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Infestation of cowpea aphid ( Aphis craccivora Koch) induced oxidative stress in leaves of soybean ( Glycine max (L.) Merr. cv. “Nam Dan”) with a burst in generati on of reactive oxygen species (ROS) products such as superoxide anion rad ical (O2 ) and hydrogen peroxide (H 2O2) recorded around 24 hours after aphid feeding. A con tinuous increase in content of thiobarbituric acid reactive substances (TBARS) in lipid peroxidat ion and a defined percentage of injury in aphid-infested leaves (2.20 8.79 %) were resulted from the cellular oxidative damage. An enhanced activity of the antioxidant enzymes such a s superoxide dismutase (SOD, EC 1.15.1.1) and catalase (CAT, EC 1.11.1.6) was recorded in lea ves of soybean “Nam Dan” from 24 to 48 hours post-infestation (hpi). The enhancement of th ese enzymes function as the antioxidative response that controlled both ROS-accumulation play ing as defensive element and ROSdetoxifying, therefore, reduce the oxidative damage within 48-96 hpi. Activity of SOD and CAT also can improve the tolerance of soybean “Nam Dan” to infestation from A. craccivora.

ANTIOXIDATIVE DEFENSE RESPONSE TO APHID-INDUCED OXIDATIVE STRESS IN Glycine max (L.) Merr. cv. “Nam Dan”