Abstract
The sulfhydryl group-reagents NEM (N-ethylmaleimide), p-CMBS (parachloromercurybenzenesulfonate), Ag+ and Cu2+ inhibit very rapidly and drastically photosynthetic O2 evolution inElodea densa leaves. This effect has been compared with that of the same reagents in inducing in non illuminated leaves a strong increase of O2 consumption (oxygen burst), presumably due to activation of some plasma membrane redox systems. The results suggest that the structures and mechanisms involved in induction of the oxidative burst on one hand and in the inhibition of photosynthesis on the other are substantially independent.
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