The effectiveness of resistance genes derived from Aegilops spp. to wheat rusts

Abstract

In this paper resistance of nearly isogenic lines with genes Sr32, Sr33, Lr9, Lr21 and Lr22 derived from Ae. squarrosa and Ae. umbellulata is presented. The genes Sr32 and Sr33 showed good effectiveness to different pathotypes of wheat stem rust in seedling stage. But, in adult stage lines with this genes were moderately resistant to very susceptible in Kragujevac and Zajeear. The most effective was gene Lr9. In our population of wheat leaf rust there is no alleles of virulence to this gene. The lines with other two genes (Lr21 and Lr22) were susceptible in Novi Sad and moderately susceptible in Kragujevac. Studies showed that Aegilops spp. is very important source of Sr and Lr genes of resistance.