Inheritance of Virulence ofPuccinia reconditaf. sp.triticion Durum and Spring Wheat Cultivars

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Abstract
Cultures 70-1 and 71-112 P. recondita f. sp. tritici were crossed and the resulting F1 selfed to study the inheritance of virulence on several isogenic lines of T. aestivum and cultivars of T. durum. Segregation of F2 cultures on isogneicn lines with genes Lr1, Lr2, Lr3ka, Lr11, Lr17, LrEG and LrT fit a model in which single recessive genes conditioned virulence. Segregation on the durum cultivars ''Botno'',''Calvin'', ''Edmore'', ''Rugby'', ''Ward'' and ''Vic'' also fit a single recessive gene model. Segregation on ''Wells'' was closer to a 9:7 than a 3:1 ratio. Most of the single recessive genes for virulence were inherited independently except for a rather close linkage between p11 and pEG and linkage between p1 and pEG. Several associations were detected between genes for virulence on the durum cultivars. Genes for virulence on ''Edmore'' were apparently linked to those for virulence on Lr11, LrEG, ''Botno'', and ''Calvin''. Genes for virulence on ''Rugby'' were linked to those for virulence on LrT, ''Botno'' and ''Edmore''. Genes for virulence on ''Ward'' were linked to those for virulence on ''Botno'', ''Edmore'' and ''Rugby''. Linkage was also indicated between genes for virulence on ''Botno'' and those for virulence on ''Calvin'', ''Edmore'', ''Rugby'' and ''Ward''. The F2 segregations that fit 3:1 ratios on the durums also fit a 1:2:1 ratio when the infection types 2 and 2+ were placed in the intermediate category. Segregation for virulence on lines with Lr10, Lr16, and cultivars 5534, Waldron and Olaf fit a digenic recessive ratio. These segregations on cultivar 5534 and Lr10 fit a ratio for 2 gene pairs in common. The F2 cultures segregated for 2 recessive genes for virulence on the durum cultivars ''Crosby'', ''Golden Ball'', ''Leeds'', ''Rolette'' and ''Stewart 63''. Segregation for virulence on the durums ''Cando'' and ''Wells'' and the T. aestivum line Lr3 fit a ratio for 2 recessive genes with either or both homozygous genes conditioning virulence. Segregation on the durum cultivar ''D6618'' indicated a single dominant gene for virulence.