Various substituted 9,10-anthraquinones were tested for their inhibitory activity on photosystem II electron transport. Maximal inhibitory activity was achieved if the positions adjacent to one of the quinone carbonyl groups were unsubstituted or substituted by hydroxyl groups only. The best anthraquinone type inhibitor found so far was 2,3,4-trichloro-lhydroxy-anthraquinone with a pl,, value of 7.75. This is well comparable to the most powerful known photosystem II
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