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Limited photosynthetic electron flow but no CO 2 fixation in Chlamydomonas mutants lacking photosystem I
Author(s) -
Cournac Laurent,
Redding Kevin,
Bennoun Pierre,
Peltier Gilles
Publication year - 1997
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(97)01170-8
Subject(s) - chlamydomonas reinhardtii , photosystem ii , chlamydomonas , photosystem i , mutant , photosynthesis , p700 , cytochrome b6f complex , carbon fixation , photosynthetic reaction centre , chemistry , biophysics , biology , photochemistry , botany , biochemistry , gene
By measuring O 2 and CO 2 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 O 2 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 CO 2 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 CO 2 in the light is due to the presence of residual amounts of photosystem I.