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Effects of elevated CO2 concentration on the activities of detoxifying enzymes and protective enzymes in adults of Frankliniella occidentalis and F. intonsa( Thysanoptera: Thripidae)
Pages: 754-761
Year: Issue:  7
Journal: Acta Entomologica Sinica

Keyword:  Frankliniella occidentalisFrankliniella intonsaCO2 concentrationdetoxifying enzymesprotective enzymesenzyme activity;
Abstract: 【Aim】To clarify the physiological mechanism of the effect of elevated CO2 concentration on invasive insect Frankliniella occidentalis and the local related species F. intonsa. 【Methods 】 The activities of three detoxifying enzymes( caboxylesterase,CarE; acetylcholinesterase,AchE; microsomal mixed-function oxidases,MFO) and three protective enzymes( superoxide dismutase,SOD; catalase,CAT; peroxidase,POD) in F. occidentalis and F. intonsa adults bred under different atmospheric CO2 concentrations( 400 μL /L and 800 μL /L) in CO2 artificial climate chambers were assayed and analyzed.【Results】The activities of CarE,AchE,MFO,CAT and POD in F. occidentalis adults increased as the CO2 concentration rose. The CarE and MFO activities in F. occidentalis adults bred under 800 μL /L CO2 increased by 24. 78% and 16. 05%,respectively,as compared with those bred under 400 μL /L CO2.The activities of CarE,MFO and CAT in F. intonsa adults bred through three successive generations under the high CO2concentration( 800 μL /L) was significantly higher than those bred under the low CO2 concentration( 400 μL /L)( P < 0. 05). The activities of AchE and POD in adults of the two thrips bred under the two CO2 concentrations were not significantly different( P > 0. 05). The SOD activities in F.occidentalis and F. intonsa adults bred under 800 μL /L CO2 were significantly lower than those in adults of both species bred under 400 μL /L CO2( P < 0. 05),decreased by 65. 22% and 42. 20%,respectively. 【Conclusion】Elevated CO2 concentration is the main reason for the increase in activities ofCarE,MFO and SOD,and the changes in activities of AchE,CAT and POD are mainly influenced by thrips species. F. occidentalis and F. intonsa may adapt to the high CO2 concentration environment by altering the activities of detoxifying and protective enzymes.
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