Abstract
In the adult female of Locusta migratoria, the transformation of juvenile genital ducts into functional organs has been studied at the ultrastructural level. Ultrastructural characters are similar all along the genital duct except for vacuoles of Golgi origin, which are found only in pseudocolleterial gland cells. Allatectomy stops ergastoplasm development and Golgi multiplication, and therefore no secretion products appear in the lumen. Even when ablation is carried out as late as day 6 after ecdysis, the genital ducts cannot develop in the absence of juvenile hormone. The epithelium remains in a juvenile physiological state, except for a few cells which show figures of degeneration, especially in the nuclei. Implantation of corpora allata, 1–3 months after allatectomy, allows the oviducts and their glands to complete their development within 48 hrs and to reach functional maturity: this differentiation takes place more quickly than in a normal maturation.
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