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

• Published in: Current genetics Vol. 20; no. 5; p. 427
• Main Authors: Markowicz, Y. (Joseph Fourier Univ., Grenoble (France). Lab. de Biochimie des Micro-Organismes), Loiseaux-de Goer, S
• Format: Journal Article
• Language: English
• Published: United States 01.11.1991
• Subjects: Algae; Base Sequence; CHLOROPHYCEAE; Chloroplasts - metabolism; Composite poly-endosymbiosis; Cyanobacteria - classification; Cyanobacteria - genetics; DNA; Eukaryota - classification; Eukaryota - genetics; FILOGENIA; Gram-Negative Bacteria - classification; Gram-Negative Bacteria - genetics; MASTIGOPHORA; Molecular phylogeny; Molecular Sequence Data; PHYLOGENIE; PHYLOGENY; PLASTE; Plastid origin; PLASTIDIOS; PLASTIDS; RHODOPHYCEAE; RNA, Ribosomal, 16S - genetics; Sequence Homology, Nucleic Acid; SIMBIOSIS; SYMBIOSE; SYMBIOSIS
• ISSN: 0172-8083; 1432-0983
• DOI: 10.1007/BF00317073

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 beta-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.