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Article Dans Une Revue New Phytologist Année : 2012

Biological control of bacterial wilt in Arabidopsis thaliana involves abscissic acid signalling

Résumé

Means to control bacterial wilt caused by the phytopathogenic root bacteria Ralstonia solanacearum are limited. Mutants in a large cluster of genes (hrp) involved in the pathogenicity of R similar to solanacearum were successfully used in a previous study as endophytic biocontrol agents in challenge inoculation experiments on tomato. However, the molecular mechanisms controlling this resistance remained unknown. We developed a protection assay using Arabidopsis thaliana as a model plant and analyzed the events underlying the biological control by genetic, transcriptomic and molecular approaches. High protection rates associated with a significant decrease in the multiplication of R similar to solanacearum were observed in plants pre-inoculated with a similar to hrpB mutant strain. Neither salicylic acid, nor jasmonic acid/ethylene played a role in the establishment of this resistance. Microarray analysis showed that 26% of the up-regulated genes in protected plants are involved in the biosynthesis and signalling of abscissic acid (ABA). In addition 21% of these genes are constitutively expressed in the irregular xylem cellulose synthase mutants (irx), which present a high level of resistance to R similar to solanacearum. We propose that inoculation with the ?hrpB mutant strain generates a hostile environment for subsequent plant colonization by a virulent strain of R similar to solanacearum.

Dates et versions

hal-02650167 , version 1 (29-05-2020)

Identifiants

Citer

Dong Xin Feng, Celine Tasset, Mathieu Hanemian, Xavier X. Barlet, Jian Hu, et al.. Biological control of bacterial wilt in Arabidopsis thaliana involves abscissic acid signalling. New Phytologist, 2012, 194 (4), pp.1035 - 1045. ⟨10.1111/j.1469-8137.2012.04113.x⟩. ⟨hal-02650167⟩
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