Allozyme diversity and the evolution ofCrepidiastrum (Compositae) on the Bonin (Ogasawara) Islands
Allozyme diversity and the evolution ofCrepidiastrum (Compositae) on the Bonin (Ogasawara) Islands
复制标题
小笠原群岛上的等位酶多样性和 Crepidiastrum（菊科）的进化
DOI：
10.1007/bf02491263
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
M. Ono
中科院分区：
文献类型：
--
作者：
M. Ito;M. Ono
假蕨属Crepidiastrumis分布于东亚，包括7种。在小笠原群岛，有三种Crepidiastrumocur，它们都是该岛特有的。为探讨这些特有种的起源和物种形成，对小笠原群岛的3种特有种、Crepidiastrum的其余4种以及与Crepidiastrum亲缘关系较近的齿叶黄蓍（Youngia denticulata）进行了电泳研究，共采集14个居群的386个个体。结果，17个位点的10个酶系统的解析和基因频率为每个群体进行了计算。在一些海洋岛屿植物中，岛屿物种的遗传变异性较低。在UPGMA方法生成的树状图中识别出四个组。小笠原特有种聚在一起，表明它们是单系起源。美洲假单胞菌Linguaefolium的基因非常相似，这可能表明岛屿内最近和快速的物种形成。
The genusCrepidiastrumis distributed in East Asia and includes 7 species. In the Bonin Islands, three species ofCrepidiastrumoccur, and all of them are endemic to the islands. For detecting the origin and speciation of these endemic species, electrophoretic studies have been done in three endemic species of the Bonin Islands as well as in the remaining four species ofCrepidiastrum, andYoungia denticulatawhich is considered to be closely related toCrepidiastrum.A total of 386 individuals were sampled from 14 populations. As a result, 17 loci of 10 enzyme systems were resolved and gene frequencies for each population were calculated. The genetic variability was low in island species, as reported in some oceanic island plants. Four groups were recognized in the dendrogram generated by the UPGMA method. The Bonin endemics were clustered together, suggesting a monophyletic origin.C. ameristophyllumandC. linguaefoliumwere found to be genetically very similar, and this may suggest recent and rapid speciation within the islands.