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Journal of Molecular Evolution

, Volume 45, Issue 6, pp 688–695 | Cite as

Analysis of the Cluster of Ribosomal Protein Genes in the Plastid Genome of a Unicellular Red Alga Cyanidioschyzon merolae: Translocation of the str Cluster as an Early Event in the Rhodophyte-Chromophyte Lineage of Plastid Evolution

  • Niji  Ohta
  • Naoki  Sato
  • Hisayoshi  Nozaki
  • Tsuneyoshi  Kuroiwa

Abstract.

The nucleotide sequence of a cluster of ribosomal protein genes in the plastid genome of a unicellular red alga, Cyanidioschyzon merolae, which has been supposed to be the most primitive alga, was determined. The phylogenetic tree inferred from the amino acid sequence of ribosomal proteins of two rhodophytes, a chromophyte, a glaucophyte, two chlorophytes (land plants), a cyanobacterium, and three eubacteria suggested a close relationship between the cyanobacterium Synechocystis PCC6803 and the plastids of various species in the kingdom Plantae, which is consistent with the hypothesis of the endosymbiotic origin of plastids. In this tree, the two species of rhodophytes were grouped with the chromophyte, and the glaucophyte was grouped with the chlorophytes. Analysis of the organization of the genes encoding the ribosomal proteins suggested that the translocation of the str cluster occurred early in the lineage of rhodophytes and chromophytes after these groups had been separated from chlorophytes and glaucophytes.

Key words: Cyanidiophyceae —Cyanidioschyzon merolae— Plastid genome — Protoflorideophyceae — Ribosomal protein — Translocation of str cluster 

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Copyright information

© Springer-Verlag New York Inc. 1997

Authors and Affiliations

  • Niji  Ohta
    • 1
  • Naoki  Sato
    • 2
  • Hisayoshi  Nozaki
    • 3
  • Tsuneyoshi  Kuroiwa
    • 3
  1. 1.School of Human Science, Waseda University, 2-579-15 Mikajima, Saitama, 359 JapanJP
  2. 2.Department of Biochemistry and Molecular Biology, Faculty of Science, Saitama University, 255 Shimo-Ohkubo Urawa, Saitama, 338 JapanJP
  3. 3.Department of Biological Sciences, Graduate School of Sciences, University of Tokyo, 7-3-1 Hongo, Tokyo, 113 JapanJP

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