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Origin of the algae.

R Perasso1, A Baroin, L H Qu

  • 1Laboratoire de Biologie Cellulaire 4 (URA 25 CNRS), Université Paris Sud, Orsay, France.

Nature
|May 11, 1989
PubMed
Summary
This summary is machine-generated.

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This study reveals that major algal groups (rhodophytes, chromophytes, chlorophytes) evolved late in eukaryotic history, suggesting a later origin for eukaryotic photosynthesis. Evolutionary relationships among algae are clarified.

Area of Science:

  • Eukaryotic evolutionary biology
  • Phylogenetics
  • Protistology

Background:

  • Traditional classification separates eukaryotic algae into rhodophytes, chromophytes, and chlorophytes.
  • Evolutionary links between these algal groups and other eukaryotes are debated.
  • Understanding algal evolution is key to understanding early eukaryotic diversification.

Purpose of the Study:

  • To analyze evolutionary relationships among major eukaryotic algal divisions.
  • To investigate the timing of algal diversification within eukaryotes.
  • To clarify phylogenetic links between different algal and other eukaryotic groups.

Main Methods:

  • Partial sequences of large (28S) cytoplasmic ribosomal RNA were analyzed.
  • Data from ten new unicellular algae species were combined with 14 other eukaryotic sequences.

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  • Phylogenetic analyses were performed to reconstruct evolutionary relationships.

    • Main Results:

    • Rhodophytes, chromophytes, and chlorophytes form three distinct evolutionary lineages.
    • These algal groups diverged late in eukaryotic evolution, near the metazoa-metaphytes radiation.
    • Intra- and inter-phyla relationships within algae were detailed.

    Conclusions:

    • Eukaryotic photosynthetic symbiosis likely occurred relatively late in evolutionary history.
    • The study provides a refined phylogenetic framework for understanding algal evolution.
    • This research clarifies the evolutionary placement of major algal groups within eukaryotes.