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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

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Title Effect of pre-incubation of nitrate and ammonium in cultures on nitrate reductase activity in marine red algae Gelidiella and Gracilaria from southeast coast of India
 
Creator Ganesan, M.
Mairh, O.P.
Rao, P.V.Subba
 
Description 232-236
Nitrate reductase (NR) activities of six agar yielding seaweeds viz. Gelidiella acerosa, Gracilaria corticata, G. crassa, G. edulis, G. foliifera and G. verrucosa pre-incubated in different concentrations (150, 300, 450, 600 and 750 µmol/l) of nitrate (NaNO3) and ammonium (NH4)2S2O8 (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 G. acerosa; 0.19 to 5.83 mmol/g (fr.wt.)/h in G. corticata; 0.23 to 9.99 mmol/g (fr.wt.)/h in G .crassa; 0.06 to 0.43 mmol/g (fr.wt.)/h in G. edulis; 0.37 to 19.92 mmol/g (fr.wt.)/h in G. foliifera and 0.74 to 10.54 mmol/g (fr.wt.)/h in G. verrucosa. Maximum NR activity was found at an optimum nitrate concentration of 600 µ mol/l in all five species of Gracilaria and at 450 µmol/l in Gelidiella acerosa. Nitrate enhanced NR activity in all six species of agarophytes. Ammonium suppressed NR activity in all algae except G. edulis in which no obvious difference was observed in NR activity between NO3 and NH4 added culture.
 
Date 2009-06-15T12:24:19Z
2009-06-15T12:24:19Z
2001-12
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/4626
 
Language en_US
 
Publisher CSIR
 
Source IJMS Vol.30(4) [December 2001]