Florida Entomologist (2011) 94, 956-963

Fu-Xian Jia, Wei Dou, Fei Hu and Jin-Jun Wang (2011)
Effects of thermal stress on lipid peroxidation and antioxidant enzyme activities of Oriental fruit fly, Bactrocera dorsalis (Diptera: Tephritidae)
Florida Entomologist 94 (4), 956-963
Abstract: A change in temperature may be responsible for a variety of physiological stress responses in organisms, which are often associated with enhanced generation of reactive oxygen species (ROS) leading to oxidative damage. In the present study, the lipid peroxidation (LPO) levels of the oriental fruit fly, Bactrocera dorsalis (Hendel), were measured under thermal stress conditions of the relatively low (-5, -2.5, 0, and 5 °C) or high (35, 37.5, and 40 °C) temperatures. Subsequently, the time-related effect of thermal stress on activity of antioxidant enzymes including catalase (CAT), glutathione-S-transferases (GSTs), peroxidase (POX), superoxide dismutase (SOD), and total antioxidant capacity (T-AOC) were systematically determined. The results showed that LPO levels increased significantly in a time-dependent manner under thermal stress. The activities of CAT, GSTs, and SOD were significantly enhanced and likely provided a defense mechanism against oxidative damage due to the accumulation of ROS. POX and T-AOC levels were not significantly modified. These results suggest that thermal stress induces oxidative stress, and antioxidant enzymes likely play an important role in reducing oxidative damage in B. dorsalis.
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Database assignments for author(s): Jin-Jun Wang

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
molecular biology - genes

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Bactrocera dorsalis		China (south)