PJB-2017-877
ANTI OXIDATIVE RESPONSE OF CYPERMETHRIN DEGRADING BACTERIAL ISOLATES FOR CYPERMETHRIN INDUCED OXIDATIVE STRESS
Rehan Naeem
Abstract
Uncontrolled use of cypermethrin leads to an accumulation of pesticide toxicity in the environment that can affect the non-target organisms that are becoming major environmental concern, nowadays. The exposure of microorganisms to pesticides can result in oxidative damage due to an increase in production of reactive oxygen species (ROS). The study has been investigated to analyze the response of the antioxidant system of two bacterial isolates that is tolerant to the pesticide cypermethrin. Soil samples were collected from tobacco fields of Charsadda Khyber Pakhtoonkhwa with history of cypermethrin and other pyrethroid application over extended period of time. Two cypermethrin degrading bacterial isolates were grown for 7 days in the presence of cypermethrin. Lipid peroxidation and antioxidant enzyme activities were evaluated. The overall results indicated that these cypermethrin degrading bacterial isolates possess a mechanism of tolerance, which may include the control of an imbalance in Reactive oxygen species (ROS) versus scavenging and protection of membrane integrity that eventually leads to tolerance. It implies, that cypermethrin degrading bacterial isolates can respond against cypermethrin stress by altering the activities of Reactive oxygen species (ROS) production including superoxide dismutase (SOD), catalase (CAT), peroxide dismutase (POD), and malondialdehyde (MDA), which can be considered as an exciting event that can leads to the possible use of anti oxidative enzymes as a bio indicator for cypermethrin contamination and also for the detection of cypermethrin degradation potential in particular bacteria under oxidative stress.
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