Abstract
EPR measurements on inside-out thylakoids revealed that salt-washing, known to inhibit oxygen evolution and release a 23 and a 16 kDa protein, induced a Signal II f and decreased the EPR signal from state S 2. Readdition of the released 23 kDa protein restored the oxygen evolution and decreased the Signal II f, but did not relieve the decrease in the state S 2 signal. It is suggested that salt-washing inhibits the electron transfer from the oxygen-evolving site to Z, the physiological donor to P680. In inhibited photosystem II units lacking Signal II f, Z + is rapidly reduced, possibly by a modified S-cycle unable to evolve oxygen.
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