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Receptor neuron discrimination of the germacrene D enantiomers in the moth Helicoverpa armigera
KTH, Superseded Departments, Chemistry.
2002 (English)In: Chemical Senses, ISSN 0379-864X, E-ISSN 1464-3553, Vol. 27, no 2, 143-152 p.Article in journal (Refereed) Published
Abstract [en]

Plants release complex mixtures of volatiles, including chiral constituents. In the search for the biologically relevant plant odorants, gas chromatography linked to electrophysiological recordings from single receptor neurons has been employed. In heliothine moths, including the females of the Eurasian cotton bollworm moth Helicoverpa armigera, a major type of receptor neurons is identified, showing high sensitivity and selectivity for the sesquiterpene germacrene D. In the present study, gas chromatography with a chiral column linked to single cell recordings were performed. It was found that all germacrene D neurons belonged to one type; all responded to both enantiomers, but (-)-germacrene D had similar to 10 times stronger effect than (+)-germacrene D. Parallel dose-response curves for the two enantiomers were obtained by direct stimulations. The enantiomeric composition of germacrene D, which differed in six plant species and in different individuals of one species, was determined on the basis of the neuron responses. The results, showing the presence of one neuron type for receiving the information about germacrene D in the various plants, suggests that the two enantiomers mediate the same kind of information to the moth, but with different intensity.

Place, publisher, year, edition, pages
2002. Vol. 27, no 2, 143-152 p.
Keyword [en]
heliothis-virescens, solidago-canadensis, sex-pheromone, gypsy-moth, ips-pini, nun moth, sesquiterpene, identification, (-)-germacrene-d, biosynthesis
URN: urn:nbn:se:kth:diva-21346ISI: 000174037400006OAI: diva2:340044
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Borg-Karlson, Anna-Karin
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