Efeito antigonadotrópico da Ecdisona e sua inibição pelo hormônio juvenil em fêmeas de Rhodnius prolixus Stal, 1859 (Hemiptera, Reduviidae, Triatominae)

Abstract

Oviposition and oogenesis can be inhibited in Rhodnius prolixus female by ecdysone given by oral route. The inhibition is dose-dependent, and doses higher than 4,0 ng ecdysone/mg body wheight, drastically reduces the size of the ovaries. In ecdysone-treated insects normal oviposition and oogenesis can be reestablished by the subsequent blood meal without ecdysone. When the insect receives 0,1 µg of juvenile hormone, immediately after the administration of ecdysone, the inhibitory effect of this hormone can not be noted. This results show that ecdysone in Rhodnius prolixus, acts as a antigonadotropic factor and this action mecanism can be reverted by juvenile hormone.