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The Inheritance of Factors in Cochliobolus sativus Conditioning Lesion Induction on Gramineous Hosts. D. M. Kline, Plant Pathologist, Crops Research Division, ARS, USDA, Raleigh, North Carolina 27607; R. R. Nelson, Professor, Department of Plant Pathology, The Pennsylvania State University, University Park 16802. Phytopathology 61:1052-1054. Accepted for publication 2 April 1971. DOI: 10.1094/Phyto-61-1052.

Sixty-three monoascosporic cultures were derived from crossing two isolates of Cochliobolus sativus, one pathogenic and one nonpathogenic to six gramineous species. Progeny cultures were tested for pathogenicity to the differentially reacting grass species, and seven different genes for lesion induction were identified. The assumption of pathogenic specificity conditioned by different genes seems valid because individual ascospores differed in pathogenicity to different testers, and recombinant phenotypes representing recombinant genotypes were observed on all paired combinations of the six tester grasses. Pathogenicity to a given species was simply inherited and dependent upon one or two genes.