Salinity-dependent copy number increase of a marine cyanobacterial endogenous plasmid

Haruko Takeyama, J. Grant Burgess, Hiroaki Sudo, Koji Sode, Tadashi Matsunaga*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


A marine cyanobacterium Synechococcus sp. NKBG 042902 grown in the presence of various NaCl concentrations showed different plasmid profiles. This strain possesses a 2.7-kb endogenous plasmid pSY10, whose copy number increased five-fold when the salinity of the growth medium was increased from 0 to 3% NaCl. Cells were grown initially in a fresh water medium and then transferred to a NaCl supplemented medium. The copy number of pSY10 began to increase after 7 h of incubation in 3% NaCl BG11 medium. This phenomenon was specific to NaCl and did not occur when other osmotica such as KCl and sorbitol were used. This is the first report of a cyanobacterial plasmid with a salinity-dependent copy number.

Original languageEnglish
Pages (from-to)95-98
Number of pages4
JournalFEMS Microbiology Letters
Issue number1
Publication statusPublished - 1991 Dec 15
Externally publishedYes


  • Copy number
  • Marine cyanobacterium
  • Plasmid
  • Sodium chloride
  • Synechococcus

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology
  • Genetics


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