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Flax Cultivars with multiple Rust-conditioning Genes¹

Lines of seed.flax (Linum usitatissimum L.), each with a different gene for rust resistance, were developed by backcrossing to the cultivar ‘Bison.’ The monogenic Bison-like lines were intercrossed to provide two-gene segregates. Intercrossing two-gene lines, with one gene in comtnon, develnped three-gene lines. The selective pathogenicity of races of Melampsora lini (Ehrenb.) Lev., was utilized to identify plants that possessed the parental resistance genes. In a 3-year trim (1966–1968) at Fargo, North Dakota, yield differences between 20 multiplegene cultivars and five commercial cultivars were not significant. Most of the experimntal cultivars would be satisfactory for commercial production.

Key Words: Melampsora lini • Linum usitatissimum • Backcross • Epidemiology • Yield evaluation

² Research Plant Pathologist, Crops Research Division, ARS, USDA, and Professor, Department of Plant Pathology, North Dakota State University, Fargo, N. D. 58102; and Leader, Flax Investigations, Crops Research Division, ARS, USDA, and Associate Professor, Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minn. 55101.

Received for publication June 12, 1970.