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.
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