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  • Artikel: DFG Deutsche Nationallizenzen  (11)
  • electroantennogram  (11)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Entomologia experimentalis et applicata 52 (1989), S. 191-203 
    ISSN: 1570-7458
    Schlagwort(e): Green leaf volatiles ; green odor ; green receptor ; pheromone ; synergist ; plant odor ; Anthonomus grandis ; boll weevil ; electroantennogram ; single cell ; behavior ; host plant
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Beschreibung / Inhaltsverzeichnis: Résumé Pour la première fois, l'augmentation de la puissance de la phéromone d'agrégation sous l'action de l'odeur verte est signalée chez A. grandis. Les enregistrements unitaires de cellules des récepteurs olfactifs des antennes a mis en évidence une catégorie de cellules réagissant sélectivement aux alcools et aux aldéhydes à 6 carbones (c'est-à-dire aux substances volatiles des feuilles vertes). Des essais dans la nature ont montré une augmentation des captures par les pièges de grandlure (phéromone d'agrégation du charançon) renforcés par du trans-2-hexen-l-ol, du cis-3-hexen-l-ol, ou du l-hexanol. Bien que les courbes des réponses en fonction des doses construites à partir des électroantennogrammes indiquent des catégories de cellules réceptrices identiques pour les alcools à 6 carbones examinés, l'une de ces substances, cis-2-hexen-l-ol, s'est révélée inactive dans la nature. Le trans-2-hexenal qui était actif avec des enregistrements unitaires de cellules, était lui aussi inactif dans la nature. Dans des essais dans des champs de coton avec des populations indigènes de charançons, le trans-2-hexen-l-ol a, non seulement augmenté l'efficacité des pièges à phéromone, mais a prolongé leur attractivité. Les résultats d'électrophysiologie combinés aux données de la nature appuient le modelage transversal des substances vertes volatiles des feuilles par les récepteurs olfactifs du charançon. Ces résultats sont interprétés en relation avec la chimie de la plante-hôte de A. grandis, le coton, Gossypium hirsutum L., et leur possibilité d'utilisation économique pour l'éradication du charançon.
    Notizen: Abstract Enhancement of an insect pheromone response by green leaf volatiles is reported for the first time in the boll weevil, Anthonomus grandis Boh. (Coleoptera: Curculionidae). Single cell recordings from antennal olfactory receptors revealed a class of cells selectively responsive to six carbon alcohols and aldehydes (i.e., ‘green leaf volatiles’). Field tests with released weevils demonstrated enhanced trap captures with trans-2-hexen-l-ol, cis-3-hexen-l-ol, or l-hexanol paired with grandlure, the boll weevil aggregation pheromone, when in competition with grandlure alone. Although dose-response curves constructed from electroantennograms were indicative of similar populations of receptor cells for selected six carbon alcohols, one of the compounds tested, cis-2-hexen-l-ol, was inactive in field tests. Trans-2-hexenal was active in single cell recordings, but was also inactive in field tests. In tests in cotton fields with indigenous weevil populations, trans-2-hexen-l-ol not only enhanced pheromone trap captures, but also extended the longevity of attractiveness of pheromone-baited traps. The combined electrophysiological and field data support ‘across-fiber coding’ of green leaf volatiles by boll weevil olfactory receptors. The results are discussed with regard to the chemistry of the host plant of the boll weevil, cotton (Gossypium hirsutum L.), and potential economic significance for boll weevil eradication/suppression.
    Materialart: Digitale Medien
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  • 2
    ISSN: 1573-1561
    Schlagwort(e): Pheromone ; analog ; parapheromone ; behavior ; neurobiology ; olfaction ; single neuron ; electroantennogram ; boll weevil ; Anthonomus grandis ; Coleoptera ; Curculionidae
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Competitive field tests with α-fluorinated analogs of compounds III and IV (III-α-F and IV-α-F, respectively) of the boll weevil,Anthonomus grandis Boh., aggregation pheromone showed these compounds, when combined with the other pheromone components [(±)-I and II], to be as attractive as grandlure [(+)-I, II, and III+IV]. Dose-response curves constructed from electroantennograms of male boll weevils to serial stimulus loads of III, IV, III-α-F, IV-α-F, and the corresponding acyl fluorinated analogs (III-acyl-F and IV-acyl-F) showed the α-fiuorinated analogs to be as active as the pheromone components (threshold=0.1 μg), while the acyl fluorinated analogs had a 10-100 x higher threshold (=1-10 μg). Single-neuron recordings showed that IV neurons and II neurons (Dickens, 1990) responded to IV-α-F and III-α-F, respectively, while IV-acyl-F and III-acyl-F were inactive. Since a previous study showed compounds I, II, and IV to be essential for behavioral responses in the field, it seems likely that the activity of the α-fluorinated analogs observed here is due to the stimulation of IV neurons by IV-α-F as indicated in single neuron recordings.
