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  • 1
    Electronic Resource
    Electronic Resource
    The role of an epipharyngeal sensillum in the perception of feeding deterrents by Leptinotarsa decemlineata larvae (1998)
    Springer
    Journal of comparative physiology 183 (1998), S. 255-264 
    Details
    ISSN: 1432-1351
    Keywords: Key words Feeding deterrents ; Behaviour ; Electrophysiology ; Epipharyngeal sensillum ; Leptinotarsa decemlineata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract An epipharyngeal taste sensillum in Leptinotarsa decemlineata larvae was studied. Electron microscopy showed that the sensillum is innervated by five neurons. Electrophysiological experiments showed that one of these cells responds to water, a second to sucrose and a third to two feeding deterrents that were also effective in a behavioural test. Receptor cells sensitive to feeding deterrents were not previously reported for L.␣decemlineata larvae or adults. The response of the sucrose-sensitive cell was strongly inhibited by one of the two feeding deterrents and only slightly by the other feeding deterrent. The relationship between the behavioural and electrophysiological results is discussed in order to elucidate the neural code of feeding deterrents in L. decemlineata larvae. We conclude that probably both the response of the deterrent cell and peripheral interactions exerted by feeding deterrents on the sucrose-sensitive cell determine the potency of feeding deterrents. The present results provide a physiological basis for the hypothesis that the presence or absence of feeding deterrents in potential food plants is a decisive cue in food plant selection by L. decemlineata larvae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050253
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  • 2
    Electronic Resource
    Electronic Resource
    Antifeedant and toxic effects of drimanes on Colorado potato beetle larvae (1996)
    Springer
    Entomologia experimentalis et applicata 79 (1996), S. 69-76 
    Details
    ISSN: 1570-7458
    Keywords: antifeedant ; Colorado potato beetle ; drimane ; feeding behaviour ; Leptinotarsa decemlineata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Among the drimane compounds tested, the dialdehydes polygodial and warburganal were the most active as antifeedants against Colorado potato beetle larvae, Leptinotarsa decemlineata Say (Coleoptera: Chrysomelidae), in a dual-choice assay with potato, Solanum tuberosum L., leaf discs. Lactones were less effective. Direct observations showed that decreased feeding on leaf discs treated with polygodial and warburganal was accompanied by increased locomotry activity. Topical application of these two compounds on the insect's cuticle decreased food intake of untreated leaf discs, indicating that besides deterrent effects, toxic properties of these molecules influence feeding behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00333823
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  • 3
    Electronic Resource
    Electronic Resource
    Behavioural and sensory responses to drimane antifeedants in Pieris brassicae larvae (1996)
    Springer
    Entomologia experimentalis et applicata 79 (1996), S. 195-202 
    Details
    ISSN: 1570-7458
    Keywords: antifeedant ; drimane ; feeding behaviour ; sensory response ; structure-activity relationship ; neural code ; Pieris brassicae ; Lepidoptera ; Pieridae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Fifteen drimane compounds were tested for their feeding inhibiting activity in larvae of Pieris brassicae L. (Lepidoptera: Pieridae) when applied to leaf material of the host plant Brassica oleracea L. The antifeedant efficacy of the drimanes was related to their molecular structure in order to identify important functional groups. Of the drimanes tested, those with a lactone group on the B-ring were the most effective feeding inhibitors. Additionally, the sensory responses to 13 of the drimanes were measured. Neural activity was evoked in the deterrent cell in the medial sensillum styloconicum. Also, inhibition of sensory responses to feeding stimulants was found. Results of behavioural and electrophysiological tests were correlated in an attempt to elucidate the sensory code underlying feeding inhibition by drimanes in Pieris brassicae. It was concluded that the response of the deterrent cell in the medial sensillum styloconicum contributes significantly to inhibition of feeding behaviour in larvae of Pieris brassicae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343339
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  • 4
    Electronic Resource
    Electronic Resource
    Behavioural observations of Pieris brassicae larvae indicate multiple mechanisms of action of analogous drimane antifeedants (2000)
    Springer
    Entomologia experimentalis et applicata 95 (2000), S. 217-227 
    Details
    ISSN: 1570-7458
    Keywords: antifeedant ; drimane ; mechanism of action ; sensory response ; toxicity ; habituation ; behavioural observation ; structure-activity relationship ; Pieris brassicae ; Lepidoptera ; Pieridae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We tested 11 analogous synthetic drimane antifeedant compounds for their feeding inhibiting effects on larvae of the large white butterfly Pieris brassicae L. (Lepidoptera: Pieridae) in no-choice tests on the host plant Brassica oleracea L. Furthermore, we observed larval feeding behaviour in no-choice tests to analyze temporal effects of five drimanes. The results show that the five analogous antifeedants differentially influence feeding behaviour and locomotion activity. Warburganal and polygodial are most likely sensory mediated antifeedants. Habituation to these compounds occurs soon after the onset of the tests (i.e., within 0.5–1.5 h). Compound 5 and confertifolin are probably not direct, sensory mediated antifeedants. After 0.5–1.5 h of exposure, these compounds inhibit not only feeding, but also locomotion behaviour, indicating postingestive, toxic effects. Isodrimenin inhibits feeding from the onset of the test and is probably a sensory mediated antifeedant. No habituation occurs to this compound, indicating that isodrimenin is either a very strong antifeedant or that it additionally has postingestive, toxic effects. Topical application of the drimanes on the larval cuticle revealed feeding inhibiting effects, but these could not be related to the occurrence of postingestive feeding inhibiting effects, indicating that this method is inappropriate to show possible postingestive effects of drimanes in P. brassicae. In conclusion, the behavioural observations performed in this research indicate that analogous drimanes inhibit feeding by P. brassicae larvae through multiple mechanisms of action. The results show that, when developing a structure activity relationship (SAR) for a series of antifeedants, it is important to distinguish the mode of action which underlies inhibition of feeding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004064931302
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  • 5
    Electronic Resource
    Electronic Resource
    Behavioral Effects and Sensory Detection of Drimane Deterrents in Myzus persicae and Aphis gossypii Nymphs (1998)
    Springer
    Journal of chemical ecology 24 (1998), S. 1433-1446 
    Details
    ISSN: 1573-1561
    Keywords: Myzus persicae ; Aphis gossypii ; Homoptera ; Aphididae ; behavior ; feeding ; sensory detection ; antennae ; deterrents ; drimanes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Eleven synthetic drimane compounds were tested for their deterrency to nymphs of Myzus persicae (Sulzer) and Aphis gossypii (Glover) (Homoptera: Aphididae). In general, A. gossypii nymphs were less sensitive to the drimanes than M. persicae nymphs. Warburganal (1) and polygodial (2), with a β-dialdehyde configuration and double bond at C7–C8, were highly active as deterrents and/or feeding inhibitors against both species. One of the synthetic compounds (10) showed relatively high activity against A. gossypii, while it was not active at all against M. persicae, indicating that synthetic analogs of natural deterrents can be highly selective feeding deterrents. From 24-hr interval observations and ablation studies, it is concluded that nymphs of both M. persicae and A. gossypii detect polygodial and possibly the other drimanes tested with contact chemosensilla at the tips of their antennae. The ablation studies also showed that in both species no tarsal, labial, or epipharyngeal sensilla are involved in detecting polygodial within 24 hr.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020999430889
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