Contrasting phylogeographical patterns between mainland and island taxa of the Pinus luchuensis complex
Contrasting phylogeographical patterns between mainland and island taxa of the Pinus luchuensis complex
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DOI：
10.1111/j.1365-294x.2005.02833.x
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发表时间：
2006-03-01
影响因子：
4.9
通讯作者：
Chiang, TY
中科院分区：
文献类型：
--
作者：
Chiang, YC;Hung, KH;Chiang, TY
物种的地理分布包括大陆和岛屿人口提供了一个理想的系统，检查隔离和遗传分歧。本研究利用叶绿体DNA（cpDNA）和线粒体DNA（mtDNA）的基因组学方法，对我国东部的一个重要树种--禄劝松（Pinusluchuensis）的种群结构和地理分布进行了研究。hwangshanensis），台湾（ssp. taiwanensis）和琉球群岛（ssp. luchuensis）。线粒体DNA和叶绿体DNA的基因谱系揭示了两个主要的谱系。分子年代测定显示，这些谱系在琉球亚种在台湾和琉球群岛定居之前就已经分化了。线粒体DNA和叶绿体DNA都显示分子遗传学和亚种命名之间缺乏对应关系。系统地理学分析表明，亚种的并系是最近的分歧，而不是二次接触的结果。尽管琉球原住民在岛屿上的分化历史较短，但岛屿居群与大陆居群表现出相同程度的遗传分化。中国大陆低水平的遗传多样性。黄山种则显示出人口瓶颈。相比之下，岛屿种群的遗传组成的高度异质性可能与来自大陆的多次殖民历史有关。细胞器DNA多态性的空间分布是一致的逐步殖民化的岛屿人口的模式。
Species whose geographical distribution encompasses both mainland and island populations provide an ideal system for examining isolation and genetic divergence. In this study, paternally transmitted chloroplast DNA (cpDNA) and maternally transmitted mitochondrial DNA (mtDNA) were used to estimate population structure and phylogeography of Pinus luchuensis, a species found in eastern China (ssp. hwangshanensis), Taiwan (ssp. taiwanensis), and the Ryukyu Archipelago (ssp. luchuensis). Gene genealogies of both mtDNA and cpDNA reveal two major lineages. Molecular dating indicates that these lineages diverged before the colonization of P. luchuensis subspecies in Taiwan and the Ryukyu Archipelago. Both mtDNA and cpDNA show a lack of correspondence between molecular phylogeny and subspecies designation. Phylogeographical analysis suggests that paraphyly of the subspecies is the result of recent divergence rather than secondary contacts. In spite of the short divergence history of P. luchuensis on islands, the island populations show the same degree of genetic divergence as mainland populations. Low levels of genetic diversity in the mainland ssp. hwangshanensis suggest demographic bottlenecks. In contrast, the high heterogeneity of genetic composition for island populations is likely to be associated with a history of multiple colonization from the mainland. The spatial apportionment of organelle DNA polymorphisms is consistent with a pattern of stepwise colonization on island populations.