Study on resistance of wheat commercial cultivars to yellow rust to some isolates (Puccinia striiformis f. sp. tritici) from different regions of Iran

To breed for resistant cultivars of wheat to yellow rust disease, it is necessary to determine characteristic of the disease pathosystem pathogencity. In this study virulence factors was determined of six pathotypes of yellow rust that has been collected from regions Zarghan, Gorgan, Ardebil, Mamasani, Sari, Hamedan with using from Standard set and near Isogenic lines of wheat yellow rust. Also resistance of some wheat commercial cultivars was evaluated with that pathotypes. Experimenter materials in seedling stage, the stage 12 from Zadoks scale were inoculated with six pathotypes separate. In all plants, resistance components including latent period (days from inoculation to first pustule eruption) and Infection type were recorded after appearance of pustules on leaves. Analysis of variance showed significant difference among of these cultivars for all traits to all pathotypes. Wheat line Mv17 and cultivars, Sivand, Parsi, Dena and Morvarid were resistant to all races that provide seedling resistance sources to these pathotypes. To genetic study resistance of wheat genotypes, virulence and avirulance factors was identified by determining of pathotypes, by reaction of genotypes to this pathotypes compared and from comparisoning that identified probability existence of resistance genes. Achieved result for plant of carrier genes YrA, Yr25, Yr23, Yr22, Yr9, Yr7, Yr6, Yr2, virulence observed in all of regions understanding and in plant of carrier gens YrCV, YrSP, Yr15, Yr10, Yr5, Yr4, Yr3, Yr1, virulence did not observe in six of pathotypes. genes that resistance in all of regions are introduce as a source resistance of effective gene for using along with genes that are responsible of effective resistance in adult plant stage.