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首页> 外文期刊>Current Biology: CB >The Interrelationships of Land Plants and the Nature of the Ancestral Embryophyte
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The Interrelationships of Land Plants and the Nature of the Ancestral Embryophyte

机译：土地植物的相互关系及祖先胚胎的性质

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摘要

The evolutionary emergence of land plant body plans transformed the planet. However, our understanding of this formative episode is mired in the uncertainty associated with the phylogenetic relationships among bryophytes (hornworts, liverworts, and mosses) and tracheophytes (vascular plants). Here we attempt to clarify this problem by analyzing a large transcriptomic dataset with models that allow for compositional heterogeneity between sites. Zygnematophyceae is resolved as sister to land plants, but we obtain several distinct relationships between bryophytes and tracheophytes. Concate-nated sequence analyses that can explicitly accommodate site-specific compositional heterogeneity give more support for a mosses-liverworts clade, "Setaphyta,'' as the sister to all other land plants, and weak support for hornworts as the sister to all other land plants. Bryophyte monophyly is supported by gene concatenation analyses using models explicitly accommodating lineage-specific compositional heterogeneity and analyses of gene trees. Both maximum-likelihood analyses that compare the fit of each gene tree to proposed species trees and Bayesian supertree estimation based on gene trees support bryophyte monophyly. Of the 15 distinct rooted relationships for embryophytes, we reject all but three hypotheses, which differ only in the position of hornworts. Our results imply that the ancestral embryophyte was more complex than has been envisaged based on topologies recognizing liverworts as the sister lineage to all other embryophytes. This requires many phenotypic character losses and transformations in the liverwort lineage, diminishes inconsistency between phylogeny and the fossil record, and prompts re-evaluation of the phylogenetic affinity of early land plant fossils, the majority of which are considered stem tracheophytes.
机译：土地植物机构计划的进化出现改变了地球。然而，我们对这种形成性剧集的理解是在与细胞（Hornworts，Liverworts和苔藓）和气管植物（血管植物）中的系统发育关系相关的不确定性中。在这里，我们试图通过分析具有允许位点之间的组成异质性的模型的大型转录组数据集来阐明这个问题。 ZygnemaTophyceae被视为孤岛植物的姐妹，但我们在苔藓植物和气管化学之间获得了几种不同的关系。有关所有其他土地植物的念珠子，“塞塔塔”，可以对所有其他土地植物的妹妹，“Setaphyta”，“Setaphyta”，“Setaphyta”，“Setaphyta，”，以及对所有其他土地的妹妹的弱者支持，对所有其他土地植物的姐妹们的母猪，“Setaphyta”，“Setaphyta”，“Setaphyta，”的序列分析会产生更多的支持。植物。使用模型明确地适应基因树分析的基因级联分析通过基因级联分析来支持植物。最大似然分析比基于基因树的拟议物种树木和贝叶斯超学生估算的最大似然分析。支持苔藓植物。在胚胎的15个不同的根生根关系中，我们拒绝除了犀鸟的位置而异。我们的结果意味着祖先胚胎比识别利物曲线的拓扑更复杂。姐妹谱系到所有其他胚胎。这需要许多表型特征Liverwort谱系中的损失和转化，系统发育和化石记录之间的不一致减少，并提示重新评估早期植物化石的系统发育亲和力，其中大多数被认为是茎气管化学物质。

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  • 来源
    《Current Biology: CB》 |2018年第5期|共15页
  • 作者

    Puttick Mark N.; Morris Jennifer L.; Williams Tom A.; Cox Cymon J.; Edwards Dianne; Kenrick Paul; Pressel Silvia; Wellman Charles H.; Schneider Harald; Pisani Davide; Donoghue Philip C. J.;

  • 作者单位

    Univ Bristol Sch Earth Sci Life Sci Bldg Tyndall Ave Bristol BS8 1TQ Avon England;

    Univ Bristol Sch Earth Sci Life Sci Bldg Tyndall Ave Bristol BS8 1TQ Avon England;

    Univ Bristol Sch Biol Sci Life Sci Bldg Tyndall Ave Bristol BS8 1TQ Avon England;

    Univ Algarve Ctr Ciencias Mar P-8005319 Faro Portugal;

    Cardiff Univ Sch Earth &

    Ocean Sci Main Bldg Pk Pl Cardiff CF10 3AT S Glam Wales;

    Nat Hist Museum Dept Earth Sci Cromwell Rd London SW7 5BD England;

    Nat Hist Museum Dept Life Sci Cromwell Rd London SW7 5BD England;

    Univ Sheffield Dept Anim &

    Plant Sci Alfred Denny Bldg Sheffield S10 2TN S Yorkshire England;

    Nat Hist Museum Dept Life Sci Cromwell Rd London SW7 5BD England;

    Univ Bristol Sch Earth Sci Life Sci Bldg Tyndall Ave Bristol BS8 1TQ Avon England;

    Univ Bristol Sch Earth Sci Life Sci Bldg Tyndall Ave Bristol BS8 1TQ Avon England;

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  • 正文语种 eng
  • 中图分类 生物科学;
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