Effect of UV-B radiation on the growth and antioxidant enzymes of Antarctic sea ice microalgae <Emphasis Type="Italic">Chlamydomonas</Emphasis> sp. ICE-L |
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Authors: | Quan-fu Wang Yan-hua Hou Jin-lai Miao Guang-you Li |
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Institution: | (1) School of the Ocean, Harbin Institute of Technology, Weihai, Shandong, 264209, People’s Republic of China;(2) Key Lab of Marine Bioactive Substances, First Institute of Oceanography, State Oceanic, Administration, Qingdao, Shandong, 266061, People’s Republic of China; |
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Abstract: | The effect of ultraviolet-B (UV-B) radiation on Antarctic phytoplankton has become an attractive ecological issue as a result
of annual springtime ozone depletion. The effects of UV-B radiation on the growth and antioxidant enzymes were investigated
using Antarctic sea ice microalgae Chlamydomonas sp. ICE-L as the material in this study. The results demonstrated that UV-B radiation could notably inhibit the growth, especially
at high UV-B radiation intensity (70 μW cm−2). Malondialdehyde and O2
·− content in ICE-L increased rapidly in early days (1–3 days) exposed to UV-B radiation enhancement, then decreased rapidly.
In the stress of UV-B radiation enhancement, the superoxide dismutase, peroxidase and Catalase activities of 1–4 days in ICE-L
were obviously higher than those in the control, and their activities became higher at high UV-B radiation intensity (70 μW cm−2). These enzymes activity of 7 days would kept stable at low UV-B radiation intensity (35 μW cm−2), but kept high level at high UV-B radiation intensity (70 μW cm−2). However, the ascorbate peroxidase activity in ICE-L kept stable under the stress of UV-B radiation enhancement. The above
experimental results indicated that the antioxidant enzyme system played an important role in the adaptation of Antarctic
ice microalgae under the UV-B radiation change of Antarctic ecosystems. |
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