The pheromone system of heliothine moths is an optimal model for studying principles underlying higher-order olfactory processing. In Helicoverpa armigera, three male-specific glomeruli receive input about three female-produced signals, the primary pheromone component, serving as an attractant, and two minor constituents, serving a dual function, i.e. attraction versus inhibition of attraction. From the antennal-lobe glomeruli, the information is conveyed to higher olfactory centers, including the lateral protocerebrum, via three main paths – of which the medial tract is the most prominent. In this study, we traced physiologically identified medial-tract projection neurons from each of the three male‑specific glomeruli with the aim of mapping their terminal branches in the lateral protocerebrum. Our data suggest that the neurons’ wide-spread projections are organized according to behavioral significance, including a spatial separation of signals representing attraction versus inhibition – however, with a unique capacity of switching behavioral consequence based on the amount of the minor components.
All data generated or analysed during this study are included in the manuscript and supporting files.
MGC_PNsInsect Brain Database.
Data from: A Novel Major Output Target for Pheromone-Sensitive Projection Neurons in Male Mothswww.insectbrain.org; https://hdl.handle.net/20.500.12158/SIN-0000020.2.
- Bente G Berg
- GuiRong Wang
- XinCheng Zhao
The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.
Animal experimentation: According to Norwegian law of animal welfare, there are no restrictions regarding experimental use of Lepidoptera.
- Christopher J Potter, Johns Hopkins University School of Medicine, United States
© 2021, Kymre et al.
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