Abstract
The importance of plant cuticular waxes in plant–herbivore interactions has become an area of increasing interest, but it has been poorly explored in chrysomelid beetles, one of the most important groups of insect pests. In this study, we investigated the effects of cuticular wax on feeding behaviors of Aulacophora femoralis (Chyrosomelidae), a pest of Cucurbitaceae crops. We analyzed chemical compositions of leaf cuticular waxes using gas chromatography–mass spectrometry. The compositions were significantly different among plant species; in particular, host (Cucumis maxima, C. pepo, C. sativus, Cucurbitaceae) and non-host (Pueraria lobata, Fabaceae) leaves had distinctive compositions of cuticular waxes. We examined if the cuticular wax induces feeding behaviors based on a bioassay using filter papers treated with cuticular wax extract from host or non-host leaves, or a synthetic mixture of straight-chain alkanes (n-alkanes), major components of the host cuticular waxes shared among different host species. We found that the beetles frequently left bite marks on the filter papers treated with n-alkanes but less frequently on those treated with cuticular wax extracts of host leaves. These results indicate that leaf cuticular wax n-alkanes stimulate feeding behavior, but are not cues for host selection.
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Data supporting the findings of this study are available from the corresponding author I.K. on request.
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Acknowledgements
The authors are grateful to Akira Matumoto, Satomi Yoshinami for assisting with growing plants in the experimental field at CER; and Yuka Yahiro, Ayao Hori and Kaori Shiojiri for providing insects for the experiments. This study was financially supported by JSPS KAKENHI, grant nos. 16H04830 and 20H03324.
Funding
This work was supported by JSPS KAKENHI to Shoko Sakai (grant nos. 16H04830, 16K07516 and 20H03324).
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All authors contributed to the study conception and design. Data collection of the cuticular waxes was performed by IK and YI. Feeding experiments were done by IK. The first draft of the manuscript was written by IK and SS. All authors read and approved the final manuscript.
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Communicated by Günther Raspotnig.
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Kamata, I., Inui, Y. & Sakai, S. Straight-chain alkanes derived from leaf waxes stimulate feeding behaviors in a cucurbit leaf beetle, Aulacophora femolaris (Chrysomelidae, Coleoptera). Chemoecology 33, 55–61 (2023). https://doi.org/10.1007/s00049-023-00384-0
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DOI: https://doi.org/10.1007/s00049-023-00384-0