Bedoukian   RussellIPM   RussellIPM   Piezoelectric Micro-Sprayer


Home
Animal Taxa
Plant Taxa
Semiochemicals
Floral Compounds
Semiochemical Detail
Semiochemicals & Taxa
Synthesis
Control
Invasive spp.
References

Abstract

Guide

Alphascents
Pherobio
InsectScience
E-Econex
Counterpart-Semiochemicals
Print
Email to a Friend
Kindly Donate for The Pherobase

« Previous AbstractSample integrity evaluation and EPA method 325B interlaboratory comparison for select volatile organic compounds collected diffusively on Carbopack X sorbent tubes    Next Abstract"Oviposition responses to patch quality in the larch ladybird Aphidecta obliterata (Coleoptera: Coccinellidae): effects of aphid density, and con- and heterospecific tracks" »

BMC Biol


Title:Parasitic wasp responses to symbiont-based defense in aphids
Author(s):Oliver KM; Noge K; Huang EM; Campos JM; Becerra JX; Hunter MS;
Address:"Department of Entomology, University of Georgia, Athens, GA 30605, USA. kmoliver@uga.edu"
Journal Title:BMC Biol
Year:2012
Volume:20120224
Issue:
Page Number:11 -
DOI: 10.1186/1741-7007-10-11
ISSN/ISBN:1741-7007 (Electronic) 1741-7007 (Linking)
Abstract:"BACKGROUND: Recent findings indicate that several insect lineages receive protection against particular natural enemies through infection with heritable symbionts, but little is yet known about whether enemies are able to discriminate and respond to symbiont-based defense. The pea aphid, Acyrthosiphon pisum, receives protection against the parasitic wasp, Aphidius ervi, when infected with the bacterial symbiont Hamiltonella defensa and its associated bacteriophage APSE (Acyrthosiphon pisum secondary endosymbiont). Internally developing parasitoid wasps, such as A. ervi, use maternal and embryonic factors to create an environment suitable for developing wasps. If more than one parasitoid egg is deposited into a single aphid host (superparasitism), then additional complements of these factors may contribute to the successful development of the single parasitoid that emerges. RESULTS: We performed experiments to determine if superparasitism is a tactic allowing wasps to overcome symbiont-mediated defense. We found that the deposition of two eggs into symbiont-protected aphids significantly increased rates of successful parasitism relative to singly parasitized aphids. We then conducted behavioral assays to determine whether A. ervi selectively superparasitizes H. defensa-infected aphids. In choice tests, we found that A. ervi tends to deposit a single egg in uninfected aphids, but two or more eggs in H. defensa-infected aphids, indicating that oviposition choices may be largely determined by infection status. Finally, we identified differences in the quantity of the trans-beta-farnesene, the major component of aphid alarm pheromone, between H. defensa-infected and uninfected aphids, which may form the basis for discrimination. CONCLUSIONS: Here we show that the parasitic wasp A. ervi discriminates among symbiont-infected and uninfected aphids, and changes its oviposition behavior in a way that increases the likelihood of overcoming symbiont-based defense. More generally, our results indicate that natural enemies are not passive victims of defensive symbionts, and that an evolutionary arms race between A. pisum and the parasitoid A. ervi may be mediated by a bacterial symbiosis"
Keywords:Animals Aphids/*microbiology/*parasitology/physiology/virology Bacteriophages/genetics/*physiology Enterobacteriaceae/*physiology/virology Gas Chromatography-Mass Spectrometry *Oviposition Pheromones/pharmacology Sesquiterpenes/pharmacology Symbiosis Wasp;
Notes:"MedlineOliver, Kerry M Noge, Koji Huang, Emma M Campos, Jaime M Becerra, Judith X Hunter, Martha S eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. England 2012/03/01 BMC Biol. 2012 Feb 24; 10:11. doi: 10.1186/1741-7007-10-11"

 
Back to top
 
Citation: El-Sayed AM 2024. The Pherobase: Database of Pheromones and Semiochemicals. <http://www.pherobase.com>.
© 2003-2024 The Pherobase - Extensive Database of Pheromones and Semiochemicals. Ashraf M. El-Sayed.
Page created on 26-12-2024