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Near-Isogenic Lines of Wheat with Genes for Resistance to Erysiphe graminis f. sp. tritici¹

Twelve near-isogenic lines of wheat, Triticum aestivum L. em Thell. (aestivum group), each with a gene for resistance to Erysiphe graminis DC. ex Merat f. sp. trltici Em. Marchal, have been developed through a backcrossing program. Some have identical genes, but at least four different loci are represented. Those lines that represent genes for resistance at different loci, or different alleles al: any one locus, may be used as differentials in identification of cultures of the powdery mildew fungus. They are also well-suited for critical genetic studies involving resistance to E. graminis tritici, and for research directed toward learning more about the nature of disease development.

Key Words: Powdery mildew • Differentials

² Research Agronomist, Crops Research Division, ARS, USDA, Beltsville, Md. 20705.

Received for publication July 15, 1968.