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Genetic analysis of mutations to increased virulence in Magnaporthe grisea

Genetic analysis of mutations to increased virulence in Magnaporthe grisea

Phytopathology 83(10): 1093-1096

An isolate of Magnaporthe grisea, 70-14, virulent on 10 cultivars of rice, but avirulent on rice cultivar Katy, was mutagenized with nitrosoguanidine. Four mutants of independent origin that showed an increase in virulence on Katy were recovered. The virulence on the other 10 rice cultivars was not affected. The lesion size caused by these mutants was intermediate between the parent avirulent isolate, 70-14 (infection type 1), and a virulent isolate, 70-6 (infection type 4). The numbers of lesions also decreased at least 10-fold when compared to numbers of lesions caused by a virulent wild-type isolate. A range of lesion types (0-4) was common in these mutant isolates, with both small and large lesions. In contrast, wild-type virulent isolates always gave large lesions. The lesions of the mutants had a wide, brownish lesion edge compared to the watersoaked appearance of lesions of a virulent wild-type isolate. Genetic analysis showed that in two of the mutants, one of the two avirulence genes in 70-14, P12, was mutated. A new locus, M, was mutated in the other two isolates and identified as being required for the expression of avirulence genes. In addition, a mutation of the suppressor, S11, of the fourth mutant also may have been recovered.

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Accession: 002390213

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