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EFFECTS OF CCCP ON PHOTOSYNTHESIS AND ON ACTIVE AND PASSIVE CHLORIDE TRANSPORT AT THE PLASMALEMMA OF HYDRODICTYON AFRICANUM
Author(s) -
RAVEN J. A.,
GLIDEWELL S. M.
Publication year - 1975
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1975.tb01388.x
Subject(s) - photophosphorylation , dcmu , electron transport chain , photosynthesis , biophysics , photosystem ii , chemistry , chloride , active transport , membrane transport , biology , chloroplast , biochemistry , membrane , organic chemistry , gene
SUMMARY CCCP inhibits photosynthetic CO 2 fixation more than photosynthetic O 2 evolution in Hydrodictyon africanum , while the photosystem two inhibitor, DCMU, inhibits the two processes equally. These results are consistent with CCCP acting as an uncoupler of photophosphorylation, thereby inhibiting CO 2 fixation, and the remaining O 2 evolution being associated with the ATP‐independent reduction of some (unknown) electron acceptor. Analysis of tracer chloride fluxes at the plasmalemma into active influx, exchange diffusion and passive uniport components supports previous conclusions, based on the assumption that all the tracer influx was due to active transport, that active chloride influx is relatively ATP‐independent. Some problems inherent in the occurrence of redox‐coupled active transport at the plasmalemma of eukaryotes are discussed, and a scheme which accounts for active chloride transport at the plasmalemma of H. africanum is proposed.