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Ultraviolet-B radiation improves astaxanthin accumulation in green microalga Haematococcus pluvialis
Zhengyun Wu1, Guanqun Chen, Siukuen Chong
1Department of Biology and Kwong Living Trust Food Safety & Analysis Laboratory, Hong Kong Baptist University, Kowloon Tong, Hong Kong.
Abstract:
Ultraviolet-B (UV-B) radiation has significantly negative effect on cell survival rate (P < 0.01) and positive effect on astaxanthin accumulation (P < 0.01) of Haematococcus pluvialis. H. pluvialis accumulated 3.2 mg/g of astaxanthin when being exposed to 5 W/m(2) of UV-B for 60 min prior to 72 h of high light treatment, which was 122% higher than that of the control. This UV-B treatment also significantly stimulated lipid peroxidation and the value of malondialdehyde and glutathione peroxidase activities were 156 and 166% higher than those of control, respectively (P < 0.01).
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