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Gene-for-Gene Interactions During Primary Infection of Wheat by Erysiphe graminis f. sp. tritici. R. S. Slesinski, Predoctoral Fellow, Department of Botany and Plant Pathology, Michigan State University, East Lansing 48823, Present address of senior author: Genetics Unit, Massachusetts General Hospital, Boston, Massachusetts 02114; A. H. Ellingboe, Associate Professor, Department of Botany and Plant Pathology, Michigan State University, East Lansing 48823. Phytopathology 60:1068-1070. Accepted for publication 16 February 1970. DOI: 10.1094/Phyto-60-1068.

Two cultures of Erysiphe graminis f. sp. tritici (MS-1 and MS-76) which possess the corresponding P1 and p1 genes, respectively, were used to study the development of elongating secondary hyphae (ESH) on wheat lines containing either Pm1 or pm1. Development of ESH with the p1/Pm1 genotype, a compatible combination, was similar to that observed with compatible combinations in the absence of specific Pm genes (p1/pm1 or P1/pm1). The formation of ESH was inhibited only with the P1/Pm1 genotype.