Evaluation of chromium stress tolerance in endophytic bacteria isolated from chickpea root nodules and their plant growth-promoting traits

Sudipta Majhi Mausumi Sikdar   

Open Access   

Published:  Sep 15, 2025

DOI: 10.7324/JABB.2025.245742
Abstract

Endophytic bacteria reside within plant tissues and are frequently associated with plant growth promotion (PGP). The study aimed to isolate and screen endophytic bacteria associated with chickpea plants in heavy metal (HM)- contaminated agricultural fields. Chromium (Cr) was used as an HM to evaluate its potential to sustain PGP under Cr (VI) stress conditions. A total of 15 bacterial strains were isolated and screened for Cr (VI) tolerance, out of which two bacterial strains were selected for the production of PGP traits. Basic local alignment search tool alignment of 16S rRNA gene sequences confirmed the bacterial strains as Serratia spp. strain SMAJ_44 and Enterobacter spp. strain SMAJ_47. The IC50 value of Cr (VI) for strains SMAJ_44 and SMAJ was 500 and 270 μM. PGP traits were evaluated for both strains; strain SMAJ_47 showed high indole acetic acid production. Our findings indicate that both strains exhibited key PGP traits under lower Cr concentrations. In addition, the strains demonstrated tolerance to other HMs such as arsenic (As), cadmium (Cd), cobalt (Co), copper (Cu), as well as resilience to salt and drought stress. These findings highlight the potential of bacterial strains as bioinoculants for enhancing plant growth and supporting sustainable agriculture and bioremediation efforts.


Keyword:     Heavy metal stress Salt and drought stress Endophytic bacteria Plant growth promotion Sustainable agriculture


Citation:

Majhi S, Sikdar M. Evaluation of chromium stress tolerance in endophytic bacteria isolated from chickpea root nodules and their plant growth-promoting traits. J Appl Biol Biotech 2025. Article in Press. http://doi.org/10.7324/JABB.2025.245742

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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