Hormonal control of egg-laying in the marine pulmonate, Onchidium verruculatum

✍ Scribed by R. Nagabhushanam; U.D. Deshpande; M.M. Hanumante

• Book ID: 104614711
• Publisher: Springer
• Year: 1981
• Tongue: English
• Weight: 342 KB
• Volume: 80
• Category: Article
• ISSN: 1573-5141
• DOI: 10.1007/bf00018368

✦ Synopsis

Extirpation of the pleurovisceral ganglia (PV) blocked egg-laying whereas reimplantation of PV or injection of a PV homogenate into PV-less animals restored the egg-laying capacity of the marine pulomonate, 0. verruculatum. Injection of PV homogenate induced egg-laying in intact, mature individuals within 15-45 minutes. Boiling of the homogenate for 15 minutes did not abolish its egg-laying efficacy. However, after incubation with trypsin, a PV homogenate lost its potency. Homogenates of PV from colchicinized animals could not induce egg-laying in intact Onchidium. Similarly, colchicinized animals did not respond to a PV extract from intact Onchidium. It is hypothesized that egg-laying in 0. verruculatum is under the control of a heat-stable, trypsin sensitive hormone secreted by the PV ganglia.