Pathogenicity and avirulence genes analysis of Magnaporthe grisea Barr. from rice in Fujian Province of China Study on virulence genes of population of Puccinia recondtia f.sp.tritici in different wheat ecological areas of Shanxi Identification of Candidate Expressed Sequences Associated with Race-specific Avirulence Genes by cDNA-Amplified Fragment Length Polymorphism