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Citation
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HERO ID
5881259
Reference Type
Journal Article
Title
Biotransformation of chromium by root nodule bacteria Sinorhizobium sp. SAR1
Author(s)
Jobby, R; Jha, P; Gupta, A; Gupte, A; Desai, N
Year
2019
Is Peer Reviewed?
1
Journal
PLoS ONE
EISSN:
1932-6203
Volume
14
Issue
7
Page Numbers
e0219387
Language
English
PMID
31361751
DOI
10.1371/journal.pone.0219387
Abstract
The present study aims to address the problem of chromium (Cr) toxicity by providing important insights into the mechanisms involved in its bioremediation. Among the 22 Rhizobium and Sinorhizobium isolates obtained from Sesbania sesban root nodules, Sinorhizobium sp. SAR1 (JX174035.1) tolerated the maximum Cr concentration (1mM) and hence was used for further studies. The excess secretion of extra polymeric substances, as seen from scanning electron micrographs, could be a probable mechanism of adaptation to the Cr stress. The Energy dispersive X-ray spectroscopy data did not show any peaks of Cr. The biosorption studies done on the isolate gave maximum adsorption capacity as 285.71mg/g. The isotherm studies showed a better fit to Langmuir isotherm. The Weber and Morris plot established that the phenomenon of adsorption was governed by film diffusion mechanism. The FTIR analysis suggested the role of cell wall components and extracellular polymeric substances in Cr adsorption to the biomass of Sinorhizobium. On the basis of these results a compiled mechanism of Cr (VI) adsorption and its biotransformation into Cr (III) by Sinorhizobium sp. SAR1 is explained. This work outlines a comprehensive detail for the exact phenomenon of Cr biotransformation by Sinorhizobium sp. SAR1. These results may further help in developing and enhancing effective bioremediation approaches.
Tags
IRIS
•
Chromium VI
Considered
Excluded
Other Not Pertinent
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