Abstract
Tetraethylthiuram disulfide (disulfiram) stimulated medium acidification when added at a concentration of 0.4 millimolar to illuminated or nonilluminated suspensions of Asparagus sprengeri Regel mesophyll cells. Similar concentrations inhibited photosynthesis and cyanide-resistant respiration. The reduction product of disulfiram, diethyldithiocarbamic acid, accumulated in concentrations sufficient to account for the observed acidification.