Abstract:

Using three SSR marker which was closely linked to the avirulence gene Avr-pit，Avr-pia and PRE1 for PCR amplification of DNA in 209 Magnaporthe oryzae strains of different region Heilongjiang province. The result showed that the frequency of different avirulence gene is significant different in Heilongjiang province, and the appearance frequency of these three avirulence gene Avr-pit, Avr-pia and PRE1 were 43.59%,36.92% and 30.26%. The group structure of Magnaporthe oryzae was complex in Heilongjiang Province．The distribution of avirulence gene varied in different regions even in the same region．