Posts Tagged ‘Wheat Germplasm Bank’

Genome-wide association mapping finds narrow but high level of wheat blast resistance in CIMMYT’s international nurseries

By Madeline Dahm

Wheat spikes damaged by blast. Photo: Xinyao He, CIMMYT

Wheat blast, caused by the fungus Magnaporthe oryzae pathotype Triticum, was first identified in 1985 in South America, but has been seen in Bangladesh in recent years. The expansion of the disease is a great concern for regions of similar environmental conditions in South Asia, and other regions globally.

Although management of the disease using fungicide is possible, it is not completely effective for multiple reasons, including inefficiency during high disease pressure, resistance of the fungal populations to some classes of fungicides, and the affordability of fungicide to resource-poor farmers. Scientists see the development and deployment of wheat with genetic resistance to blast as the most sustainable and farmer-friendly approach to preventing devastating outbreaks around the world.

In an article published in Nature Scientific Reports, a team of scientists from the International Maize and Wheat Improvement Center (CIMMYT) and partners, led by CIMMYT associate scientist Philomin Juliana, conducted a large genome-wide association study to look for genomic regions that could also be associated with resistance to wheat blast.

Using data collected over the last two years on CIMMYT’s International Bread Wheat Screening Nurseries (IBWSNs) and Semi-Arid Wheat Screening Nurseries (SAWSNs) by collaborators at the Bangladesh Wheat and Maize Research Institute (BWMRI) and the Instituto Nacional de Innovación Agropecuaria y Forestal (INIAF) in Bolivia, Philomin and fellow scientists found 36 significant markers on chromosome 2AS, 3BL, 4AL and 7BL that appeared to be consistently associated with blast resistance across different environments. Among these, 20 markers were found to be in the position of the 2NS translocation, a chromosomal segment transferred to wheat from a wild relative, Aegilops ventricosa, that has very strong and effective resistance to wheat blast.

The team also gained excellent insights into the blast resistance of the globally-distributed CIMMYT germplasm by genomic fingerprinting a panel over 4000 wheat lines for the presence of the 2NS translocation, and found that it was present in 94.1% of lines from IBWSN and 93.7% of lines from SAWSN.  Although it is reassuring that such a high percentage of CIMMYT wheat lines already have the 2NS translocation and implied blast resistance, finding other novel resistance genes will be instrumental in building widespread, global resilience to wheat blast outbreaks in the long-term.

Read the publication by Philomin Juliana, Xinyao He, Muhammad R. Kabir, Krishna K. Roy, Md. Babul Anwar, Felix Marza, Jesse Poland, Sandesh Shrestha, Ravi P. Singh, and Pawan K. Singh

This work was made possible by the generous support of the Delivering Genetic Gains in Wheat (DGGW) project funded by the Bill & Melinda Gates Foundation, the U.K. Foreign, Commonwealth & Development Office (FCDO) and managed by Cornell University, the U.S. Agency for International Development’s Feed the Future initiative, the CGIAR Research Program on Wheat (WHEAT), the Indian Council of Agricultural Research (ICAR), The Swedish Research Council (Vetenskapsråd), and the Australian Centre for International Agricultural Research (ACIAR), #CIM/2016/219.

Head of CIMMYT Wheat Germplasm Bank honored at gathering of crop science peers

Thomas Payne delivering a presentation at the Frank N. Meyer Medal for Plant Genetic Resources Breakfast. Photo credit: Kevin Pixley/CIMMYT

Thomas Payne, head of the Wheat Germplasm Bank at the International Maize and Wheat Improvement Center (CIMMYT), was awarded the Frank N. Meyer Medal for Plant Genetic Resources this morning at the annual meeting of the American Society of Agronomy, the Crop Science Society of America, and the Soil Science Society of America in San Antonio, Texas.

The Frank N. Meyer Medal recognizes contributions to plant germplasm collection and use, as well as dedication and service to humanity through the collection, evaluation or conservation of earth’s genetic resources. The award was presented by Clare Clarice Coyne, U.S. Department of Agriculture (USDA) research geneticist.

As an award recipient, Thomas Payne delivered a lecture that touched on the philosophy, history and culture surrounding plant genetic diversity and its collectors, and CIMMYT’s important role in conserving and sharing crop diversity.

CIMMYT scientist Alexey Morgunov, Thomas Payne’s sister Susan Payne, Thomas Payne. Photo credit: Kevin Pixley/CIMMYT

Thomas Payne has focused his career on wheat improvement and conservation. In addition to leading CIMMYT’s Wellhausen-Anderson Wheat Genetic Resources Collection, one of the world’s largest collection of wheat and maize germplasm, he manages the CIMMYT International Wheat Improvement Network.  He is the current Chair of the Article 15 Group of CGIAR Genebank Managers, and has served as Secretary to the CIMMYT Board of Trustees.  His association with CIMMYT began immediately after obtaining a PhD at the University of Nebraska-Lincoln in 1988, and he has held positions for CIMMYT in Ethiopia, Mexico, Syria, Turkey and Zimbabwe. 

“CIMMYT is the largest distributor of maize and wheat germplasm worldwide, with materials emanating from its research and breeding programs, as well as held in-trust in the germplasm bank.  The Meyer Medal is a reflection of the impact CIMMYT makes in the international research community —  and in farmers’ fields throughout the developing world,” he said.

Located at CIMMYT headquarters outside Mexico City, the CIMMYT Wheat Germplasm Bank contains nearly 150,000 collections of seed of wheat and related species from more than 100 countries. The collections preserve the diversity of unique native varieties and wild relatives of wheat and are held under long-term storage for the benefit of humanity, in accordance with the 2007 International Treaty on Plant Genetic Resources for Food and Agriculture. They are also studied and used as a source of diversity to breed for crucial traits such as heat and drought tolerance, resistance to crop diseases and pests, grain yield productivity and grain quality. Seed is freely shared on request to researchers, students, and academic and development institutions worldwide.

The Frank N. Meyer Medal for  Plant Genetic Resources. Photo credit: Kevin Pixley/CIMMYT

In his remarks, Thomas Payne also highlighted the story of Frank N. Meyer, for whom the award is named. Meyer, an agricultural explorer for the USDA in the 1900s, spent a decade traveling under harsh conditions through China to collect new plant species suitable for production on America’s expanding farmland. Among more than 2,500 plants that he introduced to the U.S. — including varieties of soybeans, oats, wild pears, and asparagus — the Meyer lemon was named in his honor. As Payne pointed out, Meyer worked during a historical period of great scientific discoveries, including those by his contemporaries Marie Curie and the Wright brothers.

Thomas Payne with CIMMYT Director of Genetic Resources Kevin Pixley
Thomas Payne with Head of CIMMYT Maize Germplasm Bank Denise Costich. Photo credit: Kevin Pixley/CIMMYT

Among those attending the ceremony were Thomas Payne’s sister, Susan Payne and CIMMYT colleagues Kevin Pixley, director of Genetic Resources; Denise Costich, head of the CIMMYT Maize Germplasm Bank; and Alexey Morgunov, head of the Turkey-based International Winter Wheat Improvement Program.

The head of CIMMYT’s Global Wheat Program Hans-Joachim Braun and CIMMYT scientist Alexey Morgunov are also receiving honors or awards this week at the annual meeting of the American Society of Agronomy, the Crop Science Society of America, and the Soil Science Society of America. The meeting convenes around 4,000 scientists, professionals, educators, and students to share knowledge and recognition of achievements in the field.