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Published in Crop Sci 12:800-804 (1972)
© 1972 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Identification of Rust-Conditioning Genes in Flax Cultivars1

H. H. Flor and V. E. Comstock2

The selective pathogenicity of races of Melampsora lini (Ehrenb.) Lev. was utilized to identify rust-conditioning genes in cultivars of flax (Linum usitatissimum L.). New rust-resistant cultivars developed for commercial production possessed the rust-conditioning genes expected based on knowledge of their parents. A heretofore-unknown gene, designated L11, was identified in ‘Linore,’ a cultivar of unknown parentage. This gene conditions resistance to all North American races of rust. Tests of several hundred cultivars of foreign origin revealed that most introductions are heterogenious for rust reaction.

Key Words: Melampsora lini • Linum usitatissimum • Pathogenicity

1 Contribution from the North Central Region, ARS, USDA, and the Minnesota and North Dakota Agricultural Experiment Stations. The screening of new accessions for genes for rust reaction was supported in part by a grant from the Flax Development Committee of the Flax Institute of the United States.

2 Collaborator and Research Agronomist, NCR, ARS, USDA, respectively, headquartered at Fargo, N.D. 58102 and St. Paul, Minn. 55101, respectively.

Received for publication March 15, 1972.




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