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  • Lepidoptera  (3)
  • Rice leaffolder  (2)
  • plant volatiles  (2)
  • Amphotericin B  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Modulation of phototactic behavior of first-instar larvae of rice leaffolder by plant factors (1991)
    Springer
    Entomologia experimentalis et applicata 58 (1991), S. 149-157 
    Details
    ISSN: 1570-7458
    Schlagwort(e): Rice leaffolder ; Cnaphalocrocis medinalis ; orientation ; movement ; phototaxis ; plant factors ; rice volatiles
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Beschreibung / Inhaltsverzeichnis: Résumé Au laboratoire et en plein champ, avec la lumière venant d'en haut, les larves du premier stade de la pyrale du riz C. medinalis s'orientent vers le bars lorsqu'elles se trouvent sur une feuille de riz tenue verticale, et elles s'orientent vers le haut lorsqu'elles sont sur du papier filtre. La direction d'orientation sur les deux substrat s'inverse lorsque la lumière provient du bas. Ces différences d'orientation par rapport à la source de lumière, sur la feuille de riz et sur le papier filtre, se maintiennent même lorsque le substrat est horizontal. Lorsque l'expérience est effectuée dans l'obscurité, l'intensité de la réaction d'orientation vers le haut sur du papier filtre tenu verticalement se réduit, et l'orientation vers le bas sur la feuille de riz disparaît. Sur des substrats horizontaux (feuille de riz et papier filtre), les larves ne s'orientent pas dans l'obscurité. On n'observe pas de différence dans le comportement d'orientation entre des larves issues d'œufs pondus sur des plants de riz ou sur des substrats non végétaux, ou entre des larves exposées aux substances volatiles du riz ou à de l'air pur. Le comportement d'orientation des larves du premier stade sur des variétés de riz susceptibles ou résistantes est similaire, mais sur des graminées non-hôtes on n'observe pas d'orientation significative vers le haut ou vers le bas. En traitant les feuilles de riz avec de l'hexane pour enlever les cires de surface, on réduit l'intensité de la réaction d'orientation; cependant, l'application de cires de surface sur du papier filtre ne modifie pas significativement le comportement des larves. Sur une feuille de riz séchée, l'orientation est similaire à celle observée sur papier filtre, mais est d'une intensité plus faible. Les substances volatiles du riz extraites par distillation à la vapeur et appliquées sur une feuille de riz séchée causent une perte d'orientation à 500 pm, tandis que leur application sur du papier filtre cause une décroissance dose-dépendante de l'intensité de l'orientation vers le haut. Ces résultats indiquent que les larves du premier stade de C. medinalis sont positivement phototactiques et que des substance volatiles et d'autres substances jusqu'ici non identifiées et présentes dans les plants de riz causent une inversion ans la phototaxie, ce qui résulte en une orientation vers le bas sur les feuilles de riz.
    Notizen: Abstract First-instar larvae of the rice leaffolder Cnaphalocrocis medinalis (Guenńe) oriented upwards on a vertically inclined filter paper and downwards on a rice leaf when the light source was from above. The direction of orientation was reversed when the light source was from below. The opposite directions of orientation on these substrates persisted when the substrates were held horizontal with light source from the sides. No difference was observed in the magnitude of reaction on susceptible and resistant rice varieties or when the rice leaf was held with its distal end pointing down. On non-host grasses, however, the directional orientation was lost. Dipping rice leaves in hexane decreased the magnitude of reaction. On dried rice leaf, the reaction was similar to that on filter paper but was of a lower magnitude. Application of rice plant volatile extracts on a filter paper decreased the intensity of upward orientation while 500 ppm of the volatile extracts applied on dried leaf caused a loss of oriented movement. Application of a mixture of seven volatile chemicals, identified from rice, decreased the magnitude of reaction significantly. It is concluded that rice plant volatiles along with some other hitherto unidentified rice plant factor cause a reversal of phototaxis, leading to downward orientation on the rice leaf.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00164939
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Feeding site selection of first-instar larvae of Cnaphalocrocis medinalis on susceptible and resistant rice plants (1991)
    Springer
    Entomologia experimentalis et applicata 60 (1991), S. 43-49 
    Details
