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Inheritance of Virulence of Culture 73-47 Puccinia recondita. Glen D. Statler, Associate Professor, Department of Plant Pathology, North Dakota State University, Fargo, ND 58102; Phytopathology 67:906-908. Accepted for publication 7 February 1977. Copyright © 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-906.

Puccinia recondita, culture 73-47, virulent on Triticum aestivum ‘Transfer’, was selfed to study the inheritance of virulence. The 62 S1 cultures resulting from selfing culture 73-47 were used to inoculate 11 isogenic wheat lines (Lr) and three tester cultivars. Culture 73-47 and all S1 cultures were virulent on Lr3 and Lr9, indicating that these genes were homozygous for virulence in the pathogen. Segregation of S1 cultures on Lr2c and Lr10 fit a model in which single dominant genes conditioning virulence were independently inherited. Culture 73-47 and all the S1 cultures were avirulent on Lr16, Lr19, and Transec. Segregation ratios indicated that single recessive genes conditioned virulence on Lr2, Lr17, Lr18, Lr24, Waldron, and El Gaucho. The recessive genes conditioning virulence were independently inherited except between Lr2 and Waldron and between Lr17 and Lr18 where linkage was indicated. Virulence on Lr1 fit a model with two recessive genes for virulence.

Additional keywords: leaf rust, virulence genes, segregation ratio, S1 cultures, infection type, heterozygosity.