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Variability in the response of the cyanobacterium Nodularia spumigena to nitrogen supplementation
Stockholm University, Faculty of Science, Department of Botany.
Stockholm University, Faculty of Science, Department of Botany.
2010 (English)In: Journal of Environmental Monitoring, ISSN 1464-0325, E-ISSN 1464-0333, Vol. 12, no 10, 1885-1890 p.Article in journal (Refereed) Published
Abstract [en]

Nodularia spumigena is a filamentous cyanobacterium that is commonly found in brackish water bodies. The species is capable of fixing atmospheric nitrogen in specialized cells termed heterocysts. N. spumigena dominates the annual toxic summer blooms in the Baltic Sea causing environmental and economical problems. We have previously demonstrated that N. spumigena strain AV1 exhibits a different response to the presence of combined nitrogen as compared to model cyanobacteria such as Nostoc PCC7120 and Nostoc punctiforme by uncoupling between nitrogen fixation and heterocyst differentiation. In order to assess whether or not the behaviour of N. spumigena strain AV1 is characteristic of N. spumigena populations, especially in the Baltic Sea, we have investigated the effect of nitrate and ammonium ions on growth, nitrogen fixation activity and presence of heterocysts in eight different Nodularia strains. Our results show that most of the strains retain heterocysts in the absence of nitrogenase activity indicating that uncoupling between nitrogen fixation and heterocyst differentiation is most likely a common behaviour among N. spumigena strains, especially in the Baltic Sea. In addition, there are variations between strains in regard to nitrate uptake.

Place, publisher, year, edition, pages
2010. Vol. 12, no 10, 1885-1890 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:su:diva-51741DOI: 10.1039/c002863kISI: 000282586100012OAI: oai:DiVA.org:su-51741DiVA: diva2:386097
Note
authorCount :2Available from: 2011-01-12 Created: 2011-01-12 Last updated: 2017-12-11Bibliographically approved

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