Limited photosynthetic electron flow but no CO2 fixation in Chlamydomonas mutants lacking photosystem I

Laurent Cournac, Kevin Redding, Pierre Bennoun, Gilles Peltier

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


By measuring O2 and CO2 exchange in mutants of the green alga Chlamydomonas reinhardtii in which genes encoding the reaction center of photosystem I (psaA or psaB) have been deleted, we found that a photosystem II-dependent electron flow using O2 as the final acceptor can be sustained in the light. However, in contrast with recent reports using other Chlamydomonas mutants (B4 and F8), we show here that CO2 fixation does not occur in the absence of photosystem I. By deleting the psaA gene in both B4 and F8 strains, we conclude that the ability of these mutants to fix CO2 in the light is due to the presence of residual amounts of photosystem I.

Original languageEnglish (US)
Pages (from-to)65-68
Number of pages4
JournalFEBS Letters
Issue number1
StatePublished - Oct 13 1997
Externally publishedYes


  • CO exchange
  • Chlamydomonas
  • Gene deletion
  • O exchange
  • Photosystem I
  • Photosystem II

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology


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