Abstract
The effect of DMSO (dimethyl sulphoxide) on electron transport in chloroplast membranes has been studied. It has been found that concentrations of DMSO up to 20% ( v v ) do not inhibit electron transport in freshly isolated chloroplasts, but that higher concentrations start to cause inhibition. However, in chloroplasts that have been aged for 8 to 24 hours by storage at 4° C, the addition of DMSO at concentrations up to 20% causes stimulation of electron transport. Possible mechanisms for this effect are discussed.
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