A confined taste area in a lepidopteran brain

Kvello, Pål; Almaas, Tor Jørgen; Mustaparta, Hanna

doi:10.1016/j.asd.2005.10.003

Cited by 24 publications

(31 citation statements)

References 39 publications

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“…Nevertheless, the projection pattern of axons housed by the sensilla styloconica of H. armigera larvae, as presented here, is partly similar to the pattern of taste afferents in adults of the closely related species, H. virescens . Thus, in the adult, taste neurons originating from the sensilla styloconica on the proboscis also enter the SOG via the MxN [52], [53]. In addition, these gustatory afferents are reported to target a dorsal region of the ipsilateral SOG/tritocerebrum, similarly to the present findings [52], [53].…”

Section: Discussionsupporting

confidence: 84%

“…Thus, in the adult, taste neurons originating from the sensilla styloconica on the proboscis also enter the SOG via the MxN [52], [53]. In addition, these gustatory afferents are reported to target a dorsal region of the ipsilateral SOG/tritocerebrum, similarly to the present findings [52], [53]. Some additional axons originating from the proboscis were reported to target bilateral regions located anteriorly in the SOG [52].…”

Section: Discussionsupporting

confidence: 80%

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Central Projections of Gustatory Receptor Neurons in the Medial and the Lateral Sensilla Styloconica of Helicoverpa armigera Larvae

et al. 2014

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Food selection behavior of lepidopteran larvae is predominantly governed by the activation of taste neurons present in two sensilla styloconica located on the galea of the maxilla. In this study, we present the ultrastructure of the sensilla styloconica and the central projection pattern of their associated receptor neurons in larvae of the heliothine moth, Helicoverpa armigera. By means of light microscopy and scanning electron microscopy, the previous findings of two morphologically fairly similar sensilla comprising a socketed conic tip inserted into a large peg were confirmed. However, the peg size of the medial sensillum was found to be significantly bigger than that of the lateral sensillum. The sensory neurons derived from each sensillum styloconicum were mapped separately using anterograde staining experiments combined with confocal laser-scanning microscopy. For determining the afferents’ target regions relative to each other, we reconstructed the labeled axons and placed them into a common reference framework. The sensory axons from both sensilla projected via the ipsilateral maxillary nerve to the suboesophageal ganglion and further through the ipsilateral circumoesophageal connective to the brain. In the suboesophageal ganglion, the sensory projections targeted two areas of the ipsilateral maxillary neuropil, one located in the ventrolateral neuromere and the other adjacent to the neuromere midline. In the brain, the axon terminals targeted the dorso-anterior area of the ipsilateral tritocerebrum. As confirmed by the three-dimensional reconstructions, the target regions of the neural projections originating from each of the two sensilla styloconica were identical.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionsupporting

confidence: 80%

Central Projections of Gustatory Receptor Neurons in the Medial and the Lateral Sensilla Styloconica of Helicoverpa armigera Larvae

et al. 2014

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“…It is believed that the binding of the starch glucopyranose residue sterically hinders the receptor site, thereby preventing an electrophysiological response. Although the taste information from the sugar-receptor neurons may be transmitted through some intermediate neurons in the brain to stimulate the motor neurons driving food-sucking behavior (Kvello et al 2006), the competitive inhibition at the receptor site should depress the response of the sugar-receptor neuron and the subsequent feeding response of the butterfly.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, in V. indica, sugar-sensitive neurons are widely distributed in the tarsal sensilla (Morita et al 1957;Takeda 1961), whereas only a small proportion of the trichoid sensilla located laterally on the tarsi respond to sugar in Pieris rapae (Städler et al 1995). Alternatively, many lepidopteran adults have visible styloconic contact chemosensilla on the outside of the proboscis (e.g., Städler et al 1974;Sellier 1975;Altner and Altner 1986;Paulus and Krenn 1996;Krenn 1998;Krenn et al 2001;Petr and Stewart 2004;Molleman et al 2005;Kvello et al 2006). Three electrophysiological investigations have revealed the presence of sugar-sensitive neurons in the styloconic sensilla and their role in feeding behavior (Städler and Seabrook 1975;Blaney and Simmonds 1988;Ômura et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Sugar receptor response of the food-canal taste sensilla in a nectar-feeding swallowtail butterfly, Papilio xuthus

Inoue

Asaoka

Seta³

et al. 2008

Naturwissenschaften

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The feeding behavior in nectar-feeding insects is triggered by a sugar-receptor response in contact chemosensilla. The contact chemosensilla are distributed not only on tarsi and the outside of the proboscis but also on the inside of the food canal in Lepidoptera. Although the chemosensilla inside the food canal are assumed to detect sweet taste during the passage of nectar through the food canal, their electrophysiological function has received little attention. In the nectar-feeding Asian swallowtail butterfly, Papilio xuthus (Lepidoptera: Papilionidae), we found 15-to 30-μm-long sensilla neatly lined up along the inside galea wall, which forms the food canal in the proboscis. The receptor neurons of these sensilla responded to sucrose. We hypothesized that starch and sucrose compete with each other for a taste receptor site on the sensilla. When we added starch and sucrose to the food-canal sensilla, the electrophysiological responses of food-canal sensilla were inhibited in parallel with the food-sucking behavior of the butterflies. These results suggest that the food-canal sensilla are involved in the behavioral control of nectar-sucking in this butterfly species.

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“…In the gustatory system, the sucrose solution used as US is detected by the GRNs on the antennae and the proboscis, and information is conveyed to the suboesophageal ganglion and the tritocerebrum (Mitchell et al, 1999;Kvello et al, 2006;Jørgensen et al, 2006). In A. mellifera, the suboesophageal-calycal tract is comprised of neurons passing on information directly from the In nature, moths encounter nutritious and toxic substances in plants, and thus have to discriminate between a diversity of tastants.…”

Section: Introductionmentioning

confidence: 99%

Effects of two bitter substances on olfactory conditioning in the moth Heliothis virescens

Jørgensen

Stranden

Sandoz

et al. 2007

Journal of Experimental Biology

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-1 sucrose concentration gave similar acquisition, retention and extinction performances. Experiments involving preexposure or facilitated extinction with an odour paired with quinine, sinigrin or no tastant showed a latent inhibitory effect, as well as an aversive effect of quinine and, to a lesser extent, of sinigrin. The results suggested that the two tastants may act as negative reinforcers in H. virescens.

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A confined taste area in a lepidopteran brain

Cited by 24 publications

References 39 publications

Central Projections of Gustatory Receptor Neurons in the Medial and the Lateral Sensilla Styloconica of Helicoverpa armigera Larvae

Central Projections of Gustatory Receptor Neurons in the Medial and the Lateral Sensilla Styloconica of Helicoverpa armigera Larvae

Sugar receptor response of the food-canal taste sensilla in a nectar-feeding swallowtail butterfly, Papilio xuthus

Effects of two bitter substances on olfactory conditioning in the moth Heliothis virescens

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