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植物研究 ›› 2022, Vol. 42 ›› Issue (6): 956-963.doi: 10.7525/j.issn.1673-5102.2022.06.005

• 系统与进化 • 上一篇    下一篇

基于单拷贝核基因的褐沙蒿遗传结构和谱系地理学分析

唐思如, 王铁娟(), 秀芳, 刘梦瑶, 张慧   

  1. 内蒙古师范大学生命科学与技术学院,内蒙古自治区高等学校生物多样性保护与可持续利用重点实验室,呼和浩特 010022
  • 收稿日期:2022-02-15 出版日期:2022-11-20 发布日期:2022-11-22
  • 通讯作者: 王铁娟 E-mail:wtj105@163.com
  • 作者简介:唐思如(1994—),女,硕士研究生,主要从事植物学研究。
  • 基金资助:
    内蒙古自治区自然科学基金项目(2019MS03041)

Genetic Structure and Phylogeography Analysis of Artemisia intramongolica Based on Single Copy Nuclear Genes

Siru TANG, Tiejuan WANG(), Fang XIU, Mengyao LIU, Hui ZHANG   

  1. College of Life Sciences and Technology,Inner Mongolia Normal University,Key Laboratory of Biodiversity Conservation and Sustainable Utilization for College and University of Inner Mongolia Autonomous Region,Hohhot 010022
  • Received:2022-02-15 Online:2022-11-20 Published:2022-11-22
  • Contact: Tiejuan WANG E-mail:wtj105@163.com
  • About author:TANG Siru(1994—),female,postgraduate,mainly engaged in botanical research.
  • Supported by:
    National Natural Science Foundation of Inner Mongolia(2019MS03041)

摘要:

褐沙蒿(Artemisia intramongolica)是我国浑善达克沙地重要的固沙植物。本研究利用转录组测序开发获得的直系同源单拷贝核基因c9065c7847对褐沙蒿8个自然种群进行群体遗传结构与谱系地理特征研究。结果表明:c9065c7847总长度分别为485、457 bp,具有14、19个变异位点,分别获得48、40种单倍型;褐沙蒿单倍型多样性Hd分别为0.871 6和0.934 8,各种群均在0.8以上;总核苷酸多样性π分别为0.008 2和0.005 9,各种群均在0.005以上,表明不论是种还是种群均有高的遗传多样性。AMOVA分析结果显示,基于c9065c7847,褐沙蒿分别有99.398%和98.908%的遗传变异存在于种群内,基因流Nm分别为6.810和7.270,远远大于1,说明褐沙蒿种群间基因交流十分广泛。c9065的分析结果Nst<Gstc7847虽然Nst>Gst,但差异不显著(P>0.05),说明褐沙蒿种群不存在明显的谱系地理结构。中性检验显示,2个核基因的Tajima’s D值均不显著(P>0.05),而Fu’s Fs值显著(P<0.05),结合歧点分布分析,反映出褐沙蒿在中性模式下经历有限的种群扩张。

关键词: 褐沙蒿, 单拷贝核基因, 遗传结构, 谱系地理

Abstract:

To investigate the genetic and phylogeography structure of Artemisia intramongolica, which was an important sand-fixing plant in Hunsandak sandy land in China, the homologous single-copy nuclear genes c9065 and c7847 were developed by transcriptome sequencing, and then eight natural populations of A. intramongolica were studied. The results showed that the total length of c9065 and c7847 were 485 bp and 457 bp, respectively, with 14 and 19 variable loci, and 48 and 40 haplotypes were obtained. Based on c9065 and c7847, the haplotype diversity(Hd) was 0.871 6 and 0.934 8, respectively, and all populations were above 0.8. The total nucleotide diversity(π) was 0.008 2 and 0.005 9, respectively, and all populations were above 0.005, indicating that both species and populations had high genetic diversity. The results of AMOVA analysis showed that 99.398% and 98.908% of genetic variation existed within the populations of A. intramongolica based on c9065 and c7847, respectively, with gene flow(Nm)of 6.810 and 7.270, respectively, much greater than 1, indicating that there was extensive gene exchange among populations of A. intramongolica. Based on c9065Nst<Gst, although Nst>Gst by c7847, but the difference was not significant(P>0.05), indicating that A.intramongolica population did not exist phylogeographic structure. The neutral test showed that Tajima’s D values for both nuclear geneswere all not significant(P>0.05), while Fu’s Fs values were all significant(P<0.05), and combined with the mismatch distribution analysis, A.intramongolica experienced limited population expansion under the neutral mode.

Key words: Artemisia intramongolica, single-copy nuclear genes, genetic structure, phylogeography

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