Homoserine lactones influence the reaction of plants to rhizobia

Bacterial quorum sensing molecules not only grant the communication within bacterial communities, but also influence eukaryotic hosts. N-acyl-homoserine lactones (AHLs) produced by pathogenic or beneficial bacteria were shown to induce diverse reactions in animals and plants. In plants, the reaction...

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Published in:International journal of molecular sciences 2013-08, Vol.14 (8), p.17122-17146
Main Authors: Zarkani, Azhar A, Stein, Elke, Röhrich, Christian R, Schikora, Marek, Evguenieva-Hackenberg, Elena, Degenkolb, Thomas, Vilcinskas, Andreas, Klug, Gabriele, Kogel, Karl-Heinz, Schikora, Adam
Format: Article
Language:English
Subjects:
Acyl-Butyrolactones - metabolism
Arabidopsis - growth & development
Arabidopsis - metabolism
Arabidopsis - microbiology
Arabidopsis thaliana
Bacteria
Communication
Disease Resistance
Electronic mail systems
Fabaceae
homoserine lactones
Host-Pathogen Interactions
induced resistance
Lipids
Molecular biology
Pathogens
Plant Diseases - microbiology
Plant resistance
Plant Roots - growth & development
Plant Roots - metabolism
Plant Roots - microbiology
plant-bacteria interaction
Pseudomonas syringae - physiology
Quorum Sensing
Rhizobium - physiology
Rhizobium etli
Sinorhizobium - physiology
Sinorhizobium meliloti
Symbiosis
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Summary:Bacterial quorum sensing molecules not only grant the communication within bacterial communities, but also influence eukaryotic hosts. N-acyl-homoserine lactones (AHLs) produced by pathogenic or beneficial bacteria were shown to induce diverse reactions in animals and plants. In plants, the reaction to AHLs depends on the length of the lipid side chain. Here we investigated the impact of two bacteria on Arabidopsis thaliana, which usually enter a close symbiosis with plants from the Fabaceae (legumes) family and produce a long-chain AHL (Sinorhizobium meliloti) or a short-chain AHL (Rhizobium etli). We demonstrate that, similarly to the reaction to pure AHL molecules, the impact, which the inoculation with rhizosphere bacteria has on plants, depends on the type of the produced AHL. The inoculation with oxo-C14-HSL-producing S. meliloti strains enhanced plant resistance towards pathogenic bacteria, whereas the inoculation with an AttM lactonase-expressing S. meliloti strain did not. Inoculation with the oxo-C8-HSL-producing R. etli had no impact on the resistance, which is in agreement with our previous hypothesis. In addition, plants seem to influence the availability of AHLs in the rhizosphere. Taken together, this report provides new insights in the role of N-acyl-homoserine lactones in the inter-kingdom communication at the root surface.
ISSN:1422-0067
1661-6596
1422-0067
DOI:10.3390/ijms140817122