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Genetics

Semi-Incompatibility in Cochliobolus carbonum. S. C. Dalmacio, Graduate Assistant, Department of Plant Pathology, The Pennsylvania State University, University Park 16802; R. R. Nelson, Evan Pugh Professor, Department of Plant Pathology, The Pennsylvania State University, University Park 16802. Phytopathology 66:655-656. Accepted for publication 14 November 1975. DOI: 10.1094/Phyto-66-655.

The formation of the “barrage” phenomenon in certain crosses of Cochliobolus carbonum enables detection of semi-incompatibility and reciprocal compatibility. Genetic studies indicate that semi-incompatibility is conditioned by a single gene and that semi-incompatibility and inhibition of perithecial formation are controlled by the same gene.