Population Genetic Differentiation and Taxonomy of Three Closely Related Species of Saxifraga (Saxifragaceae) from Southern Tibet and the Hengduan Mountins

	Population Genetic Differentiation and Taxonomy of Three Closely Related Species of Saxifraga (Saxifragaceae) from Southern Tibet and the Hengduan Mountins
	Jia, Liu-Kun 1,2; Gao, Qing-Bo 2,4; Gornall, Richard J.3; Wang, Jiu-Li 1,2; Liu, Hai-Rui 1,2; Chen, Shi-Long2 ; Gengji, Zhuo-Ma 1,2; Li, Yan 1,2
刊名	FRONTIERS IN PLANT SCIENCE
	2017-07-28
卷号	8
关键词	Saxifraga the Hengduan Mountains allopatric speciation vicariance taxonomic suggestion
英文摘要	The effects of rapid, recent uplift of the Hengduan Mountains on evolution and diversification of young floristic lineages still remain unclear. Here, we investigate diversification of three closely related Saxifraga species with a distribution restricted to the Hengduan Mountains (HM) and southern Tibet, and comment on their taxonomy based on molecular evidence. Three chloroplast DNA fragments (rbcL, trnL-F, trnS-G) and the nuclear ribosomal DNA internal transcribed spacer (ITS) were employed to study genetic structure across 104 individuals from 12 populations of Saxifraga umbellulata, S. pasumensis, and S. banmaensis. Chloroplast DNA (cpDNA) phylogenies revealed two well supported clades, corresponding to S. umbellulata and S. pasumensis plus S. banmaensis. Topology of the ITS phylogeny was largely congruent with that generated from cpDNA haplotypes, but with minor conflicts which might be caused by incomplete lineage sorting. Analyses of molecular variance of both cpDNA and ITS datasets revealed that most variation was held between S. pasumensis s. l. (with S. banmaensis) and S. umbellulata (92.31% for cpDNA; 69.78% for ITS), suggesting a high degree of genetic divergence between them. Molecular clock analysis based on ITS dataset suggested that the divergence between S. pasumensis s. l. and S. umbellulata can be dated to 8.50 Ma, probably a result of vicariant allopatric diversification associated with the uplift events of the HM. Vicariance associated with HM uplifts may also have been responsible for infraspecific differentiation in S. pasumensis. In contrast, infraspecific differentiation in S. umbellulata was most likely triggered by Quaternary glaciations. The much lower levels of gene diversity within populations of S. pasumensis compared with S. umbellulata could have resulted from both range contractions and human collection on account of its putative medicinal properties. Combining evidence from morphology, geographical distributions and molecular phylogenetic data, we recommend that S. banmaensis should be treated as a synonym of S. pasumensis which in turn, and based on the same sources of evidence, should be treated as a separate species rather than as a variety of S. umbellulata.
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
类目[WOS]	Plant Sciences
研究领域[WOS]	Plant Sciences
关键词[WOS]	BAYESIAN PHYLOGENETIC INFERENCE ; HABITAT FRAGMENTATION ; BIODIVERSITY HOTSPOT ; PLANT DIVERSIFICATION ; MOLECULAR DIVERSITY ; DNA POLYMORPHISM ; CHLOROPLAST DNA ; RANGE EXPANSION ; CLIMATE-CHANGE ; PLATEAU
收录类别	SCI
语种	英语
WOS记录号	WOS:000406627000001
内容类型	期刊论文
源URL	[http://ir.nwipb.ac.cn/handle/363003/9786]
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
作者单位	1.Univ Chinese Acad Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining, Qinghai, Peoples R China 3.Univ Leicester, Dept Genet, Leicester, Leics, England 4.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Crop Mol Breeding Qinghai Prov, Xining, Qinghai, Peoples R China
推荐引用方式 GB/T 7714	Jia, Liu-Kun,Gao, Qing-Bo,Gornall, Richard J.,et al. Population Genetic Differentiation and Taxonomy of Three Closely Related Species of Saxifraga (Saxifragaceae) from Southern Tibet and the Hengduan Mountins[J]. FRONTIERS IN PLANT SCIENCE,2017,8.
APA	Jia, Liu-Kun.,Gao, Qing-Bo.,Gornall, Richard J..,Wang, Jiu-Li.,Liu, Hai-Rui.,...&Li, Yan.(2017).Population Genetic Differentiation and Taxonomy of Three Closely Related Species of Saxifraga (Saxifragaceae) from Southern Tibet and the Hengduan Mountins.FRONTIERS IN PLANT SCIENCE,8.
MLA	Jia, Liu-Kun,et al."Population Genetic Differentiation and Taxonomy of Three Closely Related Species of Saxifraga (Saxifragaceae) from Southern Tibet and the Hengduan Mountins".FRONTIERS IN PLANT SCIENCE 8(2017).