Identification of avirulence genes of Magnaporthe grisea and selection of molecular markers

摘要

The molecular basis of cultivar specificity in rice blast disease has been studied in certain race-cultivar combinationsSweigard et al., 1993; Smith and Leong, 1994; Leong et al., 1994; Valent and Chumly 1994; Farman and Leong, 1996; Mandel et ai.,1997. Among these, some specificity are unstable (Valent and Chumley, 1994) and others are stable (Mandel et al., 1997). And the we can see various degree of resistance reaction can be seem.from no visible symptom to big brown lesions. It is considered that the molecular mechanisms behind race-cultivar interactions varies with the host-pathogen combinations. Thus we started studies toward cloning of other avirulence genes.