Abstract
The appearance of giant HnRNA in the epidermal cells of Calliphora in the transition period from larva to pupa is ecdysone-dependent. In this specific stage of development, the initial increase of this RNA species occurs shortly after the appearance of a small peak of ecdysone. Another main peak of the hormone is a prerequisite for pupation. The removal of the ring gland, the source of ecdysone, prior to the appearance of the second peak of the hormone, was found to have no pronounced effect on HnRNA synthesis for at least 48 h after the operation. It is concluded that the larval pupal differentiation is a two-step process. Initially a gen activation occurs dependent on a low ecdysone titer. This is followed by a second final step of pupal cuticle synthesis and pupation, dependent on the presence of a high concentration of the hormone.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Hoppe-Seyler´s Zeitschrift für physiologische Chemie
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.
