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Probable Genes for Leaf Rust Resistance in Several Hard Red Spring Wheats¹

Reaction to different Puccinia recondita f. sp. tritici cultures was used to determine probable genotypes for seedling resistance in several hard spring wheat (Triticum aestivum L.) cultivars grown in North Dakota. Many of the cultivars studied can be combined into groups on the basis of sharing the same genes for resistance. Several cultivars probably have Lr2a and/or Lrl0 and a few contained Lrl. It is likely that most of these cultivars have genes in addition to those determined by this method as well as genes for adult plant resistance.

Key Words: Selective pathogenecity • Probable genotypes • Gene identification • Infection-type Data • Comparative Infection Type

² Professor, Dep. of Plant Pathology, North Dakota State Univ., Fargo, ND 58105.

Received for publication July 8, 1983.