Inheritance of yellow rust resistance in barley (Hordeum vulgare L.)

Abstract

The study was undertaken to determine the mode of inheritance of resistance to yellow rust (Puccinia striiformis f.sp. hordei) in identified barley lines, which are to be utilized in crossing programme for development of resistant varieties. Four resistant lines namely, RD 2552, RD 2503, RD 2508 and RD 2634 were crossed with susceptible line RD 103 to know the inheritance pattern of yellow rust resistance. The parents, F1, F2 and back cross generations of each cross were screened under artificially created epiphytic conditions for yellow rusts using a mixture of five barley pathotypes. The genetic analysis of different generations indicated that resistance to yellow rust of barley in the lines studied was governed by single dominant gene as the observed data segregated in 3:1 ratio. The dominance of resistance over susceptibility was confirmed by F2 and back cross generations of different cross combinations.