Journal of Chemical Ecology

, Volume 35, Issue 4, pp 405–415 | Cite as

Altered Olfactory Receptor Neuron Responsiveness Is Correlated with a Shift in Behavioral Response in an Evolved Colony of the Cabbage Looper Moth, Trichoplusia ni

  • Michael J. Domingue
  • Kenneth F. Haynes
  • Julie L. Todd
  • Thomas C. Baker


There is little understanding of how sex pheromone blends might change during speciation events. For the cabbage looper, Trichoplusia ni, there is a mutant laboratory strain that has exhibited characteristics of a shift to a new pheromone blend. Mutant females produce a blend that is significantly different from wild-type females in having a much higher proportion of a minor pheromone component and lower quantity of the major component. Males in this colony have changed over the years to become more broadly tuned and fly upwind equally well to both the wild-type and mutant female pheromone blends. They also exhibit reduced overall sensitivity to pheromone, flying upwind to either blend at a lower success rate than is typical when wild-type males respond to the wild-type blend. Using single-cell recordings, we examined the olfactory receptor neurons (ORNs) of males from evolved and wild-type colonies for evidence of changes in response characteristics that might explain the above-described behavioral evolution. We found that in evolved-colony males the ORNs tuned to the major sex pheromone component exhibited a somewhat lower responsiveness to that compound than the ORNs of wild-type males. In addition, the minor pheromone component, emitted at excessively high rates by mutant females, elicited a drastically reduced ORN responsiveness in evolved-colony males compared to wild-type males. This alteration in ORN responsiveness may be responsible for allowing evolved males to tolerate the excessive amounts of the minor pheromone component in the mutant female blend, which would normally antagonize the upwind flight of unevolved males. Thus, peripheral olfactory alterations have occurred in T. ni males that are correlated with the evolution of the more broadly tuned, but less sensitive, behavioral response profile.


Lepidoptera Electrophysiology Pheromone Evolution Behavior Olfaction Antenna 



Andy Myrick of Penn State University assisted in the statistical calculations. Bonnie Chastain and Shelby Stamper of the University of Kentucky maintained insect colonies.


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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Michael J. Domingue
    • 1
    • 3
  • Kenneth F. Haynes
    • 2
  • Julie L. Todd
    • 1
  • Thomas C. Baker
    • 1
  1. 1.Center for Chemical Ecology, Department of EntomologyPenn State UniversityUniversity ParkUSA
  2. 2.Department of EntomologyUniversity of KentuckyLexingtonUSA
  3. 3.USDA-ARS, Plant Sciences InstituteBeltsville Area Research CenterBeltsvilleUSA

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