Journal
CHEMICAL SENSES
Volume 37, Issue 7, Pages 613-629Publisher
OXFORD UNIV PRESS
DOI: 10.1093/chemse/bjs043
Keywords
antennal architecture; Lepidoptera; plant volatiles; single sensillum recordings; spatial variation; tuning
Funding
- Linnaeus initiative grant [217-2006-1750]
- FORMAS (The Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning)
- SLU (Swedish University of Agricultural Sciences)
- Swedish Research Council (VR)
- European Science Foundation
- Higher Education Commission of Pakistan
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Single-cell recordings from olfactory sensory neurons (OSNs), housed in sensilla located at the base and at the tip of the antenna, showed selective responses to plant odors and female sex pheromone in this polyphagous moth. A spatial variation existed in sensitivity: OSNs present on the more proximal segment (P) were more sensitive than those on the more distal segment (D). OSNs of the 2 locations also differed in temporal characteristics: OSNs on P had shorter latency and displayed more phasic responses, whereas those on D had more tonic responses, especially at low stimulus concentrations. The 196 OSNs responding to our 35 monomolecular stimuli in the screening were housed in 32 functional sensillum types: 27 in basiconic, 3 in long-trichoid, 2 in coeloconic, and 3 in auricillic sensilla. The OSNs in basiconic, coeloconic, and auricillic sensilla responded to plant-associated odorants, whereas OSNs in long-trichoid sensilla responded to female-produced sex pheromone components. Short-trichoid sensilla showed spontaneous activity, but no responses to any odorant tested. OSN specificity to plant stimuli ranged from highly specific to broadly tuned, but it did not differ clearly from females in more specialized moths. OSN response diversity is discussed in terms of olfactory coding, behavior, and ecological specialization.
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