Effect of ammonia on photosynthetic carbon fixation in isolated spinach leaf cells

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Abstract
Ammonia stimulated photosynthetic 14CO2 fixation in isolated spinach cells under conditions of saturating light intensity and adequate CO2 supply. Increasing temperature increased photosynthesis and promoted the stimulation of photosynthesis by ammonia. Ammonia increased carbon traffic into organic acids and amino acids without affecting the total, 14C incorporation in the neutral fraction, although the relative distribution of 14C incorporation in the neutral fraction as a percentage of the total soluble 14C incorporation was decreased. The increased carbon flow into the amino acid fraction led to an increase of, 14C incorporation, principally into glutamine, glutamate, and aspartate. The role of ammonia in photosynthetic carbon metabolism is discussed.