Differential Sensitivity Toward Sulfate Inhibition Among PSII Complexes in Barley Thylakoids
Oxygen evolution proceeds through a four step mechanism, the S-state cycle, with each step denoted by Sn, n varying between 0 and 3. The removal of chloride by sulfate incubation results in a reversible decrease of O2 evolution activity (1,2,3). Sulfate treatment of photosystem II (PSII) impairs the advancement of the S-state cycle to the S3 state (4,5). Under flashing light, the functionment of the OEC can be characterized by the probability of a ‘miss’ in the advancement of the S-states. Partial, random blockage of the S-state cycle rise the miss probability while the total blockage of a part of PSII centers (e.g. by DCMU) do not affect the miss probability (6).
KeywordsOxygen Evolution PSII Complex PSII Photochemistry Sulfate Treatment PSII Center
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