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题名: Molecular phylogeny and biogeography of Astilbe (Saxifragaceae) in Asia and eastern North America
作者: Zhu, Wei-Dong1, 2; Nie, Ze-Long1; Wen, Jun3; Sun Hang(孙航)1
刊名: BOTANICAL JOURNAL OF THE LINNEAN SOCIETY
关键词: Beringian migration ; intercontinental disjunction ; south-western China ; tropical Asia
英文摘要: Phylogenetic analyses were conducted for Astilbe (Saxifragaceae), an Asian/eastern North American disjunct genus, using sequences of nuclear ribosomal internal transcribed spacer (ITS) and plastid matK, trnL-trnF and psbA-trnH regions. The monophyly of Astilbe is well supported by both ITS and plastid sequences. Topological incongruence was detected between the plastid and the ITS trees, particularly concerning the placement of the single North American species, A. biternata, which may be most probably explained by its origin involving hybridization and/or allopolyploidy with plastid capture. In Astilbe, all species with hermaphroditic flowers constitute a well-supported clade; dioecious species form a basal grade to the hermaphroditic clade. Astilbe was estimated to have split with Saxifragopsis from western North America at 20.69 Ma (95% HPD: 12.1430.22 Ma) in the early Miocene. This intercontinental disjunction between Astilbe and Saxifragopsis most likely occurred via the Bering land bridge. The major clade of Astilbe (all species of the genus excluding A. platyphylla) was inferred to have a continental Asian origin. At least three subsequent migrations or dispersals were hypothesized to explain the expansion of Astilbe into North America, Japan and tropical Asian islands. The intercontinental disjunct lineage in Astilbe invokes a hybridization event either in eastern Asia or in North America. This disjunction in Astilbe may be explained by a Beringian migration around 3.54 Ma (95% high posterior density: 1.296.18 Ma) in the late Tertiary, although long-distance dispersal from eastern Asia to North America is also likely. The biogeographical connection between continental Asia, Taiwan, the Philippines and other tropical Asian islands in Astilbe provides evidence for the close floristic affinity between temperate or alpine south-western China and tropical Asia. (C) 2012 The Linnean Society of London, Botanical Journal of the Linnean Society, 2013, 171, 377-394.
出版日期: 2013-02-01
卷号: 171, 期号:2, 页码:377-394
语种: 英语
收录类别: SCI
学科分类: Plant Sciences
ISSN号: 0024-4074
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/16260
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 650201, Yunnan, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
3.Smithsonian Inst, Dept Bot, Natl Museum Nat Hist, Washington, DC 20013 USA

Recommended Citation:
Zhu, Wei-Dong; Nie, Ze-Long; Wen, Jun; Sun, Hang.Molecular phylogeny and biogeography of Astilbe (Saxifragaceae) in Asia and eastern North America,BOTANICAL JOURNAL OF THE LINNEAN SOCIETY,2013,171(2):377-394
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