Alleviation of Cr(VI) Toxicity and Improve Phytostabilization Potential of Vigna radiata Using a Novel Cr(VI) Reducing Multi-Stress-Tolerant Plant Growth Promoting Rhizobacterial Strain Bacillus flexus M2

نویسندگان

چکیده

Chromium (Cr) is a toxic heavy metal discharged into the environment through various anthropogenic sources, which affects soil properties and fertility. Hence, an effective restoration strategy need of hour. In this study, potent Cr(VI)-reducing strain M2 was isolated from rhizosphere Zea mays L. grown in leather industrial effluent contaminated sites identified as Bacillus flexus 16S rDNA sequencing. Strain exhibited strong tolerance to multi-stresses such temperature (up 45 °C), pH 9.0), Sodium chloride (NaCl) 7%) PEG 6000 50%) showed Cr(VI) reduction with presence multi-stresses. The interaction elucidated instrumentation analyses. Fourier Transform Infra-red (FTIR) Spectroscopy analysis confirmed that exposures induce significant changes cell-surface functional groups. Raman spectrum Transmission Electron Microscopy–Energy Dispersive X-ray spectroscopy (TEM-EDX) bio-reduction Cr(III) their intracellular localization Cr(III). Further, produced quantity Indole acetic acid (IAA), ammonia, exopolysaccharide (EPS) positive results for plant-growth-promoting activities Cr(VI). greenhouse experiments, inoculation progressively increased plant growth parameters stabilized antioxidant system Vigna radiata under Cr stress. However, exposure decreased level proline content, Hydrogen peroxide (H2O2) accumulation, enzymes expression V. radiata. Interestingly, significantly reduced accumulation root shoot when compared uninoculated treatment. study confirms rhizobacterial markedly negative impact toxicity improved even harsh environments by stabilizing mobility rhizosphere.

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ژورنال

عنوان ژورنال: Agronomy

سال: 2022

ISSN: ['2156-3276', '0065-4663']

DOI: https://doi.org/10.3390/agronomy12123079