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Tag: leaf rust

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

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

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

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

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

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

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

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

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

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

Winner of BGRI Gene Stewardship Award announced

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

  • Héctor Eduardo Villaseñor Mir (cereal breeder)
  • René Hortelano Santa Rosa (cereal breeder)
  • Eliel Martínez Cruz, (cereal chemist)
  • María Florencia Rodríguez García (cereal pathologist)
  • Ernesto Solís Moya (wheat breeder)
  • Jorge Iván Alvarado Padilla (wheat breeder)

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

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

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

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

BGRI Technical Workshop

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

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

Afghan wheat landrace shows promise for rust resistance

Rust pathogens are the most ubiquitous fungal pathogens that continue to pose a serious threat to wheat production. The preferred strategy to combat these diseases is through breeding wheat varieties with genetic resistance.

Landraces are a treasure trove of trait diversity, offer an excellent choice for the incorporation of new traits into breeding germplasm, and serve as a reservoir of genetic variations that can be used to mitigate current and future food challenges. Improving selection efficiency can be achieved through broadening the genetic base through using germplasm pool with trait diversity derived from landraces.

In a recent study, researchers from the International Maize and Wheat Improvement Center (CIMMYT) used Afghan landrace KU3067 to unravel the genetic basis of resistance against Mexican races of leaf rust and stripe rust. The findings of this study not only showcase new genomic regions for rust resistance, but also are the first report of Lr67/Yr46 in landraces. This adult plant resistance (APR) gene confirms multi-pathogenic resistance to three rust diseases and to powdery mildew.

Using genotype sequencing and phenotyping, the authors also report an all-stage resistance gene for stripe rust on chromosome 7BL, temporarily designated as YrKU. The genetic dissection identified a total of six quantitative trait locus (QTL) conferring APR to leaf rust, and a further four QTL for stripe rust resistance.

Although use of landraces in wheat breeding has been practiced for a long time, it has been on a limited scale. This study represents a significant impact in breeding for biotic stresses, particularly in pest and disease resistance.

Read the full study here: Identification and Characterization of Resistance Loci to Wheat Leaf Rust and Stripe Rust in Afghan Landrace “KU3067”

Cover photo: Yellow rust screening takes place at a CIMMYT experimental station in Mexico. (Credit: Sridhar Bhavani/CIMMYT)

Stripe rust hits wheat crop in Nepal

Nepalese and CIMMYT wheat scientists, working at the Nepal Agricultural Research Council (NARC) and the International Maize and Wheat Improvement Centre (CIMMYT) suspect new races of stripe and leaf rust infected the wheat crop in the Nepal hills and terai in the recent 2020 wheat season. This was reported after detailed survey and surveillance activities of rust diseases in the terai and hill regions were carried out during March and April, before the COVID-19 pandemic forced the cessation of many field activities.

Read more here: https://www.seedquest.com/news.php?type=news&id_article=117729&id_region=&id_category=&id_crop=