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Verification of Infection-Type Data for Identification of Genes for Resistance to Leaf Rust in Some Hard Red Spring Wheat

Cereal Rust Lab., USDA-ARS, Dep. of Plant Pathology, University of Minnesota, St. Paul, MN 55108

^* Corresponding author.

Infection-type data have been used to postulate the genes present in wheat (Triticum aestivum L.) cultivars conditioning resistance to wheat leaf rust (Puccinia recondita Rob ex Desm. f. sp. tritici). Conventional genetic studies confirmed the accuracy of the hypothetical resistance genotypes derived from infection-type data. The objectives of this study were to: (i) postulate the genes for resistance to leaf rust in 10 hard red spring wheat and, (ii) confirm their postulated resistance genotypes by crossing them with appropriate leaf rust (LR) near-isogenic line(s). Both phases of the study were based on leaf rust reactions of wheat seedlings in the greenhouse. Postulated resistance genotypes confirmed by the genetic study were: ‘Glenlea’ contained Lrl; ‘Era’ contained LrlO; ‘Alex’, ‘James‘, and ‘Waldron‘ contained Lr2a and LrlO; ‘Guard’ and ‘Marshall’ contained Lr2a; and MN7529 contained LrlO and Lrl6. In addition, it was postulated that Guard, ‘Len’, and Marshall also contained LrlO and that MN7529 contained Lrl based on the infection-type data. The accuracy of postulated resistance genotypes indicates that infection-type data can be used with confidence in selecting parents for making crosses to develop new genetic combinations for resistance.

Received for publication November 7, 1987.