Plastid genomes of the Rhodophyta and Chromophyta constitute a distinct lineage which differs from that of the Chlorophyta and have a composite phylogenetic origin,perhaps like that of the Euglenophyta |
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Authors: | Yves Markowicz Susan Loiseaux de Goër |
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Affiliation: | (1) Laboratoire de Biochimie des Micro-Organismes, Université Joseph Fourier, BP 53X, F-38041 Grenoble Cédex, France;(2) Station Biologique de Roscoff, CNRS-UPR 4601, BP 74, F-29682 Roscoff Cédex, France |
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Abstract: | Summary A phylogenetic tree has been constructed from comparisons of entire 16S rRNA gene sequences from different prokaryotes and from several algal plastids. According to this study, and to previous work on the ribulose-1,5-bisphosphate carboxylase oxygenase (Rubisco) large and small subunit genes, we postulate that: (1) rhodophyte and chromophyte plastid genomes have a common, composite phylogenetic origin which implies at least two different ancestors, a cyanobacterial and a -proteobacterial ancestor; (2) chlorophyte (green algae and land plants) plastids have a cyanobacterial ancestor which probably differs from that of rhodophyte and chromophyte plastids, and in any case constitute a different lineage; (3) euglenophyte plastid genomes also seem to have a composite phylogenetic origin which involves two different lineages. |
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Keywords: | Algae Molecular phylogeny Plastid origins Composite poly-endosymbiosis |
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