Under ECO2 + AO3, AA was enhanced significantly due to excess
carbohydrate production due to elevated CO2 (Kumari et al., 2013).
However, other antioxidative enzymes were not enhanced,
indicating lower oxidative stress in leaves caused by ambient O3
in presence of elevated CO2. Under ECO2 + EO3, the enhanced
activities of SOD, POX and GR at 30 DAE may be due to increase in
H2O2 content which reduced the APX activity due to scavenging.
The increase in O3 flux under ECO2 + EO3 compared to ACO2 + AO3
may be the reason for enhancement of antioxidative enzyme
activities which balanced the ROS production, resulting in reduced
solute leakage and MDA content. Chlorophyll loss was also lower
under ECO2 + EO3 compared to ACO2 + AO3. These results proved the
hypothesis that elevated CO2 will enhance the antioxidative system
to prevent the action of ROS produced by ambient and elevated O3
Under ECO2 + AO3, AA was enhanced significantly due to excesscarbohydrate production due to elevated CO2 (Kumari et al., 2013).However, other antioxidative enzymes were not enhanced,indicating lower oxidative stress in leaves caused by ambient O3in presence of elevated CO2. Under ECO2 + EO3, the enhancedactivities of SOD, POX and GR at 30 DAE may be due to increase inH2O2 content which reduced the APX activity due to scavenging.The increase in O3 flux under ECO2 + EO3 compared to ACO2 + AO3may be the reason for enhancement of antioxidative enzymeactivities which balanced the ROS production, resulting in reducedsolute leakage and MDA content. Chlorophyll loss was also lowerunder ECO2 + EO3 compared to ACO2 + AO3. These results proved thehypothesis that elevated CO2 will enhance the antioxidative systemto prevent the action of ROS produced by ambient and elevated O3
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