| Accurate evaluation of wheat resistance to the predominant Puccinia striiformis f.sp.tritici(Pst)races and understanding the corresponding components of resistance genes in wheat germplasm would provide insight into rational use and layout of new varieties.For this purpose,a total of 150 wheat varieties(lines)from Huang-Huai Valley Wheat Region were evaluated for their all-stage resistance(ASR) with predominant races CYR32,CYR33 and CYR34 under a control greenhouse and adult plant resistance(APR) was assessed in field under artificial inoculation and natural infection environments.In addition,these materials were also detected using various molecular markers linked with Yr genes including Yr5, Yr7, Yr9, Yr10, Yr17, Yr18, Yr26 and YrSP.Among the 150 tested varieties(lines),no material had ASR,but 47 materials displayed APR(accounting for 31.3%),and 31 materials showed slow rusting(accounting for 20.7%)and the remainings were susceptible.Resistance genes Yr7, Yr9 and Yr17 were postulated in 11,104 and 13 materials,respectively.Yr gene combinations Yr7+Yr9, Yr7+Yr17, Yr9+Yr17, Yr9+Yr18, Yr9+YrSP, Yr9+Yr17+Yr18 were also postulated in 1,1,10,3,1,2 materials,respectively.However,no material carried Yr5, Yr10 and Yr26.In addition,individual cultivars may carry new genes resistant to stripe rust but further genetic mapping analysis should be performed for confirmation.The above results showed that the comprehensive resistance of wheat varieties(lines) in Huang-Huai Valley wheat region was significantly improved compared with that 10 years ago,and the resistance mainly derived from gene combinations,such as Yr17, Yr18 and other gene combinations,which could enhance the resistance of wheat.The resistant genes of some materials with good resistance need further genetic analysis. |
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