First author: Research Fellow of the Japan Society for the Promotion of Science; and second through tenth authors: Faculty of Agriculture, Kobe University, Nada, Kobe 657-8501, Japan
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Accepted for publication 30 May 2000
A genetic cross was performed between a Setaria isolate (pathogenic on foxtail millet) and a Triticum isolate (pathogenic on wheat) of Magnaporthe grisea to elucidate genetic mechanisms of its specific parasitism toward wheat. A total of 80 F1 progenies were obtained from 10 mature asci containing 8 ascospores. Lesions on wheat leaves produced by the F1 progenies were classified into four types, which segregated in a 1:1:1:1 ratio. This result suggested that the pathogenicity of the F1 population on wheat was controlled by two genes located at different loci. This idea was supported by backcross analyses. We designated these loci as Pwt1 and Pwt2. Cytological analyses revealed that Pwt1 and Pwt2 were mainly associated with the hypersensitive reaction and papilla formation, respectively.
© 2000 The American Phytopathological Society