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Dear Editor,Common wheat (Triticum aestivum,2n =6x =42,AABBDD) is one of the most widely cultivated cereal crops,providing ～20％ of the calories consumed by humans (Fu et al.,2009).However,wheat production is constantly challenged by powdery mildew disease,which occurs globally and is caused by the biotrophic fungal pathogen Blumeria graminis f.sp.tritici (Bgt).Utilization of powdery mildew resistance (Pm) genes is the most effective and economical way to control powdery mildew disease.