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A model of stimulus-specific neural assemblies in the insect antennal lobe Inra
Martinez, D.; Montejo, N..
A fundamental question in computational neuroscience is to understand how interactions between neurons underlie sensory coding and information storage. In the first relay of the insect olfactory system, odorant stimuli trigger synchronized activities in neuron populations. Synchronized assemblies may arise as a consequence of inhibitory coupling, because they are disrupted when inhibition is pharmacologically blocked. Using computational modelling, we studied the role of inhibitory, noisy interactions in producing stimulus-specific synchrony. So far, experimental data and modelling studies indicate that fast inhibition induces neural synchrony, but it remains unclear how desynchronization occurs. From theoretical analysis and computer simulations, we found...
Tipo: Journal Article Palavras-chave: DROSOPHILE; NEURONE; OLFACTION; INSECTE; MODELE; LOBE ANTENNAIRE; ODEUR; STIMULUS; ANALYSE STATISTIQUE OLFACTORY-BULB; INHIBITORY NEURONS; OSCILLATORY SYNCHRONIZATION; ODOR REPRESENTATION; OUTPUT NEURONS; NETWORK MODEL; DROSOPHILA; DYNAMICS; DISCRIMINATION; INFORMATION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201028bfe973&uri=/notices/prodinra1/2010/10/
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Analyse des effets, en particulier de la répulsivité, d’un pyréthrinoïde de synthèse, la deltaméthrine, sur les abeilles Inra
Bos, C.; Masson, C..
La deltaméthrine Décis® est un pyréthrinoïde de synthèse récemment apparu sur le marché ; comme tous les pyréthrinoïdes, la deltaméthrine est employée à très faible dose (5 g/ha de matière active contre méligèthes sur colza) et est très répulsive pour les abeilles. Nous avons étudié l’effet répulsif des adjuvants de fabrication de la deltaméthrine par des tests en cage de vol et en serre. Une expérimentation « grandeur nature » sur 30 ha de colza avec 3 ruchers nous a permis d’observer le peu de risque, au moins à court terme, que représente la deltaméthrine pour les abeilles dans des conditions normales d’emploi. Cet exemple concret est une nouvelle occasion de montrer que les mécanismes d’intoxication et de perception olfactive d’une substance...
Tipo: Journal Article Palavras-chave: PESTICIDE; OLFACTION; ATTRACTIF; SYNERGIE; TEST LABORATOIRE; TEST PLEIN CHAMP; REPULSIVITE; PYRETHRINOIDE; DELTAMETHRINE.
Ano: 1983 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20082f7e78ad&uri=/notices/prodinra1/2008/08/
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Antennal pathways in the central nervous system of a blood-sucking bug, Rhodnius prolixus Inra
Barrozo, R.B.; Couton, L.; Lazzari, C.R.; Insauti, T.C.; Minoli, S.A.; Fresquet, N.; Rospars, J.P.; Anton, S..
The haematophagous bug Rhodnius prolixus has been a model system in insect physiology for a long time. Recently, several studies have been devoted to its sensory systems, including olfaction. However, few data are available on the basic organisation of the nervous system in this species. By means of neuronal backfills, histology, confocal microscopy and three-dimensional reconstruction methods, we have characterized the projection patterns of antennal sensory neurons within the central nervous system of this disease-vector insect. We established the first partial three-dimensional map of the antennal lobe (AL) of a hemipteran insect. The ALs of this species are relatively diffuse structures, which nevertheless show a glomerular organisation. Based on...
Tipo: Journal Article Palavras-chave: RHODNIUS PROLIXUS; ARTHROPODA; HEXAPODA; INSECTE; HEMIPTERA; SYSTEME NERVEUX CENTRAL; NEURONE; OLFACTION; HISTOLOGIE; MICROSCOPIE CONFOCALE; CARTE TRIDIMENSIONNELLE; LOBE ANTENNAIRE; GLOMERULE; HETEROPTERA; REDUVIIDAE ANTENNAL LOBE; THREE-DIMENSIONAL RECONSTRUCTION; QUANTITATIVE ANALYSIS; DISEASE-VECTOR INSECT; ANTENNAL PROJECTIONS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010f9cf078d&uri=/notices/prodinra1/2010/11/
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Calcium activates a chloride conductance likely involved in olfactory receptor neuron repolarization in the moth Spodoptera littoralis Inra
Pézier, A.; Grauso, M.; Acquistapace, A.; Monsempes, C.; Rospars, J.P.; Lucas, P..
