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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., more

Also published as
  • 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, more

Available in Authors 
    VLIZ: Proceedings [129949]

Keywords
    Acclimation; Amino acids; Diatoms; Growth; Inhibitors; Solar radiation; Thalassiosira Cleve, 1873 [WoRMS]; PSW, Antarctica, South Shetland I., King George I., Potter Cove [Marine Regions]; Marine

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

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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