Inheritance study and validation of SCAR molecular marker for rust resistance in common bean

Abstract

Common bean cultivar Mexico 309 presents a wide resistance Uromyces appendiculatus that occurs in the states of Minas Gerais and Goiás, agent of common bean rust. The present study had the following objectives: (i) in segregating populations obtained from crosses between cultivars Mexico 309 spectrum to several pathotypes of the fungus in Central Brazil. This pathogen is the causal to determine the inheritance of rust resistance and Rudá (commercial cultivar susceptible to rust), and (ii) to validate the SCAR marker SI119 459 as linked to “Mexico 309' resistance gene. Results confirmed that Mexico 309' has a single dominant rust resistance gene (Ur-5) and that marker SI19 5 is linked in coupling phase at 3.31 cM of this gene. This marker can be used for indirect selection of gene Ur-5 during the development of common bean lines resistant to rust using ‘Rudd’ as one of the progenitors.