The response of insect olfactory receptor neurons (ORNs) to odorants involves the opening of Ca2+-permeable channels, generating an increase in intracellular Ca2+ concentration. Here, we studied the downstream effect of this Ca2+ rise in cultured ORNs of the moth Spodoptera littoralis. Intracellular dialysis of Ca2+ from the patch pipette in whole-cell patch-clamp configuration activated a conductance with a K-1/2 of 2.8 mu M. Intracellular and extracellular anionic and cationic substitutions demonstrated that Cl- carries this current. The anion permeability sequence I- > NO3- > Br- > Cl- > CH3SO(3)(-) >> gluconate(-) of the Ca2+-activated Cl- channel suggests a weak electrical field pore of the channel. The Ca2+-activated current partly...
Tipo: Journal Article Palavras-chave: CALCIUM; OLFACTION; NEURONE; RECEPTEUR; MITE; SPODOPTERA LITTORALIS; LEPIDOPTERA; INSECTE; CANAL A CALCIUM; CHLORURE; PERMEABILITE; CONCENTRATION; TENEUR EN CALCIUM NUCLEOTIDE-GATED CHANNELS; SMOOTH-MUSCLE-CELLS; PROTEIN-KINASE-C; ANTENNAL NEURONS; SENSORY NEURONS; IN-VITRO; CURRENTS; TRANSDUCTION; VOLUME; CILIA.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010398ba406&uri=/notices/prodinra1/2010/10/
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Characterization of an antennal carboxylesterase from the pest moth Spodoptera littoralis degrading a host plant odorant Inra
Durand, N.; Carot-Sans, G.; Chertemps, T.; Bozzolan, F.; Party, V.; Renou, M.; Debernard, S.; Rosell, G.; Maïbèche-Coisne, M..
Background: Carboxyl/cholinesterases (CCEs) are highly diversified in insects. These enzymes have a broad range of proposed functions, in neuro/developmental processes, dietary detoxification, insecticide resistance or hormone/ pheromone degradation. As few functional data are available on purified or recombinant CCEs, the physiological role of most of these enzymes is unknown. Concerning their role in olfaction, only two CCEs able to metabolize sex pheromones have been functionally characterized in insects. These enzymes are only expressed in the male antennae, and secreted into the lumen of the pheromone-sensitive sensilla. CCEs able to hydrolyze other odorants than sex pheromones, such as plant volatiles, have not been identified. Methodology: In...
Tipo: Journal Article Palavras-chave: LEPIDOPTERA; NOCTUIDAE; HEXAPODA; PCR; ADNC; SDS PAGE; EXPRESSION DES GENES; ELECTROPHORESE; CARBOXYLESTERASE; SPODOPTERA LITTORALIS; OLFACTION; ODEEUR; PLANTE HOTE; INSECTE; ENZYME; BIOLOGIE MOLECULAIRE; BIOCHIMIE; ELECTROPHYSIOLOGIE; PHEROMONE; PHEROMONE SEXUELLE; RECOMBINAISON; PROTEINE.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010229c7cd1&uri=/notices/prodinra1/2011/05/
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Cloning and expression pattern of a putative octopamine/tyramine receptor in antennae of the noctuid moth Mamestra brassicae Inra
Brigaud, I.; Grosmaître, X.; Francois, M.C.; Jacquin-Joly, E..
In insects, biogenic amines have been shown to play an important role in olfactory plasticity. In a first attempt to decipher the underlying molecular mechanisms, we report the molecular cloning and precise expression pattern of a newly identified octopamine/tyramine-receptor-encoding gene in the antennae of the noctuid moth Mamestra brassicae (MbraOAR/TAR). A full-length cDNA has been obtained through homology cloning in combination with rapid amplification of cDNA ends/polymerase chain reaction; the deduced protein exhibits high identities with previously identified octopamine/tyramine receptors in other moths. In situ hybridization within the antennae has revealed that MbraOAR/TAR is expressed at the bases of both pheromone-sensitive and non-sensitive...
