Treatment of thylakoid suspensions with Zn2+causes the appearance of an EPR signal due to Mn2+. The size of the signal was linearly correlated with the inhibition of oxygen evolution. Full inhibition appeared to correspond to the release of 2 Mn atoms/reaction centre of photosystem II. The released Mn2+remained associated with the chloroplast pellet on centrifugation and took several hours to equilibrate with the surrounding medium. The sequestered Mn2+does not appear to be in the thylakoid interior but in a more restricted hydrophilic compartment.
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Miller et al. (1983) studied this question.
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