Abstract
Living organisms are constantly exposed to oxidant agents deriving from both endogenous and exogenous sources capable of altering the cellular antioxidant system and inducing damages to biomolecules. Protective systems exist in insects, as in all aerobic organisms, to enable adaptation to oxidative environments. Biochemical parameters evaluated in adult codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), exposed during 24 h at increasing concentrations of chlorantraniliprole insecticide (0; 12.5; 25; 50 and 100 mg L-1) were glutathione S-transferases (GST), catalase (CAT), superoxide dismutase (SOD), reduced glutathione (GSH) and malondialdehyde level (MDA). No mortality was observed; however, a significant lethargy was detected in a dose dependent manner. The 24 h exposure regime to 50 mg x L-1 chlorantraniliprole insecticide -equivalent to field application dose- caused significant decreases in GST and SOD activities (36.4% and 52.5%, respectively) and in MDA level (56.8%) as compared with untreated control. No significant changes were observed in CAT nor GSH activities in codling moths exposed to the insecticide. Decline in antioxidant defense due to chlorantraniliprole would induce oxidative stress in insects
Highlights
Numerosos contaminantes ambientales son importantes fuentes de radicales libres en los sistemas biológicos
Las EROs, principalmente el radical hidroxilo, pueden reaccionar con macromoléculas biológicas y conducir al daño oxidativo de proteínas, lípidos y ADN (Abdollahi et al, 2004; Bonekamp et al, 2009; Sohal & Orr, 2012)
Detectaron una marcada disminución que podría ser A la Dra. Liliana Cichón y al personal de campo el resultado de la transformación de este compuesto del INTA Alto Valle por la provisión de los organismos en diversas biomoléculas, como la lipofuscina, utilizados en este trabajo
Summary
Se evaluó el efecto de la exposición al insecticida clorantraniliprol (0; 12,5; 25; 50 and 100 mg L-1) durante 24 h en adultos de Cydia pomonella (L.) (Lepidoptera: Tortricidae) sobre los biomarcadores antioxidantes glutatión Stransferasa (GST), catalasa (CAT), superóxido dismutasa (SOD), glutatión reducido (GSH) y malondialdehido (MDA). (2015) observaron una disminución significativa en la Un aumento en el nivel de actividad CAT protegería actividad GST de larvas del mosquito Chironomus a los organismos de las EROs producidas durante la riparius Meigen (Diptera: Chironomidae) después de 24 metabolización de prooxidantes y la disminución de la h de exposición a este insecticida.
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