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Symbionts in the oocytes of blattella germanica l. dictyoptera blattellidae their mode of transmission


International Journal of Insect Morphology and Embryology 17(6): 437-446
Symbionts in the oocytes of blattella germanica l. dictyoptera blattellidae their mode of transmission
In Blattodea, the transmission of symbionts from one generation to the next is of transovarial type. The symbionts in Blattella germanica (L.) (Dictyoptera : Blattellidae) reach the ovary inside bacteriocytes in the 5-day-old nymphal instar, and are located among the ovarioles. Between the 11th and 17th day, the symbionts leave the bacteriocytes, cross the ovariole sheath, the tunica propria, and the follicular epithelium, and reach the space between the latter and the oocyte. In 17-day-old nymphs, the symbionts are in contact with the microvilli of the oocyte, remaining in this position until the end of the vitellogenic phase, when the microvillar border is progressively reduced. At this stage, the symbionts are actively phagocytosed by the oocyte before chorion formation.


Accession: 007851906

DOI: 10.1016/0020-7322(88)90023-2



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