Molecular phylogeny of Helleborus (Ranunculaceae), with an emphasis on the East Asian-Mediterranean disjunction

	Molecular phylogeny of Helleborus (Ranunculaceae), with an emphasis on the East Asian-Mediterranean disjunction
	Sun, H; McLewin, W ; Fay, MF
	2001-11-01
发表期刊	TAXON
ISSN	0040-0262
卷号	50 期号:4 页码:1001-1018
摘要	Phylogenetic relationships within the genus Helleborus (Ranunculaceae) were evaluated with analyses of plastid trnL-F and partial matK and nuclear ITS DNA sequences for all 16 currently recognised species in addition to several subspecies and geographical variants. The molecular study provides strong support for the monophyly of Helleborus. However, both traditional divisions of the genus, into two groups (Caulescentes and Scapigeri) or two subgenera (Helleborastrum and Helleborus), are refuted. All six currently recognised sections (Dicarpon, Chenopus, Griphopus, Helleborus, Helleborastrum, and Syncarpus) are monophyletic, four by default because they are monospecific. Section Dicarpon (H. thibetanus) is strongly supported as sister group to section Helleborastrum and could therefore be sunk into that section. Relationships between this pair of sections and the other sections are, however, not clear. At the specific level, all species which are clearly distinct morphologically are also distinct in terms of molecular divergence, but relationships between the poorly differentiated species in section Helleborastrum are not resolved with any degree of support. Using a molecular clock based on matK sequence divergence, the disjunction of H. thibetanus and section Helleborastrum between East Asia and the Mediterranean is tentatively dated at approximately 23 million years (middle Miocene), which corresponds well with the geological history of the area where H. thibetanus occurs.
关键词	Biogeography Helleborus Its Matk Molecular Systematics Trnl-f
学科领域	Plant Sciences ; Evolutionary Biology
收录类别	SCI
语种	英语
WOS记录号	WOS:000173484600002
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/13943
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.Royal Bot Gardens, Richmond TW9 3DS, Surrey, England 2.Phedar Nursery, Stockport SK6 3DS, Lancs, England 3.Chinese Acad Sci, Kunming Inst Bot, Kunming 650204, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Sun, H,McLewin, W,Fay, MF. Molecular phylogeny of Helleborus (Ranunculaceae), with an emphasis on the East Asian-Mediterranean disjunction[J]. TAXON,2001,50(4):1001-1018.
APA	Sun, H,McLewin, W,&Fay, MF.(2001).Molecular phylogeny of Helleborus (Ranunculaceae), with an emphasis on the East Asian-Mediterranean disjunction.TAXON,50(4),1001-1018.
MLA	Sun, H,et al."Molecular phylogeny of Helleborus (Ranunculaceae), with an emphasis on the East Asian-Mediterranean disjunction".TAXON 50.4(2001):1001-1018.

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