The O -dinitrophenyl derivatives of 2 -bromo-and 2-iodo-4-nitrothymol are inhibitors of photo synthetic electron flow from water to NADP or methylviologen, yielding 50% inhibition at 0.5 μм. Photoreductions by either photosystem I or photosystem II alone are not inhibited. The inhibition site is bypassed by TM PD. The inhibition pattern identical to the one of dibromothymoquinone. It is reduction of plastoquinone.
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Trebst et al. (1978) studied this question.