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Plant terpenes affect intensity and temporal parameters of pheromone detection in a moth. | LitMetric

Plant terpenes affect intensity and temporal parameters of pheromone detection in a moth.

Chem Senses

Unité Mixte de Recherche 1272 Physiologie de l'Insecte, Signalisation et Communication, Institut National de Recherche Agronomique, Université Pierre et Marie Curie, Route de Saint-Cyr, 78000 Versailles Cedex, France.

Published: November 2009

AI Article Synopsis

  • In moths, male antennae detect female pheromones through specific olfactory receptors (Ph-ORNs), but interactions with plant volatiles can influence this detection.
  • The study examined how certain plant compounds, like linalool and geraniol, affected the male response to the main pheromone component, revealing that plant odors can alter the intensity and timing of pheromone signals.
  • Findings suggest that these interactions might enhance the ability of male moths to locate females in environments with high pheromone levels, indicating a complex relationship between pheromones and plant scents.

Article Abstract

In moths, the components of the female pheromone blend are detected in the male antennae by pheromone olfactory receptor neurons (Ph-ORNs) expressing narrowly tuned olfactory receptors. Responses to sex pheromones have generally been thought to be independent from the odorant background. However, interactions between pheromone components and plant volatiles have been reported at behavioral and detection levels. To document the mechanisms of such interactions, we analyzed Ph-ORN responses of Spodoptera littoralis to the main pheromone component, Z9E11-14:Ac, in the presence of 4 monoterpenes. To mimic natural contexts in which plant odors and pheromone emanate from different sources, the 2 stimuli were presented with different temporal patterns and from independent sources. Linalool reversibly reduced the firing response to Z9E11-14:Ac and produced an off effect. Geraniol and geranyl and linalyl acetates reduced the responses to Z9E11-14:Ac with a longer time course. Pulses of linalool over prolonged pheromone stimulation resulted in a discontinuous firing activity. Pulses of pheromone were better separated over a background of linalool, compared with odorless air. The data confirm that plant compounds may modulate the intensity and the temporal coding by Ph-ORNs of pheromone information. This modulation might positively affect mate location at high pheromone density especially nearby a pheromone source.

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Source
http://dx.doi.org/10.1093/chemse/bjp060DOI Listing

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