Tarsal contact chemoreceptors of the black swallowtail butterfly Papilio polyxenes: responses to phytochemicals from host- and non-host plants |
| |
Authors: | PETER ROESSINGH ERICH STÄDLER RETO SCHÖNI PAUL FEENY† |
| |
Institution: | Eidg. Forschungsanstalt Wädenswil, Wädenswil, Switzerland;*Hoffmann- La Roche &Co AG., Basel, Switzerland;†Section of Ecology and Systematics, Corson Hall, Cornell University, Ithaca, New York, U.S.A. |
| |
Abstract: | Abstract Tarsal contact chemoreceptors of the black swallowtail butterfly Papilio polyxenes (Lepidoptera: Papilionidae) were stimulated with leaf-surface extracts and ethanolic extracts of whole leaves of a host-plant (Daucus carota) and a non-host (Brassica oleracea). Both leaf extracts evoked large numbers of spikes but stimulated different receptor neurones. It is concluded that a large difference exists between the sensory responses to host and non-host extracts. Two chemicals, luteolin 7-0-(6"-0-malonyl)-β-D-glucopyranoside and trans- chlorogenic acid, known to be present in the host and known oviposi-tion stimulants for P.polyxenes , were also tested and shown to be active. No responses were found to luteolin 7-O-β-D-glucoside or to luteolin 7-O-β-D-glucuronide. These flavonoids occur in D.carota foliage, but do not stimulate oviposition. |
| |
Keywords: | Papilio polyxenes black swallowtail electrophysiology contact chemoreception tarsal sensilla oviposition stimulants luteolin 7-0-(6"-0-malonyl)-β-D-glucopyranoside trans-chlorogenic acid Daucus carota Brassica oleracea sensory codes |
|
|