Polar Biology

, Volume 29, Issue 11, pp 988–996

Impact of temperature on UV-susceptibility of two Ulva (Chlorophyta) species from Antarctic and Subantarctic regions

Original Paper

DOI: 10.1007/s00300-006-0141-6

Cite this article as:
Rautenberger, R. & Bischof, K. Polar Biol (2006) 29: 988. doi:10.1007/s00300-006-0141-6

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.

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Institute for Polar EcologyUniversity of KielKielGermany