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Genetics

Inheritance of Avirulence/Virulence in a Cross of Two Isolates of Magnaporthe grisea Pathogenic to Rice. A. H. Ellingboe, Departments of Plant Pathology and Genetics, University of Wisconsin, Madison 53706; Bai-Chai Wu, and W. Robertson. Departments of Plant Pathology and Genetics, University of Wisconsin, Madison 53706. Phytopathology 80:108-111. Accepted for publication 10 August 1989. Copyright 1990 The American Phytopathological Society. DOI: 10.1094/Phyto-80-108.

A cross was made between two isolates, Guy 11 and 6-28, of Magnaporthe grisea that are pathogenic to rice. Progenies were tested for avirulence/virulence on eight rice cultivars. Both parents and all progeny were virulent on rice cultivar S201. Isolates Guy 11 and 6-28 differed in virulence on seven cultivars. Segregation among the progenies for avirulence/virulence on the seven cultivars indicated that at least seven genes were segregating.

Additional keywords: genetics of host-parasite interactions, Oryza sativa, Pyricularia oryzae.