Identification and Evaluation of Resistance to Stripe Rust in Current Wheat Cultivars(Lines) from Sichuan Basin

Knowledge on the resistance levels and resistance genes to stripe rust in the cultivars currently grown in Sichuan basin,which is a key inoculum overwintering regions in China,can be used to enhance the breeding and producing of wheat.Assemble a set 67 of wheat entries,including 23 elite cultivars and 44 advanced lines in the region,were tested with selected Pst races on seeding and adult plant stages in the greenhouse and field,and were postulated the resistance genes by DNA marker combining with testing resistance spectrum and analysising pedigree.The results showed that there were 10 cultivars that had all stage resistance;22 cultivars had adult plant resistance;35 cultivars were susceptible;and over 60% of current elite cultivars were susceptible.19 cultivars possibly carried Yr26;7 cultivars possibly carried Yr26+?.The loss of resistance to stripe rust in the local cultivars was because of the emerging pathotypes which were virulent to Yr26.The research suggest that breeders and farmers should pay attention to the new pathotype of stripe rust.