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Response of Arabidopsis Thaliana to N-hexanoyl-DL-homoserine-lactone, a Bacterial Quorum Sensing Molecule Produced in the Rhizosphere

Response of Arabidopsis Thaliana to N-hexanoyl-DL-homoserine-lactone, a Bacterial Quorum Sensing Molecule Produced in the Rhizosphere

Uta von Rad, Ilona Klein, Petre I Dobrev, Jana Kottova, Eva Zazimalova, Agnes Fekete, Anton Hartmann, Philippe Schmitt-Kopplin, Jörg Durner

Planta. 2008 Dec;229(1):73-85.

PMID: 18766372

Abstract:

The bacterial quorum sensing signals N-acyl-L: -homoserine lactones enable bacterial cells to regulate gene expression depending on population density, in order to undertake collective actions such as the infection of host cells. Only little is known about the molecular ways of plants reacting to these bacterial signals. In this study we show that the contact of Arabidopsis thaliana roots with N-hexanoyl-DL: -homoserine-lactone (C6-HSL) resulted in distinct transcriptional changes in roots and shoots, respectively. Interestingly, unlike most other bacterial signals, C6-HSL influenced only a few defense-related transcripts. Instead, several genes associated with cell growth as well as genes regulated by growth hormones showed changes in their expression after C6-HSL treatment. C6-HSL did not induce plant systemic resistance against Pseudomonas syringae. The inoculation of roots with different types of AHLs led predominantly for short chain N-butyryl-DL: -homoserine lactone and C6-HSL to root elongation. Determination of plant hormone concentrations in root and shoot tissues supported alterations of auxin to cytokinin ratio. Finally, we provide evidence that Arabidopsis takes up bacterial C6-HSL and allows systemic distribution throughout the plant. In sum, the bacterial quorum sensing signal C6-HSL does induce transcriptional changes in Arabidopsis and may contribute to tuning plant growth to the microbial composition of the rhizosphere.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP76924953	N-(β-Ketocaproyl)-DL-homoserine lactone		76924-95-3	Price

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