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UV-B effects on Antarctic Chlorella sp cells.
M S Estevez1, G Malanga, S Puntarulo
1Physical Chemistry-PRALIB, School of Pharmacy and Biochemistry, University of Buenos Aires, Argentina. susanap@ffyb.uba.ar
Journal of Photochemistry and Photobiology. B, Biology
|November 6, 2001
Summary
Increased UV-B radiation harms Antarctic Chlorella sp growth and antioxidant levels. This study shows UV-B exposure causes oxidative stress by depleting key antioxidants like ascorbate and alpha-tocopherol.
Area of Science:
- * Environmental Science
- * Marine Biology
- * Photobiology
Background:
- * Antarctic algae like Chlorella sp. face environmental stressors, including increased ultraviolet-B (UV-B) radiation.
- * UV-B radiation can impact algal growth and biochemical composition, potentially leading to oxidative stress.
Purpose of the Study:
- * To investigate the effects of UV-B irradiation on the growth and antioxidant status of Antarctic Chlorella sp. cells.
- * To assess the role of UV-B in inducing oxidative stress in these organisms.
Main Methods:
- * Culturing Antarctic Chlorella sp. under controlled conditions with and without UV-B irradiation (30 kJ m(-2)).
- * Measuring specific growth rates.
- * Quantifying levels of ascorbate, ascorbyl radical, alpha-tocopherol, beta-carotene, and total thiols in different growth phases.
Main Results:
- * UV-B significantly decreased the specific growth rate of Chlorella sp. cells.
- * UV-B exposure led to a significant reduction in ascorbate, alpha-tocopherol, beta-carotene, and total thiols.
- * The ratio of ascorbyl radical to ascorbate increased, indicating oxidative stress.
Conclusions:
- * Increased UV-B radiation induces oxidative stress in Antarctic Chlorella sp.
- * Depletion of both lipid-soluble (alpha-tocopherol, beta-carotene) and water-soluble (ascorbate) antioxidants contributes to this oxidative stress.
- * UV-B poses a significant threat to the physiological integrity of Antarctic microalgae.