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题名: Molecular evidence for fragmentation among populations of Taxus wallichiana var. mairei, a highly endangered conifer in China
作者: Zhang, Xue-Mei1, 2, 3; null(高连明)1, 2; Moeller, Michael4; null(李德铢)1, 2
刊名: CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE
英文摘要: Taxus wallichiana var. mairei (Lemee & Leveille) L. K. Fu & Nan Li is a highly endangered conifer in China. It is dioecious and wind pollinated, with seed dispersal by animals. Extant natural populations on mainland China and Taiwan are highly scattered, largely as a result of habitat loss and overexploitation. Intersimple sequence repeat (ISSR) markers were employed to assess the genetic structure among 464 individuals from 17 populations across the variety's distribution range in the Sino-Japanese and Malesian floristic subkingdoms. ISSRs revealed a high genetic diversity (percentage of polymorphic loci = 98.4%, Nei's gene diversity = 0.3467, Shannon's information index = 0.5152) at the species level and high differentiation among populations (coefficient of gene differentiation = 0.4066; theta(B) = 0.4376). Gene flow among populations was found to be limited to the mainland populations. A UPGMA (unweighted pair group method with arithmetic mean) dendrogram suggests that the population in Taiwan is genetically the most isolated, while among the mainland populations a trend of an east-west split is suggested. This finding is supported by the analysis of molecular variance. The pattern of genetic variation suggests that the extant distribution of T. wallichiana var. mairei is the result of the fragmentation of a historically more continuous distribution. Conservation measures for this highly endangered plant are discussed, and an integrated approach to increase plant density and connectivity among the remaining populations is suggested.
出版日期: 2009-04-01
卷号: 39, 期号:4, 页码:755-764
DOI标识: 10.1139/X09-003
语种: 英语
收录类别: SCI
学科分类: Forestry
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内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/11211
Appears in Collections:中国西南野生生物种质资源库_期刊论文

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作者单位: 1.Chinese Acad Sci, Key Lab Biodivers & Biogeog, Kunming Inst Bot, Kunming 650204, Yunnan, Peoples R China
2.Germplasm Bank Wild Species, Plant Germplasm & Genom Ctr, Kunming 650204, Yunnan, Peoples R China
3.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
4.Royal Bot Garden Edinburgh, Edinburgh EH3 5LR, Midlothian, Scotland

Recommended Citation:
Zhang, XM; Gao, LM; Moller, M; Li, DZ.Molecular evidence for fragmentation among populations of Taxus wallichiana var. mairei, a highly endangered conifer in China,CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE,2009,39(4):755-764
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