Effects of climatic fluctuations on the fragmented distribution pattern of a Tertiary relict plant, Pseudotaxus chienii (Taxaceae), in subtropical China

IF 2.3 2区 生物学 Q2 PLANT SCIENCES
Ning Li, Zhen Wang, Qi Deng, Ting Wang, Ying-Juan Su
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引用次数: 0

Abstract

Abstract Habitat fragmentation can facilitate local adaptation of species to heterogeneous environments and affect population demographic history. To understand the factors influencing evolutionary dynamics, such as climatic fluctuations and complex geomorphological features, we used 18 chloroplast microsatellites, 15 nuclear microsatellites, three chloroplast fragments, and two nuclear regions to explore the genetic structure and phylogeographical history of Pseudotaxus chienii. Furthermore, its current and past distributions were constructed based on ecological niche modelling. Moderate to high levels of genetic diversity were found at the species level. Precipitation was a decisive factor influencing the genetic structure of P. chienii. In addition, local adaptation to heterogeneous environments also contributed to maintain the fragmented distribution. Finally, incomplete lineage sorting led to the cyto-nuclear discordance. Overall, we show that pre-Quaternary and Quaternary climatic fluctuations and restricted gene flow exerted significant effects on the formation and maintenance of the fragmented distribution of P. chienii. The study provides new insights into the evolutionary history of plants in subtropical China.
气候波动对亚热带第三纪孑遗植物叶红杉碎片化分布格局的影响
生境破碎化可以促进物种对异质环境的局部适应,并影响种群的人口统计历史。利用18个叶绿体微卫星、15个核微卫星、3个叶绿体片段和2个核区对中国伪红豆杉(Pseudotaxus chienii)的遗传结构和系统地理历史进行了研究,以了解气候波动和复杂的地貌特征等影响其进化动态的因素。此外,基于生态位模型构建了其现在和过去的分布。在物种水平上具有中高水平的遗传多样性。降水是影响黄颡鱼遗传结构的决定性因素。此外,对异质环境的局部适应也有助于保持碎片化分布。最后,不完整的谱系分选导致细胞-核不一致。综上所述,第四纪前和第四纪的气候波动和限制性的基因流动对鸡鸡碎片化分布的形成和维持具有重要影响。该研究为了解中国亚热带植物的进化史提供了新的见解。
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来源期刊
CiteScore
5.70
自引率
8.30%
发文量
54
审稿时长
3.5 months
期刊介绍: The Botanical Journal of the Linnean Society publishes original papers on systematic and evolutionary botany and comparative studies of both living and fossil plants. Review papers are also welcomed which integrate fields such as cytology, morphogenesis, palynology and phytochemistry into a taxonomic framework. The Journal will only publish new taxa in exceptional circumstances or as part of larger monographic or phylogenetic revisions.
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