Inhibition of nitrate uptake by ammonia in a blue-green alga,Anabaena cylindrica |
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| Authors: | Masayuki Ohmori Kazuko Ohmori Heinrich Strotmann |
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| Affiliation: | (1) Abteilung für Biochemie der Pflanzen, Botanisches Institut der Tierärztlichen Hochschule Hannover, D-3000 Hannover, Germany;(2) Present address: The Ocean Research Institute, University of Tokyo, Nakano, 164 Tokyo, Japan;(3) Present address: Department of Biology, Faculty of Science, Tokyo Metropolitan University, 158 Tokyo, Japan |
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| Abstract: | Ammonia at concentrations above 1×10-5 M inhibits uptake of nitrate in the nitrogen-fixing blue-green alga, Anabaena cylindrica. This inhibition takes place both in the light and in the dark. The rate of nitrate uptake is stimulated by light. Addition of relatively high concentrations of nitrate (1–10 mM) reversibly inhibits ammonia uptake. FCCP, an uncoupler of phosphorylation, inhibits both nitrate and ammonia uptake. Ammonia may inhibit nitrate uptake by reducing the supply of energy (ATP) for active nitrate transport.Abbreviations FCCP carbonyl cyanide p-trifluoromethoxy-phenylhydrazone - CCCP carbonyl cyanide m-chlorophenyl-hydrazone |
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| Keywords: | Blue-green algae Nitrate transport Nitrate reduction |
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