The present article summarizes the identification and nomenclature of physiological races,infection mechanism,causes of variation and status of researches on gene of rice blast fungus.The lack of researches on the problems existed in species identification,infection mechanism and identification and application of avirulence genes for rice blast fungus have been discussed.Some strategies have been suggested,such as cultivating identification species of rice blast fungus used unified in international,enhancing some other infection ways of rice blast fungus for above ground parts of rice seedlings,and the research of avirulence genes of rice blast fungus,etc.,in order to deepen and speed up the research of rice blast fungus.

The bacterial blight resistance gene Xa23 newly found in the wild rice was introgressed into the three elite restorer lines to lay a solid foundation for the development of the bacterial blight resistance varieties.The marker-assisted selection(MAS) and leaf-cutting inoculation method were used to assay new lines.The early generation breeding materials were assayed with the inoculation of P6,and the progenies of these resistant materials were verified by the marker C189,which was closely linked with gene Xa23.Of the 272 resistant accessions revealed by the inoculation method,only 254 accessions were verified to be resistant by the marker C189 test.The late generation breeding materials were stable in phonotype,and the elite lines could be selected for the variety trial.