Spheroid bodies in rhopalodiacean diatoms were derived from a single endosymbiotic cyanobacterium

Takuro Nakayama, Yuko Ikegami, Takeshi Nakayama, Ken ichiro Ishida, Yuji Inagaki, Isao Inouye

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Members of the diatom family Rhopalodiaceae possess cyanobacteria-derived intracellular structures called spheroid bodies (SBs) that very likely carry out nitrogen fixation. Due to the shortage of molecular data from SBs and rhopalodiacean diatoms, it remains unclear how SBs were established and spread in rhopalodiacean diatoms. We here amplified the small subunit ribosomal DNA sequences from both host and SB in three rhopalodiacean diatom species, Epithemia turgida, E. sorex, and Rhopalodia gibba. Phylogenetic analyses considering these new sequences clearly indicate that the SBs were acquired by a common ancestor of rhopalodiacean diatoms and have been retained during host speciation.

Original languageEnglish
Pages (from-to)93-97
Number of pages5
JournalJournal of Plant Research
Volume124
Issue number1
DOIs
Publication statusPublished - 2011 Jan 1
Externally publishedYes

Keywords

  • Cyanobacteria
  • Diatoms
  • Endosymbiosis
  • Nitrogen fixation
  • Organelle

ASJC Scopus subject areas

  • Plant Science

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