Oxidative stress in herbicide-treated broad bean and maize plants |
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Authors: | Nemat M Hassan Mamdouh M Nemat Alla |
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Institution: | (1) Botany Department, Faculty of Science at Damietta, Mansoura University, Damietta, Egypt |
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Abstract: | Treatments of broad bean and maize seedlings with fluometuron, atrazine or rimsulfuron affected some parameters of oxidative
stress. Fluometuron significantly reduced activity of Hill reaction (PSII), chlorophyll a+b contents and activity of ribulose-1,5-bisphosphate
carboxylase/oxygenase (Rubisco, EC 4.1.1.39) in leaves of both species and significantly increased contents of H2O2, lipid peroxides and carbonyl groups during the whole experiment. There were, moreover, significant inhibitions in activities
of superoxide dismutase (SOD; E.C. 1.15.1.1), catalase (CAT; E.C. 1.11.1.6), ascorbate peroxidase (APX; E.C. 1.11.1.11) and
guaiacol peroxidase (GPX; E.C. 1.11.1.7). Response to atrazine was, to some extent, similar to fluometuron throughout the
entire experiment in broad bean and up mostly to the 12th day of the experiment in maize. The herbicide effect was more pronounced in broad bean than maize. These results point to
indicate an occurrence of oxidative stress in both species by fluometuron and only in broad bean by atrazine. The increase
in H2O2 content accompanied with drop in activities of SOD, CAT and peroxidases indicates a decline in its detoxification rather
than increase in its synthesis. On the contrary, rimsulfuron seemed to have no effect on most of the tested parameters although
there were transient significant increases in H2O2, lipid peroxides and carbonyl groups as well as activities of SOD, CAT, APX and GPX. These findings, based on the recovery
in oxidative stress, indicate that fluometuron is involved in oxidative stress generation in both species but atrazine only
in broad bean while rismulfuron is not in both species. |
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Keywords: | broad bean herbicide maize oxidative stress |
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