摘要
We made separate experiments to examine life-history traits and activities of protective enzymes as affected by carbon dioxide(CO_(2))elevation to 780μL/L as compared to 390μL/L in imidacloprid-or buprofezin-resistant strains of the brown planthopper(BPH)Nilaparvata lugens.We found an interaction effect between resistance and the CO_(2) level on the nymphal survival and duration in both resistant strains.Nymphal durations in both resistant strains were much shorter in the resistant than susceptible BPH at 780μL/L but similar between them or slightly shorter in the resistant than susceptible BPH at 390μL/L.Nymphal survival was lower for imidacloprid-resistant than its susceptible BPH at 390μL/L but higher at 780μL/L;it stayed unaffected by the CO_(2) elevation in buprofezin-resistant BPH.We did not observe an interaction effect between resistance and the CO_(2) level on major reproductive parameters in both resistant strains.But the 2 strains were not consistent across CO_(2) levels in all parameters.Our measurements of protective enzyme activities of superoxide dismutase,catalase,and peroxidase showed an interaction between resistance and the CO_(2) level.Overall,these enzymes became similar in activity between resistant and susceptible BPH at 780μL/L compared to 390μL/L and the change was more distinct in the imidacloprid-than buprofezin-resistant BPH strains.Our findings suggest that CO_(2) elevation can affect life-history traits of insecticide-resistant BPH,while the effect may vary depending on the kind of insecticides it is resistant to.
基金
part of R&D projects funded by the Ministry of Science&Technology of PR China(200903003,20110303,2012BAC19B01).
