Quorum-sensing effects in the antagonistic rhizosphere bacterium Serratia plymuthica HRO-C48

Henry Müller, C. Westendorf, Erich Leitner, L. Chernin, K. Riedel, Stephan Schmidt, L. Eberl, Gabriele Berg

Research output: Contribution to journalArticlepeer-review

Abstract

The rhizosphere-associated bacterium Serratia plymuthica HRO-C48 is not only able to suppress symptoms caused by soil-borne pathogens but is also able to stimulate growth of plants. Detailed knowledge about the underlying mechanisms and regulation are crucial for the application in biocontrol strategies. To analyse the influence of N-acyl homoserine lactone (AHL)-mediated communication on the biocontrol activity, the AHL-degrading lactonase AiiA was heterologously expressed in the strain, resulting in abolished AHL production. The comparative analysis of the wild type and AHL negative mutants led to the identification of new AHL-regulated phenotypes. In the pathosystem Verticillium dahliae–oilseed rape, the essential role of AHL-mediated signaling for disease suppression was demonstrated. In vitro, the regulatory function of AHLs in the synthesis of the plant growth hormone indole-3-acetic acid …
Original languageEnglish
Pages (from-to)468-478
JournalFEMS Microbiology Ecology
Volume67
Issue number3
DOIs
Publication statusPublished - 1 May 2009

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)

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