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Several bacterial plant pathogens, including Pectobacterium, use a cell-to-cell communication system called quorum sensing (QS) to synchronize and regulate expression of the virulence factors. In this study, the biomolecule gamma-heptalactone (GHL) was introduced in hydroponic culture of Solanum tuberosum to stimulate growth of the native rhizospheric… (More)
BACKGROUND Several small diffusible molecules are involved in bacterial quorum sensing and virulence. The production of autoinducers-1 and -2, quinolone, indole and γ-amino butyrate signaling molecules was investigated in a set of soft-rot bacteria belonging to six Dickeya or Pectobacterium species including recent or emerging potato isolates. … (More)
Soft-rot bacteria Pectobacterium and Dickeya use N-acyl homoserine lactones (NAHSLs) as diffusible signals for coordinating quorum sensing communication. The production of NAHSLs was investigated in a set of reference strains and recently-collected isolates, which belong to six species and share the ability to infect the potato host plant. All the pathogens… (More)
Rhodococcus erythropolis strain R138 was isolated from the rhizosphere of Solanum tuberosum and selected for its capacity to degrade N-acyl-homoserine lactones, quorum-sensing signals used as communication molecules by the potato pathogens Pectobacterium and Dickeya. Here, we report the genome sequence of Rhodococcus erythropolis strain R138.
Social bacteria use chemical communication to coordinate and synchronize gene expression via the quorum-sensing (QS) regulatory pathway. In Pectobacterium, a causative agent of the blackleg and soft-rot diseases on potato plants and tubers, expression of the virulence factors is collectively controlled by the QS-signals N-acylhomoserine lactones (NAHLs).… (More)
Rhodococcus erythropolis is a worldwide-distributed actinobacterium that exhibits a remarkable metabolic versatility illustrated by its ability to degrade complex compounds, such as quorum-sensing signals N-acylhomoserine lactones (NAHLs), phenols, sterols and fuel derivatives. Because of its catabolic properties, R. erythropolis strains are proposed as… (More)
To investigate how exudation shapes root-associated bacterial populations, transgenic Arabidopsis thaliana plants that exuded the xenotopic compound octopine at low and high rates were grown in a nonsterile soil. Enumerations of both cultivable and octopine-degrading bacteria demonstrated that the ratios of octopine degraders increased along with octopine… (More)
Here we present the genome sequence of Dickeya solani strain RNS 08.23.3.1A (PRI3337), isolated from Solanum tuberosum. Dickeya solani, recently described on potato cultures in Europe, is a proposed new taxon closely related to the Dickeya dianthicola and Dickeya dadantii species.
N-acylhomoserine lactone (AHL)-mediated quorum-sensing (QS) regulates virulence functions in plant and animal pathogens such as Agrobacterium tumefaciens and Pseudomonas aeruginosa. A chemolibrary of more than 3500 compounds was screened using two bacterial AHL-biosensors to identify QS-inhibitors (QSIs). The purity and structure of 15 QSIs selected through… (More)
Quorum-sensing (QS) signals of the N-acylhomoserine lactone (NAHL) class are cleaved by quorum-quenching enzymes, collectively named NAHLases. Here, functional metagenomics allowed the discovery of a novel bacterial NAHLase in a rhizosphere that was treated with γ-caprolactone. As revealed by rrs-DGGE and rrs-pyrosequencing, this treatment increased the… (More)