    ISSN: 1570-7458
    Schlagwort(e): Rice leaffolder ; neonate larval ; feeding site ; movement ; whorl leaf ; mature leaf ; resistance ; varieties
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract More first-instar larvae of the rice leaffolder, Cnaphalocrocis medinalis (Guenée), were recovered from susceptible IR36 and Roxoro rice varieties than resistant TKM6 and Oryza perennis, 24 h after infestation. Within a rice plant, a higher proportion of larvae was recovered from young whorl leaf, followed by mature leaves and leafsheaths on all the four rice varieties tested. However, differences were observed between susceptible and resistant varieties in the distribution of larvae on these three plant parts. In laboratory choice tests, first-instar larvae preferred to settle on the young leaves of IR36 and TKM6 when presented with their respective mature leaves. No such preference was observed in tests with Rexoro and O. perennis. Larval survival was similar on young and mature leaves of Rexoro. Young leaves of IR36 and TKM6 were more suitable for survival in comparison with their respective mature leaves while the reverse was true for O. perennis. Larval movement was slower on the mature leaves and larvae took longer to reach the whorl leaf of TKM6 than on IR36. The density of trichomes of the abaxial surface of TKM6 was higher than that of the other varieties tested. Adaptive significance of feeding in the leafwhorl to young larvae is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00164958
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Role of trichomes in soybean resistance to cabbage looper, Trichoplusia ni (1986)
    Springer
    Entomologia experimentalis et applicata 42 (1986), S. 109-117 
    Details
    ISSN: 1570-7458
    Schlagwort(e): cabbage looper ; Trichoplusia ni ; Glycine max ; soybeans ; trichomes ; plant resistance ; Noctuidae ; Lepidoptera
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Beschreibung / Inhaltsverzeichnis: Résumé L'influence de la densité et de la longueur des trichomes de Glycine max sur la résistance à Trichoplusia ni a été évaluée suivant la position des feuilles sur une lignée résistante (‘PI 227687’) et sur un cultivar sensible (‘Davis’). Les feuilles apicales (juvéniles) tant de PI 227687 que de Davis, recouvertes de trichomes denses, résistèrent mieux à l'alimentation larvaire et à la survie de T. ni. Quand ces trichomes étaient éliminés, ces feuilles ne résistaient pas plus à l'alimentation des larves de T. ni que les feuilles non rasées TL3 et TL5 de PI 227687 ou toutes les autres feuilles de Davis. Les tests avec des extraits dans l'acétate d'éthyle et l'hexane de feuilles provenant de différentes positions de PI 227687 et Davis, destinés à mettre en évidence des phagodissuadants, ont montré que la résistance observée chez les feuilles apicales de Davis était attribuable aux trichomes (c'est-à-dire à un caractère morphologique), tandis que chez les mêmes feuilles de PI 227687 elle impliquait à la fois des trichomes (morphologie) et des substances chimiques, mais avec une prédominance de l'influence des trichomes.
    Notizen: Abstract Role of leaf trichome density and length in Glycine max (L.) Merr. resistance to Trichoplusia ni (Hübner) was evaluated at different leaf positions on a relatively resistant soybean, plant introduction (PI) 227687, and a relatively susceptible cultivar, ‘Davis’. The uppermost (juvenile) leaf within both PI 227687 and ‘Davis’ plants, which is densely covered with trichomes, was most resistant to T. ni larval feeding and survival. When these trichomes were shaven off, such leaves became as susceptible to T. ni larval feeding as unshaven TL3 and TL5 leaves (PI 227687) or all other unshaven leaves (‘Davis’). Bioassays for antifeedants in ethyl acetate and hexane extractables from leaves at the different positions on PI 227687 and ‘Davis’ plants showed that the resistance observed in the uppermost ‘Davis’ leaf is attributable to trichomes (i.e., a morphological factor); whereas, in the uppermost PI 227687 leaf it involves both morphological (trichomes) and chemical factors, but the trichome parameter is dominant.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00343536
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Epididymal histoplasmosis diagnosed by isolation ofHistoplasma capsulatum from semen (1995)
    Springer
    Mycopathologia 131 (1995), S. 173-177 
    Details
    ISSN: 1573-0832
    Schlagwort(e): Amphotericin B ; Epididymal histoplasmosis ; Histoplasma capsulatum ; Semen culture
