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Common bacterial blight (CBB), incited by  Xanthomonas campestris  pv.  phaseoli  ( Xcp ), an important disease in common bean ( Phaseolus vulgaris  L.) Tepary bean ( P. acutifolius  A. Gray) is of interest to bean breeders because of resistance to CBB. Our objective was to identify RAPD markers linked to major genes for CBB resistance using bulked segregant analysis in an F 2  population from a tepary bean cross CIAT640005 (R) X Nebr#4B (S). A total of 57 RAPD primers (602 RAPD primers screened) showed polymorphisms between bulked DNA derived from R and S CBB plants. All markers showed coupling linkage with CBB resistance. A good fit to a 3:1 ratio of bands for presence and absence using 11 RAPD primers was observed in 77 F 2  plants. Markers of U-15 and L-7 primers were 2.4 cM distant from the gene for resistance to  Xcp  strain LB-2. RAPD markers of U-10, U-20, S-12, Y-4, F-13, P-6, Q-1, and Q-ll primers were 2.4 cM distant from the gene for resistance to  Xcp  strain SC-4A. RAPD markers of IJ-15 and L-7 primers were 8.4 cM distant from the gene for resistance to  Xcp  strain EKl l. The tepary RAPD linkage group includes three molecular markers and three genes for resistance to  Xcp  strains EK-l l, LB-2, and SC-4A and spans a length of 19.2 cM. This data supports the presence of  Xcp  races.

hortscience

Identification of RAPD Markers Linked to Major Genes for Common Bacterial Blight (CBB) Resistance Using Bulked Segregant Analysis in a Tepary Bean Cross