    Materialart: Digitale Medien
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  • 3
    ISSN: 1573-1561
    Schlagwort(e): Lygus lineolaris ; olfaction ; pheromone ; host odor ; electroantennogram ; EAG ; butyrates ; green odor ; host finding ; sex attraction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Olfactory reception of potential pheromones and host-plant odors by male and female tarnished plant bugs (TPBs),Lygus lineolaris (Hemiptera: Miridae), was investigated by utilizing electroantennogram (EAG) techniques. In general, EAGs were similar between the sexes. Among 31 compounds of seven chemical groups tested, insect-produced butyrates and host-plant-containing green leaf volatiles (GLVs) were the most active. Hexyl butyrate and (E)-2-hexenyl butyrate elicited greater EAGs in males than in females. Females responded with significantly greater EAGs to alcohol and aldehyde GLVs than to their acetate derivatives. Among GLVs, sexual dimorphism was also observed in response to (E)-2-hexenol and (E)-2-hexenal. Females were more sensitive to the monoterpene geraniol than were males. While nonanal was the most stimulatory compound tested, no sexual differences in EAGs to this compound were observed. These studies reveal olfactory receptors on TPB antennae responsive to insect and host-plant volatiles that are likely to play a role in host finding and sexual attraction.
    Materialart: Digitale Medien
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  • 4
    ISSN: 1573-1561
    Schlagwort(e): Green leaf volatile ; olfaction ; reception ; inactivation ; electroantennogram ; fluorinated analogs ; Spodoptera exigua ; Leptinotarsa decemlineata ; Schistocerca gregaria ; insect ; Lepidoptera ; Noctuidae ; Coleoptera ; Chrysomelidae ; Orthoptera ; Acrididae
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The role of the alkyl terminus of green leaf volatile (GLV) molecules in olfactory reception and inactivation was examined in three diverse insect species: the beet armyworm,Spodoptera exigua (Lepidoptera); the Colorado potato beetle,Leptinotarsa decemlineata (Coleoptera); and the desert locust,Schistocerca gregaria (Orthoptera), using selectively fluorinated analogs of GLVs and electroantennograms (EAGs). When only the magnitude of the depolarization of the EAG is considered (a measure of reception), the order of effectiveness was 1-hexanol (6:OH)=(Z)-3-6:OH 〉 5,5,6,6,6-pentafluoro-(Z)-3-6:OH =5,5-difluoro-(Z)-3-6:OH ≫ 5,5,6,6,6-pentafluoro-6: OH. Percent recovery of the EAG (a measure of inactivation) was greater for the pentafluoro-(Z)-3-6: OH analog than for the difluoro-(Z)-3-6: OH analog. Our results show that the alkyl end of GLV molecules plays an important role not only in reception, but also inactivation processes in insect olfaction. Furthermore, specificities of these two processes may differ.
