Stripe Rust Resistance in Chinese Bread Wheat Cultivars and Lines

Abstract

Identification of stripe rust resistance genes is extremely important for developing new resistant cultivars to control the disease. A total of 98 Chinese wheat cultivars and advanced lines were inoculated with 26 isolates of Puccinia striiformis f. sp. tritici (PST) for postulation of stripe rust resistance genes at seedling stage. The results indicated that 42 cultivars and lines possess the resistance gene Yr9, either independently or in combination with other resistance genes. Nineteen accessions carry Yr24 or Yr26. Seven entries showed resistant to the 26 isolates tested, whereas, six cultivars and lines were susceptible to all of them. It was indicated in the test that Yr10, Yr15, Yr24, and Yr26 were effective resistance genes against Chinese PST isolates, whereas Yr1 and Yr6 were susceptible to them. SSR analysis indicates that YrCH42 in Chinese wheat cultivar Chuanmai 42 is closely linked to Xgwm498 and Xwms273, with genetic distances of 1.6 cM and 2.7 cM, respectively. YrCH42, Yr24 and Yr26 are probably common genes according to their reaction patterns to the 26 isolates tested, as well as their chromosomal location and origins. In addition, a new stripe rust resistance gene on chromosome 7BL was detected in the Chinese wheat line Zhou 8425B, which is closely linked to Xcfa2040 and Xbarc32, with genetic distances of 1.4 cM and 4.8 cM, respectively