Abstract
Using an in vitro radiochemical assay, juvenile hormone (JH) synthesis has been monitored after denervation under conditions of unilateral allatectomy and implantation of super-numerary corpora allata (CA) of Diploptera punctata into hosts of the same and different ages. The results demonstrate that (1) the gonotrophic cycle can be accelerated by denervating the CA or implanting supernumerary CA, (2) denervation of the CA at the start of the gonotrophic cycle results in a normal but accelerated cycle of JH synthesis, (3) a single CA can double its JH synthetic rate even when denervated, and (4) CA compensate for the addition of supernumerary CA but the degree of compensation depends upon the innervation of host glands and upon the age of the implanted glands with respect to that of the host. We conclude that there is negative feedback control over the CA and that it is affected in part by neural inhibition which takes precedence over humoral stimulation. The humorally mediated inactivation of glands at the end of the gonotrophic cycle is independent of gland age.
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