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Nitrogen uptake kinetics of freshly isolated zooxanthellae

DRS at CSIR-National Institute of Oceanography

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Title Nitrogen uptake kinetics of freshly isolated zooxanthellae
 
Creator Wafar, M.V.M.
Wafar, S.
Rajkumar, R.
 
Subject coral
zooxanthellae
nitrogen fixation
nitrates
ammonia
urea
Pocillopora damicornis
 
Description Zooxanthellae freshly isolated from the coral host Pocillopora damicornis exhibited substrate-saturable uptake kinetics for ammonium, nitrate and urea. Maximum uptake velocity for ammonium [10.1 nmol. ( mu chl-a)./1h/1] was greater than that for nitrate [2.8 nmol. ( mu chl-a)./1h/1] and urea [0.37 nmol. ( mu chl-a)./1h/1]. Half-saturation constants for uptake of the three nitrogen compounds were in the range of 10-15 mu mol.l/1. Generally, uptake of any one nitrogen substrate appears to be inhibitEd. by the other 2 substrates when the latter are present in higher concentrations. The observed interactions can be explainEd. by the uncompetitive model. These results are interpreted as indicative of a simultaneous uptake of all 3 nitrogen compounds by the zooxanthellae
 
Date 2009-05-06T10:30:04Z
2009-05-06T10:30:04Z
1993
 
Type Journal Article
 
Identifier Indian Journal of Marine Sciences, Vol.22(2); 83-88p.
http://drs.nio.org/drs/handle/2264/2786
 
Language en
 
Rights Copyright [1993]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher NISCAIR, New Delhi