Uptake of nitrite by C. fusca cells was considerable only in the light. Pre-starvation in the dark or permanent darkness was accompanied by very low rates of nitrite uptake. 2,4 dinitrophenol, an energy metabolism inhibitor, also inhibited nitrite uptake. Nevertheless, it is difficult to assume that nitrite uptake is an active process. Metabolic inhibitors having various targets in plant cell metabolism such as arsenate, cyanide, cyclohexamide and 6.methylpurine also inhibited nitrite uptake. A feedback inhibition of nitrite uptake was observed in the presence of glutamate or glutamine. The addition of NO3- or NH4+ competitively inhibited NO2- uptake. Therefore, NO2- uptake in C. fusca is conditioned by several factors.
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