Peripheral and central structures involved in insect gustation

Mitchell, B. K.; Itagaki, Haruhiko; Rivet, Marie-Pascale

doi:10.1002/(sici)1097-0029(19991215)47:6<401::aid-jemt4>3.0.co;2-7

Cited by 124 publications

(81 citation statements)

References 68 publications

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“…Although the sensory inputs and genetic pathways involved in D. melanogaster oviposition preference are relatively uncharacterized, the role of taste and olfaction in egg laying of other insects has been investigated (1,6,14,15). In addition, AA can be aversive to D. melanogaster in certain olfactory assays (5,16).…”

Section: Egg-laying Preference For and Positional Aversion To Aa-contmentioning

confidence: 99%

Oviposition preference for and positional avoidance of acetic acid provide a model for competing behavioral drives in Drosophila

Joseph¹,

Devineni²,

King

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

193

235

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Selection of appropriate oviposition sites is essential for progeny survival and fitness in generalist insect species, such as Drosphila melanogaster, yet little is known about the mechanisms regulating how environmental conditions and innate adult preferences are evaluated and balanced to yield the final substrate choice for eggdeposition. Female D. melanogaster are attracted to food containing acetic acid (AA) as an oviposition substrate. However, our observations reveal that this egg-laying preference is a complex process, as it directly opposes an otherwise strong, default behavior of positional avoidance for the same food. We show that 2 distinct sensory modalities detect AA. Attraction to AA-containing food for the purpose of egg-laying relies on the gustatory system, while positional repulsion depends primarily on the olfactory system. Similarly, distinct central brain regions are involved in AA attraction and repulsion. Given this unique situation, in which a single environmental stimulus yields 2 opposing behavioral outputs, we propose that the interaction of egg-laying attraction and positional aversion for AA provides a powerful model for studying how organisms balance competing behavioral drives and integrate signals involved in choice-like processes.choice behavior ͉ gustatory system ͉ olfactory system ͉ mushroom body ͉ ellipsoid body O viposition provides a powerful yet simple means for monitoring preference behavior in Drosophila melanogaster, since a laid egg represents a marker for female position. Past studies have used egg laying as a readout for conditions advantageous to progeny development (1, 2), in which oviposition preference effectively separates larvae of different sibling species of Drosophila. Egg laying has also been used to detect aversion toward compounds toxic to both larvae and adults (3, 4). Furthermore, numerous studies have used patterns of oviposition to distinguish subtle differences in host plant preferences, which have provided insights into resource requirements and ecological behaviors of different Drosophila species (5, 6).Despite numerous studies using oviposition-site selection as a behavioral readout, direct study of the relevant sensory circuits and the oviposition program itself have been initiated only recently in D. melanogaster (7,8). To investigate the genetic mechanisms and neural circuits regulating this important behavioral choice in D. melanogaster, we developed a simple yet robust 2-choice assay that utilizes acetic acid (AA), a naturally occurring product of fruit fermentation, as an egg-laying attractant (9, 10). However, in addition to verifying a strong egg-laying preference for AA, we surprisingly observed D. melanogaster show a strong positional aversion to the same AA-containing food. We demonstrate that when sampling for oviposition sites, females integrate input from distinct sensory modalities to choose a particular behavioral output from 2 competing options: ovipositional attraction for and positional repulsion to AA. Egg-laying preference is p...

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Section: Egg-laying Preference For and Positional Aversion To Aa-contmentioning

confidence: 99%

Oviposition preference for and positional avoidance of acetic acid provide a model for competing behavioral drives in Drosophila

Joseph¹,

Devineni²,

King

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

193

235

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“…2E). Two additional groups of neurons labeled with GFP innervate the labral sense organs (LSO) (Stocker, 1994;Mitchell et al, 1999). This paired organ of the internal mouth parts is composed of six mechanosensory and eight chemosensory neurons (Singh, 1997), about six of which express GFP (Fig.…”

Section: Late Enhancer Active In Chemosensory Neurons Of All Taste Brmentioning

confidence: 99%

TheDrosophila Pox neurogene: control of male courtship behavior and fertility as revealed by a complete dissection of all enhancers

2002

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“…Axons project to the central nervous system and, in particular, those from labellar sensilla into the subesophageal ganglion, while those from tarsal sensilla into the thoracic-abdominal ganglion (Mitchell et al 1999;Wang et al 2004;Kwon et al 2014). Recently, Masala et al (2014) showed that labellar sensilla of the medfly contain four gustatory receptor neurons (GRNs), that responded to different stimuli like sodium chloride (NaCl) and fructose.…”

Section: Introductionmentioning

confidence: 99%

Morphological and electrophysiological analysis of tarsal sensilla in the medfly Ceratitis capitata (Wiedemann, 1824) (Diptera: Tephritidae)

Loy

Solari

Isola

et al. 2016

Italian Journal of Zoology

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The Mediterranean fruit fly, Ceratitis capitata (Wiedemann, 1824) (Diptera: Tephritidae), is a polyphagous pest in horticulture, mainly targeting pomaceous and citrus fruits. To gain better knowledge about its chemosensory system related to taste, essential for behavioural strategies and localisation of host plants, we examined the tarsal external morphology by highresolution scanning electron microscopy, focusing on sensilla. Numerous trichoid and chaetica sensilla, related to taste and mechanoreceptor systems, and other types of sensilla are present in tarsal segments. The responses of specific trichoid chemosensilla were also studied through electrophysiological experiments by stimulation with sodium chloride, fructose and four bitter stimuli. Electrophysiological data allowed us to distinguish three types of different neurons: high ("H"), middle ("M") and small ("S"). Increasing concentrations of sodium chloride enhanced the activity of H cells, while fructose boosted M cells activity. On the contrary, S cells showed no increase in spike activity after stimulation with these substances. Bitter stimuli induced no significant response on these cells. Behavioural assays showed no statistical difference among the responses to sugars, bitter substances and citric acid. Our results on taste stimuli will be useful in increasing knowledge of Ceratitis chemoreception, fundamental in new integrated pest management.

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Peripheral and central structures involved in insect gustation

Cited by 124 publications

References 68 publications

Oviposition preference for and positional avoidance of acetic acid provide a model for competing behavioral drives in Drosophila

Oviposition preference for and positional avoidance of acetic acid provide a model for competing behavioral drives in Drosophila

TheDrosophila Pox neurogene: control of male courtship behavior and fertility as revealed by a complete dissection of all enhancers

Morphological and electrophysiological analysis of tarsal sensilla in the medfly Ceratitis capitata (Wiedemann, 1824) (Diptera: Tephritidae)

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