Cadmium-induced changes in antioxidant enzymes from the marine alga Nannochloropsis oculata

Cadmium-induced oxidative stress symptoms such as lipid peroxidation and H sub(2)O sub(2) production were examined in the marine alga Nannochloropsis oculata. Changes in antioxidant enzyme levels and isozyme patterns were also examined. Increasing concentrations of Cd produced growth inhibition. Amo...

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Bibliographic Details
Published in:Journal of applied phycology 2003, Vol.15 (1), p.13-19
Main Authors: Lee, MY, Shin, H-W
Format: Article
Language:English
Subjects:
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
glutathione reductase
Metabolism
Metabolism. Physicochemical requirements
Nannochloropsis oculata
Plant physiology and development
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Summary:Cadmium-induced oxidative stress symptoms such as lipid peroxidation and H sub(2)O sub(2) production were examined in the marine alga Nannochloropsis oculata. Changes in antioxidant enzyme levels and isozyme patterns were also examined. Increasing concentrations of Cd produced growth inhibition. Among the responses to added Cd, the H sub(2)O sub(2) content and malonyldialdehyde accumulation increased significantly, indicating a state of oxidative stress. In the case of ascorbate peroxidase activity the increase was about 2.5 times and a marked induction of the isozyme APX2 contributed to this increase. Guaiacol peroxidase activity increased about 4-fold, this being due mainly to the isozyme GPX3. Catalase activity increased slightly, whereas superoxide dismutase and glutathione reductase activity decreased markedly. Alterations of antioxidant enzyme levels and isozyme pattern changes in Cd-treated alga suggest that they might be involved in the heavy metal tolerance in this alga.
ISSN:0921-8971
1573-5176
DOI:10.1023/A:1022903602365