Source: Agricultural Research Service
New cultivars of common bean have been developed by Agricultural Research Service (ARS) scientists to shore up the legume crop's defenses against the fungal disease common bean rust.
According to Talo Pastor-Corrales, an Agricultural Research Service (ARS) plant pathologist in Beltsville, Md., the new cultivars possess two or more genes for resistance to the rust fungi. Most of the cultivars also harbor Ur-11, which is considered the most effective rust-resistance gene in the world.
Pastor-Corrales and his colleagues at the University of Nebraska and Colorado State University resorted to this multi-gene strategy in response to the high diversity of strains of the bean rust pathogen. Lately, virulent new races of rust that have overcome the Ur-3 resistance gene appeared in Michigan and North Dakota.