STRIPE RUST RESISTANCE IN CHINESE BREAD WHEAT CULTIVARS AND LINES

摘要

Identification of stripe rust resistance genes is extremely important for developing newresistant cultivars to control the disease. A total of 98 Chinese wheat cultivars andadvanced 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 indicatedthat 42 cultivars and lines possess the resistance gene Yr9, either independently orin combination with other resistance genes. Nineteen accessions carry Yr24 or Yr26.Seven entries showed resistant to the 26 isolates tested, whereas, six cultivars and lineswere susceptible to all of them. It was indicated in the test that YrlO, Yrl5, Yr24,and Yr26 were effective resistance genes against Chinese PST isolates, whereas Yrland Yr6 were susceptible to them. SSR analysis indicates that YrCH42 in Chinesewheat cultivar Chuanmai 42 is closely linked to Xgwm498 and Xwms273, with geneticdistances of 1.6 cM and 2.7 cM, respectively. YrCH42, Yr24 and Yr26 are probabiycommon genes according to their reaction patterns to the 26 isolates tested, as well astheir chromosomal location and origins. In addition, a new stripe rust resistance geneon chromosome 7BL was detected in the Chinese wheat line Zhou 8425B, which isclosely linked to Xcfa2040 and Xbarc32, with genetic distances of 1.4 cM and 4.8 cM,respectively.