Abstract
Data on host-pathogen relationship of rice (Oryza sativa) and blast (Pyricularia oryzae) obtained in Niigata Prefecture, Japan were analyzed by virulence analysis, and analysis of distribution pattern of virulence gene numbers. The percent growing areas (frequencies) of rice varieties with various genotypes for blast resistance were obtained from statistics data, and frequencies of blast-fungus genotypes for virulence were calculated from the data from 1976 to 1986 in six areas in Niigata Prefecture. The results of virulence analysis showed that nonrandom association was found between two virulence genes, Av-a+ and Av-i+. Nonrandom associations of virulence genes were also detected by analysis of the distribution pattern of virulence gene numbers. The deviation of distribution pattern from that expected from random association of virulence genes was mostly explained by specific interaction of virulence genes, Av-a+ and Av-i+.
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