Phylogeography of the Qinghai-Tibetan Plateau endemic Juniperus przewalskii (Cupressaceae) inferred from chloroplast DNA sequence variation

	Phylogeography of the Qinghai-Tibetan Plateau endemic Juniperus przewalskii (Cupressaceae) inferred from chloroplast DNA sequence variation
	Zhang, Q ; Chiang, TY ; George, M ; Liu, JQ ; Abbott, RJ
刊名	molecular ecology
	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
合作状况	其它
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.
学科主题	生物化学
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
公开日期	2009-12-09
内容类型	期刊论文
源URL	[http://ir.nwipb.ac.cn/handle/363003/1360]
专题	西北高原生物研究所_中国科学院西北高原生物研究所
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
推荐引用方式 GB/T 7714	Zhang, Q,Chiang, TY,George, M,et al. Phylogeography of the Qinghai-Tibetan Plateau endemic Juniperus przewalskii (Cupressaceae) inferred from chloroplast DNA sequence variation[J]. molecular ecology,2005,14(11):3513-3524.
APA	Zhang, Q,Chiang, TY,George, M,Liu, JQ,&Abbott, RJ.(2005).Phylogeography of the Qinghai-Tibetan Plateau endemic Juniperus przewalskii (Cupressaceae) inferred from chloroplast DNA sequence variation.molecular ecology,14(11),3513-3524.
MLA	Zhang, Q,et al."Phylogeography of the Qinghai-Tibetan Plateau endemic Juniperus przewalskii (Cupressaceae) inferred from chloroplast DNA sequence variation".molecular ecology 14.11(2005):3513-3524.