Identification of complementary genes of hybrid lethality in crosses of bread wheat and rye. Results and perspectives

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Abstract


Numerous genes were found in crop plants, leading to death or sterility of distant hybrids. However, the evolutionary role of concrete genes in the reproductive isolation of the species remains unclear. The article summarizes the own data for identification of hybrid lethality genes that were detected in wheat -rye crosses. Seeds with the dead, undifferentiated embryo and normal endosperm were found in crosses of bread wheat with four out of a hundred studied inbred lines of rye. It is shown that the hybrid lethality is a consequence of the negative complementary interaction of genes of wheat and rye. Rye gene Eml-1R is represented by two alleles - dominant incompatible and recessive compatible. It was mapped on chromosome 6R relative microsatellite and isozyme loci. Complementary wheat gene Eml-1A is located on chromosome 6A. Location of interacting genes on syntenic fragments of chromosomes 6R and 6A may indicate gomeology of hybrid lethality genes in wheat and rye. However, embryonic lethality observed in individual wheat-rye hybrids, cannot be attributed to the evolutionary developed intergeneric incompatibility, like a well-studied prezygotic incompatibility of wheat and related genera.

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About the authors

Natalia Dmitrievna Tikhenko

St Petersburg Branch Russian Academy of Sciences, Vavilov Institute of General Genetics

Email: tikhenko@mail.ru
senior researcher, Dr. Biol. Sci., Laboratory of Genetics and Plant Biotechnology

Natalia Vladimirovna Tsvetkova

Saint Petersburg State University

Email: ntsvetkova@mai.ru
research scientist, PhD, Department of Genetics and Biotechnology

Anna Nikolaevna Lyholay

Saint Petersburg State University

Email: lankira@mail.ru
Junior Researcher, Department of Genetics and Biotechnology

Anatoly Vasilievich Voylokov

St Petersburg Branch Russian Academy of Sciences, Vavilov Institute of General Genetics

Email: av_voylokov@mail.ru
Head of the Laboratory, Dr.Biol.Sci., Laboratory of Genetics and Plant Biotechnology

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Copyright (c) 2015 Tikhenko N.D., Tsvetkova N.V., Lyholay A.N., Voylokov A.V.

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