Mediation of pathogen resistance by exudation of antimicrobials from roots

Harsh P. Bais, Balakrishnan Prithiviraj, Ajay K. Jha, Frederick M. Ausubel () and Jorge M. Vivanco ()
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Harsh P. Bais: Colorado State University
Balakrishnan Prithiviraj: Colorado State University
Ajay K. Jha: Colorado State University
Frederick M. Ausubel: Massachusetts General Hospital
Jorge M. Vivanco: Colorado State University

Nature, 2005, vol. 434, issue 7030, 217-221

Abstract: Abstract Most plant species are resistant to most potential pathogens. It is not known why most plant–microbe interactions do not lead to disease, although recent work indicates that this basic disease resistance is multi-factorial1,2. Here we show that the exudation of root-derived antimicrobial metabolites by Arabidopsis thaliana confers tissue-specific resistance to a wide range of bacterial pathogens. However, a Pseudomonas syringae strain that is both at least partly resistant to these compounds and capable of blocking their synthesis/exudation is able to infect the roots and cause disease. We also show that the ability of this P. syringae strain to block antimicrobial exudation is dependent on the type III secretory system.

Date: 2005
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DOI: 10.1038/nature03356

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