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Light-induced ion uptake by spinach chloroplasts has been demonstrated by Nobel and Packer (1) using radioisotopes. An interdependent uptake of calcium and phosphate was observed under conditions favoring a light-triggered ATP hydrolysis. A light-induced uptake of sodium was found (1), which may occur by an exchange for potassium. 1 Mitochondria also manifest energy-dependent ion accumulation; deposits, presumably containing calcium, strontium, or barium, have been located within the mitochondria by electron microscopy (2-4). Recently, numerous electron-opaque particles were observed on the lamellae of spinach chloroplasts under conditions for strontium uptake (5). These particles increased in mean size as the illumination period was prolonged and were nearly absent in the dark. The present report compares the electronopaque particles on chloroplast lamellae in the presence of barium, calcium, and strontium, and shows as well the effect of illumination time on the size distribution of particles observed with barium. An at tempt to locate sodium deposits is mentioned °

ELECTRON MICROSCOPIC EVIDENCE FOR THE LOCATION AND AMOUNT OF ION ACCUMULATION BY SPINACH CHLOROPLASTS