Evaluating the in vitro plant growth promoting potential and antibiotic susceptibility of chromate tolerant bacteria
Gaurav Chowdhury
, Priti Mazumder , Debabrata Das
Heavy Metal Contamination, Chromate Tolerance, Plant Growth-Promoting Bacteria (PGPB), Bioremediation, Chromium Reduction, Oxidative Stress, Antibiotic Susceptibility, Indole-3-Acetic Acid (IAA), Hydrogen Cyanide (HCN), Ammonia Production, Zinc Solubilization, Phosphate Solubilization, Siderophore Production, Biofertilizers, Sustainable Agriculture
Heavy metals such as hexavalent chromium Cr (VI) is known to challenge plant health and growth due to its effects in production of free radicals and reactive oxygen species (ROS). This results in alteration of cell components including nucleic acids, proteins, and lipids as well. Plant growth-promoting bacteria (PGPB) seem to pose a more environmentally sounded approach to these effects. These bacteria improve plant growth through biosorption process, bio-reduction and bios-transformation of toxic metal ions. This paper aims at assessing the plant growth promoting ability and antibiotic resistance of two bacterial isolated species, Bacillus species and Corynebacterium species isolated from arable soil with tolerance to chromate. Plant growth-promoting characteristics of bacterial isolates were identified through in-vitro screening tests including IAA production, HCN production, ammonia production, zinc solubilization, phosphate solubilization and siderophore production. The findings made it clear that both species had high growth-promoting characteristics with stereo typed differences; Bacillus sp. was superior to Corynebacterium sp. in terms of its P-solubilization, siderophore production, etc. The two isolates were able to produce ammonia hence playing a role in nitrogen availability to plant shoots and elongation. Furthermore, the antimicrobial susceptibility test revealed moderate resistance of the samples which signified their adaptability towards different environment and possible antimicrobial activity against pathogenic microorganisms. The isolates were also characterized by substantial chromium-reducing efficacy, which changed soluble Cr (VI) to the less dangerous Cr (III) species through phenomena such as biosorption and bio-reduction. These bacterial strains hold the bio-remedial potential to combat contaminated soils and immobilise/re-adsorb heavy metals and enhance the plant health. The study implies the tested PGPB isolates as useful biofertilizer or biocontrol agents for the sustainable means of agriculture, cost-efficient than chemical fertilizer. Therefore, it is advised that more canopy light modification field trials and greenhouse studies be conducted in order to assess the full feasibility of such practices in agricultural ecosystems.
"Evaluating the in vitro plant growth promoting potential and antibiotic susceptibility of chromate tolerant bacteria ", IJSDR - International Journal of Scientific Development and Research (www.IJSDR.org), ISSN:2455-2631, Vol.10, Issue 9, page no.a379-a415, September-2025, Available :https://ijsdr.org/papers/IJSDR2509047.pdf
Volume 10
Issue 9,
September-2025
Pages : a379-a415
Paper Reg. ID: IJSDR_304869
Published Paper Id: IJSDR2509047
Downloads: 000199
Research Area: Life Sciences All
Country: Tinsukia , Assam, India
DOI: https://doi.org/10.56975/ijsdr.v10i9.304869
ISSN: 2455-2631 | IMPACT FACTOR: 9.15 Calculated By Google Scholar | ESTD YEAR: 2016
An International Scholarly Open Access Journal, Peer-Reviewed, Refereed Journal Impact Factor 9.15 Calculate by Google Scholar and Semantic Scholar | AI-Powered Research Tool, Multidisciplinary, Monthly, Multilanguage Journal Indexing in All Major Database & Metadata, Citation Generator
Publisher: IJSDR(IJ Publication) Janvi Wave
