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

AutorCalatrava-Morales, Nieves; McIntosh, Matthew; Soto, María José
DirectorMinisterio de Educación y Ciencia (España)
Fecha de publicación18-may-2018
EditorMultidisciplinary Digital Publishing Institute
CitaciónGenes 9 (5): 263 (2018)
ResumenSoil-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.
Versión del editorhttp://dx.doi.org/10.3390/genes9050263
URIhttp://hdl.handle.net/10261/165066
DOIhttp://dx.doi.org/doi: 10.3390/genes9050263
Identificadoresdoi: 10.3390/genes9050263
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