VIEW ARTICLE

Inheritance of Pathogenicity of Culture 70-1, Race 1, of Puccinia recondita tritici. Glen D. Statler, Professor, Department of Plant Pathology, North Dakota State University, Fargo, 58105; Phytopathology 69:661-663. Accepted for publication 8 January 1979. Copyright 1979 The American Phytopathological Society. DOI: 10.1094/Phyto-69-661.

Culture 70-1 (race 1) of Puccinia recondita tritici was selfed to study the inheritance of virulence. The 60 S₁ cultures resulting from selfing culture 70-1 were used to inoculate 13 isogenic wheat lines (Lr) and six tester cultivars. Segregation of S₁ cultures on Lr1, Lr2, Lr2c, Lr3, Lr3ka, Lr17, Lr18, and Lr21, fit a model in which single recessive genes conditioned virulence. Segregation for pathogenicity on Terenzio closely approached, but did not fit, a 3:1 ratio; virulence probably was conditioned by a single recessive gene. The recessive genes were inherited independently, but chi-square tests indicated linkage associations between p2 and p2c, p17 and p18, and p3 and pT. Pathogenicity on Cultivar El Gaucho fit a model with two recessive genes for virulence. Culture 70-1 and all the S₁ cultures were avirulent on Lr9, Lr10, Lr16, Lr19, Lr24, and cultivars Waldron, Transec, and Kenya Farmer, indicating that the corresponding genes for pathogenicity were homozygous avirulent in culture 70-1, race 1.