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JXB Advance Access published online on June 25, 2008
Journal of Experimental Botany, doi:10.1093/jxb/ern163
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© The Author [2008]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

Investigations into plant biochemical wound-response pathways involved in the production of aphid-induced plant volatiles

Robbie D. Girling1,*, Rachael Madison2, Mark Hassall1, Guy M. Poppy3 and John G. Turner2

1School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK
2School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, UK
3School of Biological Sciences, University of Southampton, Southampton SO16 7PX, UK

* Present address and to whom correspondence should be sent. Natural Resources Institute, University of Greenwich at Medway, Chatham, Kent ME4 4TB, UK. E-mail: robbie_girling{at}hotmail.com

Feeding damage to plants by insect herbivores induces the production of plant volatiles, which are attractive to the herbivores natural enemies. Little is understood about the plant biochemical pathways involved in aphid-induced plant volatile production. The aphid parasitoid Diaeretiella rapae can detect and respond to aphid-induced volatiles produced by Arabidopsis thaliana. When given experience of those volatiles, it can learn those cues and can therefore be used as a novel biosensor to detect them. The pathways involved in aphid-induced volatile production were investigated by comparing the responses of D. rapae to volatiles from a number of different transgenic mutants of A. thaliana, mutated in their octadecanoid, ethylene or salicylic acid wound-response pathways and also from wild-type plants. Plants were either undamaged or infested by the peach-potato aphid, Myzus persicae. It is demonstrated that the octadecanoid pathway and specifically the COI1 gene are required for aphid-induced volatile production. The presence of salicylic acid is also involved in volatile production. Using this model system, in combination with A. thaliana plants with single point gene mutations, has potential for the precise dissection of biochemical pathways involved in the production of aphid-induced volatiles.

Key words: cev-1, coi1-16, Col-gl, NahG, npr-1, semiochemical, tritrophic interaction, Y-tube olfactometer

Received 17 March 2008; Revised 27 April 2008 Accepted 12 May 2008


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