|Stone, Valerie - UNIV. OF PUERTO RICO|
|Urrea, Carlos - UNIV. OF PUERTO RICO|
|Beaver, James - UNIV. OF PUERTO RICO|
Submitted to: HortScience
Publication Type: Abstract Only
Publication Acceptance Date: March 5, 1997
Publication Date: N/A
Technical Abstract: A genetic linkage map of 170 RAPD markers mapped across 79 recombinant inbred lines (Dorado and XAN-176) reveal genomic regions that condition multiple disease resistance to fungal (Ashy Stem Blight-Macrophomina phaseolina), viral (bean golden mosaic virus-BGMV), and bacterial (common bacterial blight-Xanthomonas campestris pv. phaseoli) pathogens of common bean (Phaseolus vulgaris). A genomic site on linkage group US-1 had a major effect explaining 18, 34, and 40% of the variation in phenotypic reaction to ashy stem blight, BGMV, and common bacterial blight disease, respectively. Adjacent to this region was a QTL conditioning 23% of the variation in reaction to another fungal pathogen, web blight (Thanatephorus cucumeris). A second genomic site on linkage group US-1 had minor affect on multiple resistance expression to the same fungal (15%), viral (15%), and bacterial (10%) pathogens. It is unknown whether these specific genomic regions represent a series of linked QTL affecting resistance to each disease separately or an individual locus with pleiotropic effect against all three pathogens.