Journal
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
Volume 126, Issue -, Pages 64-69Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.pestbp.2015.07.008
Keywords
Spirotetramat; Cytochrome P450 monooxygenases; Resistance; Aphis gossypii
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Funding
- National Natural Science Foundation of China [31101456, 31330064, 31301728]
- China Postdoctoral Science Foundation [2014M550892]
- Talent Foundation of Jilin University [4305050102RF]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry [3C113BK26604]
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A laboratory-selected spirotetramat-resistant strain (SR) of cotton aphid developed 579-fold and 15-fold resistance to spirotetramat in adult aphids and 3rd instar nymphs, respectively, compared with a susceptible strain (SS) [26]. The SR strain developed high-level cross-resistance to alpha-cypermethrin and bifenthrin and very low or no cross-resistance to the other tested insecticides. Synergist piperonyl butoxide (PBO) dramatically increased the toxicity of spirotetramat and alpha-cypermethrin in the resistant strain. RT-qPCR results demonstrated that the transcriptional levels of CYP6A2 increased significantly in the SR strain compared with the SS strain, which was consistent with the transcriptome results [30]. The depletion of CYP6A2 transcripts by RNAi also significantly increased the sensitivity of the resistant aphid to spirotetramat and alpha-cypermethrin. These results indicate the possible involvement of CYP6A2 in spirotetramat resistance and alpha-cypermethrin cross-resistance in the cotton aphid. These together with other cross-resistance results have implications for the successful implementation of resistance management strategies for Aphis gossypii. (C) 2015 Elsevier Inc All rights reserved.
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