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Pakistan Journal of Biological Sciences

Year: 2001 | Volume: 4 | Issue: 9 | Page No.: 1138-1143
DOI: 10.3923/pjbs.2001.1138.1143
Drought and Gibberellic Acid-dependent Oxidative Stress: Effect on Antioxidant Defense System in Two Lettuce Cultivars
Dina Z. Abdel-Kader

Abstract: The purpose of the present work was to evaluate the oxidative stress and the antioxidant defense system in two-lettuce cultivars Lactusa sativa var. longifolia-baladi (baladi cv.) and Lactusa sativa var. crispa-mignonette (mignonette cv.). The plants were subjected to two drought levels and treated with two concentrations of gibberellic acid (GA3). The application of drought stress increased significantly the lipid peroxidation and catalase activity in the two cultivars while it induced significant decreases in protein content, peroxidase and ascorbic acid oxidase activities as compared to control. Treatment with gibberellic acid alleviated the adverse effects of drought. It could be concluded that the lowest concentration of GA3 was more effective on alleviating the adverse effect than the highest concentration. Also it was found that mignonette cultivar was more tolerant to drought than baladi cultivar.

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Dina Z. Abdel-Kader , 2001. Drought and Gibberellic Acid-dependent Oxidative Stress: Effect on Antioxidant Defense System in Two Lettuce Cultivars. Pakistan Journal of Biological Sciences, 4: 1138-1143.

Keywords: gibberellic acid, lipid peroxidation antioxidants and Drought

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