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Effects of light on nitrate-limited Oscillatoria agardhii in chemostat cultures
Authors:Wanda Zevenboom  Gerard J. de Groot  Luuc R. Mur
Affiliation:(1) Laboratorium voor Microbiologie, Universiteit van Amsterdam, Nieuwe Achtergracht 127, NL-1018 WS Amsterdam, The Netherlands
Abstract:The effects of the average light irradiance (langIrang) on growth and nitrate uptake kinetics of the cyanobacterium Oscillatoria agardhii, in nitrate-limited chemostat cultures, were studied. Light was nonsaturating for langIrang <9.4 Wm–2, for all growth rates (mgr) studied. However, mgr was throughout limited by the availability of nitrate. Under light-saturating conditions the kinetics of nitrate-limited growth could be adequately described by both the Monod and Droop equations. Under light-non-saturating conditions the internal nitrogen content (Q) was a function of both mgr and langIrang, for which new formulas were derived. The high uptake capacity (Vmax) of nitrate-limited cells was independent of mgr, but was significantly increased for cells growing at langIrang <9.4 Wm–2. The half-saturation constant for nitrate uptake (Ksu) increased with increasing mgr, but was independent of the prevailing light conditions. The effects of light during nitrate-limited growth were associated with the regulation in the nitrogen-containing pigments.The results reported herein have important consequences for the use of Q, Ksu and Vmax values as indicators of nutrient-deficiency of natural populations.
Keywords:Oscillatoria agardhii  Cyanobacterium  Chemostat culture  Nitrate-limitation  Light-nonsaturation  Growth kinetics  Nitrate uptake kinetics
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