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Scientific article
Letter
English

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

Published inFEBS Letters, vol. 416, no. 1, p. 65-68
Publication date1997
Abstract

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.

Keywords
  • Chlamydomonas
  • Photosystem I
  • Photosystem II
  • Gene deletion
  • O2 exchange
  • CO2 exchange
Citation (ISO format)
COURNAC, Laurent et al. Limited photosynthetic electron flow but no CO<sub>2</sub> fixation in <i>Chlamydomonas</i> mutants lacking photosystem I. In: FEBS Letters, 1997, vol. 416, n° 1, p. 65–68. doi: 10.1016/S0014-5793(97)01170-8
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Article (Published version)
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ISSN of the journal0014-5793
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