Tagesperiodische Schwankungen und lichtinduzierte Zunahme der Nitratreduktase-Aktivität bei Synchronkulturen von Ankistrodesmus braunii

Uptake and Reduction of Nitrate: Algae and Fungi

“…For unknown reasons nitrite assimilation in vivo is often more sensitive than nitrate uptake and reduction to uncouplers such as dinitrophenol (KESSLER 1964, HOFMANN 1972, so that dinitrophenol can be used in the dark for the in vivo assay of nitrate reductase (e.g. FISCHER and SIMONIS 1979). The competitive inhibition of nitrate uptake by nitrite and vice versa may lead to the conclusion that both anions are taken up via the same transport system, but in the algae this is unlikely: in Chlorella fusca the effects of monochromatic light were limited to nitrate (CALERO et al 1980) and in many algae the effect of ammonia is less pronounced on nitrite, uptake than on nitrate uptake.…”