Evaluation of Resistance to Yellow Rust in some Wheat Advanced Lines

Virulence factors of three isolates of Puccinia striiformis f. sp. tritici collected from Ardebil، Zarghan and Sari were determined using yellow rust differential set and near isogenic lines. To evaluate resistance of wheat genotypes to three races 6 E 6A+، 6 E 150A+ and 198 E 150A+ of yellow rust، forty five advanced lines were investigated، using a randomized complete block design with three replications at seedling stage in greenhouse. Resistance components including latent period and infection type were recorded. Analysis of variance showed a significant difference at 1% probability level among the lines for both infection type and latent period. Lines no. 16، 18، 20، 22، 29، 30، 31، 40، 41، 42، 43 and 44 exhibited complete resistance to all races indicating the presence of seedling genes in these lines. With comparison of reactions of these lines and near isogenic lines to the races، the possibility of presence of some resistance genes in the test lines was postulated. Seedling resistance sources found in the present study can be used in combination with adult plant resistance in wheat breeding programs.