    Materialart: Digitale Medien
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  • 5
    ISSN: 1573-1561
    Schlagwort(e): Boll weevil ; olfaction ; receptor cell ; Anthonomus grandis ; Coleoptera ; Curculionidae ; enantiomer ; grandisol ; chirality ; electroantennogram ; aggregation pheromone ; neurobiology ; structure-activity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Electrophysiological recordings from antennal olfactory receptors and field behavioral experiments showed both male and female boll weevils,Anthonomus grandis Boh. (Coleoptera: Curculionidae), to respond specifically to (+)-grandisol, an enantiomer of compound I of the boll weevil aggregation pheromone. Single-cell recordings revealed antennal olfactory neurons in both male and female weevils keyed to (+)-grandisol. Electroantennograms in response to serial dilutions of the grandisol enaniiomers showed a threshold 100 to 1000 times lower for (+)-grandisol relative to its antipode. In field behavioral experiments, both sexes were significantly more attracted to (+)-grandisol in combination with the three other pheromone components than the combination with (−)-grandisol. When (−)-grandisol was placed with the (+)-enantiomer at equal dosages, a slight although statistically insignificant inhibition occurred. Subsequent field tests showed that the low level of attraction exhibited by (−)-grandisol in combination with the other three pheromone components could be attributed to the other three components alone. These results are in contrast with an earlier study, which found (−)-grandisol to be as attractive as the (+)-enantiomer.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Journal of chemical ecology 24 (1998), S. 965-984 
    ISSN: 1573-1561
    Schlagwort(e): Pheromone ; plant volatile ; olfactory receptors ; electroantennogram ; predators ; Podisus maculiventris ; Podisus nigrispinus ; insect
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Electroantennograms (EAGs) were recorded from both sexes of spined soldier bug (SSB), Podisus maculiventris, and Brazilian SSB (BSSB), P. nigrispinus to determine antennal olfactory responsiveness of 23 compounds in SSB and 14 compounds in BSSB, including the multicomponent male-produced aggregation pheromone and plant volatiles. EAGs of both species were similar. (E)-2-Hexenol and (E)-2-hexenal elicited the greatest EAGs, followed by heptanol, nonanal, hexanal, and the pheromonal compounds, (±)-α-terpineol and benzyl alcohol. Both sexes of SSB and BSSB were more sensitive to components of the male-produced aggregation pheromone [(±)-α-terpineol, (±)-linalool, and benzyl alcohol] and nonanal than either (E)-2-hexenol or (E)-2-hexenal (a component of the aggregation pheromone). BSSB were more sensitive to (±)-α-terpineol, (±)-linalool, benzyl alcohol, and nonanal than were SSB. EAGs to the plant volatile 1-hexanol and the pheromonal components (E)-2-hexenal and (±)-α-terpineol decreased significantly with removal of antennal segments, suggesting that receptors for these compounds are distributed over the distal three segments of the five-segmented antennae.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Journal of chemical ecology 10 (1984), S. 1759-1785 
    ISSN: 1573-1561
    Schlagwort(e): Cotton boll weevil ; Anthonomus grandis ; Coleoptera ; Curculionidae ; pheromone ; kairomone ; plant odor ; olfaction ; electroantennogram ; attractant ; host plant ; green leaf volatiles
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Electroantennogram (EAG) techniques were utilized to measure the antennal olfactory responsiveness of adult boll weevils,Anthonomus grandis Boh. (Coleoptera: Curculionidae), to 38 odorants, including both insect and host plant (Gossypium hirsutum L.) volatiles. EAGs of both sexes were indicative of at least two receptor populations: one receptor population primarily responsive to pheromone components and related compounds, the other receptor population primarily responsive to plant odors. Similar responses to male aggregation pheromone components (i.e., compounds I, II, and III + IV) were obtained from both sexes, but females were slightly more sensitive to I. Both sexes were highly responsive to components of the “green leaf volatile complex,” especially the six-carbon saturated and monounsaturated primary alcohols. Heptanal was the most active aldehyde tested. More acceptors responded to oxygenated monoterpenes than to monoterpene hydrocarbons. β-Bisabolol, the major volatile of cotton, was the most active sesquiterpene. In general, males, which are responsible for host selection and pheromone production, were more sensitive to plant odors than were females. In fact, males were as sensitive to β-bisabolol and heptanal as to aggregation pheromone components. Electrophysiological data are discussed with regard to the role of insect and host plant volatiles in host selection and aggregation behavior of the boll weevil.
