Abstract
Low concentrations of CdCl 2 inhibited cyclic and non-cyclic photophosphorylation in spinach chloroplasts and depressed coupled electron transport to the basal level. The basal electron transport and the electron flow stimulated by several uncouplers, except arsenate, were not affected. The inhibitory effects of cadmium were reversed by dithiols like dithioerythritol or 2,3-dimercaptopropanol. The light-induced pH rise of chloroplast suspensions and the trypsin-activated Ca-ATPase were not affected by cadmium at the concentrations that inhibited ATP synthesis but the latter was affected by higher concentrations.
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