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- Title
Gustatory Sensing Mechanism Coding for Multiple Oviposition Stimulants in the Swallowtail Butterfly, Papilio Xuthus.
- Authors
Ryuda, Masasuke; Calas-List, Delphine; Yamada, Ayumi; Marion-Poll, Frédéric; Yoshikawa, Hiroshi; Tanimura, Teiichi; Ozaki, Katsuhisa
- Abstract
The swallowtail butterfly, Papilio xuthus, selectively uses a limited number of plants in the Rutaceae family. The butterfly detects oviposition stimulants in leaves through foreleg chemosensilla and requires a specific combination of multiple oviposition stimulants to lay eggs on the leaf of its host plants. In this study, we sought to elucidate the mechanism underlying the regulation of oviposition behavior by multiple oviposition stimulants. We classified chemosensilla on the tarsomere of the foreleg into three types (LI, L2, and S) according to their size and response to oviposition stimulants and general tastants. The LI was more abundant in females than in males and responded preferentially to oviposition stimulants. Both L2 and S were common to both sexes and responded to general tastants. We found that five oviposition stimulants (synephrine, stachydrine, 5-hydroxy-Nw-methyltryptamine, narirutin, and c/zfro-inositol) elicited spikes from three specific gustatory receptor neurons (GRNs) within LI sensilla. These three GRNs responded to a mixture of the five stimulants at concentrations equivalent to those found in the whole-leaf extract of citrus, and the mixture induced oviposition at levels comparable to whole-leaf extract. We propose that oviposition is triggered by the firing of three specific GRNs in LI sensilla that encode the chemical signatures of multiple oviposition stimulants.
- Subjects
PAPILIONIDAE; OVIPARITY in insects; RUTACEAE; STIMULANTS; HOST plants; NEURONS
- Publication
Journal of Neuroscience, 2013, Vol 33, Issue 3, p914
- ISSN
0270-6474
- Publication type
Article
- DOI
10.1523/JNEUROSCI.1405-12.2013