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Reproductive growth in normal allatectomized median neuro secretory cell cauterized and ovariectomized females of melanoplus sanguinipes



Reproductive growth in normal allatectomized median neuro secretory cell cauterized and ovariectomized females of melanoplus sanguinipes



Canadian Journal of Zoology 54(2): 162-171



Changes in the weight of the whole insect, fat body and ovary during successive gonotrophic cycles were measured. The effects of ovariectomy, cautery of the median neurosecretory cells (mNSC) or removal of the corpora allata (CA) on the development of the fat body and reproductive system were observed. After an initial period of somatic growth, changes in body weight are largely due to growth of the proximal oocytes and to oviposition. Yolk deposition begins when the oocytes are 1.0 mm long and occurs most rapidly during the final stages of their development. Vitellogenesis begins in the penultimate oocytes when the proximal oocytes are 3.0-3.5 mm long. Ovariectomy results in a significant increase in fat body weight. Allatectomy prevents oocyte development beyond the 1- mm stage and production of secretion in the lateral oviducts. Both effects can be reversed by treating operated insects with juvenile hormone. Cautery of the mNSC, provided it is carried out within 3 h of emergence, also inhibits oocyte growth and delays the appearance of secretion in the lateral oviducts.

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Accession: 006316941

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