Population subdivision and hybridization in a species complex of Gentiana in the Qinghai-Tibetan Plateau
文献类型：期刊论文
| 作者 | Fu, Peng-Cheng; Sun, Shan-Shan; Khan, Gulzar; Dong, Xiao-Xia; Tan, Jin-Zhou; Favre, Adrien; Zhang, Fa-Qi; Chen, Shi-Long
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| 刊名 | ANNALS OF BOTANY
 |
| 出版日期 | 2020 |
| 卷号 | 125期号:4 |
| 关键词 | Contact zones evolutionary history hybridization Gentiana Qinghai-Tibetan Plateau refugia |
| 英文摘要 | Background and Aims Hosting several global biodiversity hotspots, the region of the Qinghai-Tibetan Plateau (QTP) is exceptionally species-rich and harbours a remarkable level of endemism. Yet, despite a growing number of studies, factors fostering divergence. speciation and ultimately diversity remain poorly understood for QTP alpine plants. This is particularly the case for the role of hybridization. Here, we explored the evolutionary history of three closely related Gentiana endemic species, and tested whether our results supported the mountain geobiodiversity hypothesis (MGH). Methods We genotyped 69 populations across the QTP with one chloroplast marker and 12 nuclear microsatellite loci. We performed phylogeographical analysis, Bayesian clustering, approximate Bayesian computation and principal components analysis to explore their genetic relationship and evolutionary history. In addition, we modelled their distribution under different climates. Key Results Each species was composed of two geographically distinct clades, corresponding to the south-eastern and north-western parts of their distribution. Thus Gentiana veitchiorum and G. lawrencei var. farreri, which diverged recently, appear to have shared at least refugia in the past. from which their range expanded later on. Indeed, climatic niche modelling showed that both species went through continuous expansion from the Last Interglacial Maximum to the present day. Moreover, we have evidence of hybridization in the northwest clads of G. lawrencei var. farreri, which probably occurred in the refugium located on the plateau platform. Furthermore. phylogenetic and population genetic analyses suggested that G. dolichocalyx should be a geographically limited distinct species with low genetic differentiation from G. lawrencei var.farreri. Conclusions Climatic fluctuations in the region of the QTP have played an important role in shaping the current genetic structure of G. lawrencei var. farreri and G. veitchiorum. We argue that a species pump effect did occur prior to the Last Interglacial Maximum, thus lending support to the MGH. However, our results do depart from expectations as suggested in the MGH for more recent distribution range and hybridization dynamics. |
| 源URL | [http://210.75.249.4/handle/363003/60387]  |
| 专题 | 西北高原生物研究所_中国科学院西北高原生物研究所 |
| 推荐引用方式 GB/T 7714 | Fu, Peng-Cheng,Sun, Shan-Shan,Khan, Gulzar,et al. Population subdivision and hybridization in a species complex of Gentiana in the Qinghai-Tibetan Plateau[J]. ANNALS OF BOTANY,2020,125(4). |
| APA | Fu, Peng-Cheng.,Sun, Shan-Shan.,Khan, Gulzar.,Dong, Xiao-Xia.,Tan, Jin-Zhou.,...&Chen, Shi-Long.(2020).Population subdivision and hybridization in a species complex of Gentiana in the Qinghai-Tibetan Plateau.ANNALS OF BOTANY,125(4). |
| MLA | Fu, Peng-Cheng,et al."Population subdivision and hybridization in a species complex of Gentiana in the Qinghai-Tibetan Plateau".ANNALS OF BOTANY 125.4(2020). |
入库方式： OAI收割
来源：西北高原生物研究所
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