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Regulation Mediated by N-Acyl Homoserine Lactone Quorum Sensing Signals in the Rhizobium-Legume Symbiosis

AuthorsCalatrava-Morales, Nieves; McIntosh, Matthew; Soto, María José
AdvisorMinisterio de Educación y Ciencia (España)
Issue Date18-May-2018
PublisherMultidisciplinary Digital Publishing Institute
CitationGenes 9 (5): 263 (2018)
AbstractSoil-dwelling bacteria collectively referred to as rhizobia synthesize and perceive <i>N</i>-acyl-homoserine lactone (AHL) signals to regulate gene expression in a population density-dependent manner. AHL-mediated signaling in these bacteria regulates several functions which are important for the establishment of nitrogen-fixing symbiosis with legume plants. Moreover, rhizobial AHL act as interkingdom signals triggering plant responses that impact the plant-bacteria interaction. Both the regulatory mechanisms that control AHL synthesis in rhizobia and the set of bacterial genes and associated traits under quorum sensing (QS) control vary greatly among the rhizobial species. In this article, we focus on the well-known QS system of the alfalfa symbiont <i>Sinorhizobium (Ensifer) meliloti</i>. Bacterial genes, environmental factors and transcriptional and posttranscriptional regulatory mechanisms that control AHL production in this <i>Rhizobium</i>, as well as the effects of the signaling molecule on bacterial phenotypes and plant responses will be reviewed. Current knowledge of <i>S. meliloti</i> QS will be compared with that of other rhizobia. Finally, participation of the legume host in QS by interfering with rhizobial AHL perception through the production of molecular mimics will also be addressed.
Publisher version (URL)http://dx.doi.org/10.3390/genes9050263
DOIhttp://dx.doi.org/doi: 10.3390/genes9050263
Identifiersdoi: 10.3390/genes9050263
Appears in Collections:(EEZ) Artículos
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