The origin of red algae and the evolution of chloroplasts - PubMed (original) (raw)

. 2000 May 4;405(6782):69-72.

doi: 10.1038/35011054.

Affiliations

• PMID: 10811219
• DOI: 10.1038/35011054

The origin of red algae and the evolution of chloroplasts

D Moreira et al. Nature. 2000.

Abstract

Chloroplast structure and genome analyses support the hypothesis that three groups of organisms originated from the primary photosynthetic endosymbiosis between a cyanobacterium and a eukaryotic host: green plants (green algae + land plants), red algae and glaucophytes (for example, Cyanophora). Although phylogenies based on several mitochondrial genes support a specific green plants/red algae relationship, the phylogenetic analysis of nucleus-encoded genes yields inconclusive, sometimes contradictory results. To address this problem, we have analysed an alternative nuclear marker, elongation factor 2, and included new red algae and protist sequences. Here we provide significant support for a sisterhood of green plants and red algae. This sisterhood is also significantly supported by a multi-gene analysis of a fusion of 13 nuclear markers (5,171 amino acids). In addition, the analysis of an alternative fusion of 6 nuclear markers (1,938 amino acids) indicates that glaucophytes may be the closest relatives to the green plants/red algae group. Thus, our study provides evidence from nuclear markers for a single primary endosymbiosis at the origin of these groups, and supports a kingdom Plantae comprising green plants, red algae and glaucophytes.

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Comment in

• A single birth of all plastids?
  Palmer JD. Palmer JD. Nature. 2000 May 4;405(6782):32-3. doi: 10.1038/35011184. Nature. 2000. PMID: 10811205 No abstract available.

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