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题名: Phylogeography of the Qinghai-Tibetan Plateau endemic Juniperus przewalskii (Cupressaceae) inferred from chloroplast DNA sequence variation
作者: Zhang, Q; Chiang, TY; George, M; Liu, JQ; Abbott, RJ
刊名: MOLECULAR ECOLOGY
出版日期: 2005-10-01
卷号: 14, 期号:11, 页码:3513-3524
关键词: cpDNA trnT-trnF and trnS-trnG ; forest invasion ; historical biogeography ; Juniperus przewalskii ; phylogeography ; postglacial range expansion ; Qinghai-Tibetan Plateau ; Quaternary
学科分类: 生物科学::生物化学
文章类型: Article
中文摘要: The vegetation of the northeast Qinghai-Tibetan Plateau is dominated by alpine meadow and desert-steppe with sparse forests scattered within it. To obtain a better understanding of the phylogeography of one constituent species of the forests in this region, we examined chloroplast trnT-trnF and trnS-trnG sequence variation within Juniperus przewalskii, a key endemic tree species. Sequence data were obtained from 392 trees in 20 populations covering the entire distribution range of the species. Six cpDNA haplotypes were identified. Significant population subdivision was detected (G(ST) = 0.772, N-ST = 0.834), suggesting low levels of recurrent gene flow among populations and significant phylogeographic structure (N-ST > G(ST), P < 0.05). Eight of the nine disjunct populations surveyed on the high-elevation northeast plateau were fixed for a single haplotype (A), while the remaining, more westerly population, contained the same haplotype at high frequency together with two low frequency haplotypes (C and F). In contrast, most populations that occurred at lower altitudes at the plateau edge were fixed or nearly fixed for one of two haplotypes, A or E. However, two plateau edge populations had haplotype compositions different from the rest. In one, four haplotypes (A, B, D and E) were present at approximately equivalent frequencies, which might reflect a larger refugium in the area of this population during the last glacial period. Phylogenetic analysis indicated that the most widely distributed haplotype A is not ancestral to other haplotypes. The contrasting phylogeographic structures of the haplotype-rich plateau edge area and the almost haplotype-uniform plateau platform region indicate that the plateau platform was recolonized by J. przewalskii during the most recent postglacial period. This is supported by the findings of a nested clade analysis, which inferred that postglacial range expansion from the plateau edge followed by recent fragmentation is largely responsible for the present-day spatial distribution of cpDNA haplotypes within the species.
英文摘要: The vegetation of the northeast Qinghai-Tibetan Plateau is dominated by alpine meadow and desert-steppe with sparse forests scattered within it. To obtain a better understanding of the phylogeography of one constituent species of the forests in this region, we examined chloroplast trnT-trnF and trnS-trnG sequence variation within Juniperus przewalskii, a key endemic tree species. Sequence data were obtained from 392 trees in 20 populations covering the entire distribution range of the species. Six cpDNA haplotypes were identified. Significant population subdivision was detected (G(ST) = 0.772, N-ST = 0.834), suggesting low levels of recurrent gene flow among populations and significant phylogeographic structure (N-ST > G(ST), P < 0.05). Eight of the nine disjunct populations surveyed on the high-elevation northeast plateau were fixed for a single haplotype (A), while the remaining, more westerly population, contained the same haplotype at high frequency together with two low frequency haplotypes (C and F). In contrast, most populations that occurred at lower altitudes at the plateau edge were fixed or nearly fixed for one of two haplotypes, A or E. However, two plateau edge populations had haplotype compositions different from the rest. In one, four haplotypes (A, B, D and E) were present at approximately equivalent frequencies, which might reflect a larger refugium in the area of this population during the last glacial period. Phylogenetic analysis indicated that the most widely distributed haplotype A is not ancestral to other haplotypes. The contrasting phylogeographic structures of the haplotype-rich plateau edge area and the almost haplotype-uniform plateau platform region indicate that the plateau platform was recolonized by J. przewalskii during the most recent postglacial period. This is supported by the findings of a nested clade analysis, which inferred that postglacial range expansion from the plateau edge followed by recent fragmentation is largely responsible for the present-day spatial distribution of cpDNA haplotypes within the species.
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Biochemistry & Molecular Biology ; Ecology ; Evolutionary Biology
研究领域[WOS]: Biochemistry & Molecular Biology ; Environmental Sciences & Ecology ; Evolutionary Biology
关键词[WOS]: MITOCHONDRIAL-DNA ; POPULATION DIFFERENTIATION ; STATISTICAL PHYLOGEOGRAPHY ; GEOGRAPHICAL-DISTRIBUTION ; POSTGLACIAL COLONIZATION ; GENETIC CONSEQUENCES ; CLADISTIC-ANALYSIS ; GLACIAL REFUGIA ; ICE AGES ; DIVERSITY
收录类别: SCI
语种: 英语
WOS记录号: WOS:000231800900017
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内容类型: 期刊论文
URI标识: http://210.75.249.4/handle/363003/1360
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 Tibetan Plateau Biol Evolut & Adaptat, Xining 810001, Peoples R China
2.Lanzhou Univ, Key Lab Arid & Grassland Ecol, Lanzhou 730000, Peoples R China
3.Natl Cheng Kung Univ, Dept Life Sci, Tainan 701, Taiwan
4.Univ Marburg, Fac Geog, D-35032 Marburg, Germany
5.Univ St Andrews, Sch Biol, St Andrews KY16 9TH, Fife, Scotland

Recommended Citation:
Zhang Q, Chiang TY, George M, Liu JQ, Abbott RJ. Phylogeography of the Qinghai-Tibetan Plateau endemic Juniperus przewalskii (Cupressaceae) inferred from chloroplast DNA sequence variation.MOLECULAR ECOLOGY,2005,14(11):3513-3524
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