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Gewählte Publikation:

Schafellner, C; Marktl, RC; Nussbaumer, C; Schopf, A; .
(2004): Parasitism-induced effects of Glyptapanteles liparidis (Hym., Braconidae) on the juvenile hormone titer of its host, Lymantria dispar: the role of the parasitoid larvae.
J Insect Physiol. 2004; 50(12):1181-1189 FullText FullText_BOKU

Abstract:
Parasitization by the gregarious larval endoparasitoid Glyptapantles liparidis induces a dramatic increase in the hemolymph juvenile hormone (JH) titer (especially JH III) of its host larva, Lymantria dispar. Here, we investigated the role of the parasitoid larvae in JH synthesis and release by in vitro and in vivo experiments. GG-MS analyses confirmed that the rising hemolymph JH titer coincided with the time at which the parasitoids molt to the second larval instar. Peak values in host hentolymph titers were observed prior to parasitoid emergence, and titers dropped to negligible,levels within 24h after parasitoid emergence. Whole body extracts from excised second instar parasitoids yielded JH III and trace amounts of JH II. The in vitro secretory activity of the corpora allata (CA) of L. dispar larvae was not enhanced by parasitization. When the host's CA were separated by neck ligation, we found elevated JH III titers, but no JH 11 in the hemolymph of the posterior section, which contained the parasiioids. Parasitoids that were kept in in vitro culture produced and released only JH III. The parasitoids' ability to secrete JH and to molt independently from their host's molting cycles indicates that at least. second instar parasitoids are hormonally self-reliant. (C) 2004 Elsevier Ltd. All rights reserved.
Autor*innen der BOKU Wien:
Schafellner Christa
Schopf Axel
Find related publications in this database (using NML MeSH Indexing)
Animals;Corpora Allata/metabolism;Female;Gas Chromatography-Mass Spectrometry;Hemolymph/metabolism;Host-Parasite Interactions;Juvenile Hormones/metabolism*;Male;Moths/metabolism*;Moths/parasitology*;Wasps/metabolism*;

Find related publications in this database (Keywords)
juvenile hormone
Lymantria dispar
glyptapanteles liparidis
host-parasitoid interactions
parasitism
Braconidae


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