Molecular phylogeny of Solms-laubachia (Brassicaceae) s.l., based on multiple nuclear and plastid DNA sequences, and its biogeographic implications

doi:10.1111/j.1759-6831.2009.00041.x

	Molecular phylogeny of Solms-laubachia (Brassicaceae) s.l., based on multiple nuclear and plastid DNA sequences, and its biogeographic implications
	Yue, Ji-Pei 1,2; Sun, Hang2 ; Baum, David A.3; Li, Jian-Hua ; Al-Shehbaz, Ihsan A.4; Ree, Richard 1
通讯作者	rree@fieldmuseum.org
	2009-09-01
发表期刊	JOURNAL OF SYSTEMATICS AND EVOLUTION
ISSN	0529-1526
卷号	47 期号:5 页码:402-415
摘要	The Hengduan Mountains region of south-west China is a noted biodiversity hotspot, but the geographic origins and historical assembly of its rich endemic flora, including the sky-island species of Solms-laubachia Muschl. (Brassicaceae), have been little studied. Previous molecular studies on the phylogeny of Solms-laubachia showed it to be paraphyletic, leading to considerable expansion not only of its taxonomic limits, but also its geographic range, with the inclusion of taxa from outside the Hengduan region. However, these studies provided little resolution of interspecific relationships, preventing inferences about historical biogeography within the clade. In the present study, new sequence data from two nuclear genes (LEAFY and G3pdh) and two chloroplast intergenic spacers (petN-psbM and psbM-trnD) were combined with existing markers to increase phylogenetic signals. Phaeonychium villosum (Maxim.) Al-Shehbaz was found to be nested within Solms-laubachia s.l. In general, phylogenetic relationships appear to be a good predictor of geography, with the Hengduan Mountain endemics embedded in a paraphyletic grade of species from the western Himalayas and central Asia, but they also imply morphological homoplasy. Incongruence was detected between the nuclear and chloroplast gene trees, perhaps resulting from incomplete lineage sorting of ancestral polymorphisms. The crown age of Solms-laubachia s.l. was estimated to be approximately 1.42-3.68 mya, using Bayesian relaxed molecular clock analysis. Historical biogeographic analysis using a parametric dispersal-extinction-cladogenesis model inferred central Asia and the western Himalayas as most probable ancestral range of Solms-laubachia s.l., and estimated higher rates of eastward expansion than westward during the diversification of descendant lineages. In summary, our results suggest that Solms-laubachia s.l. originated during the Pliocene in central Asia, and subsequently migrated eastward into the Hengduan Mountains, colonizing sky-island, alpine scree-slope habitats that may have provided novel ecological opportunity and accelerated speciation, ultimately establishing this region as the present center of diversity of the genus.
关键词	Biogeography Brassicaceae Hengduan Mountains Phylogeny SolmS.l.ubachia S.l.
学科领域	Plant Sciences
DOI	10.1111/j.1759-6831.2009.00041.x
收录类别	SCI
语种	英语
WOS记录号	WOS:000270477800006
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/3008
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.Field Museum Nat Hist, Dept Bot, Chicago, IL 60605 USA 2.Chinese Acad Sci, Key Lab Biodivers & Biogeog, Kunming Inst Bot, Kunming 650204, Peoples R China 3.Univ Wisconsin, Dept Bot, Madison, WI 53706 USA 4.Missouri Bot Garden, St Louis, MO 63166 USA
推荐引用方式 GB/T 7714	Yue, Ji-Pei,Sun, Hang,Baum, David A.,et al. Molecular phylogeny of Solms-laubachia (Brassicaceae) s.l., based on multiple nuclear and plastid DNA sequences, and its biogeographic implications[J]. JOURNAL OF SYSTEMATICS AND EVOLUTION,2009,47(5):402-415.
APA	Yue, Ji-Pei,Sun, Hang,Baum, David A.,Li, Jian-Hua,Al-Shehbaz, Ihsan A.,&Ree, Richard.(2009).Molecular phylogeny of Solms-laubachia (Brassicaceae) s.l., based on multiple nuclear and plastid DNA sequences, and its biogeographic implications.JOURNAL OF SYSTEMATICS AND EVOLUTION,47(5),402-415.
MLA	Yue, Ji-Pei,et al."Molecular phylogeny of Solms-laubachia (Brassicaceae) s.l., based on multiple nuclear and plastid DNA sequences, and its biogeographic implications".JOURNAL OF SYSTEMATICS AND EVOLUTION 47.5(2009):402-415.

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