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Effects of the corpora allata on sexual receptivity and completion of oocyte development in females of the cricket, Gryllus bimaculatus
Author(s) -
ORSHAN L.,
PENER M. P.
Publication year - 1991
Publication title -
physiological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 57
eISSN - 1365-3032
pISSN - 0307-6962
DOI - 10.1111/j.1365-3032.1991.tb00562.x
Subject(s) - corpus allatum , biology , gryllus bimaculatus , juvenile hormone , methoprene , moulting , receptivity , spermatophore , endocrinology , nymph , medicine , instar , orthoptera , neurohormones , zoology , cricket , hormone , larva , ecology , mating
Allatectomy of young penultimate nymphs of Gryllus bimaculatus De Geer (Gryllidae) resulted in prothetelic creatures which exhibited reproductive competence. The same operation performed on young last instar nymphs resulted in moulting to morphologically normal adults. Allatectomized morphologically normal adult females, as well as prothetelic ones, showed the same level of sexual receptivity as untreated control females. Allatectomized morphologically normal and prothetelic females laid viable eggs, but rate of egg laying and number of eggs produced by these females were much reduced in comparison with the controls. Administration of methoprene (a Juvenile Hormone analogue) to allatectomized females restored egg production to a more or less normal rate. Removal of the spermatophore within 10 min of copulation had no effect on subsequent sexual receptivity of the females, nor on the reduced rate of egg laying by the allatectomized females, but did affect the rate of egg laying by control females. It is suggested that the corpora allata (CA) and the Juvenile Hormone (JH) play no major role in controlling basic sexual receptivity of G.bimaculatus females, and do not have an all‐encompassing control on egg production, though they do exert a marked quantitative effect on the rate of egg production.