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Cultures with selective pathogenicity were developed through hybridization or selfing to identify genes for resistance in flax (Linum usitatissimum L.) to flax rust [Melampsora lini (Ehrenb.) Lev). Selected races of M. lint were crossed and selfed to produce virulent patterns to identify combinations of resistance alleles L11, M3, M6, and P3 relatively simple.
Key Words: Flax rust Selective mutation pathogenicity Hybridization Gene identification Linum usitatissimum L.
2 Professor, Dep. of Plant Pathology, professor, Dep. of Agronomy, North Dakota State Univ., Fargo, ND 58105, and former research plant pathologist, AR, SEA, and USDA, Fargo, ND. Current address of junior author: AR-SEA-USDA, Richard B. Russell Agric. Res. Ctr., Athens, GA 3061S.
Received for publication July 21, 1980.
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