Stem Rust Resistance Gene from Triumph 64 Identified in Four Other Winter Wheats. D. V. McVey, Research Plant Pathologist, Cereal Rust Laboratory, USDA, ARS, St. Paul, MN 55108. K. Hamilton, Research Technician, Cereal Rust Laboratory, USDA, ARS, St. Paul, MN 55108. Plant Dis. 69:217-218. Accepted for publication 27 August 1984. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1985. DOI: 10.1094/PD-69-217.

Five Triticum aestivum cultivars from the International Winter Wheat Performance Nurseries I through XII gave similar infection type patterns when tested with 28 isolates of wheat stem rust (Puccinia graminis f. sp. tritici). The crosses Triumph 64/Martonvasari 5, Parker/Martonvasari 5, and Triumph 64/Parker were made. Genetic analysis of three F₂ progenies tested to P. graminis isolate RTQ (72-00-53A) showed that a resistance gene tentatively designated SrTmp in Triumph 64 was also present in Martonvasari 5 and Parker. Similarity of infection types of Mironovskaya 808 and Fertodi 293 with the other three cultivars strongly suggests they also have SrTmp. Although SrTmp is widely distributed (United States, Russia, and Hungary), it occurs in very few cultivars. It provides an intermediate level of resistance to all races of P. graminis in North America except race 15-TNM and some isolates of race 56-MBC.

Keyword(s): wheat stem rust resistance.