Investigation of Climate Changes on Metabolic Response of Plants: Interactive Effects of Drought Stress and Excess UV-B
Received Date: Sep 26, 2012 / Accepted Date: Dec 12, 2012 / Published Date: Dec 15, 2012
Abstract
Physiological and biochemical responses of bean (Vicia faba L.) plants to either supplementary ultraviolet (sUV-B) radiation, and/or water (WS) stress were investigated. Both stresses caused significant increases in H2O2 content and lipid peroxidation, indicating oxidative damage. Furthermore, increases in activities of stress markers indicated that sUV-B has a stronger stress effect than WS, and it caused greater membrane damage, as assessed by lipid peroxidation and osmolyte leakage.
The activities of ascorbate peroxidase (APX) and superoxide dismutase (SOD) were increased under both stresses when applied alone and in combination, while catalase (CAT) activity decreased under water stress as compared to the control. The combination of drought and UV-B, were more than additive, caused more severe damage than stress factors applied separately.
WS induced accumulation of UV-B absorbing secondary pigments (anthocyanin and flavonoids) which is likely to offer some protection from UV-B irradiation.
Keywords: sUV-B radiation; Water stress; Stress markers; Antioxidant enzymes; Proline accumulation; Secondary metabolites
Citation: Hassan IA, Basahi JM, Haiba NS, Kadi MW (2013) Investigation of Climate Changes on Metabolic Response of Plants; Interactive Effects of Drought Stress and Excess UV-B. J Earth Sci Climate Change 4: 129. Doi: 10.4172/2157-7617.1000129
Copyright: ©2013 Hassan IA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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