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POLYPLOIDY AND PREVITELLOGENIC FOLLICULAR ATRESIA DURING OOGENESIS IN THE EUROPEAN EARWIG FORFICULA AURICULARIA (DERMAPTERA: FORFICULIDAE)

Published online by Cambridge University Press:  31 May 2012

Jean-Claude Tourneur
Affiliation:
Département des sciences biologiques, Université du Québec à Montréal, C.P. 8888, Succursale Centre-ville, Montréal, Québec, Canada H3C 3P8

Abstract

Growth, number of fusions, and polyploidy of ovarian trophocytes were studied in the European earwig, Forficula auricularia L., from the imaginal moult to oviposition, by examining sections of ovarioles and whole mounts of ovaries. During a reproductive cycle, the nucleus of the basal trophocyte enlarges its mean diameter from 5 to 170 ± 33 μm, successively absorbing the trophocyte nuclei of both adjacent follicles and undergoing seven endoreplications. The nucleus thus increased its DNA content 192 times, which is 66.7% more than in the artioploid type of polyploidy. However, vitellogenesis lasted about three times longer than previtellogenesis. This type of polyploidy accelerates oogenesis, allows an earlier oviposition, and may constitute an adaptation specific for the Montréal population of earwigs.

Résumé

Chez le Forficule commun Forficula auricularia L., la croissance, le nombre de fusions et la polyploïdie des trophocytes ont été établis de la mue imaginale à la ponte, en observant des coupes histologiques d’ovarioles et des ovaires montés in toto. Au cours d’un cycle reproducteur, il est établi que le diamètre nucléaire du trophocyte basal passe de 5 à 170 ± 33 μm, tout en absorbant successivement le noyau des trophocytes de deux follicules adjacents et en effectuant sept endoréplications. Le noyau augmente ainsi de 192 fois son contenu en AND, soit 66,7% de plus que le type de ploïdie artioploïdique. Malgré cela, la vitellogenèse requiert environ trois fois plus de temps que la prévitellogenèse. Cette polyploïdie permet une ovogenèse plus rapide, une ponte plus hâtive et pourrait constituer une adaptation spécifique de la population de Montréal.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1999

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References

Arnold, W.J. 1957. The histology of the vitellarium of the seaside Earwig, Anisolabis maritima (Géné). M.Sc. thesis, University of California, BerkeleyGoogle Scholar
Bier, K. 1957. Endomitose und Plytänie in den Näjrzellkernen von Calliphora erythrocephala. Chromosoma 8: 493522CrossRefGoogle ScholarPubMed
Bonhag, P.F. 1956. The origin and distribution of periodic acid- Schiff-positive substances in the oocyte of the earwig, Anisolabis maritima (Géné). Journal of Morphology 99: 433–63CrossRefGoogle Scholar
Büning, J. 1979. The trophic tissues of telotrophic ovarioles in polyphage Coleoptera. Zoomorphologie 93: 3350CrossRefGoogle Scholar
Büning, J. 1994. The insect ovary. Ultrastructure, previtellogenic growth and evolution. Chapman and Hall, New YorkGoogle Scholar
Cardoen, J., Schoofs, L., Broekaert, D., Van Mallaert, H., Erachtert, B., De Loof, A. 1986. Polyploidization and localisation of poly (A)+RNA in the different cell types of the vitellogenic meroistic ovary of the fleshfly, Sarcophaga bullata. Histochemistry 85: 305–12CrossRefGoogle ScholarPubMed
Cardoen, J., Wastson, C., De Loof, A., Berry, S.J. 1990. Polyploidy in the nuclei ovarian nurse and follicle cells of the silk moth, Hyalophora cecropia. Archives of Insect Biochemistry and Physiology 15: 93100CrossRefGoogle Scholar
Engels, W. 1969. Geschwindigkeit des RNS-Transports im Einährverband der Dermapteren im Vergleich mit anderen Insekten meroistischen ovartyps. Verhandlungen Deutsche Zoologishe Gesellschaft 33: 3039Google Scholar
Hould, R. 1984. Techniques d'histopathologie et de cytopathologie. Décarie éditeur, MontréalGoogle Scholar
King, R.C., Büning, J. 1985. The origin and functioning of insect oocytes and nurse cells. pp. 3782in Kerkut, G.A., Gilbert, L.I. (Eds.), Comprehensive insect physiology, biochemistry and pharmacology. Vol. 1. Pergamon Press, OxfordGoogle Scholar
Lender, T.h., Delavault, R., Le Moigne, A. 1994. Dictionnaire de biologie. Presses Universitaires de France, ParisGoogle Scholar
Matuszewski, B. 1968. Regulation of growth of Nurse nuclei in the development of egg follicles in Cecidomyiidae (Diptera). Chromosoma 25: 429–69CrossRefGoogle ScholarPubMed
Raccaud-Schoeller, J. 1980. Les insectes. Physiologie, développement. Masson, ParisGoogle Scholar
Tourneur, J-C. 1999. Oogenesis in the adult of the European earwig Forficula auricularia (Dermaptera: Forficulidae). The Canadian Entomologist 131: 323–34CrossRefGoogle Scholar
Tourneur, J-C, Gingras, J. 1992. Egg laying in a northeastern North American (Montréal, Québec) population of Forficula auricularia L. (Dermaptera: Forficulidae). The Canadian Entomologist 124: 1055–61CrossRefGoogle Scholar
Yamauchi, H., Yoskitake, N. 1982. Origin and differentiation of the oocyte-nurse complex in the germarium of the earwig, Anisolabis maritima Borelli (Dermaptera: Labiduridae). Journal of Insect Morphology and Embryology 11: 293305CrossRefGoogle Scholar