Tipo: Journal Article Palavras-chave: CLONAGE; LOBE ANTENNAIRE; NOCTUIDAE; MITE; HEXAPODA; ARTHROPODA; AMINE BIOGENIQUE; RECEPTEUR; CLONAGE MOLECULAIRE; ADNC; POLYMORPHISME; PCR; PHEROMONE; LEPIDOPTERA; MAMESTRA BRASSICAE OCTOPAMINE/TYRAMINE RECEPTOR; EXPRESSION PATTERN; OLFACTION; OLFACTORY PLASTICITY.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201084fc8d7c&uri=/notices/prodinra1/2010/11/
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Cloning of an octopamine/tyramine receptor and plasticity of its expression as a function of adult sexual maturation in the male moth Agrotis ipsilon Inra
Duportets, L.; Barrozo, R.B.; Bozzolan, F.; Gaertner, C.; Anton, S.; Gadenne, C.; Debernard, S..
In the male moth Agrotis ipsilon behavioural response and antennal lobe (AL) neuron sensitivity to the female-produced sex pheromone increase with age and juvenile hormone (JH) level. We recently showed that the neuromodulator, octopamine (OA), interacts with JH in this age-dependent olfactory plasticity. To further elucidate its role, we cloned a full cDNA encoding a protein that presents biochemical features essential to OA/tyramine receptor (AipsOAR/TAR) function. The AipsOAR/TAR transcript was detected predominantly in the antennae, the brain and, more specifically, in ALs where its expression level varied concomitantly with age. This expression plasticity indicates that AipsOAR/TAR might be involved in central processing of the pheromone signal during...
Tipo: Journal Article Palavras-chave: LOBE ANTENNAIRE; LEPIDOPTERA; NOCTUIDAE; AGROPIS IPSILON; RECEPTEUR; OLFACTION; MITE; INSECTE; MATURATION SEXUELLE; ARTHROPODA; HEXAPODA; NEURONE; PHEROMONE; HORMONE; ADNC; CLONAGE; COMPORTEMENT SEXUEL; ATTRACTIF SEXUEL ANTENNAL LOBE; OCTOPAMINE/TYRAMINE RECEPTOR; OLFACTORY PROCESSING; MATURATION; EXPRESSION PLASTICITY.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20102d18e75d&uri=/notices/prodinra1/2011/02/
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Competitive and noncompetitive odorant interactions in the early neural coding of odorant mixtures Inra
Rospars, J.P.; Lansky, P.; Chaput, M.; Duchamp-Viret, P..
Most olfactory receptor neurons (ORNs) express a single type of olfactory receptor that is differentially sensitive to a wide variety of odorant molecules. The diversity of possible odorant-receptor interactions raises challenging problems for the coding of complex mixtures of many odorants, which make up the vast majority of real world odors. Pure competition, the simplest kind of interaction, arises when two or more agonists can bind to the main receptor site, which triggers receptor activation, although only one can be bound at a time. Noncompetitive effects may result from various mechanisms, including agonist binding to another site, which modifies the receptor properties at the main binding site. Here, we investigated the electrophysiological...
Tipo: Journal Article Palavras-chave: CODAGE; MODELE; OLFACTION; NEURONE; RECEPTEUR; ODEUR; INTERACTION MOLECULAIRE; CONCENTRATION; ANALYSE STATISTIQUE  SENSORY CODING; OLFACTORY RECEPTOR NEURON; IN VIVO; SIGNAL TRANSDUCTION; ALLOSTERY; MIXTURE INTERACTION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20105031bac0&uri=/notices/prodinra1/2010/10/
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Efficient olfactory coding in the pheromone receptor neuron of a moth Inra
Kostal, L.; Lansky, P.; Rospars, J.P..
Efficient coding is an overarching principle, well tested in visual and auditory neurobiology, which states that sensory neurons are adapted to the statistical characteristics of their natural stimulus - in brief, neurons best process those stimuli that occur most frequently. To assess its validity in olfaction, we examine the pheromone communication of moths, in which males locate their female mates by the pheromone they release. We determine the characteristics of the pheromone plume which are best detected by the male reception system. We show that they are in agreement with plume measurements in the field, so providing quantitative evidence that this system also obeys the efficient coding principle. Exploring the quantitative relationship between the...
