Genetic structures of Calophyllum inophyllum L., a tree employing sea-drift seed dispersal in the northern extreme of its distribution
Genetic structures of Calophyllum inophyllum L., a tree employing sea-drift seed dispersal in the northern extreme of its distribution
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Calophyllum inophyllum L.（一种在其分布最北端利用海漂种子传播的树）的遗传结构
DOI：
10.1007/s13595-014-0365-5
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发表时间：
2014
影响因子：
3
通讯作者：
Kazutaka Kato
中科院分区：
文献类型：
--
作者：
Hanaoka So;Ching-Te Chien;Shun-Ying Chen;Atsushi Watanabe;Suzuki Setsuko;Kazutaka Kato
·背景关于海漂种子在岛屿种群中传播的树的潜在基因流动和由此产生的遗传结构，我们知之甚少。·目的对海流种子传播的典型植物--海南海棠的当前遗传结构和历史基因流动的大小进行了估计。·方法从物种分布的最北端(台湾和日本的樱岛、大户和小川群岛)采集样本，并使用15个EST-SSR标记进行基因分型。确定遗传分化(FST和AMOVA)、遗传结构(STRUCTRE分析)和历史基因流(赋值检验)。结构分析还发现了清晰的遗传结构，这表明在地理上构建的岛群之间存在优势簇的分化。结论通过海上漂流种子传播的基因流动潜力很大，即使在小岛屿之间也是可能的。然而，基因流动的范围和频率并不足以阻止数百公里范围内的遗传分化。
•ContextLittle is known about the potential of gene flow and resulting genetic structures of trees employing sea-drifting seed dispersal in island populations.•AimsCurrent genetic structure and the magnitude of historical gene flow were estimated in island populations ofCalophyllum inophyllumL., a typical plant employing sea-drifting seed dispersal.•MethodsSamples were collected from the northern extreme of the species’ distribution (Taiwan and the Sakishima, Daito, and Ogasawara Islands, Japan) and genotyped using 15 EST-SSR markers. Genetic differentiation (FSTand AMOVA), genetic structure (STRUCTRE analysis), and historical gene flow (assignment testing) were determined.•ResultsFrequent gene flow within and rare gene flow among island groups was determined using assignment testing. Clear genetic structures were also detected using the STRUCTURE analysis, which demonstrated differentiation between dominant clusters among geographically constructed island groups.•ConclusionsThe potential for gene flow via sea-drifting seed dispersal was high, and this was possible even among small islands. However, the extent and frequency of gene flow were not great enough to prevent genetic differentiation in a range of over a few hundred kilometers.