Authors: Guo Lin Wu Jing Cui Ling Tao Hong Yang
Publish Date: 2009/07/31
Volume: 19, Issue: 1, Pages: 124-
Abstract
The present study has evaluated effect of fluroxypyr concentrations 0–08 mg l−1 a widelyused herbicide for controlling annual or perennial weeds growth on selected metabolic and stressrelated parameters in Oryza sativa plants after 6 days of exposure Increasing concentrations decreased shoot growth and accumulation of chlorophylls but had no effect on root biomass Increasing doses led also to increase in superoxide radical hydrogen peroxide and proline accumulation while malondialdehyde an indicator of lipid peroxidation was constitutively elevated Histochemical staining with nitroblue tetrazolium and 3 3diaminobenzidine were positively correlated with the generation of superoxide radical and H2O2 The fluroxypyrinduced oxidative stress triggered significant changes in activities of superoxide dismutase catalase ascorbate peroxidase and peroxidase POD Activities of the antioxidant enzymes show a general increase at low fluroxypyr concentrations and a decrease at high fluroxypyr levels except for POD Analysis of naturing polyacrylamide gel electrophoresis confirmed these results These data support the observation that fluroxypyrtriggered oxidative stress was responsible for the disturbance of the growth in the rice plants
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