Author
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Stavely, J |
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Submitted to: American Phytopathological Society Abstracts
Publication Type: Abstract Only Publication Acceptance Date: 5/17/1999 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Ninety pathogenic races of the bean rust pathogen, Uromyces appendiculatus, have been identified and maintained at Beltsville. Rust causes major crop losses in Phaseolus vulgaris beans. Monogenic dominant resistance genes, designated Ur-3, Ur-4, Ur-6, and Ur-11 are effective against 44, 30, 22, and 89 rust races, respectively, and Ur-3 or -4 with Ur-11 control all 90 races. Bean common mosaic (BCMV) and bean common mosaic necrosis (BCMN) viruses are also major highly variable pathogens. A dominant gene, I, controls all strains of BCMV and a series of recessive genes control many BCMV strains. The bc-1**2 and bc-3 genes control all strains of both viruses when combined with I or bc-u. Many lines of all commercial classes of common beans are pedigree bred and selected for homozygosity of resistance genes at Beltsville, then field selected for optimal yield, plant and product quality in appropriate production states. Market, bush snap beans BeltGlade- RR-1,-2, and -3 with Ur-4, Ur-11; and I; pinto BelDakMi-RMR-14 with I, bc-3, Ur-6, and Ur-11 recombined with repulsion linked Ur-3; and great northern BelMiNeb-RMR-4 and -5 with Ur-4, Ur-6, Ur-11, I, and bc-1**2 were released in 1998. |