Solubilization of zinc salts by a bacterium isolated from the air environment of a tannery

Abstract

Airborne bacteria isolated from a tannery air environment were screened for the property of solubilization of insoluble zinc oxide and zinc phosphate. Out of 10 strains tested, a strain of Pseudomonas aeruginosa (CMG 823) showed the best solubilization and solubilized both zinc oxide and zinc phosphate. Colonies of the bacterium produced clear haloes on solid medium which contained these insoluble metal compounds, but only when glucose was provided as a carbon source. Solubilization of zinc oxide and phosphate was accompanied by an increase in the H þ concentration of the medium, probably a consequence of the production of 2-ketogluconic acid. ß

Characterization of Rhizobacteria for Multiple Plant Growth Promoting Traits from Mung Bean Rhizosphere

“…In vitro solubilisation of ZnO and ZnCO 3 by rhizobacteria was determined in plate assay method given by Fasim et al, (2002) and Zinc solubilisation index (S.I.) was calculated as per the formula of Ramesh et al, (2014).…”

Role of Microsymbionts in Plant Microbe Symbiosis

“…The current perspective is to rescue soluble P loss, and score a quality production. This refreshing attribute of phosphate solubilization has increased the participation of agronomists in deploying the phosphate solubilizing bacteria as inoculums [28]. The avarice of bacteria to solubilize phosphate has positive influence on Plant life cycle.…”

Functional Attributes of Psychrotolerant Rhizobacteria from Wheat (Triticum aestivum L.) Rhizoshpere

“…Qualitative assay for Zn solubilisation: All the bacterial isolates were first screened by plate assay for their efficiency to solubilize zinc on Tris-minimal medium supplemented separately with zinc oxide (ZnO) [1.244 /L] = 15.23mM and zinc carbonate (ZnCO 3 ) [1.9882 g/L] = 5.0mM at a concentration equivalent to 0.1% Zn (Fasim et al, 2002). Zinc solubilization efficiency (SE) was calculated as described by Ramesh et al, (2014 Effect of Zinc compounds on pH of the medium: Bacterial isolates showing zones of clearance with ZnO/ (ZnCO 3 ) on solid medium were inoculated in minimal medium, supplemented with the same compounds (1mg/ml, each) and glucose (10mg/ml).…”