Abstract
Isolated envelope membranes of spinach chloroplasts (Spinacia oleracea L. var. Viroflay) exhibited selective permeability. Metabolites such as 3-phosphoglycerate, bicarbonate, glyoxylate, and acetate were transported rapidly; 6-phosphogluconate, glycolate, glycine, l-malate, and succinate were intermediate; whereas glucose 6-phosphate, fructose 1,6-diphosphate, and sucrose were hardly transported. Transport rates, metabolite accumulations within the membrane vesicles, and the internal water volume of isolated and in situ envelope membranes were compared and found to show similar trends.
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