SENSITIVITY TO DIPLOPTERA-PUNCTATA ALLATOSTATIN OF MALE CORPORA ALLATA FOLLOWING DENERVATION, JUVENILE-HORMONE ANALOG TREATMENT AND OVARY IMPLANTATION

Allatostatins, brain neuropeptides, of Diploptera punctata inhibit the corpora allata in vitro, and the sensitivity of the corpora allata to allatostatins depends on the developmental state of the glands, This investigation demonstrates changes in rates of juvenile hormone synthe sis and sensitivity of corpora allata of male D. punctata to allatosta tin I (A-P-S-G-A-Q-R-L-Y-G-F-G-L-NH2) in vitro as a result of experime ntal treatments which were shown previously to effect changes in hemol ymph allatostatin, Sensitivity of male glands to allatostatin increase d in the first 8 days of adult life, Severance of nerves to the corpor a allata on day 1 resulted in increased sensitivity of corpora allata by day 5 compared to controls, Treatment of animals with juvenile horm one analog (7S-hydroprene) in addition to severance of nerves shelved an increase in sensitivity to allatostatin by day 3, Implantation of v itellogenic ovarioles into males on day 2, after severance of corpora allata nerves and juvenile hormone analog application on day 1, result ed by day 4 in relatively lower sensitivities of corpora allata to all atostatin than for corpora allata from similarly treated males receivi ng non-vitellogenic ovarioles, These changes in sensitivity of corpora allata to allatostatin in vitro could only in part account for change s in rates of juvenile hormone synthesis observed following experiment al treatments.