Cartieaux Fabienne auteur aut IRD Contesto C. auteur aut IRD Gallou A. auteur aut IRD Desbrosses G. auteur aut IRD Kopka J. auteur aut IRD Taconnat L. auteur aut IRD Renou J. P. auteur aut IRD Touraine B. auteur aut IRD text journalArticle eng text/pdf born digital access Induced systemic resistance (ISR) is a process elicited by telluric microbes, referred to as plant growth-promoting rhizobacteria (PGPR), that protect the host plant against pathogen attacks. ISR has been defined from studies using Pseudomonas strains as the biocontrol agent. Here, we show for the first time that a photosynthetic Bradyrhizobium sp. strain, ORS278, also exhibits the ability to promote ISR in Arabidopsis thaliana, indicating that the ISR effect may be a widespread ability. To investigate the molecular bases of this response, we performed a transcriptome analysis designed to reveal the changes in gene expression induced by the PGPR, the pathogen alone, or by both. The results confirm the priming pattern of ISR described previously, meaning that a set of genes, of which the majority was predicted to be influenced by jasmonic acid or ethylene, was induced upon pathogen attack when plants were previously colonized by PGPR. The analysis and interpretation of transcriptome data revealed that 12-oxo-phytodienoic acid, an intermediate of the jasmonic acid biosynthesis pathway, is likely to be an actor in the signaling cascade involved in ISR. In addition, we show that the PGPR counterbalanced the pathogen-induced changes in expression of a series of genes. specialized 084 21 2 244-259 2008 0894-0282 https://www.documentation.ird.fr/hor/fdi:010042474 10.1094/MPMI-21-2-0244 0894-0282 [F B010042474] https://www.documentation.ird.fr/hor/fdi:010042474 https://www.documentation.ird.fr/intranet/publi/2008/02/010042474.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2008-05-30 2017-08-23 fdi:010042474 fre