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植物研究 ›› 2022, Vol. 42 ›› Issue (4): 565-573.doi: 10.7525/j.issn.1673-5102.2022.04.006

• 系统与进化 • 上一篇    下一篇

青藏高原东北部黄缨菊的谱系地理学

张阳1,2, 马子兰3, 徐珊珊1, 苏旭3(), 李梅英3   

  1. 1.上海科技馆自然史研究中心,上海 200041
    2.上海市静安区科学技术协会,上海 200040
    3.青海师范大学生命科学学院,西宁 810008
  • 收稿日期:2021-06-23 出版日期:2022-07-20 发布日期:2022-07-15
  • 通讯作者: 苏旭 E-mail:xusu8527972@126.com
  • 作者简介:张阳(1986—),男,助理研究员,主要从事植物谱系地理学研究。
  • 基金资助:
    国家自然科学基金项目(31800310);青海省青藏高原药用动植物资源重点实验室项目(2020-ZJ-Y40);青海师范大学2021年本科生科技创新项目(QHNU-2021-029)

Phylogeography of Xanthopappus subacaulis(Asteraceae), an Endemic Species from the Northeastern of the Qinghai-Tibet Plateau

Yang ZHANG1,2, Zilan MA3, Shanshan XU1, Xu SU3(), Meiying LI3   

  1. 1.Natural History Research Center,Shanghai Natural History Museum,Branch of Shanghai Science & Technology Museum,Shanghai 200041
    2.Jing’an Association for Science & Technology,Shanghai 200040
    3.School of Life Science,Qinghai Normal University,Xining 810008
  • Received:2021-06-23 Online:2022-07-20 Published:2022-07-15
  • Contact: Xu SU E-mail:xusu8527972@126.com
  • About author:ZHANG Yang(1986—),male,assistant researcher,engaged in plant phylogeography.
  • Supported by:
    Under the auspices of the National Natural Science Foundation of China(31800310);Key Laboratory of Medicinal Animal and Plant Resources of the Qinghai-Tibet Plateau in Qinghai Province(2020-ZJ-Y40);Science and Technology Innovation Project of Undergraduate from Qinghai Normal University in 2021(QHNU-2021-029)

摘要:

黄缨菊(Xanthopappus subacaulis)是青藏高原地区一种特有的高山草甸药用植物。为探讨第四纪冰期气候波动对黄缨菊居群遗传结构和空间分布格局的影响,对黄缨菊20个居群、123个个体的叶绿体DNA片段(psbA-trnHrbcLpsbI-psbK)进行测序和数据分析。结果表明:黄缨菊居群共检测到6个单倍型,其中H1为古老单倍型,除居群P7外其余居群均具有单倍型H1,H3、H5和H6为特有单倍型,单倍型H3为居群P7的私有单倍型,单倍型H5和H6只存在于居群P18,单倍型H2和H4主要存在于青海湖流域的居群;总的遗传多样性(He)和核苷酸多样性(π)分别为3.101和0.008 903;居群间遗传变异(68.98%)大于居群内遗传变异(31.02%),居群间遗传分化较高(FST=0.689 85,P<0.01);居群遗传分化系数NST(0.727)大于GST(0.656)(P>0.05),表明黄缨菊在分布区域内不存在明显的谱系地理结构;错配分布和中性检验结果显示,黄缨菊居群可能经历过近期扩张。据此,推测第四纪冰期黄缨菊可能在青海湖流域和甘肃临潭地区存在微型避难所,认为第四纪气候变迁及青藏高原隆升塑造了黄缨菊的现代地理分布格局。

关键词: 黄缨菊, 遗传结构, 历史动态, 叶绿体DNA, 青藏高原

Abstract:

Xanthopappus subacaulis is an endemic medicinal plant growing in the alpine meadow of the Qinghai-Tibet Plateau(QTP). To explore the influence of Quaternary climatic oscillations on the population genetic structure and distribution pattern of X. subacaulis, 3 chloroplast DNA fragments(psbA-trnHrbcL and psbI-psbK) from 123 individuals of 20 populations were sequenced and analyzed respectively in the present study. The results showed that 6 haplotypes were detected in X. subacaulis, among which H1 was an ancient haplotype. All populations of X. subacaulis had haplotype H1 except for P7. H3, H5 and H6 were private haplotypes, among which H3 was a private haplotype of population P7, and H5 and H6 only existed in P18. H2 and H4 were mainly distributed in the population of Qinghai Lake basin. The total genetic diversity(He) and nucleotide diversity(π) were 3.101 and 0.008 903, respectively. The genetic variation among populations(68.98%) was higher than that within populations(31.02%), and the genetic differentiation among populations was relatively higher(FST=0.689 85,P<0.01). The genetic differentiation coefficient NST of populations(0.727) was higher than that of GST(0.656)(P>0.05), which indicated that there was no obvious phylogeographical structure in the sampling regions. The results of mismatch distributions and neutrality tests revealed that the population of X. subacaulis might have experienced recent expansion. Therefore, the study suggests there are micro-sanctuaries in Qinghai Lake basin of Qinghai Province and Lintan region of Gansu Province during the Quaternary glaciations, and suggests that the Quaternary climate change and QTP uplift shape the modern geographical distribution pattern of X. subacaulis.

Key words: Xanthopappus subacaulis, genetic structure, dynamic history, chloroplast DNA, Qinghai-Tibet Plateau

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