Reaction of some wheat commercial varieties and advanced lines to septoria tritici isolates

Septoria tritici blotch (STB), caused by the ascomycete Mycosphaerella graminicola is a hetrotalic bipolar fungi which in some part of Iran cause economic loss periodically. In this experiment reaction of 43 genotypes contain 25 tetraploid advance lines and 18 commercial bread wheat cultivars to 6 Iranian isolates under greenhouse condition was evaluated at the seedling stage in two separate experiments. Significance Results of genotype × isolate interaction indicated the different between isolates and the different reaction of genotypes to M.graminicola isolates. Results of the reaction of genotypes to isolates showed that most of tetraploid lines and commercial hexaploid wheat are susceptible to isolates and there is some specific reaction between some genotypes and isolates, in this study Marvdasht commercial bread wheat cultivar was known as a high resistant hexaploid cultivar and Aria as a tetraploid wheat.