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Complementary genes for leaf rust resistance and the inheritance of stem rust reaction and awnedness in a spring wheat cross



Complementary genes for leaf rust resistance and the inheritance of stem rust reaction and awnedness in a spring wheat cross



Journal of the American Society of Agronomy 39(9): 739-749



Plants and lines which were highly resistant to leaf rust occurred in the progeny of a cross between two susceptible varieties, Thatcher and Triunfo. The segregations obtained in F2 and F3 were fairly satisfactorily explained by postulating two complementary dominant genes, one from each parent. Because there was some indication that one or more modifying genes might be present, an alternative hypothesis involving three gene pairs also was suggested. Under this hypothesis, two genes, noncomplementary to each other, are contributed by one parent, and these two genes are complementary, either singly or in combination, with one gene contributed by the other parent. Preliminary studies in the greenhouse on mature plant reactions indicated that the complementary effect observed in the field was not the result of a situation whereby the gene contributed by Thatcher conditions resistance to one race or group of races, and the Triunfo gene governs resistance to another race or group of races. Greenhouse studies of seedling reactions revealed that the resistance observed in the field is a mature plant reaction. Seedlings from resistant, segregating, and susceptible lines all proved to be completely susceptible.

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