1529-8817/asset/cover.gif?v=1&s=a2f09cd7b65e814ec648714612a7d81fffe36a3f "Journal of Phycology")
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UPTAKE OF INORGANIC NITROGEN BY CODIUM FRAGILE SUBSP. TOMENTOSOIDES (CHLOROPHYTA)†
Article first published online: 6 APR 2006
DOI: 10.1111/j.1529-8817.1978.tb02467.x
Additional Information
How to Cite
Hanisak, M. D. and Harlin, M. M. (1978), UPTAKE OF INORGANIC NITROGEN BY CODIUM FRAGILE SUBSP. TOMENTOSOIDES (CHLOROPHYTA). Journal of Phycology, 14: 450–454. doi: 10.1111/j.1529-8817.1978.tb02467.x
- †
Accepted 3 June 1978.
Publication History
- Issue published online: 6 APR 2006
- Article first published online: 6 APR 2006
- Abstract
- References
- Cited By
Keywords:
- ammonium uptake;
- Codiales;
- Codium;
- Chlorophyta;
- nitrate uptake;
- nitrite uptake;
- nitrogen
ABSTRACT
The uptake of nitrate, nitrite and ammonium by Codium fragile subsp. tomentosoides (van Goor) Silva was measured at different combinations of temperature (6–30 C) and irradiance (0–140 μEin.m-2. s-1). Uptake of all three forms of N was greater at 12–24 C than at 6 and 30 C. Although uptake was stimulated by light, saturation occurred at relatively low irradiance (7–28 μEin m-2 s-1, depending on the N source and temperature). The Michaelis-Menten uptake constants (Vmax K)varied with temperature. Vmax was greatest at intermediate temperatures and K was lowest at lower temperatures. The Vmaxfor NH4+ was higher and the K, for NH4+was lower than those for NO3-- and NO2--. Codium was capable of simultaneously taking up all three forms of inorganic N although the presence of NH4+ reduced the uptake of both NO3-- and NO2--. The results of this study indicate that part of the ecological success of Codium in a N-limited environment may be due to its N uptake capabilities.