Nuclear protein phylogenies support the monophyly of the three bryophyte groups (Bryophyta Schimp.)

Filipe de Sousa, Peter G. Foster, Philip Donoghue, Harald Schneider, Cymon J. Cox*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

26 Citations (Scopus)
161 Downloads (Pure)

Abstract

Unraveling the phylogenetic relationships between the four major lineages of terrestrial plants (mosses, liverworts, hornworts, and vascular plants) is essential for an understanding of the evolution of traits specific to land plants, such as their complex life cycles, and the evolutionary development of stomata and vascular tissue. Well supported phylogenetic hypotheses resulting from different data and methods are often incongruent due to processes of nucleotide evolution that are difficult to model, for example substitutional saturation and composition heterogeneity. We reanalysed a large published dataset of nuclear data and modelled these processes using degenerate-codon recoding and tree-heterogeneous composition substitution models. Our analyses resolved bryophytes as a monophyletic group and showed that the nonnonmonophyly of the clade that is supported by the analysis of nuclear nucleotide data is due solely to fast-evolving synonymous substitutions. The current congruence among phylogenies of both nuclear and chloroplast analyses lent considerable support to the conclusion that the bryophytes are a monophyletic group. An initial split between bryophytes and vascular plants implies that the bryophyte life cycle (with a dominant gametophyte nurturing an unbranched sporophyte) may not be ancestral to all land plants and that stomata are likely to be a symplesiomorphy among embryophytes.

Original languageEnglish
Pages (from-to)565-575
Number of pages11
JournalNew Phytologist
Volume222
Issue number1
Early online date9 Nov 2018
DOIs
Publication statusPublished - 1 Apr 2019

Keywords

  • bryophytes
  • compositional heterogeneity
  • land plants
  • life cycle
  • phylogenomics
  • substitutional saturation

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