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Chemical Senses Advance Access originally published online on July 24, 2008
Chemical Senses 2008 33(9):759-769; doi:10.1093/chemse/bjn034
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Functional Characteristics of a Tiny but Specialized Olfactory System: Olfactory Receptor Neurons of Carrot Psyllids (Homoptera: Triozidae)

Lina Kristoffersen1, Mattias C. Larsson2 and Olle Anderbrant1

1 Department of Ecology, Chemical Ecology and Ecotoxicology, Lund University, Sölvegatan 37, SE-223 62 Lund, Sweden 2 Department of Crop Protection Biology, Chemical Ecology, Swedish University of Agricultural Sciences, SE-230 53 Alnarp, Sweden

Correspondence to be sent to: Mattias C. Larsson, Department of Crop Protection Biology, Chemical Ecology, Swedish University of Agricultural Sciences, Box 102, SE-230 53 Alnarp, Sweden. e-mail: mattias.larsson{at}ltj.slu.se


  Abstract

With only ~50 olfactory receptor neurons (ORNs), the carrot psyllid Trioza apicalis (Homoptera: Psylloidea) may have the smallest olfactory system described in adult Neopteran insects. Using single sensillum recordings (SSR) and gas chromatograph–linked SSR, we characterized 4 olfactory sensilla forming a distinct morphological type, which together house ~25% of all ORNs. We recorded responses to extracts and single constituents from Daucus carota ssp. sativus, from the conifers Picea abies, Pinus sylvestris, and Juniperus communis, as well as from male and female T. apicalis. Receptor neurons were highly selective; only 9 compounds in total elicited repeatable responses, and each neuron responded to at most 3 individual compounds. Chemical profiles of carrot and conifers showed significant overlap, with 4 out of 9 electrophysiologically active compounds occurring in more than one type of extract, but a carrot-specific compound elicited the most repeated responses. We identified 4 tentative neuron classes and found a rather high degree of neuronal redundancy, with 1 neuron class present in 3 and another present in all 4 of the sensilla, respectively.

Key words: GC-SSR, host plant, olfaction, sensillum, single sensillum recording, Trioza apicalis

Accepted 5 June 2008


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