Chem. Senses 27: 143-152,
2002
© Oxford University Press 2002
Receptor Neuron Discrimination of the Germacrene D Enantiomers in the Moth Helicoverpa armigera
Department of Zoology, Norwegian University of Science and Technology, Trondheim, Norway 1 Department of Chemistry, Organic Chemistry, Ecological Chemistry Group, The Royal Institute of Technology, Stockholm, Sweden
Correspondence to be sent to: Hanna Mustaparta, Department of Zoology, Norwegian University of Science and Technology, N-7489 Trondheim, Norway. e-mail: Hanna.Mustaparta{at}chembio.ntnu.no
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 
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.
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