Short-term uptake of dissolved organic nitrogen by an axenic strain of Ulva pertusa (Chlorophyceae) using [15]N isotope measurements
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Kenji Tarutani
Abstract
Uptake rates of dissolved organic nitrogen (DON; urea, alanine and glutamate) by Ulva pertusa were determined using axenic cultures and 15N isotopic tracers. When urea or alanine was added to N-starved cultures, the incorporation of 15N into algal tissue was found at all concentrations tested (0.5–40 μM). Maximum uptake rates were 7.92 and 3.00 μmol N g−1 dw h−1, and half-saturation constants were 25.5 and 27.6 μM for urea and alanine, respectively. These results show that U. pertusa can take up urea and alanine directly without bacterial decomposition to inorganic nitrogen. Therefore, U. pertusa is able to utilize certain species of DON, and has the potential to regulate DON fluxes and transformations in coastal environments.
Copyright © 2004 by Walter de Gruyter GmbH & Co. KG
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Artikel in diesem Heft
- Dinoflagellate cysts in recent marine sediments from Scapa Flow, Orkney, Scotland
- Dinoflagellate cysts in recent marine sediments from the east coast of Russia
- Variation in chemical defenses against herbivory in southwestern Atlantic Stypopodium zonale (Phaeophyta)
- Seasonal variations in fatty acid composition of Caulerpa taxifolia (M. Vahl.) C. Ag. in the northern Adriatic Sea (Malinska, Croatia)
- Chemical composition and biological activity of the brackish-water green alga Cladophora rivularis (L.) Hoek
- Ultrastructure of tetrasporogenesis in the red alga Rhodymenia californica var. attenuata (Rhodymeniaceae, Rhodymeniales, Rhodophyta)
- Organisation of the microtubular cytoskeleton in protoplasts from Palmaria palmata (Palmariales, Rhodophyta)
- Thalassiosira fryxelliae nov. spec. (Bacillariophyceae) from Argentinian coastal waters
- Short-term uptake of dissolved organic nitrogen by an axenic strain of Ulva pertusa (Chlorophyceae) using [15]N isotope measurements
- The occurrence of Boodleopsis vaucherioidea Calderón-Sáenz et Schnetter (Udoteaceae, Chlorophyta) in Brazil
- First record of Undaria pinnatifida (Harvey) Suringar (Laminariales, Phaeophyta) on the Pacific coast of Mexico
- World atlas of seagrasses
- The genus Dictyota (Dictyotales, Phaeophyta) in the Indian Ocean
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