, Volume 41, Issue 9, pp 1165–1167 | Cite as

Regulation of juvenile hormone titer in African locust

  • F. Couillaud
  • B. Mauchamp
  • A. Girardie
Short Communications


In the African locust, the titer of C-16 JH in hemolymph (determined by GC-MS), reflects the rate of hormone biosynthesis (determined by RCA) in normal adult females. Severance of the nervi corporis allati-I (NCA-I) results in a low C-16 JH biosynthesis without affecting physiological events dependent on JH. In NCA-I-transectioned animals, JH titer is higher than in control locusts. JH catabolism does not seem to be involved in this high titer of hormone associated with a very low rate of JH production. In sham-operated females, the bulk of injected [3H]C-16 JH quickly disappeared from the hemolymph but JH was retained in the bloodless body. After severance of the NCA-I, the remaining radiolabeled JH in the hemolymph increased. These results suggest the role of tissue JH-binding or of JH excretion in regulating its level in the locust.

Key words

Juvenile hormone biosynthesis catabolism tissue binding titer disconnected copora allata, locust 


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Copyright information

© Birkhäuser Verlag 1985

Authors and Affiliations

  • F. Couillaud
    • 1
    • 2
  • B. Mauchamp
    • 1
    • 2
  • A. Girardie
    • 1
    • 2
  1. 1.Laboratoire de Neuroendocrinologie, UA CNRS 683Université de Bordeaux ITalence Cedex(France)
  2. 2.Laboratoire de PhytopharmacieINRAVersailles(France)

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