Effect of carbon dioxide on pigment and membrane content in Synechococcus lividus

Larry S. Miller, Stanley C. Holt

Research output: Contribution to journalArticle

31 Scopus citations

Abstract

The effect of carbon dioxide on pigment and membrane content in Synechococcus lividus was studied by depriving cells of CO2 and examining cell populations biochemically and by electron microscopy. After 120 h of CO2 deprivation, S. lividus lost all detectable chlorophyll a and C-phycocyanin. Such bleached cultures were "mustard yellow", the result of approximately 1.8 times more carotenoid per cell than green control cultures. Although cells from beached cultures appeared morphologically identical to control green cells when examined by light microscopy, electron microscopic examination revealed them to be devoid of detectable thylakoid membrane. Thylakoid membrane could not be recovered by physical isolation or revealed by freeze etching of bleached S. lividus. In addition, inclusion bodies characteristically found in S. lividus were also absent. Reintroduction of CO2 into bleached cultures resulted in a rapid resynthesis of both chlorophyll a and C-phycocyanin. Electron microscopic examination of these regreening cultures revealed that thylakoid membrane was also rapidly resynthesized. Growth of regreened cultures did not occur until there was the synthesis of a full complement of chlorophyll a, C-phycocyanin, and thylakoid membrane. A time course study of the cytological events occurring during bleaching and regreening is presented.

Original languageEnglish (US)
Pages (from-to)185-198
Number of pages14
JournalArchives of Microbiology
Volume115
Issue number2
DOIs
StatePublished - Nov 1 1977
Externally publishedYes

Keywords

  • Bleaching-regreening
  • Carbon dioxide
  • Cyanobacteria
  • Electron microscopy
  • Synechococcus lividus

ASJC Scopus subject areas

  • Microbiology
  • Biochemistry
  • Molecular Biology
  • Genetics

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