在作物抗病育种工作中,育种材料的抗性鉴定是一个重要环节。水稻对叶瘟的抗性一般根据病斑型和病斑数量,以“高抗”到“高感”的级别来表示,并以此作为筛选的依据。弗罗尔提出的“基因对基因”学说认为,相当于病原菌的非致病性或致病性基因,在寄主植物上也相应地有抗病或感病基因。一旦病原菌的非致病基因转变为致病基因,则寄主的抗病性开始丧失。大量研究证明,稻瘟菌的生理分化是十分普遍的,由单 Resistance of breeding materials in the work of crop breeding is an important part. Resistance to leaf blast in rice is generally based on the number of plaques and lesions, which is indicated by the level of “high resistance” to “high sensitivity”, and is used as the basis for screening. Flor’s “gene-to-gene” doctrine holds that non-pathogenic or pathogenic genes, which are equivalent to pathogenic bacteria, also have disease-resistant or susceptible genes on host plants. Once the pathogen’s non-pathogenic gene is transformed into a pathogenic gene, the host’s disease resistance begins to lose. A large number of studies have shown that the physiological differentiation of Magnaporthe grisea is very common, from a single