@ARTICLE{TreeBASE2Ref25725, author = {Polina A. Volkova and Tobias Herden and Nikolai Friesen}, title = {Genetic variation of Goniolimon speciosum reveals complex history of steppe vegetation.}, year = {2016}, keywords = {divergence time estimates, Goniolimon, Eurasian steppe formation, historical biogeography, phylogeny }, doi = {}, url = {http://}, pmid = {}, journal = {Organisms Diversity & Evolution}, volume = {}, number = {}, pages = {}, abstract = {We hypothesised that the spatial pattern of genetic variation in different ecological groups of steppe plant species is not similar. To test this hypothesis we studied genetic variation of the typical steppe plant Goniolimon speciosum (Limoniaceae), which is spread across the whole of the Asian steppe, and compared it with the published data on genetic variation of several mountain-steppe species. To elucidate the phylogeny of G. speciosum, we sequenced the nuclear ribosomal ITS and plastid trnH-psbA and trnQ-rps16 regions. Goniolimon speciosum was shown to have originated in Central Asia in the Pliocene. We revealed two genetic groups within G. speciosum ? south-eastern (Dahuria, north-eastern Mongolia, southern shore of the lake Baikal and eastern Tyva) group and another ? broadly distributed ?western? group. This split of evolutionary lineages is estimated to have occurred in the middle of the Pliocene. Some samples from the central part of the species area (riverheads of Yenisei and Ob) formed an intermediate genetic group, where most plants had ?western? ITS ribotypes and ?south-eastern? plastid haplotypes. This polyphyletic group could have originated due to multiply secondary contacts and subsequent hybridisation events. The geographically structured genetic subdivision of the western lineage, based on the ITS data, indicates multiple northward colonisations of G. speciosum from Central Asia that occurred, according to our estimates, in the early Pleistocene. Thus, the history of steppe vegetation is more complicated than has been previously suggested, basing upon limited taxonomical sampling of steppe plants. Species with different ecological preferences have a different history.} }

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