Sentences with phrase «of stem rust»

Concern about yellow rust has languished as wheat scientists rushed to respond to a related disease, the Ug99 strain of stem rust against which little of the world's wheat has any resistance.

The vulnerability of wheat in Africa and Asia to the Ug99 race of the stem rust pathogen led to a large scale effort to cover approximately 5 % of the area sown to wheat in six countries (Afghanistan, Bangladesh, Egypt, Ethiopia, Nepal and Pakistan) to ensure sufficient seed of resistant varieties to displace current popular varieties.

Since 2011, GRRC also accepted samples of stem rust (Puccinia graminis tritici) as agreed upon with the Borlaug Global Rust Initiative and the phase II of the Durable Rust Resistance in Wheat Project (DRRW) and now continued in the Delivering Genetic Gain in Wheat project (DGGW), 2016 - 2020.

Three epidemics of stem rust from 1939 - 1941 destroyed wheat crops in the Yaqui Valley of Mexico.

The research, published today in the journal Nature Plants, quantifies for the first time the circumstances — routes, timings and outbreak sizes — under which dangerous strains of stem rust pose a threat from long - distance dispersal out of East Africa to the large wheat - producing areas in India and Pakistan.

A gene isolated from one of the earliest cultivated wheat species, Einkorn wheat (Triticum monococcum), confers resistance to a deadly version of stem rust, scientists report June 27 in Science.

In 1999 a new, highly - virulent strain of the stem rust fungus emerged in eastern Africa.

However, the continued emergence of stem rust variants that overcome new resistance genes, now demands an increased focus on pathogen evolution and virulence mechanisms.

Scientists worldwide joined forces in the early 2000s to develop new, resistant varieties and to monitor and control outbreaks of stem rust and yellow rust, as part of collaborations such as the Borlaug Global Rust Initiative led by Cornell University.

Next, researchers isolated the candidate gene and used biotechnical approaches to develop transgenic plants that carried the Sr35 gene and showed resistance to the Ug99 race of stem rust.

We have just upgraded our rust quarantine greenhouse and lab facilities, so we are ready to receive samples of both stem rust and yellow rust for diagnosis of race in a secure environment, and we also look forward to assist in training of students and young scientists from all over the world in wheat rust pathology

The environmental constraints are predictable, said Hussein: water scarcity, high heat, poor soil fertility and diseases like the Ug99 strain of stem rust that was first discovered in neighboring Uganda.

The emergence of the Ug99 race of stem rust in Africa and the Middle East together with the appearance of new strains in Europe catalyzed a major effort to identify new sources of stem rust resistance and breed these genes into wheat lines.