Tipo: Journal Article Palavras-chave: ANTHERAEA POLYPHEMUS; INSECTE; LEPIDOPTERA; ANALYSE STATISTIQUE; CHEMORECEPTEUR; MODELE CINETIQUE; MITE; OLFACTION; PHEROMONE; NEURONE; RECEPTEUR; STIMULATION; COMMUNICATION; MODELISATION; PROBABILITE ORIENTAL FRUIT MOTH; ANTHERAEA-POLYPHEMUS; KINETIC-MODEL; INFORMATION; STIMULATION; PLUMES; CELLS; CHEMORECEPTORS; FLUCTUATIONS; ACTIVATION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010f45c7b7b&uri=/notices/prodinra1/2010/10/
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Elemental and configural processing of odour mixtures in the newborn rabbit Inra
Coureaud, G.; Hamdani, Y.; Schaal, B.; Thomas-Danguin, T..
The processing of odour mixtures by young organisms is poorly understood. Recently, the perception of an AB mixture, known to engage configural perception in adult humans, was suggested also to be partially configural in newborn rabbits. In particular, pups did not respond to AB after they had learned A or B. However, two alternative hypotheses might be suggested to explain this result: the presence in the mixture of a novel odorant that inhibits the response to the learned stimulus, and the unevenness of the sensory and cognitive processes engaged during the conditioning and the behavioural testing. We conducted four experiments to explore these alternative hypotheses. In experiment 1, the learning of A or B ended in responses to mixtures including a...
Tipo: Journal Article Palavras-chave: NEONATAL BEHAVIOUR; APPETITIVE LEARNING; CONFIGURAL PERCEPTION; OLFACTION; BLENDING MIXTURE; MAMMARY PHEROMONE; RABBIT.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010fe95eab7&uri=/notices/prodinra1/2011/06/
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Floral volatiles of Tanacetum vulgare L. attractive to Lobesia botrana Den. et Schiff. females Inra
Gabel, B.; Thiery, D.; Suchy, V.; Marion-Poll, F.; Hradsky, P.; Farkas, P..
The European grapevine moth (EGVM), Lobesia botrana, is a major pest of grapes in Europe. Females are attracted to a nonhost plant: tansy (Tanacetum vulgare L.), which is a common weed in Slovakian vineyards. A steam distillate extract of tansy flowers was analyzed by means of a GC-EAG technique to screen constituents detected by the olfactory receptors of EGVM females. From more than 200 GC peaks, nine peaks corresponding to monoterpenoids released an EAG response in more than 70% of the females (N=15):p-cymene,d-limonene,α-thujene,α-thujone,β-thujone, thujyl alcohol, terpinene-4-ol, (Z)-verbenol, and piperitone. The steam distillate of tansy as well as a synthetic blend of identified compounds released consistent attraction in a field cage. The use of...
Tipo: Journal Article Palavras-chave: LOBESIA BOTRANA; TANACETUM VULGARE; TANAISIE; LEPIDOPTERA; TORTRICIDAE; ATTRACTION; DEPREDATEUR; CHROMATOGRAPHIE EN PHASE GAZEUSE; SPECTROMETRIE DE MASSE; ELECTROANTENNOGRAPHIE; MEDIATEUR CHIMIQUE; TERPENOIDE LOBESIA BOTRANA; VITIS VINIFERA; TANACETUM VULGARE; TANSY; GRAPEVINE; LEPIDOPTERA; TORTRICIDAE; COMPOSITAE; PLANT-INSECT RELATIONSHIPS; OLFACTION; ALLELOCHEMICALS; TERPENOIDS; COUPLING GC-EAG.
Ano: 1992 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB920002500600028663&uri=/notices/prodinra1/2010/11/
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Individual learning ability and complex odor recognition in the honey bee, Apis mellifera L. Inra
Laloi, D.; Roger, B.; Blight, M.M.; Wadhams, L.J.; Pham-Delègue, M.H..
