Influence of the Braconid Glyptapanteles liparidis on the Juvenile Hormone Titer of Its Larval Host, the Gypsy Moth, Lymantria dispar

Axel Schopf, Christa Nussbaumer, Heinz Rembold, Bruce D. Hammock

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

The increase in the juvenile hormone (JH) III titer in the hemolymph of Lymantria dispar larvae that were parasitized by the endoparasitoid braconid, Glyptapanteles liparidis, during the host's premolt to third instar, coincided with the molt of the parasitoid larvae to the second instar between day 5 and 7 of the fourth host instar. It reached a maximum mean value of 89 pmol/ml on day 7 of the fifth instar while it remained below 1 pmol/ml in unparasitized larvae. Only newly molted fifth instar hosts showed a low JH III titer similar to that of the unparasitized larvae. JH II, which is the predominant JH homologue in unparasitized gypsy moth larvae, also increased relative to controls in the last two samples (days 7 and 9) from parasitized fourth and fifth instars. Compared to unparasitized larvae, a generally reduced activity of JH esterase (JHE) was found in parasitized larvae throughout both larval stages. The reduction in enzyme activity at the beginning and at the end of each instar, when the JHE activity in unparasitized larvae was high, may be in part responsible for the increased JH II and JH III titers in parasitized larvae. Ester hydrolysis was the only pathway of JH metabolism in the hemolymph of unparasitized and parasitized gypsy moth larvae as detected by chromatographic assays.

Original languageEnglish (US)
Pages (from-to)337-351
Number of pages15
JournalArchives of Insect Biochemistry and Physiology
Volume31
Issue number3
StatePublished - 1996

Keywords

  • Glyptapanteles liparidis
  • Host-parasitoid interaction
  • Juvenile hormone
  • Juvenile hormone esterase
  • Lymantria dispar

ASJC Scopus subject areas

  • Insect Science
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physiology
  • Physiology (medical)

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