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由小麦白粉病菌 (Erysiphe graminis tritici) 引起的小麦白粉病是我国各小麦产区的主要病害之一。随着栽培水平的提高,矮杆品种的推广,白粉病的发生及危害也日趋严重。推广高度抗病的新品种是防治小麦白粉病最经济有效的途径,但是由于新的致病类群的不断出现,常使一些原来抗病的品种经过几年大面积推广种植以后,便开始丧失抗性而感病,抗白粉病基因 Pm8 在我国由抗病变成为感病就是一个实例。因此,育种工作必须经常不断地使用新的抗病基因来对付病原菌新致病类群的挑战。
Wheat powdery mildew caused by Erysiphe graminis tritici is one of the main diseases in various wheat producing areas in China. With the improvement of cultivation level, the promotion of dwarf bar varieties, the occurrence and harm of powdery mildew have also become increasingly serious. The promotion of highly resistant new varieties is the most economical and effective way to control wheat powdery mildew. However, due to the continuous emergence of new pathogenic groups, some original disease-resistant varieties often start to lose their resistance after being popularized for several years Sex and disease, resistance to powdery mildew gene Pm8 in China by the disease into a susceptible is an example. As a result, breeding efforts must constantly use new resistance genes to deal with the challenge of new pathogenic groups of pathogens.