The Agricultural Research Service (ARS) of the U.S. Department of Agriculture said it has identified a number of stem rust-resistant wheat varieties and was retesting them to verify their resistance.
USDA scientists at the ARS Small Grains Research Unit in Aberdeen, Idaho screened more than 3,000 wheat landraces from the National Small Grains Collection against new races of the stem rust pathogen found in Kenyan wheat fields. Landraces with confirmed resistance were crossed with susceptible wheat to determine the genetic basis of the resistance.
The researchers’ goal was to find new genes for resistance to UG99, a rust strain that has the capacity to overcome many of the resistant genes used in the past 50 years. The work will help African growers now and will help suppress disease and reduce damage in developing countries, as well as prepare for the potential arrival of Ug99 in the United States.