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Strain specific reaction of field resistance of japanese rice varieties revealed with philippine strains of rice blast fungus pyricularia oryzae



Strain specific reaction of field resistance of japanese rice varieties revealed with philippine strains of rice blast fungus pyricularia oryzae



Japanese Journal of Breeding 31(3): 293-301



Japanese varieties (24) with known level of field resistance in Japan were tested with 3 Philippine fungus strains and 2 Japanese strains in a greenhouse experiment. The 3 Philippine strains were chosen for their virulence to the tested varieties out of 80 isolates. The 3 strains have differential virulence to some selected resistance types in the Philippines. Against 2 Japanese strains, the resistance manifested by 4 upland varieties was very high, in accordance with previously reported data. Although the infection was too severe to clearly differentiate the level of field resistance among ordinary lowland varieties, several varieties, including Yamabiko and Kogane Nishiki, were less severely infected than Norin 29 and Koshihikari in accordance with a general tendency in Japan. Against the Philippine strains the level of the infection was generally lower than those caused by Japanese strains. The highly susceptible reaction of Norin 6 and Aichi Asahi indicated that the infection was severe enough to differentiate the field resistance among the entries. Next to Norin 6 and Aichi Asahi, Yamabiko and Kogane Nishiki were more susceptible than Koshihikari and Norin 29 which are generally among the most susceptible to Japanese fungus strains. Inspection of lesion types on these varieties, when infected by the Philippine fungus strains, showed that the lesions on the leaves of Yamabiko and Kogane Nishiki were expanding ones with a grayish green margin, while those on Norin 29 and Koshihikari were characterized by a brownish margin. The field resistance which is relatively stable to various strains of the fungus is ineffective to some exotic strains. All of field, quantitative, partial or incomplete resistance and not necessarily non-specific, horizontal or general resistance.

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