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Chemosensory system is vitally important for animals to select food. Antifeedants that herbivores encounter can interfere with feeding behavior and exert physiological effects. Few studies have assessed the molecular mechanisms underlying the chemoreception of antifeedants. In this study, we demonstrated that a chemosensory protein (CSP) in Locusta migratoria is involved in detecting an antifeedant. This CSP, Lmig EST6 (GenBank Acc. No. AJ973420), we named as Lmig CSPIII, expressed in sensory organs where chemosensilla are widely distributed. Fluorescent binding experiments indicated that Lmig CSPIII exhibits high binding affinity to α-amylcinnamaldehyde (AMCAL), a natural compound from non-host plant. This compound was subsequently demonstrated to be an effective antifeedant to locusts in feeding bioassay. By injection of double-stranded RNA (dsRNA) of Lmig CSPIII, we generated Lmig CSPIII knockdown locusts. The feeding behaviour assays demonstrated that the Lmig CSPIII knockdown locusts had reduced sensitivity to the antifeedant but showed no changes in their physiological development or food consumption. Therefore, we inferred that this chemosensory protein is involved in antifeedant detection.

A Chemosensory Protein Detects Antifeedant in Locust (Locusta migratoria)