Abstract
The interactive effects of UV-B-exposure and increased temperature were investigated in the two green macroalgae Ulva bulbosa from Antarctica and Ulva clathrata from southern Chile in the laboratory. At seawater temperatures of 0°C, UV-induced inhibition of photosynthesis was much larger in U. clathrata than in U. bulbosa, whereas temperatures of 10°C compensated UV-effects in both species. Despite pronounced photoinhibition, damage to D1 protein in photosystem II could not be detected, indicating that photosynthetic reaction centers were unaffected by experimental UV-exposure. In addition, marked differences in the generation of oxidative stress were not detected. Under all treatments, the activity of superoxide dismutase was higher in U. bulbosa than in U. clathrata, indicating a higher degree of cold adaptation in U. bulbosa from Antarctica, resulting in a higher UV-tolerance at 0°C than in U. clathrata from southern Chile.
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Acknowledgements
Authors are grateful to the Alfred Wegener Institute for Polar and Marine Research (Bremerhaven, Germany) for providing cultures of Ulva species and to A. Schneider for protein and MDA analysis. Funding of this study by the “Deutsche Forschungsgemeinschaft” (BI 772/2-1) and the “Helmholtz-Gemeinschaft deutscher Forschungszentren” (VH-NG-059) is gratefully acknowledged.
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Rautenberger, R., Bischof, K. Impact of temperature on UV-susceptibility of two Ulva (Chlorophyta) species from Antarctic and Subantarctic regions. Polar Biol 29, 988–996 (2006). https://doi.org/10.1007/s00300-006-0141-6
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DOI: https://doi.org/10.1007/s00300-006-0141-6