Identification of Powdery Mildew Resistance Genes in Wheat

Abstract

One of the main conditions for successful breeding for resistance to parasites is the selection of parents different in genes which control these characters. In Yugoslavia only Pm 4a gene expresses resistance in interaction with most isolates different in virulence at the seedling stage. There is a question how to explain complete resistance to Erysiphe graminis tritici of many lines at the seedling stage and field conditions. It might be supposed that these lines possess some another single Pm gene or that few genes act complementary. One of the possible ways to answer on this question is to analyze inheritance of the resistance in progenies from crosses of tested variety or line and all lines which carry single Pm genes. If some of the known genes are included in inheritance there are expected differences in segregation ratio in comparison with other combinations.