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    • DNA synthesis in the imaginal wing discs of the American bollwormHelicoverpa armigera (Hübner)

      A Josephrajkumar B Subrahmanyam

      Volume 27 Issue 2 March 2002 pp 113-120

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jbsc/027/02/0113-0120

    • Keywords

       

      Azadirachtin; Helicoverpa armigera ; 20-hydroxyecdysone; imaginal wing discs; plumbagin

    • Abstract

       

      The effect of two insect growth regulators of plant origin viz. plumbagin and azadirachtin and the ecdysteroids 20-hydroxyecdysone, makisterone A and a phytoecdysteroid on DNA synthesis in imaginal wing discs of day 4 final instarHelicoverpa armigera larvae was studied. DNA synthesis increased with increase in time of incubation up to 8 h and decreased later without the addition of moulting hormone. Addition of 20-hydroxyecdysone supported long term acquisition of competence for DNA synthesis in the wing discs. Both DNA synthesis and protein content were drastically reduced in plumbagin and azadirachtin-treated insects. Underin vitro conditions, plumbagin had a more pronounced inhibitory effect than azadirachtin. All the ecdysteroids tested, viz. makisterone A, 20-hydroxyecdysone and the ecdysteroidal fraction from the silver fernCheilanthes farinosa enhanced DNA synthesis

    • Author Affiliations

       

      A Josephrajkumar1 2 B Subrahmanyam1

      1. Division of Entomology, Indian Agricultural Research Institute, New Delhi - 110 012, India
      2. Cardamom Research Station, Pampadumpara - 685 556, India

    • Dates

       
      Published
      March 2002
      Manuscript received
      11 April 2001
      Accepted
      10 January 2002

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