Rate of exchange of Cl− between the aqueous phase and its action site in the O2 evolving reaction of photosystem II studied by rapid, ionic‐jump‐induced Cl− depletion

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Abstract
Rates of release and binding of Cl− from/to its action site in the O2 evolving reaction in photosystem II particles derived from spinach chloroplasts were estimated by measuring the suppression of O2 evolution by salt addition (ionic‐jump) and its recovery by the readdition of Cl−. It was estimated that depletion and rebinding of Cl− were completed within a few seconds. These results suggest that the Cl−‐action site is located in a space which is almost freely accessible to various ions in the outer medium, with no barrier to ion movements. These results can be explained by electrostatic attraction of Cl− to its action site, as was proposed in a study of anion effects on O2 evolution [(1986) Plant Cell Physiol. 27, in press].

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