Abstract
The effect of 3-(3′,4′-dichlorophenyl)-1,1-dimethylurea concentration on reversal of the slow light-dependent quenching of chlorophyll a fluorescence and inhibition of oxygen evolution by intact chloroplasts was studied. Under some conditions the quenching was found to be less sensitive to DCMU than non-cyclic electron transport indicating the possible existence of in vivo coupled cyclic electron flow in intact chloroplasts. The coupled cyclic electron flow was easily inhibited by conditions which would be expected to cause overoxidation of natural electron carriers on the reducing side of photosystem 1. The addition of the artificial cofactor of cyclic electron flow, diaminodurene (DAD), to intact chloroplasts treated with high concentrations of DCMU, reinduced a strong energy-dependent quenching of chlorophyll a fluorescence which also supports the suggestion that intact chloroplasts are capable of carrying out coupled cyclic electron transport.
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