Genetic variation of pantropical Terminalia catappa plants with sea-drifted seeds in the Bonin Islands: Suggestions for transplantation guidelines
Genetic variation of pantropical Terminalia catappa plants with sea-drifted seeds in the Bonin Islands: Suggestions for transplantation guidelines
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小博宁群岛泛热带榄仁树海漂种子的遗传变异：移植指南建议
DOI：
10.1111/1442-1984.12121
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发表时间：
2016
影响因子：
1.4
通讯作者：
Hiroshi Yoshimaru
中科院分区：
文献类型：
--
作者：
Suzuki Setsuko;Masato Ohtani;Kyoko Sugai;Teruyoshi Nagamitsu;Hidetoshi Kato;Hiroshi Yoshimaru
博宁群岛有许多特有的物种。然而，由于外来入侵植物的大量存在，这些物种正面临灭绝的危险。因此，在铲除外来植物后，要对本土植物进行再造林。利用核(n)微卫星（简单序列重复[SSRs]）和叶绿体（cp） DNA分析了日本博宁群岛（Bonin Islands）弹射木（terminalia catappappapa）种群的遗传变异。在22个群体中，nSSRs的遗传多样性无显著差异。然而，最近在Chichijima岛群的三个种群中发现了瓶颈。nSSR变异和cpDNA单倍型表明牧岛和Chichijima岛群和Hahajima岛群存在两个遗传上不同的群体。在博宁群岛的植物和动物中也观察到类似的遗传结构。当水深比现在低50 m时，这三个岛屿上的种群与每个岛群中的其他岛屿分离，它们由独特的nssr集群主导，这表明更新世时期岛屿连接的历史变化影响了遗传亚结构。这些结果表明，不同地理尺度上，不同的遗传因素影响着石投龙的遗传结构。在整个岛屿水平上，遗传结构是由洋流长距离传播种子决定的。在岛群水平上，由冰期-间冰期过渡引起的海平面变化导致的岛屿连接的历史变化决定了其成因结构。这些发现将有助于建立移植区边界，以便在博宁群岛上重新种植石投龙。
The Bonin Islands are endowed with endemic species. However, these species are at risk of extinction because of the exuberance of invasive alien plants. Therefore, native plant species should be revegetated after eradicating alien plants. We investigated the genetic variation ofTerminalia catappapopulations in the Bonin Islands by using nuclear (n) microsatellites (simple sequence repeats [SSRs]) and chloroplast (cp) DNA. No significant differences were observed in the genetic diversity of nSSRs among 22 populations. However, recent bottlenecks were detected in three populations on the Chichijima Island group. nSSR variation and cpDNA haplotypes suggested the presence of two genetically distinct groups in the Mukojima and Chichijima Island groups and the Hahajima Island group. A similar genetic structure was observed in plants and animals in the Bonin Islands. Populations on the three islands, which were separated from other islands in each island group when the water depth was 50‐m lower than the present level, were dominated by unique nSSRs clusters, suggesting that historical changes in island connections during the Pleistocene era affected genetic substructuring. These results suggested that different factors contributed to the genetic structure ofT.catappaon different geographic scales. At the whole‐island level, the genetic structure was determined by long‐distance seed dispersal by ocean currents. At the island‐group level, the genetic structure was determined by historical changes in island connections caused by changes in the sea level due to glacial–interglacial transition. These findings would help in establishing transplantation zone borders for revegetatingT.catappaon the Bonin Islands.