    Materialart: Digitale Medien
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  • 8
    ISSN: 1573-1561
    Schlagwort(e): Boll weevil ; Anthonomus grandis ; aggregation pheromone ; multicomponent ; behavior ; electroantennogram ; neurobiology ; structureactivity ; geometric isomers ; cotton ; Coleoptera ; Curculionidae
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract For two decades, the aggregation pheromone of the boll weevil,Anthonomus grandis Boh. (Coleoptera: Curculionidae), was thought to consist of four compounds: I [(+)-(Z)-2-isopropenyl-1-methylcyclobutane ethanol]; II [(Z)-3,3-dimethyl-ΔI,β-cyclohexane ethanol]; III [(Z)-3,3-dimethyl-Δ1,α-cyclohexane acetaldehyde); and IV [(E)-3,3-dimethyl-Δ1,α-cyclohexane acetaldehyde). Evidence is presented from behavioral and electrophysiological studies to show that only three of these components, I, II, and IV, are essential for attraction. Competitive field tests, in which each possible three-component blend was tested against the four-component mixture, demonstrated that omission of I, II. or IV resulted in decreased trap captures (P 〈 0.01). Trap captures by these blends lacking I, II, or IV resembled those by the hexane solvent alone in a similar experiment. However, omission of III did not significantly alter field attractiveness of the blend. Dosage-response curves constructed from electroantennogram responses of both males and females to serial dilutions of III, IV, and a 50∶50 mixture of the geometric isomers III and IV showed both sexes to be 10- to 100-fold more sensitive to IV than III. Data from the electrophysiological studies were consistent with a single acceptor type for the (E)-cyclohexylidene aldehyde, IV, for males, and possibly one or two acceptor types for III and IV for females. Possible roles for the (Z)-cyclohexylidene aldehyde, III, and implications for the pheromonal attractant currently used in boll weevil eradication/suppression programs are discussed.
    Materialart: Digitale Medien
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  • 9
    ISSN: 1573-1561
    Schlagwort(e): Ceratitis capitata ; medfly ; Diptera ; Tephritidae ; trimedlure ; electroantennogram ; dosage-response
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Electroantennograms (EAGs) of unmated laboratory-reared male and femaleCeratitis capitata (Wiedemann) were recorded in response to the attractant trimedlure [tert-butyl 4(and 5)-chloro-trans-2-methylcyclohexane-1-carboxylate] and its fourtrans isomers. For both sexes, the magnitude of the EAG response was relatively low as compared to other previously tested compounds (i.e., plant volatiles). Dosage-response curves generated for all TML isomers revealed that flies responded to increasing dosages over a relatively narrow range (two to three log steps). Responses for both sexes peaked at ca. 10 μg dose for all isomers. Antennal response in males was greatest to the C isomer followed by the B1, A, and B2 isomers, while responses of females were greatest for the A isomer followed by B1, C, and B2. Both sexes exhibited a long recovery period for the response potential to return to baseline at doses above 1 μg for all of the isomers tested, except for B2. The low EAG sensitivity to trimedlure and the apparent EAG selectivity to the C isomer in males are discussed in relation to the known field attractancy of males to the C, A, B1, and B2 isomers.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Journal of chemical ecology 11 (1985), S. 767-779 
    ISSN: 1573-1561
    Schlagwort(e): Host plant ; biological control of weeds ; Trirhabda bacharides ; Coleoptera ; Chrysomelidae ; Compositae ; Baccharis ; green leaf volatiles ; plant odor ; electroantennogram ; olfaction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Electroantennograms (EAGs) were recorded fromTrirhabda bacharides Le Conte (Coleoptera: Chrysomelidae) females to 28 odorants and volatiles emanating from leaves of 26 plant species including three known host plants,Baccharis halimifolia L.,B. neglecta Britt, andB. salicina T. & G. (Compositae: Asterae). Antennal receptors were highly responsive to components of the green leaf volatile complex, especially 6-carbon saturated and monounsaturated alcohols andtrans-2-hexenal. EAGs elicited by heptanal were greater than those elicited by any other saturated aldehyde. Oxygenated monoterpenes were more active than monoterpene hydrocarbons. β-Bisabolol was the most active sesquiterpene. In general, EAGs to volatiles emanating fromBaccharis and other composite species were greater than those elicited by species from other families. Furthermore, when one considers only plants occurring in the environs ofT bacharides hostB. neglecta, EAGs elicited by its host plant were at least two times greater than those elicited by other coinhabiting plants.
    Materialart: Digitale Medien
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