrient uptake and efficiency and tolerance to abiotic stresses.â
Julie Nicol, former soil-borne pathologist at CIMMYT, who now coordinates the Germplasm Exchange (CAIGE) project between CIMMYT and the International Center for Agricultural Research in the Dry Areas (ICARDA) at the University of Sydneyâs Plant Breeding Institute, pointed out the power of collaboration and interdisciplinary expertise in both breeding and plant pathology. The CAIGE project clearly demonstrates how valuable sources of multiple soil-borne pathogen resistance in high-yielding adapted wheat backgrounds have been identified by the CIMMYT Turkey program, she said. Validated by Australian pathologists, related information is stored in a database and is available for use by Australian and international breeding communities.
Economic losses
Root-rotting fungi and cereal nematodes are particularly problematic in rainfed systems where post-anthesis drought stress is common. Other disruptive diseases in the same family include dryland crown and the foot rot complex, which are caused mainly by the pathogens Fusarium culmorum and F. pseudograminearum.
The root lesion nematode Pratylenchus thornei can cause yield losses in wheat from 38 to 85 percent in Australia and from 12 to 37 percent in Mexico. In southern Australia, grain losses caused by Pratylenchus neglectus ranged from 16 to 23 percent and from 56 to 74 percent in some areas.
The cereal cyst nematodes (Heterodera spp.) with serious economic consequences for wheat include Heterodera avenae, H. filipjevi and H. latipons. Yield losses due to H. avenae range from 15 to 20 percent in Pakistan, 40 to 92 percent in Saudi Arabia, and 23 to 50 percent in Australia.
In Turkey, Heterodera filipjevi has caused up to 50 percent crop losses in the Central Anatolia Plateau and Heterodera avenae has caused up to 24 percent crop losses in the Eastern Mediterranean.
The genus Fusarium which includes more than a hundred species, is a globally recognized plant pathogenic fungal complex that causes significant damage to wheat on a global scale.
In wheat, Fusarium spp. cause crown-, foot-, and root- rot as well as head blight. Yield losses from Fusarium crown-rot have been as high as 35 percent in the Pacific Northwest of America and 25 to 58 percent in Australia, adding up losses annually of $13 million and $400 million respectively, due to reduced grain yield and quality. The true extent of damage in CWANA needs to be determined.
Abdelfattah Dababat, CIMMYTâs Turkey representative and leader of the soil-borne pathogens research team said, âThere are examples internationally, where plant pathologists, plant breeders and agronomists have worked collaboratively and successfully developed control strategies to limit the impact of soil borne pathogens on wheat.â He mentioned the example of the development and widespread deployment of cereal cyst nematode resistant cereals in Australia that has led to innovative approaches and long-term control of this devastating pathogen.
Dababat, who coordinated the symposium for CIMMYT, explained that, âThrough this symposium, scientists had the opportunity to present their research results and to develop collaborations to facilitate the development of on-farm strategies for control of these intractable soil borne pathogens in their countries.â
Paulitz stated further that soil-borne diseases have world-wide impacts even in higher input wheat systems of the United States. âThe germplasm provided by CIMMYT and other international collaborators is critical for breeding programs in the Pacific Northwest, as these diseases cannot be managed by chemical or cultural techniques,â he added.
Closing ceremony of the International Cereal Nematode Symposium. From left to right; Hans Braun, Brigitte Slaats, Richard Sikora, Grant Hollaway, Mesut Keser, Zahra Maafi, Richard Smiley, Mustafa Imren, Fatih Ozdemir, Amer Dababat. (Photo: CIMMYT)
Road ahead
Delegates gained a greater understanding of the scale of distribution of cereal cyst nematodes and soil borne pathogens in wheat production systems throughout West Asia, North Africa, parts of Central Asia, Northern India, and China.
After more than 20 years of study, researchers have recognized the benefits of planting wheat varieties that are more resistant. This means placing major emphasis on host resistance through validation and integration of resistant sources using traditional and molecular methods by incorporating them into wheat germplasm for global wheat production systems, particularly those dependent on rainfed or supplementary irrigation systems.
Sikora stated that more has to be done to improve Integrated Pest Management (IPM), taking into consideration all tools wherever resistant is not available. Crop rotations for example have shown some promise in helping to mitigate the spread and impact of these diseases.
âIn order to develop new disease-resistant products featuring resilience to changing environmental stress factors and higher nutritional values, modern biotechnology interventions have also been explored,â Alisarli said.
