Repeated intercontinental migrations and recurring hybridizations characterise the evolutionary history of yew (Taxus L.)

文献类型： 外文期刊

第一作者： Moller, Michael

作者： Moller, Michael;Liu, Jie;Ye, Lin-Jiang;Li, De-Zhu;Gao, Lian-Ming;Liu, Jie;Ye, Lin-Jiang;Li, De-Zhu;Moller, Michael;Mill, Robert;Thomas, Philip;Li, Yan;Li, Jian-Hua;Ye, Lin-Jiang;Li, De-Zhu

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关键词： Ancestral area estimation; Biogeographic origin; Evolutionary history; Hybridization; Phylogenetic relationships; Vicariance

期刊名称：MOLECULAR PHYLOGENETICS AND EVOLUTION （ 影响因子：4.286； 五年影响因子：4.492 ）

ISSN： 1055-7903

年卷期： 2020 年 153 卷

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收录情况： SCI

摘要： The genus Taxus (Taxaceae) consists of 16 genetically well-defined lineages that are predominantly distributed across the Northern hemisphere. We investigated its biogeographic origin and evolutionary history by sampling 13 chloroplast gene sequences, the nuclear internal transcribed spacers (ITS) and NEEDLY sequences for all 16 lineages. We applied Maximum Parsimony and Bayesian Inference analyses to infer their phylogenetic relationships, time-calibrated phylogenies using BEAST and inferred the ancestral area of occupancy with BioGeoBEARS. We found strong evidence for the hybrid origin of three lineages and dated these events to a rather narrow time window of 6.8-4.9 million years ago (Mya). The dated phylogenies inferred an Upper Cretaceous origin of the genus, with the extant lineages diversifying in North America much later during the Oligocene/early Miocene. Repeated migrations via the Bering land bridge to Eurasia and back were further inferred, with the return to North America as a possible result of vicariance. The diversification in Eurasia (from similar to 8 Mya onwards) coincided with the orogeny of the Hengduan Mountains, the intensification of the East Asian summer monsoon and the occupancy of ecological niches by lineages that experienced secondary contacts and hybridizations in the Hengduan Mountains and Qinling Mountain, especially around the Sichuan basin. We provide a hypothesis for the evolution of extant lineages of Taxus, a genus with an old and complex evolutionary history. The study highlights that the history of complex species can be unravelled with a careful dissection of phylogenetic signals.

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