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
ISSN0040-0262
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研究方向Plant Sciences ; Evolutionary Biology
WOS类目Plant Sciences ; Evolutionary Biology
WOS记录号WOS:000173484600002
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被引频次:52[WOS]   [WOS记录]     [WOS相关记录]
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
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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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