Phylogeography of Sophora davidii (Leguminosae) across the "Tanaka-Kaiyong Line', an important phytogeographic boundary in Southwest China

	Phylogeography of Sophora davidii (Leguminosae) across the "Tanaka-Kaiyong Line', an important phytogeographic boundary in Southwest China
	Fan, Deng Mei 1,2; Yue, Ji Pei 1; Nie, Ze Long 1; Li, Zhi Min 3; Comes, Hans Peter 4; Sun, Hang1
通讯作者	Sun, H (reprint author), Chinese Acad Sci, Kunming Inst Bot, Key Lab Biodivers & Biogeog, Kunming 650204, Peoples R China. ; peter.comes@sbg.ac.at ; hsun@mail.kib.ac.cn
	2013-08-01
发表期刊	MOLECULAR ECOLOGY
ISSN	0962-1083
卷号	22 期号:16 页码:4270-4288
摘要	The 'Tanaka-Kaiyong Line' (TKL) is a major phytogeographic boundary in Southwest China, separating East Asia's Sino-Himalayan and Sino-Japanese Floras. However, little is known about the importance of this boundary in promoting intraspecific phylogeographic subdivision and divergence. Using chloroplast (cpDNA) and nuclear-intron (nDNA) sequence data, we reconstructed the population history of Sophora davidii, a drought-tolerant riparian shrub widely distributed on either side of the TKL. Specifically, we aimed at testing two long-standing explanations for possible vicariant events across the TKL: (i) Late Pliocene (c. 3 Ma) geological uplift of the eastern Qinghai-Tibetan Plateau (QTP) or (ii) a sharp environmental gradient associated with the establishment of different monsoon regimes on either side of the TKL during the (Late) Pleistocene. Our genealogical analyses detected a major west-east split in cpDNA, geographically largely consistent with the TKL, and dated to c. 1.28 Ma (95% HPD: 0.21-2.96 Ma), hence postdating the latest phase of eastern QTP uplift. Furthermore, integrating cpDNA phylogeographic patterns with mismatch analyses, we found multiple refugial isolation and long-term demographic stability of populations in the west (Hengduan Mountain Range) compared with extensive range expansions in the east, possibly during the last glacial period(s) and followed by differentiation into regional sublineages (southeast: Yunnan-Guizhou Plateau vs. northeast: Qinling Mts./ Loess Plateau). Although nuclear differentiation was less marked, the geographical pattern of nDNA haplotypes provided some further indication of the species' eastward expansion, possibly from source populations located just east of the TKL (lower Jinshajiang region). Overall, the present data reject the geological (tectonic) explanation for the TKL and, instead, provide supportive evidence for its role as a climatically driven barrier to present-day plant dispersal. In addition, our study highlights changing temperatures and vegetation types during the last glacial period(s), along with aspects of regional topography, to be important determinants of the glacial eastward expansion of S. davidii. In consequence, our study lends support to a 'glacial out-of-Hengduan Mts'. hypothesis for the xerophytic-riparian flora of Southwest China, which in turn is inconsistent with the traditional view of theTKLas a 'classical' vicariant-biogeographic boundary.
关键词	China Chloroplast Dna Nuclear Dna Phylogeography Sophora Davidii Tanaka-kaiyong Line
学科领域	Biochemistry & Molecular Biology ; Ecology ; Evolutionary Biology
收录类别	SCI
语种	英语
WOS记录号	WOS:000322886400011
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/16807
专题	中国科学院东亚植物多样性与生物地理学重点实验室
作者单位	1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Biodivers & Biogeog, Kunming 650204, Peoples R China 2.Jiangxi Agr Univ, Lab Subtrop Biodivers, Nanchang 330045, Jiangxi, Peoples R China 3.Yunnan Normal Univ, Sch Life Sci, Kunming 650092, Yunnan, Peoples R China 4.Salzburg Univ, Dept Organism Biol, A-5020 Salzburg, Austria
推荐引用方式 GB/T 7714	Fan, Deng Mei,Yue, Ji Pei,Nie, Ze Long,et al. Phylogeography of Sophora davidii (Leguminosae) across the "Tanaka-Kaiyong Line', an important phytogeographic boundary in Southwest China[J]. MOLECULAR ECOLOGY,2013,22(16):4270-4288.
APA	Fan, Deng Mei,Yue, Ji Pei,Nie, Ze Long,Li, Zhi Min,Comes, Hans Peter,&Sun, Hang.(2013).Phylogeography of Sophora davidii (Leguminosae) across the "Tanaka-Kaiyong Line', an important phytogeographic boundary in Southwest China.MOLECULAR ECOLOGY,22(16),4270-4288.
MLA	Fan, Deng Mei,et al."Phylogeography of Sophora davidii (Leguminosae) across the "Tanaka-Kaiyong Line', an important phytogeographic boundary in Southwest China".MOLECULAR ECOLOGY 22.16(2013):4270-4288.

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