The genetic control of leaf rust resistance has been investigated by test crosses and the test-clone method in the rye accessions Malysh 72-2, Chulpan 3, Immunnaya 4, Yaroslavna 3, Lovashpatonae 2, Gotor 2, Talovskaya 12-2, Braunrostresisten 2, Orlovskaya 9-2, 3098/18, and 4001/10. It has been found that this trait is controlled by a set of nonidentical oligogenes. Dominant geneLr6 controls leaf rust resistance in Chulpan 3 and Immunnaya 4;Lr5, in Malysh 72-2; and Lr-c, in Yaroslavna 3. Test crosses have shown that genesLr-a and Lr-bdiffer from the genes determining the resistance in Gotor 2 and Braunrostresisten 2. In German accessions 4001/10 and 3098/18, the resistance to the Petersburg population of the pathogen is controlled by nonallelic genes Lr-a andLr-b. It has been found that gene Lr-b is not identical to the resistance gene of Lovashpatonae 2, and Lr-a is not identical to Lr-c.In all accessions, resistance to the leaf rust population is controlled by dominant genes from the stage of seedlings till maturity. Highly efficient Lr genes are present in the accessions Malysh 72-2, Chulpan 3, Immunnaya 4, Yaroslavna 3, Lovashpatonae 2, Gotor 2, Talovskaya 12-2, 3098/18, and 4001/10. In addition to the oligogenes, most accessions possess genes efficiently controlling particular clones of the pathogen.
Russian Journal of Genetics – Springer Journals
Published: Oct 13, 2004
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