CO2exchange,14CO2fixation and radioactive photosynthetic products ofAnacystis nidulans(strain L 1402-1) were studied during the induction period at +30° C. The algae were grown at +35° C in an atmosphere of 0.03 or 3.0 vol.- CO2and were measured under conditions of low CO2concentrations. At the beginning of the photosynthetic period14CO2was mainly incorporated into aspartate and glutamate. The patterns of labelling are very similar to those of the C4pathway of photosynthesis. α-Hydroxypyridylmethane-sulfonic acid (10-5M) and isonicotinyl hydrazide (10-2M) have only a small effect on the percentage distribution of labelled products. The activities of glycolate dehydrogenase, ribulose-1,5-diphosphate carboxylase and phosphoenolpyruvate carboxylase, measured in crude extracts ofAnacystis, were inhibited by α-hydroxypyridylmethane-sulfonic acid and dichlorophenyldimethyl u
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