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.
Publication types
-
Research Support, Non-U.S. Gov't
MeSH terms
-
Arabidopsis / genetics
-
Arabidopsis / metabolism
-
Bacterial Proteins / genetics
-
Bacterial Proteins / metabolism
-
Carbon-Sulfur Lyases / genetics
-
Carbon-Sulfur Lyases / metabolism
-
Chemotaxis / drug effects*
-
Cichorium intybus / genetics
-
Cichorium intybus / metabolism
-
Cichorium intybus / microbiology
-
Cyclopentanes / pharmacology*
-
Enterobacteriaceae / genetics
-
Enterobacteriaceae / pathogenicity
-
Enterobacteriaceae / physiology*
-
Gene Expression Regulation, Bacterial
-
Gene Regulatory Networks
-
Genes, Bacterial
-
Genome, Bacterial
-
Iron-Sulfur Proteins / genetics
-
Iron-Sulfur Proteins / metabolism
-
Magnoliopsida / genetics
-
Magnoliopsida / metabolism
-
Mutation
-
Oxylipins / pharmacology*
-
Plant Diseases / genetics
-
Plant Diseases / microbiology
-
Plant Leaves / genetics
-
Plant Leaves / metabolism
-
Plant Leaves / microbiology
-
Plants / genetics
-
Plants / metabolism
-
RNA, Bacterial / genetics
-
Repressor Proteins / genetics
-
Repressor Proteins / metabolism
-
Signal Transduction / genetics
-
Virulence / genetics
-
Virulence Factors / genetics
Substances
-
Bacterial Proteins
-
Cyclopentanes
-
Iron-Sulfur Proteins
-
Oxylipins
-
RNA, Bacterial
-
Repressor Proteins
-
Virulence Factors
-
jasmonic acid
-
Carbon-Sulfur Lyases