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题名: Chloroplast phylogeny and phylogeography of Stellera chamaejasme on the Qinghai-Tibet Plateau and in adjacent regions
作者: Zhang, Yong-Hong1; Volis, Sergei2; Sun Hang(孙航)1
刊名: MOLECULAR PHYLOGENETICS AND EVOLUTION
关键词: Stellera chamaejasme ; Phylogeny ; Phylogeography ; Qinghai-Tibet Plateau ; Refugium ; Post-glacial expansion
英文摘要: Historic events such as the uplift of Qinghai-Tibet Plateau (Q-T Plateau) and climatic oscillations in the Quaternary period greatly affected the evolution and modern distribution of Sino-Tibetan flora. Stellera chamaejasme, a perennial herb with flower color polymorphism that is distributed from the mountainous southeastern Q-T Plateau (Hengduan Mountains, H-D Mountains) to the vast platform of the Q-T Plateau and the adjacent plain of northern China, provides an excellent model to explore the effects of historic events on the origination and variation of species. In this study, we conducted a phylogenetic and phylogeographical study using three chloroplast sequences (trnT-L, trnL-F and rpL16) in 26 populations of S. chamaejasme and 12 outgroups from the Thymeleaceae. Phylogenetic analysis and molecular clock estimation revealed that the monophyletic origin of S. chamaejasme occurred ca. 6.5892 Ma, which is consistent with the radical environment changes caused by the rapid uplift of the Q-T Plateau ca. 7 Ma. Intra-specific differentiation of S. chamaejasme is estimated to have occurred after ca. 2.1 Ma. Twelve haplotypes were revealed from combined trnL-F and rpL16 sequences. High genetic diversity (h(T)=0.834) and population differentiation (N-ST = 0.997 and G(ST) = 0.982) imply restricted gene flow among populations and significant geographical or environmental isolation. All populations from the vast plain of northern China were dominated by one haplotype (H1), and the same haplotype was fixed in most populations from the high elevation platform of the western and northern Q-T Plateau. In contrast, the majority of the haplotypes were found in the relatively narrow area of the H-D Mountains, in the southeastern distribution of S. chamaejasme. The contrasting haplotype distribution patterns suggested that the H-D Mountains were either a refugium for S. chamaejasme during the Quaternary climatic oscillations or a diversification center of this species. The present wide distribution of this species on the Q-T Plateau platform and in northern China is likely to have resulted from a rapid post-glacial population expansion from the southeastern refugium involving founder effects, facilitated by the adjacent geographic range with a similar grassland habitat. (C) 2010 Elsevier Inc. All rights reserved.
出版日期: 2010-12-01
卷号: 57, 期号:3, 页码:1162-1172
DOI标识: 10.1016/j.ympev.2010.08.033
语种: 英语
ISSN号: 1055-7903
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内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/3026
Appears in Collections:中国科学院东亚植物多样性与生物地理学重点实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Biodivers & Biogeog, Kunming 650204, Yunnan, Peoples R China
2.Ben Gurion Univ Negev, Dept Life Sci, IL-84105 Beer Sheva, Israel

Recommended Citation:
Zhang, YH; Volis, S; Sun, H.Chloroplast phylogeny and phylogeography of Stellera chamaejasme on the Qinghai-Tibet Plateau and in adjacent regions,MOLECULAR PHYLOGENETICS AND EVOLUTION,2010,57(3):1162-1172
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