Genetics of adult plant stripe rust resistance in three durum cultivars

摘要

Sustained control of rust diseases depends on the availability of genetically diverse sources of resistance and their combined deployment in new cultivars. This study was conducted on three adult plant stripe rust resistant durum cultivars. Adult plant stripe rust response tests on F_3 populations generated from crosses involving resistant cultivars Kamilaroi, Wollaroi, Yallaroi and the susceptible genotype Bansi indicated the involvement of three genetically independent genes in controlling high level of adult plant stripe rust resistance in these cultivars against Puccinia striiformis f. sp tritici pathotype 110 E143A+. Tests with a more recently detected pathotype 134 E16A+ suggested that one of the genes carried by cultivars Wollaroi and Yallaroi was not effective against this pathotype and consequently digenic inheritance of resistance was observed. Results from tests on F_2 populations derived from crosses of Kamilaroi with Wollaroi and Yallaroi and close pedigree relationship suggested thatthese cultivars shared gene (s) in common. Results presented in this investigation stressed the need to increase genetic diversity for stripe rust resistance in new cultivars.