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Science 21 April 2006:
Vol. 312. no. 5772, pp. 436 - 439
DOI: 10.1126/science.1126088
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Reports

A Plant miRNA Contributes to Antibacterial Resistance by Repressing Auxin Signaling

Lionel Navarro,1,2 Patrice Dunoyer,2 Florence Jay,2 Benedict Arnold,3 Nihal Dharmasiri,4 Mark Estelle,4 Olivier Voinnet,2*{dagger} Jonathan D. G. Jones1*{dagger}

Plants and animals activate defenses after perceiving pathogen-associated molecular patterns (PAMPs) such as bacterial flagellin. In Arabidopsis, perception of flagellin increases resistance to the bacterium Pseudomonas syringae, although the molecular mechanisms involved remain elusive. Here, we show that a flagellin-derived peptide induces a plant microRNA (miRNA) that negatively regulates messenger RNAs for the F-box auxin receptors TIR1, AFB2, and AFB3. Repression of auxin signaling restricts P. syringae growth, implicating auxin in disease susceptibility and miRNA-mediated suppression of auxin signaling in resistance.

1 The Sainsbury Laboratory, John Innes Centre, Colney Lane, Norwich NR4 7UH, UK.
2 Institut de Biologie Molèculaire des Plantes du Centre National de la Recherche Scientifique, 67084 Strasbourg Cedex, France.
3 John Innes Centre, Colney Lane, Norwich NR4 7UH, UK.
4 Department of Biology, Indiana University, Bloomington, IN 47405, USA.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: jonathan.jones{at}sainsbury-laboratory.ac.uk (J.D.G.J.); olivier.voinnet{at}ibmp-ulp.u-strasbg.fr (O.V.)

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