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Screening of Flax Species for New Sources of Genes Resistant to Melampsora lint (Ehrenb.) Lev.¹

The control of rust (Melampsora lini (Ehrenb.) Lev.) in flax (Linum usitatissimum L.) has been by development of rust resistant cultivars. Because genes for rust resistance are continually being rendered ineffective by new races of rust, the isolation of new genes is essential.

Hybridization of the common flax cultivar ‘Bison’ was attempted with available species of flax with chromosome numbers of n = 15. Ten accessions representing four successfully hybridized species were immune to cultures of race 371. Of these, two were immune to all known races of rust in North and South America. Inv munity of each of these accessions was conditioned by a single gene located at or near the L locus. Because the genes for rust resistance were both found at the L locus and both conditioned immunity to all known North and South American races of rust, it was impossible to determine if they were the same or different alleles located at the same locus. These genes have not been reported previously in the literature, and we propose to designate them L¹²-l and L¹²-2.

Key Words: Flax • Flax rust • Rust resistance • Linseed

² Graduate research assistant and associate professor of agronomy, respectively, Agronomy Dep., North Dakota State Univ., Fargo, ND 58102.

Received for publication February 14, 1977.