Links between Glucose Uptake and Metabolism inNitella translucens

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Abstract
The uptake of 14C-glucose into cells of Nitella translucens has been investigated under experimental conditions previously used in studies of the ionic relations of these cells. Glucose entry was considerably stimulated by light, and under aerobic conditions the fluxes remained constant for many hours. The influx of glucose was inhibited by over 80 per cent at low temperature (4° C) and by over 90 per cent by the uncoupler carbonyl cycanide-m-chlorophenylhydrazone. 2-Deoxy-D-glucose was a non-competitive inhibitor of glucose uptake both in light and darkness. Cyclic photophosphorylation promoted the influx (with decreasing efficiency) for several hours. It is suggested that an ATP-dependent transport process controls glucose entry to the cells, and that passive diffusion is of little significance.

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