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Nitrogen uptake kinetics of Prymnesium parvum (Haptophyte)
Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences. (MPEA)
Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences. (MPEA)
University of Maryland, Horn Point Laboratory, Cambridge, USA. (Center for Environmental Science)
2011 (English)In: Harmful Algae, ISSN 1568-9883, E-ISSN 1878-1470, Vol. 12, p. 70-76Article in journal (Refereed) Published
Abstract [en]

The uptake rates of different nitrogen (N) forms (NO3-, urea, and the amino acids glycine and glutamicacid) by N-deficient, laboratory-grown cells of the mixotrophic haptophyte, Prymnesium parvum, weremeasured and the preference by the cells for the different forms determined. Cellular N uptake rates(rcell, fmol N cell-1 h-1) were measured using 15N-labeled N substrates. P. parvum showed highpreference for the tested amino acids, in particular glutamic acid, over urea and NO3 under the culturenutrient conditions. However, extrapolating these rates to Baltic Seawater summer conditions, P. parvumwould be expected to show higher uptake rates of NO3- and the amino acids relative to urea because ofthe difference in average concentrations of these substrates. A high uptake rate of glutamic acid at lowsubstrate concentrations suggests that this substrate is likely used through extracellular enzymes.Nitrate, urea and glycine, on the other hand, showed a non-saturating uptake over the tested substrateconcentration (1–40 mM-N for NO3- and urea, 0.5–10 mM-N for glycine), indicating slower membranetransportrates for these substrates

Place, publisher, year, edition, pages
Elsevier, 2011. Vol. 12, p. 70-76
Keywords [en]
Amino acids 15N uptake Nitrogen uptake Prymnesium parvum Urea
National Category
Ecology
Research subject
Natural Science, Aquatic Ecology
Identifiers
URN: urn:nbn:se:lnu:diva-18055DOI: 10.1016/j.hal.2011.09.001Scopus ID: 2-s2.0-81455131552OAI: oai:DiVA.org:lnu-18055DiVA, id: diva2:510869
Available from: 2012-03-19 Created: 2012-03-19 Last updated: 2017-12-07Bibliographically approved

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Lindehoff, ElinGranéli, Edna

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