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(-)-germacrene D receptor neurones in three species of heliothine moths: structure-activity relationships
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2003 (Engelska)Ingår i: Journal of Comparative Physiology A. Sensory, neural, and behavioral physiology, ISSN 0340-7594, E-ISSN 1432-1351, Vol. 189, nr 7, s. 563-577Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Specificity of olfactory receptor neurones plays an important role in food and host preferences of a species, and may have become conserved or changed in the evolution of polyphagy and oligophagy. We have identified a major type of plant odour receptor neurones responding to the sesquiterpene germacrene D in three species of heliothine moths, the polyphagous Heliothis virescens and Helicoverpa armigera and the oligophagous Helicoverpa assulta. The neurones respond with high sensitivity and selectivity to (-)-germacrene D, as demonstrated by screening via gas chromatography with numerous mixtures of plant volatiles. Germacrene D was present in both host and non-host plants, but only in half of the tested species. The specificity of the neurones was similar in the three species, as shown by the 'secondary' responses to a few other sesquiterpenes. The effect of (-)-germacrene D was about ten times stronger than that of the (+)-enantiomer, which again was about ten times stronger than that of (-)-alpha-ylangene. Weaker effects were obtained for (+)-beta-ylangene, (+)-alpha-copaene, beta-copaene and two unidentified sesquiterpenes. The structure-activity relationship shows that the important properties of (-)-germacrene D in activating the neurones are the ten-membered ring system and the three double bonds acting as electron-rich centres, in addition to the direction of the isopropyl-group responsible for the different effects of the germacrene D enantiomers.

Ort, förlag, år, upplaga, sidor
2003. Vol. 189, nr 7, s. 563-577
Nyckelord [en]
GC-SCR, germacrene D, heliothine moths, olfactory receptor neurones, sesquiterpenes, germacrene-d, gas-chromatography, solidago-canadensis, plant odors, virescens, sesquiterpenes, biosynthesis, electrophysiology, identification, enantiomers
Identifikatorer
URN: urn:nbn:se:kth:diva-22710DOI: 10.1007/s00359-003-0434-yISI: 000184504500007PubMedID: 12827423Scopus ID: 2-s2.0-0042475553OAI: oai:DiVA.org:kth-22710DiVA, id: diva2:341408
Anmärkning
QC 20100525Tillgänglig från: 2010-08-10 Skapad: 2010-08-10 Senast uppdaterad: 2020-03-10Bibliografiskt granskad

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Borg-Karlson, Anna-Karin
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Kemi
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Journal of Comparative Physiology A. Sensory, neural, and behavioral physiology

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