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Assessment of Barley Accessions PI 382313, PI 382474, PI 382915, and PI 382976 for Stem Rust Resistance

Alberta Agriculture, Field Crops Branch, Bag Service #47, Lacombe, Alberta T0C 1S0

D. R. Metcalfe and J. W. Martens

Agriculture Canada Research Stn., 195 Dafoe Road, Winnipeg, Manitoba R3T 2M9

^* Corresponding author.

New sources of resistance to Puccinia graminis Pers. f. sp. tritici Erikss. and Henn. in barley(Hordeum vulgare L.) should be identified and incorporated into breeding programs to ensure the continued resistance of barley to this pathogen. The objective of this study was to identify resistance to stem rust in barley accessions from the USDA Wiebe collection and determine the relationship of this resistance to resistance conferred by the T gene. Four accessions, PI 382313, PI 382474, PI 382915, and PI 382976, were selected as having good field resistance at the Winnipeg Agriculture Canada Research Station, Glenlea rust nursery in 1986. The field resistance of these four accessions was reconfirmed in the 1987 rust nursery and was found to be as effective as, or more effective than, that conferred by T. Seedling and adult plant tests were conducted in controlled environments with six races (C5, C10,C 17,C 25,C 35, and C53). In seedling tests, PI 382313 was resistant or moderately resistant to all six races. Both PI 382474 and PI 382915 were moderately susceptible to C35 and susceptible to the other five races. The PI 382976 was moderately resistant to C35 and C53, and moderately susceptible or susceptible to the other races. In adult plant tests, PI 382474 was resistant to C35 and PI 382313 was resistant to C17. Both PI 382915 and PI 382979 displayed little resistance as adults to the six races. Genetics studies with PI 382313 indicated that the field resistance of this accession was conferred by a single dominant gene that was different from T.

Received for publication December 12, 1988.

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