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Gene K1 of Raja Flax: A New Factor for Resistance to Rust. J. A. Hoes, Plant pathologist, Agriculture Canada, Research Station, Morden, Manitoba, Canada R0G 1J0; E. O. Kenaschuk, flax breeder, Agriculture Canada, Research Station, Morden, Manitoba, Canada R0G 1J0. Phytopathology 76:1043-1045. Accepted for publication 14 April 1986. Copyright 1986 Department of Agriculture, Government of Canada. DOI: 10.1094/Phyto-76-1043.

The reactions to selected races of Melampsora lini of F1, F2, F3, and testcross progenies of crosses between the flax cultivar Raja with the universal suscept Bison and five single-gene differentials (K, L6, M3, N1, and P3) indicated that the resistance of Raja is monogenic, dominant, and is an allele at the K locus. The gene, designated K1, is new and conditions resistance to all races of flax rust in North America. F2 segregation data indicate that genes K1 and N1 are linked, with an estimated recombination percentage of 25%. Indications are that the K, N, and P loci, in the order indicated, are carried in the same chromosome. Gene K1 appears to be derived from Argentine Selection 1025.

Additional keywords: Linum usitatissimum.