Induction, Isolation and Characterization of Leaf Rust Resistant Mutants in Wheat Cultivar Kalyan Sona

Mutations for resistance to culture IL011 (race 77A) of Paccinia recondite Rob. ex Desm. f. sp. tritici were induced in wheat cultivar Kalyan Sana using ethyl methanesulphonate (EMS) treatment and 40 kR gamma irradiation. Two mutants identified after EMS treatment were designated as KSM 4233-US and KSM 4234. One mutant, designated as KSM 4238, was identified after gamma irradiation. Mutants 4234 and 4238 were resistant to leaf rust in field tests but KSM 4233-US segregated for susceptibility up to M, generation. The resistance of KSM 4234 to race 77A was due to one dominant and one recessive genes. The multipathotype teste using cultures IL007 (race 108), IL011 and IL017 (race 106) and the allelic tests suggest the origin of three new alleles.