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  • Author or Editor: E. Budashkina x
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Transfer of genetic material from tetraploid species, Triticum timopheevii Zhuk, resistant to diseases into common wheat Triticum aestivum L. has been carried out. Six common wheat cultivars were used. The process of hybrid forms stabilization have been studied in details; identification of Triticum timopheevii genetic material in genome of introgressive lines (2n = 42) resistant to leaf rust (Puccinia triti- cina Erikss.) has been carried out. Donors of rust resistance have been developed and the genetic control of the character has been studied. The resistance of obtained lines has been shown to be due to Lr genes, non- allelic to effective Lr genes from world collection.

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A leaf rust resistance gene transferred from the tetraploid wheat Triticum timopheevii (Zhuk.) Zhuk. (genomic composition: A t A t GG) into common wheat Triticum aestivum L. conditioned resistance at the seedling and adult plant stages in the introgression line ‘line 842-2’. To determine chromosome location and to map the resistance gene an F 2 population from a cross between ‘line 842-2’ and susceptible wheat cultivar ‘Skala’ was developed and screened against leaf rust pathotype 77 ( Puccinia triticina Erikss.). Microsatellite markers detected introgressions of the T. timopheevii genome on chromosomes 1A, 2A, 2B, 5B and 6B of ‘line 842-2’. Linkage analysis revealed an association between leaf rust resistance and microsatellite markers located on chromosome 5B. The markers Xgwm880 and Xgwm1257 were closely linked to the resistance gene with genetic distances of 7.7 cM and 10.4 cM, respectively. Infection type tests with three leaf rust isolates resulted in different patterns of infection types of ‘line 842-2’ and ‘Thatcher’ near-isogenic line with the Lr18 gene on chromosome 5B. The data corroborated the hypothesis of the diversity of the resistance coming from T. timopheevii . The resistance gene of the introgression ‘line 842-2’ seems to be different than Lr18 and therefore it was designated LrTt2 .

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