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Incorporation of Tritiated Thymidine in the Wing and Leg Disks of Calliphora Erythrocephala Meigen

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

1. The localization of tritiated thymidine incorporation in the wing and leg disks of Calliphora erythrocephala Meigen during the third larval instar and the prepupal period was described. During development, fluctuations in the DNA synthesis were found within the various compartments of the disks. There exists a 3HTdR incorporation gradient from proximal to distal parts in the wing and leg disks. 2. No distinct relation was found between the pattern of DNA synthesis and the pattern of 5-'nucleotidase activity. 3. The in vitro effects of ecdysterone on DNA synthesis in the imaginal disks were investigated. Ecdysterone may stimulate, inhibit or is not effective in DNA synthesis depending on the developmental stage. The most significant stimulation is found when the endogenous level of ecdysterone is low; this is the case in the middle of the third larval instar. The inverse relation, a high natural ecdysterone level and an inhibition of DNA synthesis, was found only in the last few hours before the prepupal period. 4. It has been proposed that the ratio ecdysterone/juvenile hormone during development plays a role in regulating proliferation.

Affiliations: 1: Zoological Laboratory, University of Leiden, The Metherlands


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