植物生态学报 ›› 2025, Vol. 49 ›› Issue (10): 1626-1642.DOI: 10.17521/cjpe.2024.0445

• 研究论文 • 上一篇    下一篇

孑遗植物湖北枫杨的环境适应性遗传变异与遗传脆弱性

逯子佳1,2, 王天瑞1, 郑斯斯1, 孟宏虎3,4, 曹建国2, Gregor KOZLOWSKI1,5,6, 宋以刚1,*()   

  1. 1上海辰山植物园, 华东野生濒危资源植物保育中心, 上海 201602
    2上海师范大学生命科学学院, 上海 200234
    3中国科学院西双版纳热带植物园综合保护中心, 昆明 650223
    4中国科学院东南亚生物多样性研究中心, 缅甸内比都 05282
    5Department of Biology and Botanic Garden, University of Fribourg, Fribourg 1700, Switzerland
    6Natural History Museum Fribourg, Fribourg 1700, Switzerland
  • 收稿日期:2024-12-09 接受日期:2025-02-07 出版日期:2025-10-20 发布日期:2025-11-20
  • 通讯作者: *宋以刚(ygsong@cemps.ac.cn)
  • 基金资助:
    中国国家留学基金(201608310121);上海市绿化和市容管理局科学技术项目(G212406);Foundation Franklinia(2017-2020)

Environmental adaptive genetic variation and genetic vulnerability of relict plant Pterocarya hupehensis

LU Zi-Jia1,2, WANG Tian-Rui1, ZHENG Si-Si1, MENG Hong-Hu3,4, CAO Jian-Guo2, Gregor KOZLOWSKI1,5,6, SONG Yi-Gang1,*()   

  1. 1Eastern China Conservation Centre for Wild Endangered Plant Resources, Shanghai Chenshan Botanical Garden, Shanghai 201602, China
    2College of Life Sciences, Shanghai Normal University, Shanghai 200234, China
    3Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China
    4Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences, Nay Pyi Taw 05282, Myanmar
    5Department of Biology and Botanic Garden, University of Fribourg, Fribourg 1700, Switzerland
    6Natural History Museum Fribourg, Fribourg 1700, Switzerland
  • Received:2024-12-09 Accepted:2025-02-07 Online:2025-10-20 Published:2025-11-20
  • Supported by:
    The China Scholarship Council(201608310121);The Special Fund for Scientific Research of Shanghai Landscaping & City Appearance Administrative Bureau(G212406);Foundation Franklinia(2017-2020)

摘要:

气候的快速波动正加速改变着物种命运, 导致部分物种的脆弱性加剧, 并造成许多物种的遗传多样性丧失, 甚至面临灭绝风险。孑遗植物历经新生代以来的极端气候波动, 携带着大量与环境适应相关遗传信息。探讨其种群适应环境的遗传基础及其对未来气候的适应潜力, 可为生物多样性保护提供重要参考依据。该研究以环绕中国四川盆地分布的新生代孑遗植物湖北枫杨(Pterocarya hupehensis)为研究对象, 对其分布范围内18个种群的122个个体进行简化基因组测序; 利用景观基因组学分析方法, 对湖北枫杨的生态适应和遗传脆弱性进行研究。特异性位点检测表明, 398个单核苷酸多态性位点(SNPs)与6个气候因子(等温性、最冷月份最低气温、气温年较差、最湿季度平均气温、最湿月份降水量和降水量季节性变化)具有显著关联, 此外检测到177个受到选择的SNPs位点。梯度森林分析和广义相异模型分析表明降水量季节性变化是影响该物种遗传变异的重要气候因子。Mantel检验检测到显著的环境隔离信号, 冗余分析结果表明环境因素对于遗传变异的解释度大于地理因素。最后, 非适应性风险分析预测到湖北枫杨种群在2090年SSP585情景下的种群脆弱性整体高于SSP126情景, 且降水量季节性变化对于湖北枫杨西北部种群适应能力具有重要影响。该研究不仅为易危物种湖北枫杨在未来气候变化下的管理与保护策略提供了理论依据, 还为环四川盆地孑遗植物如何应对未来气候变化提供新范例。

关键词: 孑遗植物, 景观基因组学, 生态适应, 遗传脆弱性, 简化基因组测序

Abstract:

Aims The rapid fluctuations of climate are increasingly altering the fate of species, exacerbating their vulnerability, leading to the loss of genetic diversity in many species, and even pushing some to the brink of extinction. Relict plants, having survived extreme climate changes since the Cenozoic era, carry a wealth of genetic information related to environmental adaptation. Investigating the genetic basis of their population-level environmental adaptation and their potential to cope with future climate change can provide valuable insights for biodiversity conservation.
Methods In this study, restriction site-associated DNA sequencing (RAD-seq) was performed on 122 individuals from 18 populations of Pterocarya hupehensis, which is a Cenozoic relict plant distributed around the Sichuan Basin in China. Then, the ecological adaptation and genetic vulnerability of P. hupehensis were studied by landscape genomics. First, we use a latent factor mixed model (LFMM) and Pcadapt to detect selected sites. Second, a Mantel test based on linear models, redundancy analysis (RDA), gradient forest (GF), and generalized dissimilarity modelling (GDM) were used to investigate the response patterns of genetic variation to environmental gradients. Finally, based on the risk of non-adaptedness analysis (RONA), the vulnerability of the P. hupehensis was predicted for the SSP245 and SSP585 scenarios in 2090.
Important findings A total of 398 single nucleotide polymorphism loci (SNPs) were significantly associated with the six climatic factors (isothermality, minimum temperature of coldest month, temperature annual range, mean temperature of wettest quarter, precipitation of wettest month, and precipitation seasonality). In addition, 177 of them were detected as selected SNPs. We found that precipitation seasonality was an important climatic factor affecting the genetic variation of P. hupehensis. A significant signal of isolation by environment (IBE) was detected, indicating that environmental factors account for more genetic variation than geographical factors. Under the SSP585 scenario in 2090, the genetic vulnerability of P. hupehensis was higher than that under SSP126 scenario. The precipitation seasonality has an important effect on the adaptative ability of the population in the northwest range of P. hupehensis. This study not only provides a theoretical foundation for the management and conservation strategies of vulnerable species in the face of future climate change, but also offers a new case study on how relict plants around Sichuan Basin may respond to future climate change.

Key words: relict plants, landscape genomics, ecological adaptation, genetic vulnerability, restriction site-associated DNA sequencing