Molecular markers linked to genes for specific rust resistance and indeterminate growth habit in common bean

Bulked segregant analysis was utilized to identify random amplified polymor phic DNA (RAPD) markers linked to genes for specific resistance to a rust p athotype and indeterminate growth habit in an F-2 population from the commo n bean cross PC-50 (resistant to rust and determinate growth habit) x Chich ara 83-109 (susceptible to rust and indeterminate growth habit). Six RAPD m arkers were mapped in a coupling phase linkage with the gene (Ur-9) for spe cific rust resistance. The linkage group spanned a distance of 41 cM. A RAP D marker OA4.1050 was the most closely linked to the Ur-9 gene at a distanc e of 8.6 cM. Twenty-eight RAPD markers were mapped in a coupling phase link age with the gene (Fin) for indeterminate growth habit. The linkage group s panned a distance of 77 cM. RAPD markers OQ3.450 and OA17.600 were linked t o the Fin allele as flanking markers at a distance of 1.2 cM and 3.8 cM, re spectively. The RAPD markers linked to the gene for specific rust resistanc e of Andean origin detected here, along with other independent rust resista nce genes from other germplasm, could be utilized to pyramid the different genes into a bean cultivar for durable rust resistance.