Inheritance study and validation of SCAR molecular marker for rust resistance in common bean
Inheritance study and validation of SCAR molecular marker for rust resistance in common bean
Souza, T.L.P.O. de; Alzate Marin, A.L.; Dessaune, S.N.; Nunes, E.S.; Queiroz, V.T. de; Moreira, M.A.; Barros, E.G. de
Crop Breeding and Applied Biotechnology 7(1): 11-15
2007
Common bean cultivar Mexico 309 presents a wide resistance spectrum to several pathotypes of the fungus Uromyces appendiculatus that occurs in the states of Minas Gerais and Goias, in Central Brazil. This pathogen is the causal agent of common bean rust. The present study had the following objectives: (i) to determine the inheritance of rust resistance in segregating populations obtained from crosses between cultivars Mexico 309 and Rudd (commercial cultivar susceptible to rust), and (ii) to validate the SCAR marker SI19460 as linked to Mexico 309" resistance gene. Results confirmed that 'Mexico 309' has a single dominant rust resistance gene (Ur-5) and that marker SI 19460 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 'Ruda' as one of the progenitors. A cultivar Mexico 309 apresenta um amplo espectro de resistencia a varios patotipos do fungo Uromyces appendicular, agente causal da ferrugem do feijoeiro comum, provenientes dos estados de Minas Gerais e Goias, Brasil Central. Assim, este trabalho teve como objetivos: (i) determinar a heranca da resistencia a ferrugem de Mexico 309 em populacoes segregates obtidas do sen cruzamento com a cv. Ruda (cultivar comercial, suscetivela ferrugem); e (ii) validar o marcador molecular SCAR SI19460 como ligado ao gene de resistencia presente em Mexico 309. Os resultados mostraram que Mexico 309 possui urn unico gene dominante conferindo resistencia ao U. appendiculatus. A analise com o marcador SI19460 demonstrou que o mesmo esta ligado, em aproximaccao, a 3,31 cM do gene de resistencia de Mexico 309 (gene Ur-5). Este marcadorpode ser utilizado para a selecao indireta de Ur-5 durante o desenvolvimento de linhagens com background genetico Ruda resistentes a ferrugem. Reprinted by permission of the publisher.