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Title: Effect of pre-incubation of nitrate and ammonium in cultures on nitrate reductase activity in marine red algae <i style="">Gelidiella </i>and <i style="">Gracilaria </i>from southeast coast of India
Authors: Ganesan, M.
Mairh, O.P.
Rao, P.V.Subba
Issue Date: Dec-2001
Publisher: CSIR
Abstract: Nitrate reductase (NR) activities of six agar yielding seaweeds viz. <i style="">Gelidiella acerosa, Gracilaria corticata, G. crassa, G. edulis, G. foliifera</i> and <i style="">G. verrucosa</i> pre-incubated in different concentrations (150, 300, 450, 600 and 750 µmol/l) of nitrate (NaNO<sub>3</sub>) and ammonium (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub> (700, 1400, 2100, 2800 and 3500 µmol/l) were studied. NR activity ranged from 0.07 to 24.72 mmol/g (f.wt)/h in <i style="">G. acerosa</i>; 0.19 to 5.83 mmol/g (fr.wt.)/h in <i style="">G. corticata</i>; 0.23 to 9.99 mmol/g (fr.wt.)/h in <i style="">G .crassa;</i> 0.06 to 0.43 mmol/g (fr.wt.)/h in <i style="">G. edulis; </i>0.37 to 19.92 mmol/g (fr.wt.)/h in <i style="">G. foliifera</i> and 0.74 to 10.54 mmol/g (fr.wt.)/h in <i style="">G. verrucosa.</i> Maximum NR activity was found at an optimum nitrate concentration of 600 µ mol/l in all five species of <i style="">Gracilaria</i> and at 450 µmol/l in <i style="">Gelidiella acerosa</i>. Nitrate enhanced NR activity in all six species of agarophytes. Ammonium suppressed NR activity in all algae except <i style="">G. edulis </i>in which no obvious difference was observed in NR activity between NO<sub>3</sub> and NH<sub>4</sub> added culture.
Description: 232-236
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.30(4) [December 2001]

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