Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 9/1/1998
Publication Date: N/A
Technical Abstract: In the last 20 years, 89 pathogenic races of the bean rust fungus, Uromyces appendiculatus, have been isolated, identified, and maintained from field collections from many bean production areas. Many sources of resistance to various of these races have been identified and some key resistance genes have been designated as Ur-3, Ur-4, Ur-6, and Ur-11 that are effective against 44, 30 22, and 88 of these races, respectively. Two of these genes Ur-3 and Ur-11 were linked in repulsion, but have been combined. By appropriate hybridizations, greenhouse testing with key races, and employment of polymerase chain reaction primer-generated markers of certain of these genes, pinto and great northern bean germplasm lines are being obtained that contain all four of these rust resistance genes to provide resistance to all 89 races and two or more genes for resistance to most races. Using similar methodology, these lines also contain the bc-3 and I genes providing resistance to all 23 pathogenic strains of bean common mosaic and bean common mosaic necrosis viruses.