A simple method for direct isolation of N-acyl-L-homoserine lactone mediated biofilm-forming rhizobacteria from roots.

Abstract:

:Plant-associated bacteria produce quorum sensing (QS) signals for community (biofilm) formation and functioning in the rhizosphere. The QS-positive biofilm-forming rhizobacteria that excel benefits to the plants are now gaining increased importance for agricultural use due to their high competitiveness. However, there is no method available to distinguish these bacteria from the roots of a plant to ease the isolation. Currently, all the plant-associated bacteria have to be isolated, purified and subsequently screened for the QS activity using biosensor strains. This study describes a direct isolation method for N-acyl-homoserine lactone (AHL) type quorum sensing signal producing bacteria from the plant root. In this method, the root sample collected from the field was overlaid directly with the bacterial growth medium seeded with the biosensor reporter, Chromobacterium violaceum (CV026). The AHL produced by QS positive rhizobacteria residing on the surface of the root will be recognized by violacein production of CV026. The bacterial isolates recovered from rice root using this method were further confirmed for the QS activity and biofilm formation. All the QS-positive strains produced N-butyryl DL-homoserine lactone (a C4-AHL type) signal in the culture medium and had biofilm formation during in vitro culturing. The 16S rRNA gene sequences of these QS-positive biofilm-forming rhizobacteria revealed that these strains are phylogenetically close to Pseudomonas siluiensis, Aeromonas hydrophila and A. caviae. Therefore, this could be a simple, rapid and straightforward procedure for isolation and characterization of quorum-sensing rhizobacteria from plant roots.

journal_name

J Microbiol Methods

authors

Begum JF,Tamilarasi M,Pushpakanth P,Balachandar D

doi

10.1016/j.mimet.2018.11.018

subject

Has Abstract

pub_date

2019-01-01 00:00:00

pages

34-39

eissn

0167-7012

issn

1872-8359

pii

S0167-7012(18)30856-X

journal_volume

156

pub_type

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