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Inheritance of leaf rust reaction and other characters in a spring wheat cross



Inheritance of leaf rust reaction and other characters in a spring wheat cross



Agron Jour 45(2): 43-48



Lee, a selection of Hope x Timstein, resistant to leaf rust of wheat, Puccinia rubigo-vera tritici, both in the mature-plant stage to a collection of races and in the seedling stage to 22 individual races, was crossed with Mida, a susceptible var. to produce the hybrid generations of F1, F2, F3, F4 and back-crosses to each parent. Field observations indicated that the resistance of Lee, in the mature-plant stage, to a collection of races of leaf rust was differentiated from the susceptibility of Mida by 2 pairs of independently-inherited genes. These genes were additive in effect and susceptibility appeared to be partially dominant. Some plants and lines that were highly susceptible to stem rust, P. graminis tritici occurred in hybrid progenies in which both parents were resistant. Segregations obtained in F2 and F3 are explained by postulating duplicate, independently-inherited dominant factors for resistance, one from each parent. Seedling studies of F4 progenies of 90 F3 lines selected at random with reference to reaction to individual races of leaf rust in the seedling stage in the greenhouse, showed that the resistance of Lee to race 126 was governed by a single recessive factor and to race 5 by a single dominant factor. These two factors were linked with a recombination percentage of 21[plus or minus]2.7. Both parents were highly resistant to race 9, and the segregation for moderate resistance can be explained on the basis of duplicate factors. The hairy auricle of Mida was differentiated from the nonhairy auricle of Lee by a single dominant factor. The brown coleoptile of Mida was differentiated from the pale-green coleoptile of Lee by a single-factor difference. Tests for independence indicated that most of the characters concerned were associated. The Lee factors for resistance of leaf-rust races 9, 5, and 126 in the seedling stage, whether dominant or recessive, as well as one of the 2 factors for mature plant resistance in the field, all appeared to be associated in inheritance.

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