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1983Sinha P; Lakhotia S C
Replication of Drosophila chromosomes. IX. Stimulation of initiation of polytene replication cycles in vitro by juvenile hormone.
Cell differentiation 1983;12(1):11-7.
A greater proportion of polytene nuclei show [3H]thymidine incorporation when third instar larval salivary glands of Drosophila nasuta are pulse-labelled after in vitro culture (3-24 h) in the presence of a juvenile hormone mimic, ZR 515. In glands chronically labelled with [3H]thymidine in the presence of ZR 515, more nuclei are seen to have entered new polytene replication cycles. Similarly, when salivary glands from larvae fed on 5-fluorodeoxyuridine to block polytene replication cycles at intersynthetic periods were cultured in vitro, new polytene replication cycles were initiated more quickly in the presence of ZR 515. These results suggest a stimulatory effect of juvenile hormone on new polytene replication cycles.

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