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Reaction of 578 Spring Spelt Wheat Accessions to 35 Races of Wheat Stem Rust

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

^* Corresponding author.

A survey of spelt wheat accessions (Triticum aestivum ssp. spelta L.) was made to characterize their reactions to stem rust (Puccinia graminis Rob. ex Desm. f. sp. tritici). Spelt wheat genotypes cross readily with bread wheat (Triticum aestivum L.) and could be used as donor parents in bread wheat breeding programs. Because of the paucity of information on their reaction to stem rust in the literature, the objectives of this study were to: (i) screen spelt accessions for possible new sources of resistance to wheat stem rust, and (ii) postulate and confirm the presence of known genes for resistance to stem rust. Infection-type data from seedlings artificially infected with stem rust were used to postulate Sr genes present in 578 spring spelt accessions from the USDA National Small Grain Collection. Conventional genetic studies were used to confirm the hypothetical resistance genotypes derived from infection-type data. Genetic studies confirmed the presence of postulated genes for resistance Sr9e, Sr9f, Sr18, SrLC, and SrMcN; Sr9g was absent. Other genes for resistance postulated to be present included Sr9a, Sr9d, Srl0, Sr15, Sr17, Srl9, and Sr20. Infection-type data proved the absence of Sr5, Sr6, Sr8a, Sr9b, Sr11, Sr13, Sr14, Sr16, Sr24, Sr25, Sr26, Sr29, Sr36, and SrTmp in these spelt accessions. Several unidentified genes that were postulated to be present may provide useful levels of resistance when transferred in combinations to bread wheat.

Received for publication March 23, 1989.