The concentration of phospholipids in pigmented was higher than that in organisms lacking the photosynthetic pigments; the amounts of lipid phosphorus/mg. protein were, respectively, 157 and 90 mμmoles. Phosphatidylethanolamine comprised about 40% of the phospholipids, the remainder consisting of phosphatidic acid, phosphatidylglycerol and phosphatidylcholine. The phospholipids were confined to the membrane fraction of the organisms. As organisms adapted from the non-pigmented to the pigmented state the amount of lipid phosphorus/mg. protein increased. Experiments with radioactive phosphate showed phosphatidyl glycerol to incorporate label more rapidly than the other phospholipids. It is suggested that the formation of the photosynthetic pigments may be accompanied by modifications to the membrane structure so that it can accommodate more phospholipids.


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