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INCORPORATION OF TRITIATED THYMIDINE IN THE WING AND LEG DISKS OF CALLIPHORA ERYTHROCEPHALA MEIGEN SHORT TERM EFFECT OF ECDYSTERONE ON DNA SYNTHESIS DURING LARVAL AND PREPUPAL DEVELOPMENT by A. J. VIJVERBERG (Zoological Laboratory, University of Leiden, The Netherlands) I. INTRODUCTION The incorporation of tritiated thymidine (3HTdR) by imaginal disk cells has been used as a parameter of DNA synthesis and consequently of cellular proliferation (cf. OBERLANDER, 1972), since the disk cells do not become polyploid or polytene (WILDERMUTH, 1968; BAUTZ, 1971; FRISTROM, 1972; VIJVERBERG, unpublished results). DNA synthesis in imaginal disk cells has been investigated by several authors (KRISHNAKUMARAN et al., 1967; WILDERMUTH, 1968; HIROSA & KaJI, 1969; L6BBECKE, 1969; OBERLANDER, 1969 a, b, 1972b; CHIN- zEI & Tojo, 1972). KRISHNAKUMARAN et al. ( 1967) put forward that for Ricini larvae (Lepidoptera) it is tempting to conclude that cyclic DNA synthesis is caused by the cyclic release of ecdysone and that tissues which do not show cyclic DNA synthesis (e.g., muscles and imaginal disks) 190 either do not depend on ecdysone or are sensitive to low titres of ecdy- sone. They also argued that the primary effect of ecdysone cannot be the stimulation of DNA synthesis, not even
Netherlands Journal of Zoology (in 2003 continued as Animal Biology) – Brill
Published: Jan 1, 1972
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