Cadmium mitigates ultraviolet-B stress in Anabaena doliolum: Enzymatic and non-enzymatic antioxidants
2007
Bhargava, P.,Banaras Hindu Univ., Varanasi (India). Lab. of Algal Biology | Atri, N.,Banaras Hindu Univ., Varanasi (India). Lab. of Algal Biology | Srivastava, A.K.,Banaras Hindu Univ., Varanasi (India). Lab. of Algal Biology | Rai, L.C.,Banaras Hindu Univ., Varanasi (India). Lab. of Algal Biology
Impact of ultraviolet-B (UV-B) and Cd, applied individually and in combination, measured in terms of oxygen-evolution, chlorophyll and protein contents, lipid peroxidation, and enzymatic and non-enzymatic antioxidants of Anabaena doliolum, revealed a greater oxidative damage induced by UV-B than by Cd. While superoxide dismutase showed a greater stimulation by UV-B than by Cd, the activities of catalase (CAT) and glutathione reductase (GR) declined after UV-B treatment. Cd treatment, however, enhanced the activities of ascorbate peroxidase and GR. CAT activity increased at low but decreased at high dose of Cd. Increase in carotenoid content in UV-B treated cells suggested a shielding effect of Car against UV-B stress. A 15- and 10-fold rise in alpha-tocopherol content at high dose of Cd and/or UV-B offered testimony to the antioxidant role of alpha-tocopherol.
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