Brigitte Slaats and Matthias Gaberthueel, who represent Swiss agrichemicals and seeds group Syngenta, introduced TYMIRIUMÂź technology, a new solution for nematode and crown rot management in cereals. âSyngenta is committed to developing novel seed-applied solutions to effectively control early soil borne diseases and pests,â Slaats said.
It was widely recognized at the event that providing training for scientists from the Global North and South is critical. Turkey, Austria, China, Morocco, and India have all hosted workshops, which were effective in identifying the global status of the problem of cereal nematodes and forming networks and partnerships to continue working on these challenges.
Farmers gather in a landrace field. Photo: Raqib Lodin/CIMMYT
For thousands of years, farmers in Afghanistan, Turkey and other countries in the region, have been breeding wheat, working closely with the environment to develop traditional wheat varieties known as landraces. Untouched by scientific breeding, landraces were uniquely adapted to their environment and highly nutritious.
As agriculture became more modernised and intensified, it threatened to push these traditional landraces into extinction, resulting in the loss of valuable genetic diversity. Institutions around the world decided to act, forming germplasm collections known as genebanks to safely house these landraces.
In 2009, a team of wheat scientists from the International Maize and Wheat Improvement Center (CIMMYT), the International Center for Agricultural Research in the Dry Areas (ICARDA), the UN Food and Agriculture Organization (FAO), and national partners set off on a five-year expedition across Central Asia to collect as many landraces as they could find. The project, led by FAO Cereal Breeder and former CIMMYT Principal Scientist Alexey Morgunov, was made possible by the International Treaty on Plant Genetic Resources for Food and Agriculture Benefit-Sharing Fund.
The project had two main missions. The first is to preserve landrace cultivation in three countries, Afghanistan, Turkey and other countries in the region by selecting, purifying, and multiplying the landraces and giving them back to farmers. The second is to scientifically evaluate, characterize and use these landrace varieties in ongoing breeding programmes, exchange the information between the countries, and to deposit the seeds in genebanks to safely preserve them for future generations.
The latest results from the project were published in July in the journal Crops. The study, authored by a team of experts from CIMMYT, ICARDA, FAO, and research institutes in Afghanistan, Turkey and other countries in the region, compared the diversity, performance, and adaptation of the collected wheat landraces with modern varieties grown in the regions using a series of field experiments and cutting-edge genomic tools.
âLandraces are very useful from a breeding perspective because they have been cultivated by farmers over thousands of years and are well adapted to climate change, have strong resistance to abiotic stresses and have very good nutritional quality,â said Rajiv Sharma, a CIMMYT senior scientist and co-author of the paper.
âWe were interested in seeing how well landraces adapt to certain environments, how they perform agronomically, and whether they are more diverse than modern varieties grown in these regions â as well as give their improved versions back to farmers before they are lost.â
The experiments, which were carried out in 2018 and 2019 in Turkey, and 2019 in Afghanistan, and other countries in the region revealed several physical characteristics in landraces which are no longer present in modern varieties. For example, the team found striking differences in spike and grain colors with landraces more likely to have red spikes and white grains, and modern varieties tending to have white spikes and red grains. This may have adaptive values for high altitudes and dry conditions.
A surprising finding from the study, however, was that landraces were not more genetically diverse than modern landraces.
âMany people thought that when we went from cultivating landraces to modern varieties, we lost a lot of diversity but genetically speaking, thatâs not true. When you look at the genomic profile, modern varieties are just as diverse as landraces, maybe even a little bit more so,â said Sharma.
When the team compared landraces and modern varieties on crop performance, the results were mixed with modern wheat varieties outyielding landraces in half of the environments tested. However, they found that the highest yielding landraces were just as good as the best modern varieties â a reassuring finding for farmers concerned about the productivity of their crops.
A new breeding paradigm Â
The results of the study have important implications for landrace conservation efforts in farmersâ fields and in future breeding strategies. While crossing wheat landraces with modern varieties to develop improved modern varieties is not new, the authors proposed a novel alternative breeding strategy to encourage the continued cultivation of landraces: improving landraces by crossing them with other landraces.
âIn order to maintain landraces, we have to make them competitive and satisfy farmersâ needs and requirements. One option is that we breed landraces,â said Sharma.
âFor example, you might have a landrace that is very-high yielding but susceptible to disease. By crossing this variety with another landrace with disease-resistant traits you can develop a new landrace better suited to the farmer and the environment. This approach maintains all the features of landraces â we are simply accelerating the evolution process for farmers to replace the very fast disappearance of these traditional varieties.â
This approach has already been used by crop scientists at the University of California, Davis who has successfully developed and registered âheirloom-like varietiesâ of dry beans. The varieties trace about 98% of their ancestry to landraces but are resistant to the common mosaic virus.
