Carbon dioxide fixation in isolated kalanchoe chloroplasts.
Chloroplasts isolated from Kalanchoe diagremontiana leaves were capable of photosynthesizing at a rate of 5.4 mumoles of CO(2) per milligram of chlorophyll per hour. The dark rate of fixation was about 1% of the light rate. A high photosynthetic rate was associated with low starch content of the leaves. Ribose 5-phosphate, fructose 1,6-diphosphate, and dithiothreitol stimulated fixation, whereas phosphoenolpyruvate and azide were inhibitors. The products of CO(2) fixation were primarily those of the photosynthetic carbon reduction cycle.
Levi
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Department of Biology, Brandeis University, Waltham, Massachusetts 02154.
Gibbs
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