Factors influencing the juvenile hormone metabolism in Lymantria dispar larvae (Lep., Lymantriidae) parasitized by the Braconid Wasp Glyptapanteles liparidis (Hym., Braconidae).
Abstract
Larvae of Lymantria dispar, parasitized by the endoparasitic wasp Glyptapanteles liparidis, show disruption of their development during their final host instar. From our previous studies we know that increased titers of juvenile hormones (JH) are involved in these changes resulting in developmental arrest and prevention of metamorphosis. Increased JH titers in parasitized larvae are caused at least in part by suppression of activity of juvenile hormone esterase (JHE), the enzyme responsible for degradation of JH in the hemolymph of L. dispar. Because of this crucial role of JHE in regulating the JH titer, the project focuses on the effects of parasitism on the expression and activity of this enzyme. During oviposition different associated factors such as venom, calyx fluid including polydnaviruses and also parasitoid eggs which release teratocytes (cells deriving from the serosa of the hatched parasitoid egg) are inserted into the host¿s body. One aim of the project is to determine which of these components reduce activity of JHE. The second aim of the project is to determine the level on which suppression of JHE occurs. Thus, it is investigated whether parasitism interferes with the expression of the protein on the level of transcription or translation/posttranslation. Furthermore, a possible uptake into pericardial cells or an uptake by teratocytes resulting in a lower concentration of JHE in the hemolymph of parasitized larvae is examined.
keywords Lymantria dispar host-parasitoid interaction juvenile hormone metabolism glyptapanteles liparidis juvenile hormone esterase
Publikationen
Veränderung der Wirtsqualität von Lymantria dispar Larven für die endoparasitische Entwicklung der Braconide Glyptapanteles liparidis durch eine Mikrosporidieninfektion.
Autoren: Hoch, G; Schafellner, C; Henn, M W; Maddox, J V; Schopf, A Jahr: 2001
Journal articles
Interspecific competition between the braconid endoparasitoids Glyptapanteles porthetriae and Glyptapanteles liparidis in Lymantria dispar larvae
Autoren: Marktl, R.C., Stauffer, C., Schopf, A. Jahr: 2002
Journal articles
Project staff
Axel Schopf
Univ.-Prof. i.R. Dr.phil. Axel Schopf
axel.schopf@boku.ac.at
Project Leader
01.01.2000 - 31.12.2001
Christa Schafellner
Priv.-Doz. Dr.phil. Christa Schafellner
christa.schafellner@boku.ac.at
Tel: +43 1 47654-91619
Project Staff
01.01.2000 - 31.12.2001
BOKU partners
External partners
University of California, Department of Entomology and Environment Toxicology
none
partner