Abstract
The electron transfer resulting from illumination and dark storage of PS II has been studied using EPR signals from several electron carriers. The recombination of D + (Signal II) and Q − A formed by illumination occurred during dark storage at 77 K and was used to deplete reaction centres of D +. The donor D was then shown to be oxidized in the dark by the S 2 state of the oxygen-evolving complex. A slow change which occurred during dark storage of PS II samples was detected using the power saturation characteristics of D. We interpret this effect on D to be an indirect result of a rearrangement of the manganese complex during long-term dark adaptation. A role for D in the stability, protection and perhaps initial manganese binding of the oxygen-evolving complex is suggested.
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