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A Plant miRNA Contributes to Antibacterial Resistance by Repressing Auxin Signaling
Lionel Navarro,1,2Patrice Dunoyer,2Florence Jay,2Benedict Arnold,3Nihal Dharmasiri,4Mark Estelle,4Olivier Voinnet,2*Jonathan D. G. Jones1*
Plants and animals activate defenses after perceiving pathogen-associatedmolecular patterns (PAMPs) such as bacterial flagellin. In Arabidopsis,perception of flagellin increases resistance to the bacteriumPseudomonas syringae, although the molecular mechanisms involvedremain elusive. Here, we show that a flagellin-derived peptideinduces a plant microRNA (miRNA) that negatively regulates messengerRNAs for the F-box auxin receptors TIR1, AFB2, and AFB3. Repressionof auxin signaling restricts P. syringae growth, implicatingauxin in disease susceptibility and miRNA-mediated suppressionof 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.
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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147, 1358-1368
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