Individually restrained worker bees were trained to recognize complex odors in a conditioned proboscis extension assay. Three groups of bees were considered, based on the responses recorded during the experimental procedure: selective learners, nonselective learners, and nonlearners. For conditioning, three concentrations of two synthetic mixtures were used. The distribution of bees between groups was not significantly affected by the nature or by the concentration of the conditioning mixture. After conditioning, bees were tested with the individual compounds, and the responses were analyzed with respect to the three groups. Selective learners showed discriminative responses to a few key compounds, while nonselective learners responded to all the...
Tipo: Journal Article Palavras-chave: PROBOSCIS; ABEILLE DOMESTIQUE; APIS MELLIFERA; INSECTE UTILE; ODEUR; DIFFERENCIATION; APTITUDE HONEYBEE; LEARNING; PROBOSCIS EXTENSION; OLFACTION; ODOR MIXTURE.
Ano: 1999 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0400002758104388&uri=/notices/prodinra1/2010/11/
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Les récepteurs olfactifs et le codage des odeurs Inra
Le Bon, A.M.; Tromelin, A.; Thomas-Danguin, T.; Briand, L..
La première étape de la détection olfactive implique l’activation de récepteurs olfactifs par les molécules odorantes. Ces récepteurs sont des protéines membranaires contenues dans la membrane des cils portés par les neurones sensoriels olfactifs localisés dans l’épithélium olfactif. Le codage de l’odeur résulte de l’activation combinatoire d’un ensemble de récepteurs et repose sur leur expression clonale. La connectique neuronale aboutit à la formation, dans le cortex, d’une image sensorielle olfactive qui est perçue consciemment en tant qu’odeur. Ce système combinatoire permet, avec seulement environ 340 récepteurs différents, de discriminer des myriades de molécules odorantes naturelles ou non (nouvelles flaveurs culinaires, molécules de synthèse,...
Tipo: Journal Article Palavras-chave: CODAGE OLFACTIF; ÉVOLUTION; ODEUR; OLFACTION; RECEPTEURS OLFACTIFS; MELANGES D’ODORANTS EVOLUTION; OLFACTION; ODOUR; ODOUR CODING; OLFACTORY RECEPTORS; ODORANT MIXTURES.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20106fc5e9e8&uri=/notices/prodinra1/2011/04/
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Mating-induced transient inhibition of responses to sex pheromone in a male moth is not mediated by octopamine or serotonin Inra
Barrozo, R.; Jarriault, D.; Simeone, X.; Gaertner, C.; Gadenne, C.; Anton, S..
In the male moth, Agrotis ipsilon, mating induces a transient inhibition of behavioural and central nervous responses to sex pheromone. Newly mated males are not attracted to sex pheromone, and the sensitivity of their antennal lobe (AL) neurons is lower than in virgin males. This rapid transient olfactory inhibition prevents them from re-mating unsuccessfully until they have refilled their sex glands. We hypothesized that this olfactory ‘switch off’ might be controlled by neuromodulators such as biogenic amines. To test our hypothesis, we studied the effects of octopamine (OA) and serotonin (5-hydroxytryptamine, 5-HT) on the coding properties of pheromone-sensitive AL neurons in virgin and newly mated males. We show that AL neuron sensitivity increased in...
Tipo: Journal Article Palavras-chave: AGROTIS IPSILON; INSECTE; MITE; OLFACTION; ODEUR; LOBE ANTENNALE; PHEROMONE SEXUELLE; ATTRACTIF SEXUEL; SEROTONINE; PLASTICITE; SYSTEME NERVEUX CENTRAL; NEURONE; RECEPTEUR; OCTOPAMINE; NOCTUIDAE; LEPIDOPTERA OLFACTORY CODING; MOTH; ANTENNAL LOBE; SEX PHEROMONE; PROJECTION NEURON; MATING; OCTOPAMINE; SEROTONIN; PLASTICITY.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010e7ad9fc3&uri=/notices/prodinra1/2010/09/
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Modulation of flight activity in Lobesia botrana Den. and Schiff. (Lepidoptera : Tortricidae) females studied in a wind tunnel Inra
Hurtrel, B.; Thiéry, D..
We studied modulations of flight activity in European grapevine moth females (EGVM) by individual observations in a wind tunnel. The effect of different factors was analyzed: variation in atmospheric pressure prior to the experiments, time of day, first experience of flight, age, mating, and odor of tansy, which attracts females. The circadian flight activity showed a peak the hour preceding the onset of scotophase and sustained activity occurred during the 6 h around this peak. Females with a flight experience in the tunnel took off more quickly than naive ones (3.9 ± 7.4 vs 20.3 ± 22.8 s). Three-day-old unmated females subjected to negative variations of atmospheric pressure (10 hPa) during the 4 h prior to the experiments increased their duration of...
