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Resistance to Leaf Rust in Hexaploid Wheat: Lr32 a Third Gene Derived from Triticum tauschii¹

The wild relatives of hexaploid wheat (Triticum aestivum L.) are important sources of new genes for the improvement and diversification of resistance to leaf rust (Puccinia recondita Rob. ex. Desm.) in common wheat breeding. Resistance to this pathogen was transferred to hexaploid wheat from accession RL5497-1 of the diploid progenitor Triticum tauschii (Coss.) SchmaL Inheritance studies the diploid and hexaploid levels indicated that one gene conferred resistance to a wide spectrum of rust cultures. Resistance in the diploid was partially dominant while at the hexaploid level it appeared to be either partially dominant or recessive, depending on environmental conditions. The degree of seedling resistance, as indicated by infection type, was somewhat less in the hexaploid than in the diploid. This newly identified gene, designated Lr32, is located on chromosome 3D and, therefore, is different from the seedling resistance gene Lr21, previously transferred to common wheat from T. tauschii, and also different from Lr24, known to be on 3D but derived from Agropyron.

Key Words: Triticum aestivum L. • Puccinia recondita Rob. ex. Desm. • Monosomic

² Research scientist, Res. Stn., Res. Branch, Agriculture Canada, 195 Dafoe Road, Winnipeg, Manitoba R3T 2M9.

Received for publication April 10, 1986.

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