ISSN:
1573-1561
Keywords:
Seven-spot ladybird
;
Coccinella septempunctata
;
Coleoptera
;
Coccinellidae
;
electrophysiology
;
single neuron recording
;
dose-response
;
behavior
;
olfactometer
;
aphid alarm pheromone
;
(E)-β-farnesene
;
(−)-β-caryophyllene
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Chemistry and Pharmacology
Notes:
Abstract Electrophysiological responses of adult seven-spot ladybirds, Coccinella septempunctata, to (E)-β-farnesene, an aphid alarm pheromone, and (−)-β-caryophyllene, a plant-derived alarm pheromone inhibitor, were investigated by recording from single olfactory cells (neurons) on the antenna. Cells having high specificity for each of the two compounds were identified. Furthermore, these two cell types were frequently found in close proximity, with a larger amplitude consistently recorded for the cell responding specifically to (E)-β-farnesene. Preliminary behavioral studies in a two-way olfactometer showed that walking adults were significantly attracted to (E)-β-farnesene; this activity was inhibited with increasing proportions of (−)-β-caryophyllene. The possible ecological significance of colocation or pairing of olfactory cells for semiochemicals with different behavioral roles is discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1005555300476
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