摘要Dear Editor,Triticum petropavlovskyi,commonly known as Xinjiang rice wheat,is a unique hexaploidy wheat grown in the Xinjiang area.T.petropavlovskyi is marked by its elongated glume(Eg)trait,which is controlled by gene P1pet located on chromosome 7A(Wang et al.,2002;Watanabe and Imamura,2002).The origin of T.petropavlovskyi has been disputed.It is generally accepted that P1pet was introduced from tetraploid polish wheat(T.polonicum)via a hybridization with hexaploid common wheat(T.aestivum)(Akond et al.,2008;Chen et al.,2016).The P1pet has pleiotropic effects in the increase of spike length,grain length,and grain weight,and decrease of fertility,grain number,and awn length(Okamoto et al.,2013),indicating the potential impact of P1pet on grain yield-related traits.The cloning of P1pet will provide evidence for the prognosis of whether a mutation at P1 in T.petropavlovskyi or T.polonicum gave rise to the Eg trait and facilitate the utilization of this unique species in breeding for yield improvement.