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. 2019 Aug 22;10:1052. doi: 10.3389/fphys.2019.01052

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Copyright © 2019 Jiang, Breer and Pregitzer.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) The schematic phylogenetic tree of locust OR sequences is adapted from Pregitzer et al., 2017. Schistocerca ORs are grouped within 3 distinct monophyletic lineages. Group I was previously named b-ORs, due to its close proximity to the basal Orco root group, marked by a R. A monophyletic group diverging from an inner-node in the phylogenetic tree, supported by a bootstrap value of 85, was classified as group II. The remaining branches, which diverge from another node with a bootstrap value of 59, were assigned as the group III. OR types from each of the three groups are listed in the table. (B) Visualization of olfactory sensory neurons in sensilla basiconica (ba) and sensilla trichodea (tr) in tissue sections from locust antennae using Orco as a marker. The cluster of OSNs is delineated by white dish lines indicating a small group of Orco positive cells in sensilla trichodea and a large cluster of Orco positive cells in sensilla basiconica.