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The hard red spring wheat cultivars Grandin and CDC Teal were genetically examined to determine the number and identity of the leaf rust resistance genes present in both wheats. The two cultivars were crossed with the leaf rust susceptible cultivar Thatcher, and the F 1 plants were backcrossed to Thatcher. Fifty-four and 80 BC 1 F 1 plants derived respectively from Grandin and CDC Teal were selfed to produce BC 1 F 2 families. The BC 1 F 2 families were tested as seedlings with isolates of Puccinia recondita f. sp. tritici that differed for virulence to specific leaf rust resistance genes. The BC 1 F 2 families were also tested in the adult-plant stage in field rust nursery tests. Segregation of BC 1 F 2 families in the seedling tests indicated that Grandin had resistance genes Lr2a, Lr3, and Lr10, and was heterogeneous for Lr16. CDC Teal was shown to have the seedling leaf rust gene Lr1. In field rust nursery tests, both Grandin and CDC Teal were shown to have adult-plant resistance genes Lr13 and Lr34. Additional leaf rust resistance genes that condition effective field resistance should be incorporated into hard red spring wheat cultivars to diversify the leaf rust resistance in this wheat class.

Inheritance of Leaf Rust Resistance in Wheat Cultivars Grandin and CDC Teal