Effects of light intensity on nitrate and nitrite uptake and excretion byChaetoceros curvisetus

✍ Scribed by S. M. Anderson; O. A. Roels

• Publisher: Springer-Verlag
• Year: 1981
• Tongue: English
• Weight: 491 KB
• Volume: 62
• Category: Article
• ISSN: 0025-3162
• DOI: 10.1007/bf00397692

✦ Synopsis

Michaelis-Menten uptake kinetics were observed at all light intensities. With constant illumination, the Vma x and K I in nitrate uptake over the natural light intensity range of 0 to 2000 pE were 0.343 pg-at NO3-N~g) -1 at protein-N h q and 26 #E, respectively. Nitrate uptake was inhibited at higher light intensities. The Ks for nitrate uptake did not vary as a function of light intensity remaining relatively constant at 0.62 pg-at NO3-N 1-1 . With intermittent illumination, the Vma x for light intensity in nitrate uptake over a light intensity range of 0 to 5000 pE was 0.341 #g-at NOa-N(#g)-Lat protein-N h -1 . No inhibition of nitrate uptake was observed at higher than natural light intensities. Chaetoceros eurvisetus will probably never experience light inhibition of nitrate uptake under natural conditions.