Quorum-sensing in Gram-negative bacteria

Whitehead, Neil A.; Barnard, Anne M. L.; Slater, Holly; Simpson, Natalie J. L.; Salmond, George P. C.

doi:10.1111/j.1574-6976.2001.tb00583.x

Cited by 1,325 publications

(998 citation statements)

References 345 publications

(579 reference statements)

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“…Quorum sensing (QS) within and between bacterial populations is a major regulatory mechanism in bacteria to adjust their metabolism to crowded conditions or other changes in the biotic and abiotic environment (Whitehead et al 2001). Interference with bacterial QS by host plants has been documented.…”

Section: Plant-mediated Disease Suppression By Rhizobacteriamentioning

confidence: 99%

Plant responses to plant growth-promoting rhizobacteria

2007

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Non-pathogenic soilborne microorganisms can promote plant growth, as well as suppress diseases. Plant growth promotion is taken to result from improved nutrient acquisition or hormonal stimulation. Disease suppression can occur through microbial antagonism or induction of resistance in the plant. Several rhizobacterial strains have been shown to act as plant growth-promoting bacteria through both stimulation of growth and induced systemic resistance (ISR), but it is not clear in how far both mechanisms are connected. Induced resistance is manifested as a reduction of the number of diseased plants or in disease severity upon subsequent infection by a pathogen. Such reduced disease susceptibility can be local or systemic, result from developmental or environmental factors and depend on multiple mechanisms. The spectrum of diseases to which PGPRelicited ISR confers enhanced resistance overlaps partly with that of pathogen-induced systemic acquired resistance (SAR). Both ISR and SAR represent a state of enhanced basal resistance of the plant that depends on the signalling compounds jasmonic acid and salicylic acid, respectively, and pathogens are differentially sensitive to the resistances activated by each of these signalling pathways. Root-colonizing Pseudomonas bacteria have been shown to alter plant gene expression in roots and leaves to different extents, indicative of recognition of one or more bacterial determinants by specific plant receptors. Conversely, plants can alter root exudation and secrete compounds that interfere with quorum sensing (QS) regulation in the bacteria. Such two-way signalling resembles the interaction of root-nodulating Rhizobia with legumes and between mycorrhizal fungi and roots of the majority of plant species. Although ISR-eliciting rhizobacteria can induce typical early defence-related responses in cell suspensions, in plants they do not necessarily activate defence-related gene expression. Instead, they appear to act through priming of effective resistance mechanisms, as reflected by earlier and stronger defence reactions once infection occurs.

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Section: Plant-mediated Disease Suppression By Rhizobacteriamentioning

confidence: 99%

Plant responses to plant growth-promoting rhizobacteria

2007

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“…N-Acylhomoserine lactone (AHL) is the predominant signal molecule involved in QS (21) and it affects the expression of many genes and behaviors in various bacteria (26,29,30). AHLs mediated gene transcription controls a variety of bacterial phenotypes (9,28).…”

Section: Introductionmentioning

confidence: 99%

2(5H)-Furanone: a prospective strategy for biofouling-control in membrane biofilm bacteria by quorum sensing inhibition

Ponnusamy¹,

Paul²,

Kim³

et al. 2010

Braz. J. Microbiol.

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Biofouling of membranes demands costly periodic cleaning and membrane replacement. A sustainable and environmentally friendly solution for maintenance is not available and would be of great interest for many purposes including economical. As complex biofilm formation by environmental strains is the major cause of biofouling and biofilm formation in most cases are controlled by N-Acylhomoserine lactone (AHL)-mediated Quorum Sensing (QS). An effort was made to understand the appropriateness of 2(5H)-furanone, to use against biofouling of membranes. QS inhibition activity by 2(5H)-furanone was studied using bioindicator strains and known AHLs of different acyl chain lengths. The biofilm inhibition was studied by growth analysis on polystyrene plate of Aeromonas hyrdrophila, an environmental biofilm strain isolated from a bio-fouled reverse osmosis (RO) membrane. Results showed a QS inhibition activity against a wide range of AHLs and also biofilm formation by 2(5H)-furanone, which is believed to act as a potential quorum inhibition agent in a bacterial biofilm community.

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“…This type of gene regulation is known as quorum sensing (1,19). The quorumsensing system depends on diffusible signal molecules, termed autoinducers, which enable bacteria to monitor their own population density.…”

mentioning

confidence: 99%

Mouse and Human Cell Activation by N -Dodecanoyl- dl -Homoserine Lactone, a Chromobacterium violaceum Autoinducer

et al. 2006

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Chromobacterium violaceum produces autoinducers, including homoserine lactones (HSLs), for genetic regulation. Among the seven HSLs derived from C. violaceum we evaluated, only C 12 -HSL stimulated the production of inflammatory cytokines in mammalian monocytic cell lines through the activation of the NF-B signaling pathway besides their quorum-sensing role, like 3-oxo-C 12 -HSL from Pseudomonas aeruginosa.

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Quorum-sensing in Gram-negative bacteria

Cited by 1,325 publications

References 345 publications

Plant responses to plant growth-promoting rhizobacteria

Plant responses to plant growth-promoting rhizobacteria

2(5H)-Furanone: a prospective strategy for biofouling-control in membrane biofilm bacteria by quorum sensing inhibition

Mouse and Human Cell Activation by N -Dodecanoyl- dl -Homoserine Lactone, a Chromobacterium violaceum Autoinducer

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