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Antioxidant enzymes responses to cadmium in radish tissues.

Vitória, Angela P. and Lea, Peter John and Azevedo, Ricardo Antunes (2001) Antioxidant enzymes responses to cadmium in radish tissues. Phytochemistry, 57 (5). pp. 701-710. ISSN 0031-9422

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Abstract

To investigate the antioxidant responses of radish (Raphanus sativus L.) to cadmium (Cd) treatment, seedlings of a tolerant variety were grown in increasing concentrations of CdCl2, ranging from 0.25–1 mM, for up to 72 h in a hydroponic system. Analysis of Cd uptake indicated that most of the Cd accumulated in the roots, but some was also translocated and accumulated in the leaves, especially at the higher concentrations of Cd used in the experiments. Roots and leaves were analysed for catalase, glutathione reductase and superoxide dismutase activities. Catalase and glutathione reductase activities increased considerably in the roots and leaves after 24 h exposure to the metal, indicating a direct correlation with Cd accumulation. The analysis of native PAGE enzyme activity staining, revealed several superoxide dismutase isoenzymes in leaves, with the two predominant isoenzymes exhibiting increases in activity in response to Cd treatment. The results suggest that in radish, the activity of antioxidant enzymes responds to Cd treatment. The main response may be via the activation of the ascorbate–glutathione cycle for the removal of hydrogen peroxide, or to ensure the availability of glutathione for the synthesis of Cd-binding proteins.

Item Type: Article
Journal or Publication Title: Phytochemistry
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 10811
Deposited By: Mr Richard Ingham
Deposited On: 24 Jul 2008 13:48
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 20:19
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/10811

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