Heirloom food products are becoming increasingly popular with health-conscious consumers who are willing to pay a higher price for the products, garnering even more interest in conserving traditional landraces.
One of the overarching aims of the project was to give wheat landraces back to farmers and let nature take its course. Throughout the mission, the team multiplied and returned landrace seed to over 1500 farmers in communities across Afghanistan, Turkey and other countries in the region. The team also supplied over 500 farmers with improved landrace seed between 2018 and 2019.
Despite the political turmoil facing these countries, particularly Afghanistan, farmers are still growing wheat and the projectâs contribution to food security will continue.
These landraces will take their place once more in the farming landscape, ensuring on-farm wheat diversity and food security for future generations.
This research was conducted with the financial assistance of the European Union within the framework of the Benefit-Sharing Fund project âW2B-PR-41-TURKEYâ of the FAOâs International Treaty on Plant Genetic Resources for Food and Agriculture.
Empty shelfs in a Swiss grocery store. Photo Boris Dunand/Unsplash
The conflict in Ukraine has had a deeply destabilizing effect on the global wheat trade, causing unprecedented price volatility and uncertainty. As my colleagues and I have previously highlighted, the unintended consequences are likely to have outsized impacts on livelihoods in the Global South.
As the G7 group of nations recently acknowledged in a joint statement, the conflict is leading to steep price rises and increasing global food insecurity for millions, especially those most vulnerable, such as women and children.
In a new paper published in Nature Food, scientists and partners of the International Maize and Wheat Improvement Center (CIMMYT) present a package of applied solutions to respond to the crisis and ensure future wheat stability.
To stem the potential food crisis, food is needed in more places, and faster.
Recently announced talks between Russia, Turkey, Ukraine and the United Nations, among other negotiations, are already underway as part of this international effort to develop short-term solutions.
However, at present we are seeing the brakes applied in several places. For example, in India century-high temperature extremes have recently reduced official wheat production estimates by 6 percent, leading to reduced export potential. This shows the compounding effect of climatic instability on global wheat markets, an impact that is expected to worsen over time.
In our solutions agenda, we propose a package of short-, medium- and longer-term actions and urge immediate and sustained support for shockproofing major food security staple crops, including wheat.
In the short term, the priority is mitigation of food security shocks through boosting production in existing high- and low-productivity areas, ensuring access to grain, and making use of flour substitution.
In the medium term, we must increase the local, regional, and global resilience of wheat supply through targeted expansion (within agro-ecological boundaries), support for self-sufficiency, comprehensive technical support in production systems, and mainstreamed crop monitoring capacity.
In the longer term, the transition to agri-food system resilience will need to encompass agroecosystem diversity, address gender disparities in agriculture and rural communities, and sustain an increased investment in a holistic, agri-food transition.
Conflict is being waged on wheat on multiple fronts: on battlefields, in the political arena and by our changing climate. Together these factors interact and amplify the threat to staple wheat production. To address this complexity, we now need to move beyond defining the problem to implementing practical action to ensure stable supply.
In nature, plants are simultaneously exposed to a complex system of biotic and abiotic stresses that limit crop yield. The cereal cyst nematode Heterodera filipjevi and dryland crown rot, caused by Fusarium, are important diseases facing cereal production around the world that cause significant yield loss. Yield loss accelerates when those diseases coexist with other abiotic stresses, such as drought.
Hexaploid bread wheat (Triticum aestivum L.) is an essential staple food for a large part of the worldâs population, covering around 20% of daily caloric intake in the human diet, with global production at about 670.8 million tons per year, produced over 215.4 million hectares of land worldwide. Therefore, the program studying soil-borne pathogens at the International Maize and Wheat Improvement Center (CIMMYT)âs Turkey office initiated a study to investigate the effect of soil borne diseases (H. filipjevi and Fusarium culmorum) individually and in combination with drought on some morphological and physiological traits in wheat germplasm with different genetic tolerances to the three studied factors.
In this study, yield components included thousand kernel weight, spike weight, seed per spike and total grain yield. Morphological parameters, including plant height, final plant number (seedling emergence), relative water content, leaf chlorophyll content, H. filipjevi cyst number and presence of crown rot, were studied under greenhouse conditions in Turkey.
