Pronounced genetic differentiation and recent secondary contact in the mangrove tree Lumnitzera racemosa revealed by population genomic analyses.
Pronounced genetic differentiation and recent secondary contact in the mangrove tree Lumnitzera racemosa revealed by population genomic analyses.
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群体基因组分析揭示了红树林 Lumnitzera racemosa 中明显的遗传分化和最近的二次接触
DOI：
10.1038/srep29486
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发表时间：
2016-07-06
影响因子：
4.6
通讯作者：
Shi S
中科院分区：
文献类型：
--
作者：
Li J;Yang Y;Chen Q;Fang L;He Z;Guo W;Qiao S;Wang Z;Guo M;Zhong C;Zhou R;Shi S
系统地研究更新世海平面波动对红树林植物的影响可以更好地了解其种群历史并为其保护提供有用的信息。因此，我们对 88 个核基因进行了群体基因组分析，以探索印度-西太平洋地区红树林的群体动态。我们的结果揭示了该物种在印度洋和太平洋种群之间存在明显的遗传分化，这可能归因于更新世冰川时期海平面下降期间马来半岛东西海岸之间的长期隔离。在柬埔寨人群中几乎所有 88 个核基因中都发现了来自两个高度分化群体的单倍型混合，这表明两个谱系在边界区域存在遗传混合。根据对六个核基因的贝叶斯聚类分析，在东南亚的其他人群中也发现了类似的遗传混合，这表明东南亚两个不同谱系的广泛且近期的二次接触。计算机模拟表明，大量人口从印度洋向南中国海迁移，这可能导致东南亚的基因混合。
Systematically investigating the impacts of Pleistocene sea-level fluctuations on mangrove plants may provide a better understanding of their demographic history and useful information for their conservation. Therefore, we conducted population genomic analyses of 88 nuclear genes to explore the population dynamics of a mangrove treeLumnitzera racemosaacross the Indo-West Pacific region. Our results revealed pronounced genetic differentiation in this species between the populations from the Indian Ocean and the Pacific Ocean, which may be attributable to the long-term isolation between the western and eastern coasts of the Malay Peninsula during sea-level drops in the Pleistocene glacial periods. The mixing of haplotypes from the two highly divergent groups was identified in a Cambodian population at almost all 88 nuclear genes, suggesting genetic admixture of the two lineages at the boundary region. Similar genetic admixture was also found in other populations from Southeast Asia based on the Bayesian clustering analysis of six nuclear genes, which suggests extensive and recent secondary contact of the two divergent lineages in Southeast Asia. Computer simulations indicated substantial migration from the Indian Ocean towards the South China Sea, which likely results in the genetic admixture in Southeast Asia.