Cell-to-Cell Communication in Rhizobia: Quorum Sensing and Plant Signaling

摘要: This chapter briefly describes the nodulation process and some of quorum-sensing regulatory systems that rhizobia use to monitor their population density. Conjugation is common among Rhizobiaceae, there are very strong selection pressures optimize growth in rhizosphere competitiveness. The regulation gene transfer by rhizobia. Individual rhizobial strains can contain up four different LuxI-type acyl-homoserine lactone (AHL) synthases associated regulators plus several other LuxR-type lacking dedicated AHL synthases. Mutations cinI cinR delayed decreased rate Rhizobium etli; because such altered was not observed R. leguminosarum cinI or mutants, this suggests sets genes induced via regulon these two species. Bradyoxetin activity found extracts all α-proteobacteria tested. compounds similar bradyoxetin may play an important role, only symbiosis, but also plant- animal-bacterial interactions. Elegant studies researchers suggest quorum sensing modulates both intra- inter-species cell-cell communications. It demonstrated halogenated furanones modulate LuxR through accelerated degradation transcriptional activator, rather than blocking displacing binding signal. Another potential way interfere with inactivation signal molecules.