Chemosensory basis of larval performance of Papilio hospiton on different host plants

Sollai, Giorgia; Biolchini, Maurizio; Solari, Paolo; Crnjar, Roberto Massimo

doi:10.1016/j.jinsphys.2017.02.007

Cited by 27 publications

(33 citation statements)

References 34 publications

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“…C). We had previously found that a relationship exists between the degree of acceptance of a plant as host and the electrophysiological responses it evokes from gustatory sensilla (Sollai et al ., ,c). In this study the spike activity elicited from each tarsal GRN in response to leaf sap of Fcom is not statistically different from that of Stor, and both plant saps evoke spike responses from all four GRNs of each tarsal sensillum (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…We have previously shown that the P. hospiton larvae can discriminate between host plants by means of an ensemble and a spatiotemporal code (Sollai et al ., ). This is confirmed by the results of the present study which indicate that plant saps can be discriminated also by means of a temporal code, at least in the case of the medial sensillum, substantiating the idea that discrimination may be the outcome of several combined coding mechanisms principally involving the chemosensory neurons of the lateral and medial sensilla.…”

Section: Discussionmentioning

confidence: 99%

“…Leaf extracts were tested within 30 s after being pressed, according to Dethier and Crnjar () and Sollai et al . (,c). At the end of the recording series, KCl was tested again to check for any shift in responsiveness; whenever significant variations were detected, the experiment was discarded.…”

Section: Methodsmentioning

confidence: 99%

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Taste sensitivity and divergence in host plant acceptance between adult females and larvae ofPapilio hospiton

2018

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On the island of Sardinia the lepidopteran Papilio hospiton uses Ferula communis as exclusive host plant. However, on the small island of Tavolara, adult females lay eggs on Seseli tortuosum, a plant confined to the island. When raised in captivity on Seseli only few larvae grew beyond the first-second instar. Host specificity of lepidopterans is determined by female oviposition preferences, but also by larval food acceptance, and adult and larval taste sensitivity may be related to host selection in both cases. Aim of this work was: (i) to study the taste sensitivity of larvae and ovipositing females to saps of Ferula and Seseli; (ii) to cross-compare the spike activity of gustatory receptor neurons (GRNs) to both taste stimuli; (iii) to evaluate the discriminating capability between the two saps and determine which neural code/s is/are used. The results show that: (i) the spike responses of the tarsal GRNs of adult females to both plant saps are not different and therefore they cannot discriminate the two plants; (ii) larval L-lat GRN shows a higher activity in response to Seseli than Ferula, while the opposite occurs for the phagostimulant neurons, and larvae may discriminate between the two saps by means of multiple neural codes; (iii) the number of eggs laid on the two plants is the same, but the larval growth performance is better on Ferula than Seseli. Taste sensitivity differences may explain the absence of a positive relationship between oviposition preferences by adult females and plant acceptance and growth performance by larvae.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Taste sensitivity and divergence in host plant acceptance between adult females and larvae ofPapilio hospiton

2018

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“…24 Since primary and secondary metabolites in plants are found in mixtures representing many different structures (Fig. 1), concentration-dependent interactions between ligands and GRs can occur and may have additive, synergistic or inhibitory effects, and they may influence the activation of GRNs.…”

Section: Mixtures Matter – the Interplay Of Primary And Secondary Plamentioning

confidence: 99%

Contact chemosensation of phytochemicals by insect herbivores

2017

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“…Invertebrates rely on chemical senses to mediate a number of complex behaviors such as courtship, aggregation, associative learning, and food searching (Dethier, ; Merivee et al ., ; Masala et al ., ; Yarmolinsky et al ., ; Solari et al ., ; Thiel & Breithaupt, ; Zhang et al ., ; Solari et al ., ; Walker et al ., ; Biolchini et al ., ; Lebreton et al ., ; Sollai et al ., ; Solari et al ., ). In particular, insects use both pheromones and kairomones present in their environment to select conspecific partners for mating and oviposition sites for egg laying (Feeny et al ., ; Sollai et al ., ; Solari et al ., ; Yu et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Octopamine modulates the activity of motoneurons related to calling behavior in the gypsy moth Lymantria dispar

et al. 2018

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A morphofunctional investigation of the different neuronal subpopulations projecting through each of the nerves IV-VI emerging bilaterally from the terminal abdominal ganglion (TAG) was correlated with the octopaminergic activity in the ganglion that controls the ovipositor movements associated with calling behavior in the female gypsy moth Lymantria dispar. Tetramethylrodamine-dextran backfills from nerve stumps resulted in a relatively low number of TAG projections, ranging from 12 to 13 for nerve pair IV, 12 to 14 for nerve pair V, and 8 to 9 for nerve pair VI. Furthermore, as assessed by electrophysiological recordings, a number of fibers within each of these nerves displays spontaneous tonic activity, also when the ganglion is fully disconnected from the ventral nerve cord (VNC). Octopamine (OA) applications to the TAG strongly enhanced the activity of these nerves, either by increasing the firing rate of a number of spontaneously firing units or by recruiting new ones. This octopaminergic activity affected calling behavior, and specifically the muscle activity leading to cycling extensions of the intersegmental membrane (IM) between segments VIII and IX (ovipositor). Our results indicate that in the female gypsy moth the octopaminergic neural activity of the TAG is coupled with extensions and retractions of IM for the purpose of releasing pheromone, where motor units innervated by nerve pair IV appear antagonistic with respect to those innervated by nerve pair V.

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Chemosensory basis of larval performance of Papilio hospiton on different host plants

Cited by 27 publications

References 34 publications

Taste sensitivity and divergence in host plant acceptance between adult females and larvae ofPapilio hospiton

Taste sensitivity and divergence in host plant acceptance between adult females and larvae ofPapilio hospiton

Contact chemosensation of phytochemicals by insect herbivores

Octopamine modulates the activity of motoneurons related to calling behavior in the gypsy moth Lymantria dispar

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