Responses of a population of antennal olfactory receptor cells in the female moth Manduca sexta to plant-associated volatile organic compounds

V. D C Shields, John G Hildebrand

Research output: Contribution to journalArticle

106 Citations (Scopus)

Abstract

Extracellular electrophysiological recordings were made from individual type-A trichoid sensilla on the antenna of the female sphinx moth Manduca sexta. A single annulus of the antenna bears about 1,100 of these sensilla, and each is innervated by two olfactory receptor cells. We tested the responses of these receptor cells to a panel of 102 volatile compounds, as well as three plant-derived odor mixtures, and could discern three different functional types of type-A trichoid sensilla. One subset of receptor cells exhibited an apparently narrow molecular receptive range, responding strongly to only one or two terpenoid odorants. The second subset was activated exclusively by aromatics and responded strongly to two to seven odorants. The third subset had a broad molecular receptive range and responded strongly to odorants belonging to several chemical classes. We also found receptor cells that did not respond to any of the odorants tested but were spontaneously active. Certain odorants elicited excitatory responses in some sensilla but inhibitory responses in others, and some receptor cells were strongly excited by certain odorants but inhibited by others. Impregnation of groups of receptor cells in type-A trichoid sensilla with rhodamine-dextran demonstrated that their axons project mainly to the large female glomeruli of the antennal lobe.

Original languageEnglish (US)
Pages (from-to)1135-1151
Number of pages17
JournalJournal of Comparative Physiology A
Volume186
Issue number12
DOIs
StatePublished - 2000

Fingerprint

Olfactory Receptor Neurons
Manduca
Volatile Organic Compounds
olfactory receptors
Moths
volatile organic compounds
Manduca sexta
odor compounds
Sensilla
moth
sensilla
volatile organic compound
moths
antenna
receptors
odor
Population
cells
antennae
antennal lobe

Keywords

  • Antenna
  • Insect
  • Olfaction
  • Olfactory sensilla
  • Trichoid sensilla

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Physiology
  • Physiology (medical)
  • Behavioral Neuroscience
  • Neuroscience(all)

Cite this

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abstract = "Extracellular electrophysiological recordings were made from individual type-A trichoid sensilla on the antenna of the female sphinx moth Manduca sexta. A single annulus of the antenna bears about 1,100 of these sensilla, and each is innervated by two olfactory receptor cells. We tested the responses of these receptor cells to a panel of 102 volatile compounds, as well as three plant-derived odor mixtures, and could discern three different functional types of type-A trichoid sensilla. One subset of receptor cells exhibited an apparently narrow molecular receptive range, responding strongly to only one or two terpenoid odorants. The second subset was activated exclusively by aromatics and responded strongly to two to seven odorants. The third subset had a broad molecular receptive range and responded strongly to odorants belonging to several chemical classes. We also found receptor cells that did not respond to any of the odorants tested but were spontaneously active. Certain odorants elicited excitatory responses in some sensilla but inhibitory responses in others, and some receptor cells were strongly excited by certain odorants but inhibited by others. Impregnation of groups of receptor cells in type-A trichoid sensilla with rhodamine-dextran demonstrated that their axons project mainly to the large female glomeruli of the antennal lobe.",
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AU - Shields, V. D C

AU - Hildebrand, John G

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KW - Trichoid sensilla

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