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Phylogenetic analysis based on rRNA sequences supports the archaebacterial rather than the eocyte tree

Nature volume 339, pages 145147 (11 May 1989) | Download Citation

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Abstract

HOW many primary lineages of life exist and what are their evolutionary relationships? These are fundamental but highly controversial issues1. Woese and co-workers2–4 propose that archaebacteria, eubacteria and eukaryotes are the three primary lines of descent and their relationships can be represented by Fig. 1a (the 'archaebacterial tree') if one neglects the root of the tree. In contrast, Lake5,6 claims that archaebacteria are paraphyletic, and he groups eocytes (extremely thermophilic, sulphur-dependent bacteria) with eukaryotes, and halobacteria with eubacteria (the 'eocyte tree', Fig. 1b). Lake's view has gained considerable support as a result of an analysis6 of small subunit ribosomal RNA sequence data by a new approach, the evolutionary parsimony method7. Here we report that analysis of small subunit data by the neighbour-joining and maximum parasimony methods8,9 favours the archaebacterial tree and that computer simulations using either the archaebacterial or the eocyte tree as a model tree show that the probability of recovering the model tree is very high (>90 per cent) for both the neighbour-joining and maximum parsimony methods but is relatively low for the evolutionary parsimony method. Moreover, analysis of large subunit rRNA sequences by all three methods strongly favours the archaebacterial tree.

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Author information

Affiliations

  1. Center for Demographic and Population Genetics, University of Texas, PO Box 20334, Houston, Texas 77225, USA

    • Manolo Gouy
    •  & Wen-Hsiung Li
  2. Laboratoire de Biométrie, Université Lyon I, 69622 Villeurbanne Cedex, France

    • Manolo Gouy
  3. To whom correspondence should be addressed.

    • Wen-Hsiung Li

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https://doi.org/10.1038/339145a0

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