Involvement of superoxide dismutase in heat-induced stimulation of photosystem I-mediated oxygen uptake.
We have investigated the effect of heat-treatment of chloroplast thylakoid membranes on photosystem I-mediated electron transport. Spectroscopic techniques, oxidation of dichlorophenolindophenol (donor side) and reduction of NADP or methyl purple (acceptor side), showed no indication of an increased activity of photosystem I electron transport. Enhancement of oxygen uptake in the heat-treated (40 degrees C-48 degrees C) samples could largely be accounted for by decline in the activity of superoxide dismutase.
Lajkó
F
F
Institute of Plant Physiology, Hungarian Academy of Sciences, Szeged.
Kadioglu
A
A
Garab
G
G
D002736:Chloroplasts / Q000378:metabolism*; D004237:Diuron / Q000494:pharmacology; D004579:Electron Transport; D006358:Hot Temperature; D007202:Indicators and Reagents; D007425:Intracellular Membranes / Q000378:metabolism; D007700:Kinetics; D010101:Oxygen Consumption / Q000187:drug effects; D045322:Photosynthetic Reaction Center Complex Proteins / Q000378:metabolism*; D045331:Photosystem I Protein Complex; D013482:Superoxide Dismutase / Q000378:metabolism*
D007202:Indicators and Reagents; D045322:Photosynthetic Reaction Center Complex Proteins; D045331:Photosystem I Protein Complex; D004237:Diuron; D013482:Superoxide Dismutase