Biologia plantarum 46:289-294, 2003 | DOI: 10.1023/A:1022871131698
Heavy Metals Induce Lipid Peroxidation and Affect Antioxidants in Wheat Leaves
- 1 Plant Biochemistry Laboratory, School of Life Sciences, Assam (Central) University, Silchar-, India
The possible role of Zn and Cr as catalytic inducers of free radicals in wheat leaves was investigated. Treatment of excess heavy metals decreased the chlorophyll and carotenoid content in wheat leaves with the increase in time of excision. A sharp increase in proline accumulation was marked with the increase in metal concentration. Total peroxide content and lipid peroxidation measured as malondialdehyde content showed uniform increase under metal treatment in excised leaves. At almost all concentrations, catalase, guaiacol peroxidase and superoxide dismutase activities decreased with a minor increase in the earlier days of excision. Though glutathione content decreased ascorbate content showed significant increase in wheat leaves under heavy metal treatment.
Keywords: catalase; chromium; guaiacol peroxidase; superoxide dismutase; Triticum aestivum; zinc
Subjects: amino acids; ascorbate, ascorbic acid; carotenoids, lipid peroxidation, antioxidants; catalase; chlorophyll, lipid peroxidation, antioxidants; chromium, lipid peroxidation, antioxidants; glutathione; guaiacol peroxidase; heavy metals; malondialdehyde; proline, lipid peroxidation, antioxidants; superoxide dismutase; Triticum aestivum; wheat, lipid peroxidation, antioxidants; zinc, lipid peroxidation, antioxidants
Prepublished online: March 1, 2003; Published: September 1, 2003 Show citation
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