Receptor neurones in three heliothine moths responding to floral nd inducible plant volatiles |
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Authors: | Email author" target="_blank">Marit?StrandenEmail author Tonette?R?stelien Ilme?Liblikas Tor?J?Almaas Anna-Karin?Borg-Karlson Hanna?Mustaparta |
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Institution: | (1) Neuroscience Unit, Department of Biology, Norwegian University of Science and Technology, 7489 Trondheim, Norway;(2) Faculty of Health Studies, Gjøvik University College, 2802 Gjøvik, Norway;(3) Ecological Chemistry, Organic Chemistry, Department of Chemistry, Royal Institute of Technology, 10044 Stockholm, Sweden;(4) Laboratory of Ecochemistry, Estonian Agricultural University, 51005 Tartu, Estonia |
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Abstract: | Summary. Some plant volatiles are produced in response to
herbivory of several insect species, including heliothine
larvae. In the present study of female heliothine moths, four
co-located receptor neurone types were identified, of which
three types responded strongest to the inducible compounds
E--ocimene, E,E--farnesene and E,E-TMTT, respectively.
The fourth type responded strongest to geraniol,
which is a common floral volatile. The narrow tuning of
each receptor neurone type was demonstrated by responses
to a few structurally-related monoterpenes, sesquiterpenes,
homo-terpenes and monoterpene alcohols, respectively, out
of hundreds of plant constituents tested. The four neurone
types showed the same relation of spike amplitudes and
ranking of effective compounds in the three heliothine
species; the polyphagous Heliothis virescens and
Helicoverpa armigera and the oligophagous Helicoverpa
assulta. The results indicate the presence of functionally
similar types of plant odour-receptor neurones in the three
related species, and suggest conservation or reappearance of
functionally similar olfactory receptors in related species,
independent of the evolution of polyphagy and oligophagy. |
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Keywords: | induced plant volatiles GC-SCR olfactory receptor neurones heliothine terpenoids |
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