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Fluorescent  Pseudomonas  strain Psd is a soil isolate, possessing multiple plant growth promoting (PGP) properties and biocontrol potential. In addition, the strain also possesses high Zn 2+  biosorption capability. In this study, we have investigated the role exopolysaccharides (EPS) play in Zn 2+  biosorption. We have identified that alginates are the prime components contributing to Zn 2+  biosorption. Deletion of the  alg8  gene, which codes for a sub-unit of alginate polymerase, led to a significant reduction in EPS production by the organism. We have also demonstrated that the increased alginate production in response to Zn 2+  exposure leads to improved biofilm formation by the strain. In the  alg8  deletion mutant, however, biofilm formation was severely compromised. Further, we have studied the functional implications of Zn 2+  biosorption by  Pseudomonas  strain Psd by demonstrating the effect on the PGP and biocontrol potential of the strain.

Players over the Surface: Unraveling the Role of Exopolysaccharides in Zinc Biosorption by Fluorescent Pseudomonas Strain Psd