The main findings of the study showed that the interaction among water stress, F. culmorum and H. filipjevi increased the damage on the wheat parameters studied when compared with each stress applied alone. One of the most significant damages was seen in high seedling mortality under the three combined stresses (56% seedling death rate), which indicates the damage on wheat yield might occur at the seedling stage rather than later stages. This reduces plant density per area, which was ultimately responsible for low grain yield produced. The known dryland disease, crown rot, caused by F. culmorum, was significantly pronounced under water-stressed conditions.
In all studied parameters, the lowest damage was found among the resistant cultivars to biotic or abiotic stresses. This underscores the importance of wheat breeding programs to develop resistant germplasm, and reminds farmers to replace their old, susceptible varieties with new, resistant ones.
Based on our intensive experience in the CWANA region, most wheat growers basically do not recognize soil borne pathogens as a problem. In fact, most of them do not know that what nematode or soil fungal species are in their fields affecting yield. The term âhidden enemyâ perfectly applies to the problems in the region and beyond. Integrated pest management (IPM) is, however, not practiced in the entire region and soil borne pathogen-induced yield losses are simply accepted.
We can conclude from this study that yield reduction in wheat due to soil borne pathogens could be lessened by improving and understanding the concept of IPM in the region where the practice of winter mono-culturing of wheat is the norm. Management of cereal soil-borne pathogens, especially cereal cyst nematode and crown rot, could involve an integrated approach that includes crop rotation, genetic resistance, crop nutrition and appropriate water supply.
Cover photo: Four different test crops show different stresses: T1V8 = Drought, T2V8 = Drought and Nematodes, T3V8 = Drought and fungus, T4V8 = Drought and nematode and fungus together. (Credit: CIMMYT)
Two new students have graduated from the International Maize and Wheat Improvement Centerâs (CIMMYTâs) Soil-Borne Pathogens program. The two new graduates, Khawla Mehalaine and Salah-Eddine Laasli, were supervised by CIMMYT senior scientist Abdelfattah Dababat.
He leads the Soil-Borne Pathogens program, which focuses on identifying the main soil-borne pathogens associated with cereals and developing an integrated pest management approach to combat them. The research team is particularly interested in finding novel sources of resistance against these pathogens.
Over the last two decades, CIMMYT scientists leading the Soil-Borne Pathogens program have trained tens of students which constitute the next generation of top researchers on this topic. Through this program, CIMMYT has also organized workshops and courses in North Africa, including a symposium on cereal nematodes held in Agadir, Morocco, in 2017.
Since soil-borne pathogens are exacerbated by water stress conditions, researchers have identified the Central and West Asia and North Africa regions as priority areas, due to their vulnerability to drought.
On March 1, 2021, Syngenta, in collaboration with CIMMYT and other partners, led the first One Earth Soil and Root Health Forum, an event which examined the importance of root and soil health to food security, climate resilience and livelihoods. The event also created a community for action on root and soil health.
Khawla Mehalaine celebrates graduating from her PhD. (Photo: handout)
Nematodes in Algeria
Mehalaine holds an engineering degree in agronomy and a master’s degree in plant protection from the Higher National School of Agronomy (ENSA) in Algeria. She successfully defended her PhD dissertation âStudies of cereal cyst nematodes of the genus Heterodera in the regions of northern Algeriaâ in June 2021, graduating from ENSA with honors.
She studied the behavior of four durum wheat varieties against cereal cyst nematodes through field surveys, molecular identification at species levels, and by evaluating the yield components of these wheat varieties.
She was promoted by ENSA professor Hammach M. and supervised by Dababat from CIMMYT, and professors Mustafa Imren and GoÌksel OÌzer from Abant Izzet Baysal University in Turkey.
âCompleting my doctorate was a truly enriching experience and a challenging but rewarding journey,â Mehalaine said. âIt was a collective effort and I am extremely grateful to Dr Abdelfattah Dababat for sharing his scientific skills, for his patience and support, and for all the opportunities I was given to further my research. Thanks to him, I got to know the world of nematodes. Special thanks to CIMMYT for funding the molecular study part.â
Salah-Eddine Laasli on his graduation day. (Photo: handout)
Root-lesion nematode and crown rot fungi
Laasli graduated with an International Master of Agronomic and Environmental Nematology (IMANEMA) from Ghent University, in collaboration with CIMMYT, the National Institute of Agricultural Research in Morocco and the Faculty of Agriculture at Abant Izzet Baysal University in Turkey.
His master thesis, entitled âInteraction of Root-Lesion Nematode (Pratylenchus thornei) and Crown Rot fungi (Fusarium culmorum) associated with wheat resistance under simulated field conditions,â was promoted by Wim Bert, a professor at the University of Ghent, and Dababat. The project was also supervised by Imren and OÌzer.
