Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
Volume 54, Issue 2-3, Pages 121-125Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S1011-1344(00)00005-1
Keywords
UV-A; UV-B; Daphnia; plankton; oxidative stress; antioxidant enzymes
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The aim of the present study is to evaluate the occurrence of oxidative stress in the cladoceran Daphnia longispina exposed to UV-A and UV-B radiation. The activity of antioxidant enzymes and lipid peroxidation markers is investigated and the protective action of ascorbic acid determined. Results show differences in the lethality radioinduced by UV-A and W-B. Both UV-A and UV-B exposure cause an important increase in malonaldehyde (MDA) concentration and catalase activity. Ascorbic acid addition reduces the MDA concentration, indicating that the oxidative stress caused by either W-A or UV-B radiation can be controlled by antioxidants. The increase of the antioxidant enzymes may be a response mechanism to oxidative stress. (C) 2000 Elsevier Science S.A. All rights reserved.
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