Phylogeny of the a genomes of wild and cultivated wheat species |
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Authors: | K A Golovnina E Ya Kondratenko A G Blinov N P Goncharov |
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Institution: | 1.Institute of Cytology and Genetics, Siberian Branch,Russian Academy of Sciences,Novosibirsk,Russia |
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Abstract: | Diploid species of the genus Triticum L. are its most ancient representatives and have the A genome, which was more recently inherited by all polyploid species.
Studies of the phylogenetic relationships among diploid and polyploid wheat species help to identify the donors of elementary
genomes and to examine the species specificity of genomes. In this study, molecular analysis of the variable sequences of
three nuclear genes (Acc-1, Pgk-1, and Vrn-1) was performed for wild and cultivated wheat species, including both diploids and polyploids. Based on the sequence variations
found in the genes, clear differences were observed among elementary genomes, but almost no polymorphism was detected within
each genome in polyploids. At the same time, the regions of the three genes proved to be rather heterogeneous in the diploid
species Triticum boeoticum Boiss., T. urartu Thum. ex Gandil., and T. monococcum L., thus representing mixed populations. A genome variant identical to the A genome of polyploid species was observed only
in T. urartu. Species-specific molecular markers discriminating the diploid species were not found. Analysis of the inheritance of morphological
characters also failed to identify a species-specific character for the three diploid wheat species apart from the hairy leaf
blade type, described previously. |
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