J Plant Ecol ›› 2023, Vol. 16 ›› Issue (2): rtac057.DOI: 10.1093/jpe/rtac057

• Research Articles • Previous Articles    

Phylogeographic structure of Syntrichia caninervis Mitt, a xerophytic moss, highlights the expanded during glacial period

Benfeng Yin1,2, Yuanming Zhang2, Hongxiang Zhang2, Anru Lou1,*   

  1. 1Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, College of Life Sciences, Beijing Normal University, Beijing 100875, China;
    2State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
  • Received:2021-07-17 Revised:2021-09-03 Accepted:2022-04-07 Online:2022-04-16 Published:2023-04-01
  • Contact: E-mail: louanru@bnu.edu.cn


Abstract: The rapid uplift of the Qinghai-Tibet Plateau and its aridification has significantly affected the distribution and community structure of the plants in these regions. However, most of the studies have focussed on vascular plants, and it has been unclear whether bryophytes, which are haploid plants, had similar historical population dynamics to other vascular plants during the dramatic geological and climatic environment changes of the Quaternary. This study used Syntrichia caninervis Mitt as the research object and investigated its genetic variation, differentiation and population dynamic history in China. We genotyped 27 populations throughout the distributional range of S. caninervis using two chloroplast DNA regions and 19 nuclear microsatellite loci and supplemented these data with ecological niche modelling of the potential distribution areas from the last interglacial period. The results showed that genetic data consistently identified three clades: the Qinghai-Tibet Plateau, Pamir Plateau-TienShan and Central Asia. The genetic variation of Syntrichia caninervis mainly occurred within populations and in the populations within a specific region. However, there was a significant gene exchange between the different regions. S. caninervis may have expanded during the glacial period and shrank during the interglacial period. This study provides new evidence for the dynamic population history of drought-tolerant bryophytes in response to severe environmental changes during the Quaternary glacial and interglacial cycles.

Key words: bryophyte, Qinghai-Tibet Plateau, population dynamic history, ecological niche model, genetic diversity, microsatellite

青藏高原的快速隆升和干旱化对该地区植物的分布和群落结构产生了显著影响。然而,大部分的研究都集中在维管植物上,苔藓植物作为单倍体植物,在第四纪剧烈的地质和气候环境变化中是否与其他维管植物具有相似的种群动态历史尚不清楚。本研究以齿肋赤藓(Syntrichia caninervis)为研究对象,利用2个叶绿体片段和19个核卫星位点对27个齿肋赤藓种群进行了基因分型,并模拟其在末次间冰期潜在分布区,以期揭示齿肋赤藓的遗传变异、分化和种群动态历史。研究结果表明,齿肋赤藓种群在青藏高原、帕米尔高原-天山和中亚的遗传特征一致,其遗传变异主要发生在种群内和特定区域的种群内,但不同区域间存在明显的基因交流。生态位模型预测结果显示齿肋赤藓可能在冰期扩张,在间冰期收缩。这为第四纪冰期和间冰期耐旱苔藓植物应对环境变化的种群动态历史提供了新的证据。

关键词: 苔藓, 青藏高原, 种群动态历史, 生态位模型, 遗传多样性, 微卫星