Abstract
Juvenile hormone (JH) synthesized and secreted in vitro by the corpora allata of mated adult Leucophaea maderae females was determined to be JH III (methyl-10,11-epoxy-3,7,11-trimethyl-2,6-dodecadienoate). The haemolymph titre of JH was determined during maturation of the terminal oöcytes in the first reproductive cycle of L. maderae. In virgin females, JH is not detectable in the haemolymph during the first eight days following adult emergence; however, by 10 days after emergence, trace quantities of JH are apparent. Mating stimuli induce a dramatic increase in the concentration of haemolymph JH, with a peak occurring approximately 12 days after mating; thereafter, the JH concentration declines until it has reached an undetectable level 19 days after mating, at the time of chorion deposition. During ovarian maturation, changes in the rates of synthesis of vitellogenin by the fat body and DNA by the ovary correlate closely with the haemolymph titre of JH. However, no such correlation exists between the JH titre and the extensive ovarian protein synthesis that occurs in L. maderae coincident with chorion formation. The effects of JH I and JH III on both vitellogenin synthesis and ovarain DNA synthesis are statistically similar.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.