Cadmium mitigates ultraviolet-B stress in Anabaena doliolum: Enzymatic and non-enzymatic antioxidants |
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Authors: | P Bhargava N Atri A K Srivastava L C Rai |
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Institution: | (1) Laboratory of Algal Biology, Center of Advanced Study in Botany, Banaras Hindu University, Varanasi, 221005, India |
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Abstract: | Impact of ultraviolet-B (UV-B) and Cd, applied individually and in combination, measured in terms of oxygen-evolution, chlorophyll
(Chl) 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 (SOD) showed a greater stimulation
by UV-B than Cd, the activities of catalase (CAT) and glutathione reductase (GR) declined after UV-B treatment. Cd treatment,
however, enhanced the activities of ascorbate peroxidase (APX) and GR. CAT activity increased at low but decreased at high
dose of Cd. Increase in carotenoid (Car) content in UV-B treated cells suggested a shielding effect of Car against UV-B stress.
A 15-and 10-fold rise in α-tocopherol (α-TOC) content at high dose of Cd and/or UV-B offered testimony to the antioxidant
role of α-TOC. |
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Keywords: | α -tocopherol ascorbate antioxidative defence system carotenoids chlorophyll oxidative damage |
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