Puccinia recondita, culture 73-47,, virulent on Triticum inherited. Culture 73-47 and all the S, cultures were avirulent aestivum 'Transfer', was selfed to study the inheritance of on Lrl6, Lrl9, and Transec. Segregation ratios indicated that virulence. The 62 Si cultures resulting from selfing culture 73-single recessive genes conditioned virulence on Lr2, Lrl7, 47 were used to inoculate 11 isogenic wheat lines (Lr) and Lr18, Lr24, Waldron, and El Gaucho. The recessive genes three tester cultivars. Culture 73-47 and all S cultures were conditioning virulence were independently inherited except virulent on Lr3 and Lr9, indicating .that these genes were between Lr2 and Waldron and between Lr1 7 and Lr18 where homozygous for virulence in the pathogen. Segregation of S1 linkage was indicated. Virulence on Lrl fit a model with two cultures on Lr2c and LrlO fit a model in which single recessive genes for virulence. dominant genes conditioning virulence were independently
Reaction to different Puccinia recondita f. sp. tritici cultures was used to determine probable genotypes for seedling resistance in several hard spring wheat (Triticum aestivum L.) cultivars grown in North Dakota. Many of the cultivars studied can be combined into groups on the basis of sharing the same genes for resistance. Several cultivars probably have Lr2a and/or Lrl0 and a few contained Lrl. It is likely that most of these cultivars have genes in addition to those determined by this method as well as genes for adult plant resistance.
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