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ARS Home » Research » Publications at this Location » Publication #75012
Title: PROPOSED SYMBOLS FOR RUST RESISTANCE GENES

Author
item KELLY, J - MI STATE UNIV., MI
item Stavely, J
item MIKLAS, P - USDA, PROSSER, WA

Submitted to: Bean Improvement Cooperative Annual Report
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/19/1996
Publication Date: N/A
Citation: N/A

Interpretive Summary: Epidemics caused by the bean rust fungus cause serious losses in snap and dry bean production, losses to farmers, market instability, and consumer price increases. A few fungicides control bean rust, but host resistance is economically and environmentally preferable. The great variability of the rust pathogen makes resistance that will remain effective over time and distance difficult to achieve. In recent years numerous rust resistance genes that are effective against many, most, or all races have been identified by various researchers in different locations. The need to logically, simply, scientifically, and uniformly organize and name these genes has become essential to facilitate combination of multiple genes into germplasm and cultivars to better protect against new pathogenic variants. Information on bean rust resistance genes is compiled and organized here, and uniform logical naming is applied to these genes. This compilation and naming of bean rust host resistance genes will facilitate development of rust resistant bean cultivars that will remain resistant to potential variability in the fungus to improve bean production efficiency, market stability, and food supply dependability, and to reduce need for fungicides, which will benefit bean producers and consumers.

Technical Abstract: A system of nomenclature is proposed for genes conferring host resistance to bean rust, caused by Uromyces appendiculatus var. appendiculatus. All bean rust resistance genes will have the symbol Ur. The Ur-1, Ur-2, and Ur-3 designations that were previously published will be retained. A gene in cultivar Early Gallatin is renamed from the originally published Up2 to Ur-4. Other renamed genes are Up, UrA through UrH, Ur-a, RB11, Ur-p, and URPR1 that will be Ur-8, Ur-5, Ur-6, Ur-7, Ur-9, and Ur-10, respectively. Names of a few key cultivars containing these genes are provided. Publications and information supporting the independence of these ten rust resistance genes in bean are cited and future considerations are provided.