Identification of Additional Genes Conferring Resistance to Puccinia Striiformis West in Yr. Lines of Barley

Barley cultivars, Abyssinian 14 (yr 1), 1.5 (yr 3), and Cambrinus (Yr 4) were genetically analysed against the Indian pathotypes G and 57 of barley stripe rust. Two tester lines, EB 410 (Ps 1) and EB 438 (ps 4), with known single gene for resistance to the races were used in the crosses to determine relationship between the genes concerned in stripe rust resistance present in the material under study. The F₁ and F₂ seedlings were tested against both the races. It was found that Abyssinian 14 possessed two dominant genes for resistance, one each effective against races G and 57. These genes for resistance are tentatively designated as Yr Ab. 14 1 and Ah. 14 2. Cv. 1.5 also possesses two dominant genes for resistance to the races and these were designated as Yr 1.5 1 and Yr 1.5 2. One dominant gene detected in the coltivar Cambrinus was allelic to the gene Ps 1 already identified in EB 410.