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Phlorotannin Production and Lipid Oxidation as a Potential Protective Function Against High Photosynthetically Active and UV Radiation in Gametophytes of Alaria esculenta (Alariales, Phaeophyceae)
Department of Marine Botany, University of Bremen, Bremen, Germany / Section Functional Ecology, Department Seaweed Biology, Alfred-Wegener Institute for Polar and Marine Research, Bremerhaven, Germany.
Section Ecological Chemistry, Alfred-Wegener Institute for Polar and Marine Research, Bremerhaven, Germany.
Mathematical Sciences, Chalmers University of Technology and the University of Gothenburg, Sweden.
Department of Marine Botany, University of Bremen, Bremen, Germany.
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2012 (English)In: Photochemistry and Photobiology, ISSN 0031-8655, E-ISSN 1751-1097, Vol. 88, no 1, p. 46-57Article in journal (Refereed) Published
Abstract [en]

Radiation damage can inter alia result in lipid peroxidation of macroalgal cell membranes. To prevent photo-oxidation within the cells, photoprotective substances such as phlorotannins are synthesized. In the present study, changes in total fatty acids (FA), FA composition and intra/extracellular phlorotannin contents were determined by gas chromatography and the Folin-Ciocalteu method to investigate the photoprotective potential of phlorotannins to prevent lipid peroxidation. Alaria esculenta juveniles (Phaeophyceae) were exposed over 20 days to high/low photosynthetically active radiation (PAR) in combination with UV radiation (UVR) in the treatments: PAB (low/high PAR + UV-B + UV-A), PA (low/high PAR + UV-A) or low/high PAR only. While extracellular phlorotannins increased after 10 days, intracellular phlorotannins increased with exposure time and PA and decreased under PAB. Interactive effects of time:radiation wavebands, time:PAR dose as well as radiation wavebands:PAR dose were observed. Low FA contents were detected in the PA and PAB treatments; interactive effects were observed between time:high PAR and PAB:high PAR. Total FA contents were correlated to extra/intracellular phlorotannin contents. Our results suggest that phlorotannins might play a role in intra/extracellular protection by absorption and oxidation processes. Changes in FA content/composition upon UVR and high PAR might be considered as an adaptive mechanism of the A. esculenta juveniles subjected to variations in solar irradiance.

Place, publisher, year, edition, pages
John Wiley & Sons, 2012. Vol. 88, no 1, p. 46-57
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URN: urn:nbn:se:liu:diva-140866DOI: 10.1111/j.1751-1097.2011.01004.xOAI: oai:DiVA.org:liu-140866DiVA, id: diva2:1140920
Available from: 2015-01-19 Created: 2017-09-13Bibliographically approved

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