Document Detail

Influence of the parasitoid Chelonus inanitus and its polydnavirus on host nutritional physiology and implications for parasitoid development.
MedLine Citation:
PMID:  16203013     Owner:  NLM     Status:  MEDLINE    
Chelonus inanitus is a solitary egg-larval endoparasitoid, which feeds on host haemolymph during its internal phase. Parasitization induces in the host Spodoptera littoralis a precocious onset of metamorphosis and a developmental arrest in the prepupal stage. At this stage the parasitoid larva emerges from the host and consumes it. We show here that parasitization and the co-injected polydnaviruses affect the nutritional physiology of the host mainly in the last larval instar. Polydnaviruses cause a reduced uptake of food and an increase in the concentration of free sugars in the haemolymph and of glycogen in whole body. The parasitoid larva, along with polydnaviruses, causes a reduction of proteins in the host's plasma and an accumulation of lipids in whole body. Dilution of host haemolymph led to a reduced concentration of lipid in parasitoid larvae and a reduced survival rate. Thus, a sufficient concentration of nutrients in the host's haemolymph appears to be crucial for successful parasitoid development. Altogether, the data show that the parasitoid and the polydnavirus differentially influence host nutritional physiology and that the accumulated lipids and glycogen are taken up by the parasitoid in its haematophagous stage as well as through the subsequent external host feeding.
Martha Kaeslin; Rita Pfister-Wilhelm; Beatrice Lanzrein
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-10-03
Journal Detail:
Title:  Journal of insect physiology     Volume:  51     ISSN:  0022-1910     ISO Abbreviation:  J. Insect Physiol.     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2005-11-18     Completed Date:  2006-06-22     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  2985080R     Medline TA:  J Insect Physiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1330-9     Citation Subset:  IM    
Institute of Cell Biology, University of Berne, Switzerland.
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MeSH Terms
Animal Nutritional Physiological Phenomena*
Blood Proteins
Eating / physiology
Electrophoresis, Gel, Two-Dimensional
Glycogen / metabolism
Hemolymph / chemistry*
Host-Parasite Interactions / physiology
Larva / parasitology,  physiology
Lipids / analysis
Spodoptera / parasitology*,  physiology
Wasps / growth & development*,  virology*
Reg. No./Substance:
0/Blood Proteins; 0/Lipids; 9005-79-2/Glycogen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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