Tipo: Journal Article Palavras-chave: TUNNEL DE VOL; LOBESIA BOTRANA; LEPIDOPTERE; TORTRICIDAE; COMPORTEMENT DE VOL; ATTRACTION; PRESSION ATMOSPHERIQUE; VIGNOBLE; PHEROMONE SEXUELLE; ACCOUPLEMENT LEPIDOPTERA; TORTRICIDAE; LOBESIA BOTRANA; FLIGHT ACTIVITY; WIND TUNNEL; ATMOSPHERIC PRESSURE; FLIGHT EXPERIENCE; MATING; AGE; OLFACTION.
Ano: 1999 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9900011937079444&uri=/notices/prodinra1/2010/11/
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Molecular basis of female-specific odorant responses in Bombyx mori Inra
Anderson, A.R.; Wanner, K.W.; Trowell, S.C.; Warr, C.G.; Jacquin-Joly, E.; Zagatti, P.; Robertson, H.; Newcomb, R.D..
Males and females of many moth species exhibit important differences in sexual behaviours. Much research in this field has focused on the male-specific behaviour, electrophysiology and molecular biology of sex pheromone reception. Female-specific behaviours have been less well studied although, like male-specific behaviours, they could provide opportunities for intervention and management of lepidopteran pests. Previously, we identified genes encoding putative odorant receptors (ORs) from the genome of the silkworm, Bombyx mori, some of which have higher levels of steady-state transcript in the antennae of adult females compared with males. We have identified the full-length cDNA sequences of some of these ORs and described a novel OR that is part of a...
Tipo: Journal Article Palavras-chave: TERPENE; ACIDE BENZOIQUE; PHENYLETHANOL; BENZALDEHYDE; ELECTROPHYSIOLOGIE; SEQUENCE NUCLEOTIDIQUE; ODEUR; HYPOTHENEMUS HAMPEI; ARTHROPODA; HEXAPODA; INSECTE; RECEPTEUR; PLANTE; COMPOSE VOLATILE; COMPORTEMENT SEXUEL; ATTRACTIF SEXUEL; ADNC; BIOLOGIE MOLECULAIRE; LEPIDOPTERA BOMBYX MORI; OLFACTION; ODORANT RECEPTORS; PLANT VOLATILES; PHEROMONE.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20101ffb559b&uri=/notices/prodinra1/2010/11/
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Molecular characterization of a phospholipase C β potentially involved in moth olfactory transduction Inra
Chouquet, B.; Lucas, P.; Bozzolan, F.; Solvar, M.; Maïbèche-Coisné, M.; Durand, N.; Debernard, S..
To clarify the role of phospholipase C (PLC) in insect olfactory transduction, we have undertaken its molecular identification in the moth Spodoptera littoralis. From the analysis of a male antennal expressed sequence tag library, we succeeded in cloning a full-length cDNA encoding a PLC that belongs to the cluster of PLC-b subtypes. In adult males, the PLC-b transcript was located predominantly in brain and antennae where its presence was detected in the olfactory sensilla trichodea. Moreover, PLC-b was expressed in antennae at the beginning of the pupal stage, then reached a maximum at the end of this stage and was maintained at this level during the adult period. Taken together, these results provided molecular evidence for the putative participation of...
Tipo: Journal Article Palavras-chave: INSECTE; PHOSPHOLIPASE; OLFACTION; ODEUR; MITE; TECHNIQUE ANALYTIQUE; SEQUENCE NUCLEOTIDIQUE; EXPRESSION DES GENES; ADNC; TRANSCRIPTION; NORTHERN BLOT; ELECTROPHORESE; PCR; CLONAGE MOLECULAIRE; ANALYSE PHYLOGENETIQUE; LEPIDOPTERA; NOCTUELLE MEDITERRANEENNE EXPRESSION PATTERNS; OLFACTORY SYSTEM; PHOSPHOLIPASE C; SPODOPTERA LITTORALIS; SIGNAL TRANSDUCTION.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20108d7c7c75&uri=/notices/prodinra1/2010/09/
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Natural ligands of porcine olfactory binding proteins Inra
Le Danvic, C.; Guiraudie-Capraz, G.; Abderrahmani, D.; Zanetta, J.P.; Nagnan-Le Meillour, P..
