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题名: Molecular systematics and biogeography of Crawfurdia, Metagentiana and Tripterospermum (Gentianaceae) based on nuclear ribosomal and plastid DNA sequences
作者: Chen, SY; Xia, T; Wang, YJ; Liu, JQ; Chen, SL
刊名: ANNALS OF BOTANY
出版日期: 2005-09-01
卷号: 96, 期号:3, 页码:413-424
关键词: Asia ; biogeography ; Crawfurdia ; Gentiana ; Gentianeae ; Gentianaceae ; Metagentiana ; molecular systematics ; ITS ; trnL (UAA) intron ; Tripterospermum
学科分类: 生物科学::植物学
文章类型: Article
中文摘要: Background and Aims The systematic position of the genus Metagentiana and its phylogenetic relationships with Crawfurdia, Gentiana and Tripterospermum have not been explicitly addressed. These four genera belong to one of two subtribes (Gentianinae) of Gentianeae. The aim of this paper is to examine the systematic position of Crawfurdia, Metagentiana and Tripterospermum and to clarify their phylogenetic affinities more clearly using ITS and trnL intron sequences.Methods Nucleotide sequences from the internal transcribed spacers (ITS) of nuclear ribosomal DNA and the plastid DNA trnL (UAA) intron were analysed phylogenetically. Ten of fourteen Metagentiana species were sampled, together with 40 species of other genera in the subtribe Gentianinae.Key Results The data support several previously published conclusions relating to the separation of Metagentiana from Gentiana and its closer relationships to Crawfurdia and Tripterospermum based on studies of gross morphology, floral anatomy, chromosomes, palynology, embryology and previous molecular data. The molecular clock hypothesis for the tested sequences in subtribe Gentianinae was not supported by the data (P < 0.05), so the clock-independent non-parametric rate smoothing method was used to estimate divergence time. This indicates that the separation of Crawfurdia, Metagentiana and Tripterospermum from Gentiana occurred about 11.4-21.4 Mya (million years ago), and the current species of these three genera diverged at times ranging from 0.4 to 6.2 Mya.Conclusions The molecular analyses revealed that Crawfurdia, Metagentiana and Tripterospermum do not merit status as three separate genera, because sampled species of Crawfurdia and Tripterospermum are embedded within Metagentiana. The speciation and rapid radiation of these three genera is likely to have occurred in western China as a result of upthrust of the Himalayas during the late Miocene and the Pleistocene.
英文摘要: Background and Aims The systematic position of the genus Metagentiana and its phylogenetic relationships with Crawfurdia, Gentiana and Tripterospermum have not been explicitly addressed. These four genera belong to one of two subtribes (Gentianinae) of Gentianeae. The aim of this paper is to examine the systematic position of Crawfurdia, Metagentiana and Tripterospermum and to clarify their phylogenetic affinities more clearly using ITS and trnL intron sequences.
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Plant Sciences
研究领域[WOS]: Plant Sciences
关键词[WOS]: INTERNAL TRANSCRIBED SPACERS ; NUCLEOTIDE-SEQUENCES ; NORTHERN HEMISPHERE ; DIVERGENCE TIMES ; SPECIES RICHNESS ; CHLOROPLAST DNA ; PHYLOGENY ; SUBSTITUTION ; ASTERACEAE ; EVOLUTION
收录类别: SCI
语种: 英语
WOS记录号: WOS:000231363200008
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内容类型: 期刊论文
URI标识: http://210.75.249.4/handle/363003/1364
Appears in Collections:中国科学院西北高原生物研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, NW Plateau Inst Biol, Lab Qinghai Tibet Biol Evolut & Adaptat, Xining 810001, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Chen Shengyun, Xia Tao, Wang Yujin, Liu Jianquan, Chen Shilong.Molecular systematics and biogeography of Crawfurdia, Metagentiana and Tripterospermum (Gentianaceae) based on nuclear ribosomal and plastid DNA sequences.ANNALS OF BOTANY,2005,96(3):413-424
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文件名: Molecular systematics and biogeography of Crawfurdia, Metagentiana and Tripterospermum (Gentianaceae) based on nuclear ribosomal and plastid DNA sequences.pdf
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