生物多样性 ›› 2017, Vol. 25 ›› Issue (6): 675-682.doi: 10.17520/biods.2017042

• 研究报告 • 上一篇    下一篇

基于系统基因组学分析揭示早期陆生植物的复杂网状进化关系

舒江平1, 2, 刘莉1, 2, 沈慧2, 戴锡玲1, 王全喜1, 4, 严岳鸿2, 3, 4, *()   

  1. 1 上海师范大学生命与环境科学学院, 上海 200234
    2 上海辰山植物园, 中国科学院上海辰山植物科学研究中心, 上海 201602
    3 国家林业局华东野生濒危资源植物保育中心, 上海 201602
    4 上海市资源植物功能基因组学重点实验室, 上海 201602
  • 收稿日期:2017-02-18 接受日期:2017-06-20 出版日期:2017-06-20
  • 通讯作者: 严岳鸿 E-mail:yan.yh@126.com
  • 基金项目:
    上海市绿化和市容管局2015年科学技术项目(G152420)

The complex reticulate evolutionary relationships of early terrestrial plants as revealed by phylogenomics analysis

Jiangping Shu1, 2, Li Liu1, 2, Hui Shen2, Xiling Dai1, Quanxi Wang1, 4, Yuehong Yan2, 3, 4, *()   

  1. 1 College of Life and Environmental Sciences, Shanghai Normal University, Shanghai 200234
    2 Shanghai Chenshan Plant Science Research Center, Chinese Academy of Sciences; Shanghai Chenshan Botanical Garden, Shanghai 201602
    3 East China Wild Endangered Resources Plant Conservation Center, State Forestry Administration, Shanghai 201602
    4 Shanghai Key Laboratory of Plant Functional Genomics and Resources, Shanghai 201602
  • Received:2017-02-18 Accepted:2017-06-20 Online:2017-06-20
  • Contact: Yan Yuehong E-mail:yan.yh@126.com

植物由水生走向陆生的进化过程中经历了非常复杂的演化, 期间产生的大量基因的进化路线可能互不相同, 因此仅仅使用系统发育树无法呈现真实的演化关系。系统发育网络图能够清楚地展示包括垂直演化和水平演化在内的复杂网状进化关系。本文选取莱茵衣藻(Chlamydomonas reinhardtii)和4种陆生植物, 利用系统基因组学的方法, 筛选得到1,668个一对一直系同源基因, 重新构建了陆生植物的系统发育网状进化关系。结果发现, 使用不同的分析策略所得到的系统发育树不同; 对1,668个基因单独分析, 发现存在15种不同的拓扑结构; 对5个物种筛选得到的直系同源基因进行系统发育网络分析显示, 在非常稳健的系统发育网络图中, 仅仅5个物种就存在9个不同的分离支, 暗示着非常复杂的网状进化关系; 而且藻类植物与苔藓植物和石松类植物的分离支之间差异很小, 这可能是产生系统发育树冲突的原因之一, 也暗示着早期陆生植物发生了复杂的辐射演化。

关键词: 网状进化, 基因树冲突, 系统发育基因组学, 陆生植物演化, 转录组从头测序

Plants from aquatic to terrestrial ecosystems have undergone a very complex evolution, and their evolutionary pathways of large numbers of genes may be different from one another, so that traditional phylogenetic trees cannot show true evolutionary relationships. The phylogenetic network graph is a good solution to show the complex relationships of reticulate evolution, including vertical evolution and horizontal evolution. In this paper, we selected Chlamydomonas reinhardtii and four terrestrial plants, and screened 1,668 one-to-one orthologous genes to reconstruct the phylogenetic relationship of terrestrial plants based on phylogenomics. Results showed that phylogenetic trees were different based on different analysis strategies. The 1,668 genes were analyzed separately and 15 different topologies were found. The phylogenetic network of the orthologous genes obtained from the five species was analyzed, and the results showed that in a very robust phylogenetic network map, only five species have nine different split branches, suggesting a very complex evolutionary relationship network. Futhermore, the difference in split branches between algae and bryophytes or lycophytes is very small, which may be one of the reasons influencing the phylogenetic tree conflict, and implies that early terrestrial plants underwent a complex radiate evolution.

Key words: reticulate evolution, gene tree conflict, phylogenomics, terrestrial plant evolution, de novo transcriptome

表1

转录组和基因组组装完整性评估结果统计"

物种 Species 分类 Classification BUSCO评估结果 BUSCO results
福建观音座莲 Angiopteris fokiensis 真蕨类植物 Monilophytes C: 66.4% [S: 43.2%, D: 23.2%], F: 5.9%, M: 27.7%, n: 1440
欧洲云杉 Picea abies 种子植物 Spermatophytes C: 34.0% [S: 28.9%, D: 5.1%], F: 7.4%, M: 58.6%, n: 1,440
江南卷柏 Selaginella moellendorffii 石松类植物 Lycophytes C: 63.2% [S: 10.0%, D: 53.2%], F: 4.7%, M: 32.1%, n: 1,440
小立碗藓 Physcomitrella patens 苔藓植物 Bryophytes C: 70.1% [S: 46.0%, D: 24.1%], F: 2.6%, M: 27.3%, n: 1,440
莱茵衣藻 Chlamydomonas reintmrdtii 藻类植物 Thallophytes C: 18.8% [S: 17.9%, D: 0.9%], F: 1.7%, M: 79.5%, n: 1,440

图1

基于串联和联合的方法分析得到的系统发育树。(A)使用串联矩阵构建的最大似然树; (B)使用联合基因树构建的物种树。"

图2

使用最大似然法构建的15种拓扑结构的基因树。数字表示每种拓扑结构的数量。"

图3

基于1,668个基因构建的早期陆生植物的系统发育网络。数字表示每个分离支的支持率, 除了最短分离支(箭头)之外, 其他分离支的支持率都为100%; 平行的分离支为同一种分离支。"

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