Knowledge of endogenous ligands of olfactory binding proteins is a prerequisite for studying their role in odor and pheromone transduction. Here, we report the extraction, derivatization, and characterization by gas chromatography-mass spectrometry of the natural ligands of pig, Sus scrofa (L.), Von Ebner’s Gland protein (VEG) and odorant binding protein (OBP). We identified two isoforms (VEG1 and VEG2), which differed only by the linkage of an O-N-acetylglucosamine (O-GlcNac) group on VEG1. The natural ligands of VEG1 were characterized as two isomers of testosterone, whereas ligands of VEG2 and OBP were fatty acids or their derivatives. Our findings suggest that the binding specificity of VEG1 for steroids is governed by the presence of an O-GlcNac...
Tipo: Journal Article Palavras-chave: MOLÉCULE ODORANTE ENDOGENOUS LIGAND; FATTY ACID; MALDI-TOF MASS SPECTROMETRY; ODORANT BINDING PROTEIN; OLFACTION; O-N-ACETYLGLUCOSAMINE; TESTOSTERONE; TRYTIC DIGESTION; VON EBNER'S GLAND PROTEIN.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20099a3bdd2f&uri=/notices/prodinra1/2010/11/
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Ordinary glomeruli in the antennal lobe of male and female tortricid moth Grapholita molesta (Busck) (Lepidoptera: Tortricidae) process sex pheromone and host-plant volatiles Inra
Varela, N.; Avilla, J.; Gemeno, C.; Anton, S..
Both sexes of Grapholita molesta, a key pest of stone fruits, are able to detect host-plant volatiles and the sex pheromone emitted by females, and to modify their behaviour accordingly. How olfactory information is processed in the central nervous system is unknown. Intracellular recordings and stainings were used to characterize antennal lobe (AL) neuron responses to single pheromone components, a behaviourally active blend of five peach volatiles and a pear-fruit ester. AL neurons with different response patterns responded to pheromone components and plant volatiles. In males more neurons responded specifically to the main pheromone component than in females, whereas neurons responding to all three pheromone components were more abundant in females....
Tipo: Journal Article Palavras-chave: LOBE ANTENNAIRE; CYDIA MOLESTA; ARTHROPODA; HEXAPODA; TORTRICIDAE; INSECTE; PHEROMONE SEXUELLE; ATTRACTIF SEXUEL; NEURONE; ODEUR; GLOMERULE GRAPHOLITA MOLESTA; OLFACTION; ANTENNAL LOBE; PHEROMONE; INTRACELLULAR RECORDING AND STAINING.
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201157fcd7c0&uri=/notices/prodinra1/2011/03/
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Parallel reinforcement pathways for conditioned food aversions in the honeybee Inra
Wright, G.A.; Mustard, J.A.; Simcock, N.K.; Ross-Taylor, A.A.R.; McNicholas, L.D.; Popescu, A.; Marion-Poll, F..
Avoiding toxins in food is as important as obtaining nutrition. Conditioned food aversions have been studied in animals as diverse as nematodes and humans [1, 2], but the neural signaling mechanisms underlying this form of learning have been difficult to pinpoint. Honeybees quickly learn to associate floral cues with food [3], a trait that makes them an excellent model organism for studying the neural mechanisms of learning and memory. Here we show that honeybees not only detect toxins but can also learn to associate odors with both the taste of toxins and the postingestive consequences of consuming them. We found that two distinct monoaminergic pathways mediate learned food aversions in the honeybee. As for other insect species conditioned with salt or...
Tipo: Journal Article Palavras-chave: INSECTE; INSECTE UTILE; ALIMENTATION; TOXINE; APPRENTISSAGE; MEMOIRE; ODEUR; OLFACTION; DOPAMINE; SEROTONINE; SYSTME NERVEUX; ABEILLE DOMESTIQUE .
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201034c88ffd&uri=/notices/prodinra1/2011/05/
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