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JXB Advance Access published online on December 19, 2008
Journal of Experimental Botany, doi:10.1093/jxb/ern306
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© 2008 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

RNA silencing is required for Arabidopsis defence against Verticillium wilt disease

Ursula Ellendorff1,2 *, Emilie F. Fradin1,2 *, Ronnie de Jonge1 * and Bart P. H. J. Thomma1,2,{dagger}

1Laboratory of Phytopathology, Wageningen University, Binnenhaven 5, 6709 PD Wageningen, The Netherlands
2Centre for BioSystems Genomics (CBSG), PO Box 98, 6700 AB Wageningen, The Netherlands

{dagger} To whom correspondence should be addressed: E-mail: bart.thomma{at}wur.nl

RNA silencing is a conserved mechanism in eukaryotes that plays an important role in various biological processes including regulation of gene expression. RNA silencing also plays a role in genome stability and protects plants against invading nucleic acids such as transgenes and viruses. Recently, RNA silencing has been found to play a role in defence against bacterial plant pathogens in Arabidopsis through modulating host defence responses. In this study, it is shown that gene silencing plays a role in plant defence against multicellular microbial pathogens; vascular fungi belonging to the Verticillium genus. Several components of RNA silencing pathways were tested, of which many were found to affect Verticillium defence. Remarkably, no altered defence towards other fungal pathogens that include Alternaria brassicicola, Botrytis cinerea, and Plectosphaerella cucumerina, but also the vascular pathogen Fusarium oxysporum, was recorded. Since the observed differences in Verticillium susceptibility cannot be explained by notable differences in root architecture, it is speculated that the gene silencing mechanisms affect regulation of Verticillium-specific defence responses.

Key words: Abiotic stress, post-transcriptional gene silencing (PTGS), suppressor of gene silencing (SGS), Verticillium dahliae, V. albo-atrum, V. longisporum

* These authors contributed equally to this work.

Received 14 July 2008; Revised 4 November 2008 Accepted 7 November 2008


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