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Dissolved oxygen-mediated enrichment of quorum-sensing phenomenon in the bacterial community to combat oxidative stress.
Archives of Microbiology 2018 July 12
Microbial community with their plasticity follows a course of changes that allow adaptation and survival in a particular habitat. In this study perturbations in microbial flora dwelling in two reactors with phenol as a carbon source under the limiting nitrogen and phosphorus conditions were monitored for 3 months with alterations of dissolved oxygen (DO). With the time, the shift in diversity and abundance of bacteria were observed with simultaneous increase in biofilm-forming bacteria like Pseudomonas, Escherichia, etc. Functional level screening revealed that the abundance of core metabolic genes were not much altered, however, the regulated level of increase in quorum sensing genes (acyl-homoserine lactone), biofilm-forming genes, catalase and ferroxidase enzymes at high DO suggest the survival mechanism of the community. This study sheds light on survival route followed by the bacterial community with abiotic stress, such as an increase in DO.
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