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Incidences de températures élevées appliquées au cours du stade pupal sur les potentialités reproductrices des adultes de Drosophila melanogaster (1974)

Laugé, Ginette ; Masner, Peter

Springer

Entomologia experimentalis et applicata 17 (1974), S. 511-521

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ISSN: 1570-7458

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Description / Table of Contents: Summary After an exposure of pupae to 30° or 32°C during 1 to 4 days before emergence, adults were divided in two groups. Flies maintained at high temperatures (Go). At 30°, adults gave rise to imaginal G1 progeny only if pupal exposure was shorter than 48 hours. At 32°, there was no imaginal G1 progeny; but one knows that complete development is not possible at 32°. Flies transferred to 25° immediately after emergence (G'o). The rate of reproduction was always lower than that of the controls. Moreover: at each experimental temperature, a longer pupal exposure resulted in a lower rate of reproduction and a longer time of recovery; for each duration of each pupal exposure, the rate of reproduction was the lowest after treatment at 32°. When this treatment was applied during 4 days, the G'o adults never gave rise to progeny. These experiments were done with two strains: Oregon and Bar. The results showed that Bar is the more sensitive.

Notes: Résumé Après un séjour des pupes à température élevée (30 ou 32°C) allant de 1 à jours avant l'émergence, les adultes qui apparaissent sont répartis en deux groupes: Adultes maintenus à température élevée (Go). À 30°, il y a une descendance imaginale G1 tant que le séjour des pupes à cette température n'excède pas 48 heures. À 32°, les adultes Go ne donnent jamais de descendance imaginale G1; mais on sait que tout développement complet est impossible à cette température. Adultes ramenés à 25° dès l'émergence (G'o). Le taux de reproduction est toujours inférieur à celui des témoins. De plus: - pour chacune des températures de traitement, le taux de reproduction est d'autant plus faible et le délai de restauration plus important que le séjour des pupes à haute température a été plus long; - pour une durée de traitement donnée, les taux de reproduction sont les plus bas lorsque les pupes ont été soumises à 32°. Après un séjour de 4 jours à cette température, les imagos G'o obtenus ne donnent jamais de descendance. Ces expériences intéressent deux souches: Oregon et Bar. Plusieurs faits dénotent que la souche Bar est la plus thermosensible.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00338463

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Rôles présumés de la membrane embryonnaire d’un parasite ovo-larvaire dePyralidae phanerotoma flavitestace [Hym.: Braconidae] (1979)

Hawlitzky, Nicole ; Laugé, Ginette

Springer

BioControl 24 (1979), S. 247-253

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ISSN: 1573-8248

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Description / Table of Contents: Summary After the hatching of the parasitic larva,Phanerotoma flavitestacea Fisch., the embryonic membrane persists around it during three days and a half. The different hypothetical roles of this membrane are discussed. Three are retained, on the base of our biological and physiological observations interesting this larva or different authors’ observations concerning other entomophagous insects. These roles are alimentary and protective functions for the parasite and action on the host physiology.

Notes: Résumé Après l’éclosion de la larve du parasitePhanerotoma flavitestacea Fisch., la membrane embryonnaire persiste pendant 3,5 jours. Différents rôles de cette membrane sont envisagés et discutés. Trois d’entre eux sont retenus (alimentation et protection de la larve parasite et action sur le développement ultérieur de l’hôte). Ce choix est basé sur nos propres observations biologiques et physiologiques et celles de divers auteurs concernant d’autres insectes entomophages.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02374238

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Ultrastructural study of the relations between Leptomonas oncopelti (Noguchi and Tilden), protozoa trypanosomatidae, and the rectal wall of adults of Oncopeltus fasciatus dallas, hemiptera lygaeidae (1977)

Laugé, Ginette ; Nishioka, Richard S.

New York, NY : Wiley-Blackwell

Journal of Morphology 154 (1977), S. 291-305

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Notes: A laboratory colony of Oncopeltus fasciatus was found to be infected by Leptomonas oncopelti. The flagellates form a carpet attached to the cuticular intima of the rectal glands of adult bugs. The epithelial cells of these glands are characterized by infolded apical plasma membranes associated with mitochondria; the overlying cuticular intima shows endocuticular canals. The Leptomonas are attached by hemidesmosomes, located most often at the tip of the flagella. The Protozoa multiply by budding and the resultant straphangers cling to the parental flagellum. Adhesion of the flagellates to the cuticular lining is so strong that detaching flagellates carry with them the outer part of the epicuticle. Epicuticle repair presumably occurs through the endocuticular canals.

Additional Material: 1 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jmor.1051540207

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