Abstract
In synchronized cultures of Ankistrodesmus braunii, diurnal periodicity of nitrate reductase activity (NRA) is found in vivo, with a characteristic increase of activity at the beginning of the light period. Both the extent of this increase and the lag-phase before activity increases are influenced by the length of the preceding dark period. The results obtained with inhibitors of mRNA- and protein synthesis indicate that the light effect is related to a de novo-synthesis of nitrate reductase. A hypothesis has been developed concerning the regulation of NRA and the synthesis of NR-subunits in different compartments of the cells of light-dark-grown Ankistrodesmus.
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