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Nitrite Reduction in Reconstituted and Whole Spinach Chloroplasts during Carbon Dioxide Reduction ¹

^a Laboratory of Chemical Biodynamics, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

Nitrite reduction in either whole, isolated spinach chloroplasts (Spinacia oleracea L.) or in reconstituted spinach chloroplasts is stimulated by a short period of photosynthetic CO₂ fixation in the light prior to nitrite addition. With reconstituted chloroplasts, a similar stimulation can be obtained in nitrite reduction without CO₂ fixation by the addition of dihydroxyacetone phosphate or fructose 6-phosphate. Specific intermediate metabolites of the photosynthetic carbon reduction cycle may have a regulatory role in nitrite reduction in chloroplasts in the light.

³ Present address: Institute für Botanik, Technische Hochschule München, München, Germany.

⁴ Supported by Deutsche Forschungsgemeinschaft.

¹ The work described in this paper was supported, in part, by the United States Atomic Energy Commission.