Abstract
Abstract Thylakoids Incubated with sulphate show an inhibition of oxygen evolution. However, analysis of oxygen production patterns induced by flashes reveals that sulphate treatment does not modify the “miss probability” in the advancement of the S-state cycle. This indicates that the PSII inhibited by sulphate are completely blocked in oxygen evolution, while another part of PSII is left intact. Therefore, the measured oxygen yields originate only from unaffected PSII. Our interpretation is supported by fluorescence measurements, which show a decrease in PSIIalpha fluorescence, while the apparent rate of Qa reduction in active PSIIα is not changed after sulphate treatment. Thus, sulphate induces a complete shut-off of S-state transitions in a part of the PSIIα population, leaving the other part intact; PSIIβ were not affected. This implies that the antagonist actions of chloride and sulphate do not proceed through a fast equilibrium.
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