中文摘要：

为创制杂交小麦白粉病抗性定向改良育种新体系,以白粉病抗源材料N95175、N9134为抗病种质,以强优势杂交小麦新品种"西杂一号"和"西杂五号"的亲本为受体,以陕西不同地区小麦白粉病流行混合菌种为菌源,对供试材料亲本、杂种F1代和回交后代材料进行了苗期和成株期抗性鉴定,并利用与抗白粉病基因Pm21共分离的SCAR标记、抗白粉病基因PmAS846紧密连锁的SSR标记作为抗病性定向选择分子标记进行了抗病性鉴定。结果表明,以N95175、N9134为亲本的杂种F1含有Pm21基因或PmAS846基因,苗期和成株期均表现为高抗,与抗病亲本的抗病性表现基本一致,符合杂种优势表现显性假说,其抗病性主要由显性单基因控制。研究同时表明,仅凭借表型鉴定结果盲目性较大,表型鉴定和分子标记鉴定相结合准确率较高。

英文摘要：

To develop a combination of wheat hybrid system with high resistance to powdery mildew diseases,we used N9134,N95175 as sources for resistance to powdery mildew to improve the parents of the strong advantage of series of XIZA hybrid varieties of wheat.Wheat powdery mildew fungus strains from different regions in shaanxi province were collected and used to inoculate the parents,F1 offspring and backcross offspring.Meanwhile,the SCAR markers co-separated with Pm21 gene and the SSR marker closely linked with...