title: Photoreactions of cytochrome b563 and f554 in intact spinach chloroplasts: regulation of cyclic electron flow.
abstract: In intact spinach chloroplasts cytochrome b563 and cytochrome f show an antagonistic redox behaviour in the extent and kinetics of light/dark-induced absorbance changes. The extent of cytochrome b563 photoreduction appears to be influenced by the redox state of plastoquinone suggesting a regulation of cyclic electron flow at this level. Far-red illumination induces a membrane state with altered redox reactions of both cytochromes at a more oxidized level.
mesh_terms: D002736:Chloroplasts / Q000201:enzymology*; D003580:Cytochromes / Q000378:metabolism*; D004237:Diuron / Q000494:pharmacology; D004579:Electron Transport; D007700:Kinetics; D010084:Oxidation-Reduction; D010788:Photosynthesis; D010944:Plants; D013053:Spectrophotometry
chemical_list: D003580:Cytochromes; D004237:Diuron