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Effects of solar radiation on growth and mycosporine-like amino acids content in Thalassiosira sp, an Antarctic diatom Hernando, M.P.; Carreto, J.I.; Carignan, M.O.; Ferreyra, G.A.; Gross, C. (2002). Effects of solar radiation on growth and mycosporine-like amino acids content in Thalassiosira sp, an Antarctic diatom, in: Arntz, W.E. et al. (Ed.) Ecological studies in the Antarctic sea ice zone: results of EASIZ Midterm Symposium. pp. 237-245 In: Arntz, W.E.; Clarke, A. (Ed.) (2002). Ecological studies in the Antarctic sea ice zone: Results of EASIZ Midterm Symposium. Springer: Berlin. ISBN 3-540-43218-3. 277 pp. Is gerelateerd aan: Hernando, M.P.; Carreto, J.I.; Carignan, M.O.; Ferreyra, G.A.; Gross, C. (2002). Effects of solar radiation on growth and mycosporine-like amino acids content in Thalassiosira sp, an Antarctic diatom. Polar Biol. 25(1): 12-20. dx.doi.org/10.1007/s003000100306, meer

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Trefwoorden

Acids > Organic compounds > Organic acids > Amino acids Agents > Inhibitors Algae > Diatoms Biological phenomena > Adaptations > Acclimation Population functions > Growth Radiations > Electromagnetic radiation > Solar radiation Thalassiosira P.T. Cleve, 1873 emend. Hasle, 1973 [WoRMS] Potter Cove [Marine Regions] Marien/Kust

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Auteurs		Top
Hernando, M.P. Carreto, J.I. Carignan, M.O.	Ferreyra, G.A. Gross, C.

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Abstract

The main objective of this study was to investigate the role of mycosporine-like amino acids (MAAs) in the short-term (hours) and long-term (several days) photoacclimation to solar ultraviolet radiation (UVR) of a marine Antarctic diatom (Thalassiosira sp.). The cultures were exposed to natural solar radiation and grown over 72 h and 6 days under three experimental irradiance treatments: (1) photosynthetic available radiation (PAR) + UVR (280-700 nm), (2) PAR + UVA (315-700 nm), and (3) PAR (400-700 nm). Two MAAs were identified and quantified in the cells: porphyra-334 and shinorine. The cultures showed an initial period of growth inhibition and the rate of synthesis of MAAs (µ) was very high in all treatments in the short-term experiment and during the first 2 days of the long-term experiment. No differences between treatments were observed in the accumulation of these compounds. After 2 days of exposure, however, the MAA content per cell was several times higher than that initially found in all treatments, and the cells exposed to the PAR + UVR treatment displayed the maximum concentration.

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