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  • Title: Replication of Drosophila chromosomes. IX. Stimulation of initiation of polytene replication cycles in vitro by juvenile hormone.
    Author: Sinha P, Lakhotia SC.
    Journal: Cell Differ; 1983 Jan; 12(1):11-7. PubMed ID: 6218890.
    Abstract:
    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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