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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
Jean-Claude Tourneur
Affiliation:
Département des sciences biologiques, Université du Québec à Montréal, C.P. 8888, Succursale Centre-ville, Montréal, Québec, Canada H3C 3P8
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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
Information
The Canadian Entomologist , Volume 131 , Issue 3 , June 1999 , pp. 335 - 345
Copyright
Copyright © Entomological Society of Canada 1999

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