Population subdivision and hybridization in a species complex of Gentiana in the Qinghai-Tibetan Plateau

NWIPB OpenIR

	Population subdivision and hybridization in a species complex of Gentiana in the Qinghai-Tibetan Plateau
	Fu, Peng-Cheng; Sun, Shan-Shan; Khan, Gulzar; Dong, Xiao-Xia; Tan, Jin-Zhou; Favre, Adrien; Zhang, Fa-Qi; Chen, Shi-Long
	2020
发表期刊	ANNALS OF BOTANY
卷号	125 期号:4
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.
关键词	Contact zones evolutionary history hybridization Gentiana Qinghai-Tibetan Plateau refugia
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/60387
专题	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).