Abstract
The ability to sense and recognize various classes of compounds is of particular importance for survival and reproduction of insects. Ionotropic receptor (IR), a sub-family of the ionotropic glutamate receptor family, has been identified as one of crucial chemoreceptor super-families, which mediates the sensing of odors and/or tastants, and serves as non-chemosensory functions. Yet, little is known about IR characteristics, evolution, and functions in Lepidoptera. Here, we identify the IR gene repertoire from a destructive polyphagous pest, Spodoptera litura. The exhaustive analyses with genome and transcriptome data lead to the identification of 45 IR genes, comprising 17 antennal IRs (A-IRs), 8 Lepidoptera-specific IRs (LS-IRs), and 20 divergent IRs (D-IRs). Phylogenetic analysis reveals that S. litura A-IRs generally retain a strict single copy within each orthologous group, and two lineage expansions are observed in the D-IR sub-family including IR100d-h and 100i-o, likely attributed to gene duplications. Results of gene structure analysis classify the SlitIRs into four types: I (intronless), II (1–3 introns), III (5–9 introns), and IV (10–18 introns). Extensive expression profiles demonstrate that the majority of SlitIRs (28/43) are enriched in adult antennae, and some are detected in gustatory-associated tissues like proboscises and legs as well as non-chemosensory organs like abdomens and reproductive tissues of both sexes. These results indicate that SlitIRs have diverse functional roles in olfaction, taste, and reproduction. Together, our study has complemented the information on chemoreceptor genes in S. litura, and meanwhile allows for target experiments to identify potential IR candidates for the control of this pest.
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We thank Miss Mei-Yan Zheng (College of Plant Protection, Nanjing Agricultural University) for providing S. litura pupae.
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This work was supported by the National Natural Science Foundation of China (31601647).
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Zhu, JY., Xu, ZW., Zhang, XM. et al. Genome-based identification and analysis of ionotropic receptors in Spodoptera litura. Sci Nat 105, 38 (2018). https://doi.org/10.1007/s00114-018-1563-z
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DOI: https://doi.org/10.1007/s00114-018-1563-z