Abstract
Insects have evolved many physiological and behavioral adaptations to recognize external complex chemicals. Olfaction plays an important role in perceiving volatile chemicals, utilizing them to locate host sites, conspecifics, and enemies. Chemosensory proteins (CSPs) are present in high concentrations within the sensory sensilla of insects and are endowed with a heterogeneous range of functions. However, direct evidence for the involvement of CSPs in olfactory function is still lacking. In this study, a fluorescence-based ligand binding assay using Bdor-CSP2 illustrated its ability to bind the majority of the selected ligands of different shapes and chemical structures that are ecologically significant, host plant volatiles of Bactrocera dorsalis. RNAi-mediated silencing coupled with electrophysiological tests showed lower electrophysiological responses to (3Z)-hex-3-en-1-ol, trans-2-hexenal, 6-methylhept-5-en-2-one, and 3-methylbutyl acetate in dsBdor CSP2 treated flies compared with the untreated controls. The reduced expression of Bdor-CSP2 by RNA interference was confirmed by semi-quantitative PCR, real-time quantitative PCR and Western blot, which suggested the RNAi-treatment was responsible for the observed reduction of antennal responses in EAG recordings. These data suggest that the expression of Bdor-CSP2 is necessary for the recognition of antennal responses to some plant host volatiles by B. dorsalis.
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Acknowledgments
The work was supported by the National Natural Science Foundation of China for grant no. 31071713, and the China Postdoctoral Science Foundation (2013M542185). We thank Dr XiaoLin Dong for reviewing and providing useful comments regarding this manuscript.
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This article has been retracted by Xin Yi, PeiDan Wang, Zheng Wang, Jun Cai, MeiYing Hu, and GuoHua Zhong. Reason: The authors have discovered a serious mistake in the paper. 3-Methylbutyl acetate was reported as binding to the protein. Upon further experimentation, it did not bind. The reason is unclear. After a reevaluation of this work, they no longer have confidence in the finding. Further validation is needed before a firm conclusion can be reached. The authors do not want to further mislead readers of this article.
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Yi, X., Wang, P., Wang, Z. et al. RETRACTED ARTICLE: Involvement of a Specific Chemosensory Protein from Bactrocera dorsalis in Perceiving Host Plant Volatiles. J Chem Ecol 40, 267–275 (2014). https://doi.org/10.1007/s10886-014-0406-4
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DOI: https://doi.org/10.1007/s10886-014-0406-4