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Mol Microbiol. 2009 Nov;74(3):662-71. doi: 10.1111/j.1365-2958.2009.06888.x. Epub 2009 Oct 8.

Bacterial chemoattraction towards jasmonate plays a role in the entry of Dickeya dadantii through wounded tissues.

Author information

1
Centro de Biotecnología y Genómica de Plantas (CBGP), Departamento de Biotecnología. E. T. S. Ingenieros Agrónomos. Universidad Politécnica de Madrid, 28040 Madrid, Spain.

Erratum in

  • Mol Microbiol. 2009 Dec;74(6):1543. Prichard, Leighton [corrected to Pritchard, Leighton].

Abstract

Jasmonate is a key signalling compound in plant defence that is synthesized in wounded tissues. In this work, we have found that this molecule is also a strong chemoattractant for the phythopathogenic bacteria Dickeya dadantii (ex-Erwinia chysanthemi). Jasmonic acid induced the expression of a subset of bacterial genes possibly involved in virulence/survival in the plant apoplast and bacterial cells pre-treated with jasmonate showed increased virulence in chicory and Saintpaulia leaves. We also showed that tissue wounding induced bacterial spread through the leaf surface. Moreover, the jasmonate-deficient aos1 Arabidopsis thaliana mutant was more resistant to bacterial invasion by D. dadantii than wild-type plants. These results are consistent with the hypothesis that sensing jasmonic acid by this bacterium helps the pathogen to ingress inside plant tissues.

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