Inheritance of Pathogenicity of Culture 70-1, Race 1, ofPuccinia recondita tritici

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Abstract
Culture 70-1 (race 1) of P. 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 [Triticum aestivum] lines (Lr) and 6 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 of cultivar El Gaucho fit a model with 2 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.

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