Comparison of Sensory Structures Present on Larval Antennae and Mouthparts of Lepidopteran Crop Pests

Rana, Seema; Mohankumar, S.

doi:10.1653/024.100.0217

“…While some previous data from D. melanogaster support a likely role of Painless in taste (Xu et al, 2008), no data are available for supporting the involvement of an OR in taste. However, previous data from the morphological, electrophysiological, and behavioral investigation on moths, among Noctuidae, Cambridae, Plutellidae, Pyralidae, and Yponomeutidae families, underlined the flexibility of the chemosensory systems associated with larval maxilla of Lepidoptera (Roessingh et al, 2007;Rana and Mohankumar, 2017). For example, in Lymantria dispar, a remarkable influence of maxillary palps in facilitating feeding by the organization of a complex neurosensory mechanism composed by gustatory sensilla together with the olfactory ones has been proposed (Solari et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

Chemosensory Receptors in the Larval Maxilla of Papilio hospiton

Crava

¹

,

Bobkov

²

,

Sollai

³

et al. 2022

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Among the butterflies of the genus Papilio (Lepidoptera: Papilionidae), Papilio hospiton (Géné) has a geographical distribution limited to the Mediterranean islands of Sardinia (Italy) and Corsica (France). This is mainly due to the host range that includes only a few plant species of Apiaceae and Rutaceae growing on these islands. In a previous electrophysiological investigation conducted on the maxillary gustatory system of larvae of P. hospiton and its closely phylogenetically related species Papilio machaon, a significantly higher spike activity was shown for the gustatory neurons of lateral and medial styloconic sensilla in P. hospiton when bitter compounds were tested. This effect was possibly correlated to the limited host choice range for P. hospiton. To shed light on the molecular aspects of this phenomenon, we investigated the expression pattern of sensory-related sequences by conducting a transcriptomic analysis from total RNA isolates of P. hospiton larval maxillae. We identified several transcripts that may be involved in taste (one gustatory receptor, one divergent ionotropic receptor, and several transient receptor potential channels, TRPs) as well as transcripts supporting an olfactory function for this appendage, including odorant receptors (ORs), antennal ionotropic receptors (A-IRs), sensory neuron membrane proteins (SNMPs), and odorant-binding proteins (OBPs). We used Human Embryonic Kidney (HEK293A) cells to heterologously express two of the identified receptors, PhospOR1 and PhospPain, together with their orthologs from P. machaon, for functional characterization. While our data suggest no activation of these two receptors by the ligands known so far to activate the electrophysiological response in larval maxillary neurons of Papilio species, nor temperature activation of both Papilio TRPA-channel Painless, they represent the first attempt in connecting neuronal activity with their molecular bases to unravel diet specialization between closely related Papilio species.

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“…While some previous data from D. melanogaster support a likely role of Painless in taste (Xu et al, 2008), no data are available for supporting the involvement of an OR in taste. However, previous data from the morphological, electrophysiological, and behavioral investigation on moths, among Noctuidae, Cambridae, Plutellidae, Pyralidae, and Yponomeutidae families, underlined the flexibility of the chemosensory systems associated with larval maxilla of Lepidoptera (Roessingh et al, 2007;Rana and Mohankumar, 2017). For example, in Lymantria dispar, a remarkable influence of maxillary palps in facilitating feeding by the organization of a complex neurosensory mechanism composed by gustatory sensilla together with the olfactory ones has been proposed (Solari et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

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“…While some previous data from D. melanogaster support a likely role of Painless in taste (Xu et al, 2008), no data are available for supporting the involvement of an OR in taste. However, previous data from the morphological, electrophysiological, and behavioral investigation on moths, among Noctuidae, Cambridae, Plutellidae, Pyralidae, and Yponomeutidae families, underlined the flexibility of the chemosensory systems associated with larval maxilla of Lepidoptera (Roessingh et al, 2007;Rana and Mohankumar, 2017). For example, in Lymantria dispar, a remarkable influence of maxillary palps in facilitating feeding by the organization of a complex neurosensory mechanism composed by gustatory sensilla together with the olfactory ones has been proposed (Solari et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

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Comparison of Sensory Structures Present on Larval Antennae and Mouthparts of Lepidopteran Crop Pests

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Cited by 11 publications

References 37 publications

Chemosensory Receptors in the Larval Maxilla of Papilio hospiton

Chemosensory Receptors in the Larval Maxilla of Papilio hospiton

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Table_1.xlsx

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