Laasli evaluated the host status of 150 spring wheat lines to both P. thornei and F. culmorum, and estimated the damage caused by the disease complex involving both pathogens at different infection scenarios. He found several lines that possessed multiple resistance to both diseases tested â which could be powerful sources of resistance for breeding program worldwide.
Cover photo: Irrigated wheat field. (Photo: S. Sukumaran/CIMMYT)
Wheat stalks grow in a field in India. (Photo: Saad Akhtar)
For scientists, determining how best to increase wheat yields to meet food demand is a persistent challenge, particularly as the trend toward sustainably intensifying production on agricultural lands grows.
The United Nations projects that the current global population of 7.6 billion will increase to more than 9.8 billion by 2050, making higher grain yield potential vital, particularly as climate instability increases due to global warming. International efforts are also focused on meeting the Zero Hunger target detailed in the UN Sustainable Development Goals before they expire in 2030.
Now, a new landmark research survey on the grain yield potential and climate-resilience of bread wheat (Triticum aestivum L.) has brought scientists a few strides closer to meeting their ambitions.
Grain yield has traditionally been an elusive trait in genomic wheat breeding because of its quantitative genetic control, which means that it is controlled by many genomic regions with small effects.
Challenges also include a lack of good understanding about the genetic basis of grain yield, inconsistent grain yield quantitative trait loci identified in different environments, low heritability of grain yield across environments and environment interactions of grain yield.
To dissect the genetic architecture of wheat grain yield for the purposes of the research, which appeared in Scientific Reports, researchers implemented a large-scale genome-wide association study based on 100 datasets and 105,000 grain yield observations from 55,568 wheat breeding lines developed by the International Maize and Wheat Improvement Center (CIMMYT).
They evaluated the lines between 2003 and 2019 in different sites, years, planting systems, irrigation systems and abiotic stresses at CIMMYTâs primary yield testing site, the Norman E. Borlaug Experimental Research Station, Ciudad Obregon, Mexico, and in an additional eight countries â including Afghanistan, India and Myanmar â through partnerships with national programs.
The researchers also generated the grain-yield associated marker profiles and analyzed the grain-yield favorable allele frequencies for a large panel of 73,142 wheat lines, resulting in 44.5 million data points. The marker profiles indicated that the CIMMYT global wheat germplasm is rich in grain yield favorable alleles and is a trove for breeders to choose parents and design strategic crosses based on complementary grain yield alleles at desired loci.
âBy dissecting the genetic basis of the elusive grain-yield trait, the resources presented in our study provide great opportunities to accelerate genomic breeding for high-yielding and climate-resilient wheat varieties, which is a major objective of the Accelerating Genetic Gain in Maize and Wheat project,â said CIMMYT wheat breeder Philomin Juliana.
âThis study is unique and the largest-of-its-kind focusing on elucidating the genetic architecture of wheat grain yield,â she explained, âa highly complex and economically important trait that will have great implications on future diagnostic marker development, gene discovery, marker-assisted selection and genomic-breeding in wheat.â
Currently, crop breeding methods and agronomic management put annual productivity increases at 1.2% a year, but to ensure food security for future generations, productivity should be at 2.4% a year.
So, the extensive datasets and results presented in this study are expected to provide a framework for breeders to design effective strategies for mitigating the effects of climate change, while ensuring food-sustainability and security.
Soil is the foundation of agriculture, and healthy soil is critical to the entire ecosystem. However, soil health is under threat today as many factors make soil unhealthy, leading to significant losses in farming. CIMMYT in India has been addressing these issues in partnership with national and international institutions, while CIMMYTâs SBP program in TĂŒrkiye aims to deliver high-yielding wheat germplasm that is resistant to SBP and supports the International Soil-Borne Pathogens Research & Development Center (ISBPRDC) of TĂŒrkiye. It also facilitates knowledge exchange and technology transfer to support joint research and development activities to improve soil health.
Participants later visited winter wheat trial sites at the research station in Haymana, a district of Ankara province. The group then interacted with Mesut Keser, ICARDAâs wheat breeder who specializes in winter and facultative wheat while working on the International Winter Wheat Improvement Program (IWWIP). This was followed by a visit to the pathology field experiments, a breeder seed production area, and an experimental trial for evaluating Syngenta TYMIRIUMÂź technology at the research station.
Beyhan Akin, wheat breeder at CIMMYT, gave a presentation on CIMMYT’s breeding activities in TĂŒrkiye, and OÄuz Ănder presented fertilizer application on the quality of Bread Wheat and the importance of foliar fertilization in crops.
