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On the induction of nitrate reductase ec 1.6.6.1 and nitrite reductase ec 1.6.6.4 in synchronized chlorella cultures



On the induction of nitrate reductase ec 1.6.6.1 and nitrite reductase ec 1.6.6.4 in synchronized chlorella cultures



Planta (Heidelberg) 132(3): 285-290



Nitrate- and nitrite-reductase (EC 1.6.6.1 and EC 1.6.6.4) activities were determined during the light-dark changes in 2 completely synchronized Chlorella strains. A sharp increase of both enzyme activities durng the 1st light hour was found in C. vulgaris F tertia, a smaller one in C. pyrenoidosa. The rise in enzyme activity could only be inhibited by actidione but not by antibiotics which inhibit plastidic protein synthesis. Light may cause a de novo synthesis of both enzymes on cytoplasmic ribosomes. It is assumed that light effects a release of substances to the cytoplasm, probably formed during CO2-fixation, which can effect a cytoplasmic protein synthesis.

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