Isolation and characterization of robust plant growth-promoting rhizobacteria from lignite mines, Gujarat

Ravi Patel Dilip N. Borada Amisha Patel Neil J. Shah   

Open Access   

Published:  Nov 11, 2022

DOI: 10.7324/JABB.2023.110225
Abstract

The objective of the present study was to isolate and characterize plant growth promoting rhizobacteria (PGPR) found in the rhizosphere zone of plants growing in coal mines, Gujarat, India. A total 37 soil samples were collected from the rhizosphere of mined site at Amod G-19 Extension Lignite Mine. The physicochemical analysis was carried out using standard protocols of Agri Biochem Research Lab. The physicochemical analysis of coal mine spoils revealed that the soils were contaminated with heavy metals, had salt stress, and had a variation in pH. The rhizobacteria were isolated from soil samples exhibiting multiple plant growth promoting traits such as nitrogen fixation, phosphate, potash, and zinc-solubilization. Total 89 isolates were selected for further detailed study. The maximum microbial population was found for nitrogen-fixing bacteria (60.67%) followed by phosphate (21.35%), zinc (14.60%), and potash-solubilizing bacteria (3.37%). Isolated PGPR were first assessed for hemolytic activity and isolates showing non-hemolytic activity were further identified by 16S rRNA gene sequencing. Phylogenetic analysis showed that the PGPR belonged to three major phyla: Proteobacteria, Actinobacteria, and Firmicutes. The most represented genera belonged to the Enterobacteriaceae family. The isolated rhizobacterial strains can act as suitable bioinoculants for reclamation of coal mine spoils and to mitigate the abiotic stress conditions in agricultural land.


Keyword:     Plant growth promoting rhizobacteria Non-pathogenic Reclamation Coal mine


Citation:

Patel R, Borada DN, Patel A, Shah NJ. Isolation and characterization of robust plant growth-promoting rhizobacteria from lignite mines, Gujarat. J App Biol Biotech. 2022. https://doi.org/10.7324/JABB.2023.110225

Copyright: Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike license.

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