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Plant Physiology 70:393-396 (1982)
© 1982 American Society of Plant Biologists

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Effects of the Relative Extrachloroplastic Concentrations of Inorganic Phosphate, 3-Phosphoglycerate, and Dihydroxyacetone Phosphate on the Rate of Starch Synthesis in Isolated Spinach Chloroplasts

Archie R. Portis, Jr.

United States Department of Agriculture, Agricultural Research Service, University of Illinois, Urbana, Illinois 61801, Department of Agronomy, University of Illinois, Urbana, Illinois 61801

The effect of external inorganic phosphate (Pi) on starch synthesis in isolated spinach (Spinacia oleracea American Hybrid No. 424) chloroplasts in the presence of millimolar concentrations of 3-phosphoglycerate (PGA) and/or dihydroxyacetone phosphate (DAP) was examined. Whereas CO2 fixation was relatively constant as the ratio of the external phosphate to the PGA + DAP varied from 1:3 to 3:1, starch synthesis varied from 17% to 2% of the CO2 fixation rate. With DAP alone, maximal starch synthesis was about 10% of the CO2 fixation rate. The data demonstrate that the Pi/(PGA + DAP) ratio in the cytoplasm of plant cells could serve to regulate the flow of newly fixed carbon into starch without alterations in the rate of CO2 fixation.




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Copyright © 1982 by the American Society of Plant Biologists