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Chloroplast DNA non-coding sequences variation in Aegilops tauschii Coss.: evolutionary history of the species

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Abstract

Sequences of four chloroplast DNA non-coding regions, about 3,000 bp in total, were analysed in 112 Aegilops tauschii accessions, 56 of ssp. tauschii and 56 of ssp. strangulata, representing all of the species range. One inversion, 8 insertions/deletions, 18 base pair substitutions and 5 microsatellite loci were found. The data revealed that Ae. tauschii originated in Caucasia. Neither of the two Ae. tauschii subspecies was an ancestor to one another. Aegilops tauschii divided into ssp. tauschii and ssp. strangulata at the very beginning of its existence as a species. Subspecies tauschii was the first to start geographic expansion and relatively rapidly occupied a vast area from Caucasia—eastward up to central Tien Shan and western Himalayas. In contrast to ssp. tauschii, geographic spread of ssp. strangulata was a complicated, multi-stage and slow process. At the beginning of ssp. strangulata evolutionary history its major phylogenetic lineage for a lengthy time span had existed as a small isolated population. Several forms of ssp. strangulata, better adapted to relatively moister and cooler habitats, had originated. Each of these forms has gradually forced out ssp. tauschii from some part of its area in the west, up to central Kopet-Dag.

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Acknowledgments

I would like to express my sincere gratitude to Miss. Rinata R. Husainova and Dr. Oleg V. Vaulin for the help in the course of this study. I am also very grateful to Prof. Sasa Stefanovic for useful discussion. And I wish to thank Mrs. Holly Griesbach for refining the English of the paper.

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  1. Institute of Cytology and Genetics, 630090, Novosibirsk, Russia

    Alexander Ju. Dudnikov

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Correspondence to Alexander Ju. Dudnikov.

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Dudnikov, A.J. Chloroplast DNA non-coding sequences variation in Aegilops tauschii Coss.: evolutionary history of the species. Genet Resour Crop Evol 59, 683–699 (2012). https://doi.org/10.1007/s10722-011-9711-8

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