Quorum Sensing in Plant Growth-Promoting Rhizobacteria and Its Impact on Plant-Microbe Interaction
Quorum sensing is a widespread mechanism in enormous number of bacteria for regulating various gene expression in a cell density-dependent manner through production and recognition of small molecules known as autoinducer. Diverse kinds of quorum-sensing networks are found in different bacterial species. Among various signal molecules, acyl homoserine lactone (AHL) signal molecules are the most and widely studied in bacteria. A number of simple to advanced techniques are being used to identify and characterize signal molecules. Production of signal molecules in a number of rhizospheric bacteria is documented. Rhizosphere is an active atmosphere where microbe-microbe and microbe-plant interaction is highest due to rich availability of nutrients provided in the form of root exudates. Several ecological and interdependent key characters of bacteria, like antibiotic, siderophore, or enzyme secretion, virulence factors of phytopathogens, as well as plant-microbe communications, are coordinated through quorum sensing (QS). In this chapter, we have provided brief fundamental aspects of quorum sensing and then addressed the recent trends on the significance of quorum sensing and signal molecules in microbe-microbe and microbe-plant interactions in the rhizosphere with special reference to plant growth-promoting rhizobacteria and plant health.
KeywordsQuorum sensing AHLs PGPR Plant-microbe interaction Rhizosphere signaling
We are grateful to the Chairman, Department of Agricultural Microbiology, AMU, Aligarh, India for providing support to complete this task. We are also thankful to Mr. Faizan Abul Qais, research scholar, Department of Agricultural Microbiology, AMU, Aligarh, for his cooperation in preparing Fig. 16.1 of this chapter.
- Barriuso J, Solano BR, Lucas JA et al (2008b) Ecology, genetic diversity and screening strategies of plant growth promoting rhizobacteria. (PGPR). In: Ahmad I, Pichtel J, Hayat S (eds) Plant-bacteria interaction, strategies and techniques to promote plant growth. Wiley, Germany, pp 1–13Google Scholar
- De Weger LA, Bakker PAHM, Schippers B et al (1989) Pseudomonas spp with mutational changes in the O-antigenic side chain of their lipopolysaccharides are affected in their ability to colonize potato roots. In: Lugtenberg BJJ (ed) Signal molecules in plant-microbe interactions. Springer, Berlin, pp 197–202CrossRefGoogle Scholar
- Dekkers LC, van der Bij AJ, Mulders IHM et al (1998b) Role of the O-antigen of lipopolysaccharide, and possible roles of growth rate and of NADH, ubiquinone oxidoreductase (nuo) in competitive tomato root-tip colonization by Pseudomonas fluorescens WCS365. Mol Plant-Microbe Interact 11:763–771PubMedCrossRefGoogle Scholar
- Fekete A, Rothballer M, Frommberger M et al (2007) Identification of bacterial N-acyl homoserine lactones (AHLs) with a combination of ultra-performance liquid chromatography (UPLC), ultra-high-resolution mass spectrometry, and in-situ biosensors. Anal Bioanal Chem 387:455–467PubMedCrossRefGoogle Scholar
- Fekete A, Rothballer M, Hartmann A et al (2010) Identification of bacterial autoinducers. In: Kraemer R, Jung K (eds) Bacterial signaling. Wiley, Germany, pp 95–111Google Scholar
- Kalia VC (ed) (2015) Quorum sensing vs. quorum quenching: a battle with no end in sight. Springer, IndiaGoogle Scholar
- Malik AK, Fekete A, Gebefuegi I et al (2009) Single drop microextraction of homoserine lactones based quorum sensing signal molecules, and the separation of their enantiomers using gas chromatography mass spectrometry in the presence of biological matrices. Microchim Acta 166:101–107CrossRefGoogle Scholar
- Pérez-Montaño F, Jiménez-Guerrero I, Del Cerro P et al (2014) The symbiotic biofilm of Sinorhizobium fredii SMH12, necessary for successful colonization and symbiosis of Glycine max cv Osumi, is regulated by quorum sensing systems and inducing flavonoids via NodD1. PLoS One 9(8):e105901PubMedPubMedCentralCrossRefGoogle Scholar
- Rumbaugh KP (ed) (2011) Quorum sensing: methods and protocols. Methods in molecular biology. Springer, New YorkGoogle Scholar
- Yamada Y, Nihira T (1998) Microbial hormones and microbial chemical ecology. In: Barton DHR, Nakanishi K (eds) Comprehensive natural products chemistry. Elsevier Sciences, Amsterdam, pp 377–413Google Scholar