Nitrate Utilization by the Diatom Skeletonema costatum
- 1 December 1978
- journal article
- research article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 62 (6) , 991-994
- https://doi.org/10.1104/pp.62.6.991
Abstract
Nitrate utilization was characterized in N-deficient cells of the marine diatom S. costatum. To separate nitrate uptake from nitrate reduction, nitrate reductase activity was suppressed with tungstate. Neither nitrite nor the presence of amino acids in the external medium or darkness affects nitrate uptake kinetics. Ammonium strongly inhibits carrier-mediated nitrate uptake, without affecting diffusion transfer. A model is proposed for the uptake and assimilation of nitrate in S. costatum and their regulation by ammonium ions.This publication has 13 references indexed in Scilit:
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