Molecular Detection of Stripe Rust Resistance Gene(s) in 115 Wheat Cultivars (lines) from the Yellow and Huai River Valley Wheat Region

摘要

Stripe rust (yellow rust), caused by Puccinia striiformis f.sp.tritici (Pst), is a serious disease of wheat worldwide, including China. Growing resistant cultivars is the most cost-effective and environmentally friendly approach to control the disease. To assess the stripe rust resistance in commercial wheat cultivars and advanced lines in the Yellow and Huai River Valley Wheat Region, 115 wheat cultivars (lines) collected from 13 provinces in this region were evaluated with the most prevalent Chinese Pst races CYR32, CYR33 and the new race V26 at seedling stage. In addition, these wheat entries were inoculated with the mixed races of CYR32 and CYR33 at the adult-plant stage in the field. The results indicated that 53 (46.1%) cultivars (lines) had all-stage resistance to all the three races, and 16 (13.9%) cultivars (lines) showed adult-plant resistance. The possible stripe rust resistance genes in these entries were postulated by the closely linked markers of all-stage resistance genes Yr5, Yr9, Yr10, Yr15 and Yr26 and adult-plant resistance gene Yr18. Molecular analysis indicated that resistance genes Yr5, Yr9, Yr10, Yr18 and Yr26 were found in 5 (4.3%), 38 (33.0%), 1 (0.9%), 2 (1.7%) and 8 (7.0%) entries, respectively. No entry was found to carry the Yr15 gene. In future breeding programs, Yr5, Yr15 and Yr18 should be used to pyramid with other effective genes to develop wheat cultivars with high-level and durable resistance to stripe rust, whereas Yr9, Yr10 and Yr26 should not be used or used in a limited way due to the virulent races present in China.