Open AccessLight Dependent Reduction of Pertechnetate (99TcO4−) by Broken Chloroplasts
Author(s) -
Johan F. Lembrechts,
G. Desmet
Publication year - 1986
Publication title -
plant physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.554
H-Index - 312
eISSN - 1532-2548
pISSN - 0032-0889
DOI - 10.1104/pp.81.4.1003
Subject(s) - ferredoxin , chloroplast , electron acceptor , acceptor , photochemistry , chemistry , photosynthesis , redox , physics , inorganic chemistry , enzyme , biochemistry , gene , condensed matter physics
Arguments are given for a ferredoxin-mediated reduction of TcO(4) (-), preponderantly into extractable Tc(V) complexes, by illuminated, broken chloroplasts. Photosynthetic O(2)- and NADP-reduction competitively inhibit Tc incorporation. As for O(2), the reaction can be stimulated by the auto-oxidizable electron acceptor methyl viologen. Furthermore TcO(4) (-) can function as terminal acceptor in the diaphorase reaction, with NADPH as electron donor.