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract An autochthonous case of epididymal histoplasmosis masquerading as tuberculosis in a 55-year-old male patient is reported from India. It was diagnosed by culture ofHistoplasma capsulatum from semen and by demonstration of the fungus upon re-examination of epididymal biopsy sections previously misinterpreted as tuberculous granuloma. The patient's main complaints were painful epididymal swelling, occasional fever and cough. He was treated successfully by excision of epididymis and vas deferens combined with amphotericin B therapy. This is believed to be the first case of epididymal histoplasmosis to be reported outside the American continent and the fourth of its type reported in the English literature. The case is also noteworthy in thatH. capsulatum was isolated for the first time from semen, and it underlines the importance of mycological culture of semen specimens for diagnosis of genitourinary infections of obscure etiology.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01102897
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Olfactory sensitivity of two sympatric species of rice leaf folders (Lepidoptera: Pyralidae) to plant volatiles (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 2647-2666 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Cnaphalocrocis medinalis ; electroantennogram ; green leaf volatiles ; host-plant resistance ; Lepidoptera ; Marasmia patnalis ; olfaction ; plant volatiles ; Pyralidae ; rice leaf folder
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Electroantennograms (EAGs) were recorded from male and female moths of two sympatric leaf folder species,Cnaphalocrocis medinalis (Gue-née) andMarasmia patnalis Bradley (Lepidoptera: Pyralidae) to 91 volatile chemicals of plant origin. Responses of both leaf folder species were similar to all compounds except to three monoterpenes-β-myrcene, menthone, and isomenthone- and two sesquiterpenes-cis-nerolidol and isophytol. Response ofM. patnalis, an oligophagous leaf folder, to these compounds was higher compared with that of polyphagousC. medinalis. EAG responses of males to saturated and unsaturated aliphatic aldehydes were significantly higher than those of conspecific females in both species. A higher response ofC. medinalis males also was observed for 1-nonanol, 3-nonen-2-one, andtrans, trans-2,6-dimethyl-2,4,6-octatriene. In contrast, females of both species responded more to monoterpenes, borneol, isoborneol, and fenchyl alchohol. Response ofC. medinalis female was higher for terpinen-4-ol, carveol, dihydrocarveol, (−)-myrtenal, and perillaldehyde. In both species and sexes, high EAG responses were recorded for compounds of the green leaf odor complex. EAG responses to nonanal and hexanal were maximum among the aliphatic aldehydes while 1-hexanol elicited the highest response among the alcohols tested. EAG responses to terpene compounds-citronellal,α-terpineol, and (−)-myrtenal-were equal to the response to 1-hexanol. While all compounds tested elicited a negative potential, thymol and carvacrol elicited a positive EAG potential. The EAG data are discussed with regard
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00988076
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Behavioral and physiological responses of cabbage looper,Trichoplusia ni (Hübner), to steam distillates from resistant versus susceptible soybean plants (1987)
    Springer
    Journal of chemical ecology 13 (1987), S. 1903-1915 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Allelochemicals ; cabbage looper ; Glycine max ; Lepidoptera ; Noctuidae ; plant resistance ; plant volatiles ; soybeans ; steam distillates ; Trichoplusia ni
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Soybean plant volatiles, extracted as steam distillates, significantly affected the behavior and biology of the cabbage looper,Trichoplusia ni (Hübner) (Lepidoptera: Noctuidae). Distillates from the susceptible Davis variety attractedT. ni larvae and female adults, whereas those from resistant PI 227687 plants repelled them. When mixed in an artificial diet, steam distillates from PI 227687 plants caused mortality of first-instar larvae. Adults emerging from pupae topically treated with 5 μg of such PI 227687 extractable showed developmental abnormalities. Larval feeding was significantly less on Davis leaves treated with PI 227687 volatiles as compared to solvent (acetone) or such Davis extractables. However, Davis volatiles on PI 227687 leaves did not increase larval feeding. HPLC analyses of steam distillates from susceptible Davis versus resistant PI 227687 indicated differences.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01013239
    Standort Signatur Erwartet Verfügbarkeit
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