兼抗抗白粉病和黄矮病小麦育种材料的创造与鉴定

白粉病和黄矮病是小麦生产上的重要病害，近几年来这两种病害经常在我国一些小麦产区同时发生。为解决该问题，本研究通过杂交、回交方法将抗黄矮病的Bdv2基因（源自于YW642）和抗白粉病的Pm21基因（源自于CB037）聚合在一起，育成了兼抗黄矮病和白粉病的小麦新材料。通过田间抗病性鉴定与分子标记辅助选择相结合，得到聚合了Bdv2基因和Pm21基因的BC1代小麦22株，F2代小麦51株。农艺性状调查显示，这些含Pm21和Bdv2基因的双抗白粉病和黄矮病小麦新材料的农艺性状优于感病植株和原先的亲本，可以在小麦白粉病和黄矮病兼性抗病育种中作为优异种质资源加以利用。

evelopment and detection of wheat germplasms with resistance to both powdery mildew and barley yellow dwarf virus

Powdery mildew and barley yellow dwarf virus (BYDV) are important diseases, which affect wheat production worldwide. Resent years, both diseases are simultaneously found in some areas of China. To solve this problem, a wheat-Thinopyrum intermedium translocation YW642, containing BYDV resistance gene Bdv2, and a wheat line CB037, containing powdery mildew resistance gene Pm21, had been used to cross and backcross in this study. Through the disease resistance tests and molecular marker-assisted selection, 22 BC1 plants and 51 F2 plants which contain both Bdv2 and Pm21 genes were obtained. These wheat materials showed highly resistant to both powdery mildew and BYDV. Agronomic trait assays displayed that those resistant plants possessing both Pm21 and Bdv2 genes were better than susceptible plants and the parents plants following inoculation with the pathogens. Thus, these resistant plants developed in the study can be used as good germplasm resources for wheat breeding with resistance to powdery mildew and BYDV.