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Two rye genes responsible for abnormal development of wheat–rye hybrids are linked in the vicinity of an evolutionary translocation on chromosome 6R

Department of Genetics and Biotechnology, St. Petersburg State University, Universiteskaya nab.7/9, St. Petersburg 199034, Russia
Tsvetkova, Natalia V.;
Vavilov Institute of General Genetics Russian Academy of Sciences, St. Petersburg Branch, Universiteskaya nab.7/9, St. Petersburg 199034, Russia
Tikhenko, Natalia D.;
Julius Kühn-Institute (JKI), Institute for Breeding Research on Agricultural Crops, Germany
Hackauf, Bernd;
Leibnitz Institute of Plant Genetics and Crop Plant Research, Corrensstrasse 3, Stadt Seeland OT, D-06466 Gatersleben, Germany
Voylokov, Anatoly V.

The post-zygotic reproductive isolation (RI) in plants is frequently based on the negative interaction of the parental genes involved in plant development. Of special interest is the study of such types of interactions in crop plants, because of the importance of distant hybridization in plant breeding. This study is devoted to map rye genes that are incompatible with wheat, determining the development of the shoot apical meristem in wheat–rye hybrids. Linkage analysis of microsatellite loci, as well as genes of embryo lethality (Eml-R1) and hybrid dwarfness (Hdw-R1) was carried out in hybrids of Chinese Spring wheat with recombinant inbred lines as well as interline rye hybrids. Eml-R1 and Hdw-R1 could be mapped proximal and distal of two closely linked EST-SSR markers, Xgrm902 and Xgrm959, on rye chromosome 6R. Both rye genes are located on a segment of chromosome 6R that contains a breakpoint of evolutionary translocation between the ancestral chromosomes of homeologous groups 6 and 3. The obtained results are discussed in relation to genes interacting in developmental pathways as a class of causal genes of RI.


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