Phylogeography and introgression between Pinus kesiya and Pinus yunnanensis in Southeast Asia

IF 3.7 1区 生物学 Q1 Agricultural and Biological Sciences Journal of Systematics and Evolution Pub Date : 2023-01-31 DOI:10.1111/jse.12949
Jie Gao, Kyle W. Tomlinson, Wei Zhao, Baosheng Wang, Ralph Sedricke Lapuz, Jing-Xin Liu, Bonifacio O. Pasion, Bach T. Hai, Souvick Chanthayod, Jin Chen, Xiao-Ru Wang
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Abstract

Southeast Asia (SEA) has seen strong climatic oscillations and fluctuations in sea levels during the Quaternary. The impact of past climate changes on the evolution and distribution of local flora in SEA is still poorly understood. Here we aim to infer how the Quaternary climate change affects the evolutionary process and range shifts in two pine species. We investigated the population genetic structure and diversity using cytoplasmic DNA markers, and performed ecological niche modeling to reconstruct the species past distribution and to project range shift under future climates. We found substantial gene flow across the continuous distribution of the subtropical Pinus yunnanensis. In contrast, the tropical Pinus kesiya showed a strong population structure in accordance with its disjunct distribution across montane islands in Indochina and the Philippines. A broad hybrid zone of the two species occurs in southern Yunnan. Asymmetric introgression from the two species was detected in this zone with dominant mitochondrial gene flow from P. yunnanensis and chloroplast gene flow from P. kesiya. The observed population structure suggests a typical postglaciation expansion in P. yunnanensis, and a glacial expansion and interglacial contraction in P. kesiya. Ecological niche modeling supports the inferred demographic history and predicts a decrease in range size for P. kesiya under future climates. Our results suggest that tropical pine species in SEA have undergone evolutionary trajectories different from high latitude species related to their Quaternary climate histories. We also illustrate the need for urgent conservation actions in this fragmented landscape.

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东南亚黑松和云南松之间的系统地理学和引种关系
东南亚(SEA)在第四纪期间经历了强烈的气候振荡和海平面波动。过去的气候变化对东南亚当地植物区系的演化和分布的影响仍然知之甚少。在此,我们旨在推断第四纪气候变化如何影响两个松树物种的进化过程和分布范围的变化。我们利用细胞质DNA标记研究了种群的遗传结构和多样性,并进行了生态位建模,以重建物种过去的分布和预测未来气候下的分布区转移。我们发现,亚热带云南红松在连续分布中存在大量基因流动。与此相反,热带红松(Pinus kesiya)在印度支那和菲律宾的山地岛屿上分布不均,表现出较强的种群结构。这两个物种在云南南部有一个广泛的杂交区。在这一区域发现了两个物种的非对称引种,主要的线粒体基因来自云南滇金丝猴,叶绿体基因来自克氏滇金丝猴。观察到的种群结构表明,云南滇金丝猴是典型的冰期后扩张,而克什米尔滇金丝猴则是冰期扩张和冰期间收缩。生态位建模支持推断的种群历史,并预测在未来气候条件下,P. kesiya的分布范围将缩小。我们的研究结果表明,东南亚地区的热带松树物种经历了不同于高纬度物种的进化轨迹,这与它们的第四纪气候历史有关。我们还说明了在这片支离破碎的土地上采取紧急保护行动的必要性。
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来源期刊
Journal of Systematics and Evolution
Journal of Systematics and Evolution Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics
CiteScore
7.40
自引率
8.10%
发文量
1368
审稿时长
6-12 weeks
期刊介绍: Journal of Systematics and Evolution (JSE, since 2008; formerly Acta Phytotaxonomica Sinica) is a plant-based international journal newly dedicated to the description and understanding of the biological diversity. It covers: description of new taxa, monographic revision, phylogenetics, molecular evolution and genome evolution, evolutionary developmental biology, evolutionary ecology, population biology, conservation biology, biogeography, paleobiology, evolutionary theories, and related subjects.
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