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植物研究 ›› 2022, Vol. 42 ›› Issue (4): 556-564.doi: 10.7525/j.issn.1673-5102.2022.04.005

• 系统与进化 • 上一篇    下一篇

青藏高原岷县龙胆的遗传分化与种群动态历史分析

付鹏程, 韦秋前, 史明艳()   

  1. 洛阳师范学院生命科学学院,洛阳 471934
  • 收稿日期:2021-05-18 出版日期:2022-07-20 发布日期:2022-07-15
  • 通讯作者: 史明艳 E-mail:smy2003@sina.com
  • 作者简介:付鹏程(1988—),男,博士,主要从事植物进化研究。
  • 基金资助:
    国家自然科学基金项目(31600296)

Genetic Divergence and Demographic History of Gentiana algida var. purdomii on the Qinghai-Tibet Plateau

Pengcheng FU, Qiuqian WEI, Mingyang SHI()   

  1. School of Life Science,Luoyang Normal University,Luoyang 471934
  • Received:2021-05-18 Online:2022-07-20 Published:2022-07-15
  • Contact: Mingyang SHI E-mail:smy2003@sina.com
  • About author:FU Pengcheng(1988—),male,doctor,mainly engaged in plant evolution.
  • Supported by:
    National Natural Science Foundation of China(31600296)

摘要:

青藏高原是全球生物多样性中心之一,是研究物种形成和适应性进化的热点地区。岷县龙胆(Gentiana algida var. purdomii)是青藏高原地区特有植物,具有很高的药用价值。本研究以岷县龙胆种群为对象,基于不同遗传方式的分子标记,通过种群遗传结构、遗传分化、种群动态历史和物种分布模型等分析,探讨其在青藏高原的分化历史。结果表明:岷县龙胆具有高的遗传多样性,叶绿体数据表明种内遗传分化程度很高(FST=0.452),但核基因数据表明种内遗传分化程度很低(FST=0.022),揭示岷县龙胆种内存在强烈的基因流。种群动态历史分析表明岷县龙胆种群大小经历了近期扩张,物种分布模型的结果表明岷县龙胆在末次盛冰期以来分布范围略有扩张。分子钟模型的结果表明岷县龙胆种内的遗传分化主要发生在第四纪冰期以来。以上结果一致表明,第四纪气候波动是岷县龙胆分化的主要外部因素。本研究为龙胆属及青藏高原植物类群的物种分化、适应性研究以及资源开发与保护提供了参考。

关键词: 岷县龙胆, 遗传分化, 种群动态历史, 物种分布模型, 青藏高原

Abstract:

The Qinghai-Tibet Plateau(QTP) is one hotspot of studies about biodiversity, speciation and adaptive evolution. Gentiana algida var. purdomii, belonging to Gentianaceae, is endemic to the QTP and has high value in medicine. Based on populations across the QTP, we assessed its genetic structure, divergence and demographic history based on plastid and nuclear DNA sequences in this study. Palaeo-distribution was also reconstructed by species distribution model. High level of genetic diversity was observed in G. algida var. purdomii. Genetic differentiation was high in plastid data(FST=0.452) but low in ITS data(FST=0.022), indicating high level of gene flow in G. algida var. purdomii. Neutrality test and mismatch distribution analysis both showed signatures of recent population expansion. Species distribution modelling showed slight range expansion from the Last Glacial Maximum to the present day. Divergence time estimates suggested that the onset of intraspecific diversification generally fell into the Quaternary. The results indicated that the intraspecific divergence in G. algida var. purdomii should be related to geographical isolation and range fragmentation in glaciations. This study provides insights into genetic differentiation, adaptive evolution and conversation in Gentiana as well as alpine plants in the QTP.

Key words: Gentiana algida var. purdomii, genetic divergence, demographic history, species distribution model, Qinghai-Tibet Plateau

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