Hormonal Control of Vitellogenesis in Argas (Argas) Hermanni (Acari: Argasidae)

摘要

Mated female Argas (Argas) hermanni Audouin synthesize a gonadotropic hormone inthe synganglion within 2 d after feeding. This hormone is then released into the hemolymph. Isolating the ovary from synganglion by legislation during the period of hormone synthesis interfered with oocyte maturation. Injecting an extract of active synganglia or hemolymph from mated fed females into mated, recently fed, ligated females induced oocyte maturation in their ovaries. In the posterior body region of females ligated 1 h after feeding, total proteins, including hemolymph vitellogenins and ovary vitellins, were unchanged during vitellogenesis. The number of protein fractions, their chemical nature, relative mobility, and relative amounts were similar to those found in normal females 1 h after feeding. These findings suggest that the lack of synganglion gonadotropic hormone inhibits vitellogenin synthesis (or its release into the hemolymph), vitellin production, and oocyte maturation. Arachnida; Argas hermanni; Vitellogenins; Vitellogenesis.