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论文 |
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论文题目: |
Molecular evidence for fragmentation among populations of Taxus wallichiana var. mairei, a highly endangered conifer in China
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论文题目英文: |
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作者: |
Zhang, Xue-Mei; Gao, Lian-Ming; Moeller, Michael; Li, De-Zhu
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论文出处: |
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年: |
2009
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卷: |
39 |
期: |
4 |
页: |
755-764 |
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发表期刊: |
CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE |
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影响因子: |
1.434
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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. |
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