The onset of metamorphosis in Tenebrio molitor L.: Effects of a juvenile hormone analogue and of 20-hydroxyecdysone |
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Authors: | JL Connat JP Delbecque J Delachambre |
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Institution: | Laboratoire de Zoologie, Faculté des Sciences, Boulevard Gabriel, 21100 Dijon, France (Equipe de Recherche Associée au CNRS No 231) |
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Abstract: | Sensitivity to juvenile hormone and to 20-hydroxyecdysone has been investigated during the last-larval stages of Tenebrio molitor. Topical applications of a juvenile hormone analogue (K-421d) showed that the sensitive period, occurring before apolysis, is relatively short (less than 4 days in a 3-week instar) and divided into two phases. Treatment during the first and longest phase induced a delay in development and then an increase in larval moult percentage. Treatment during the second phase induced several abnormal moults (prothetelic larvae and larval-pupal intermediates).Injections of massive doses of 20-hydroxyecdysone (10 μg per animal) also evidenced a period of disturbance of the morphogenetic programme, beginning before pupal apolysis but continuing several days after.Comparison of the sensitive periods to both hormones suggests that a very important and rapid step of the larval-pupal programme change is controlled hormonally just before pupal apolysis. |
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Keywords: | Ecdysteroids juvenile hormone analogue metamophosis reprogramming |
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