Monday, 20 June 2005 - 2:30 PM
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Identification of Quantitative Trait Loci Linked to White Mold Resistance in Common Bean.

Judd Maxwell, Mark Brick, and Patrick Byrne. Colorado State Univ, Department of Soil and Crop Sciences, Ft. Collins, CO 80523

Construction of molecular genetic linkage maps has become a powerful tool for identification of molecular markers linked to loci that control pathogen resistance. Resistance to white mold (Sclerotinia sclerotiorum) in common bean (Phaseolus vulgaris) is limited in commercial varieties, but has been reported in Andean germplasms. Resistance has been shown to be quantitatively inherited and difficult to screen in the field or greenhouse. The primary objective of our study was to identify and map quantitative trait loci (QTLs) that are tightly linked to white mold resistance. A recombinant inbred population of 115 lines (RIL) was developed to identify QTL for white mold resistance. We have identified 185 polymorphic markers were mapped 18 linkage groups. The data reveal that 26 of the 185 markers are significantly (p < 0.05) associated with low white mold resistance. The 26 markers are distributed among 6 of the 18 linkage groups. These results should provide bean breeders with tools to select based on molecular markers rather than traditional greenhouse and field screening methods.

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