Abstract
Reclamation of chromium-contaminated soil by bacteria is a big confront concerning to soil health restoration, food safety, and environmental protection. Herein, the chromium-resistant Bacillus aryabhattai CTSI-07 (MG757377) showed resistance to 1000 and 300 ppm of Cr(VI) in nutrient rich Luria Bertani (LB) and nutrient-deficient sucrose low phosphate (SLP) medium, respectively. It reduced 96.7% of Cr(VI) from contaminated soil in the presence of 100 ppm of Mg within 96 h under optimized conditions. Furthermore, Cr(VI) reduction by the bacteria was validated by Fourier transform infrared spectroscopic (FTIR) and X-ray diffraction (XRD) analysis. Besides Cr(VI) reduction, the bacterial strain also showed plant growth promoting traits like N2 fixation and indole acetic acid (IAA) production. On the other hand, transmission electron microscopy (TEM) imaging confirmed polyhydroxyalkanoates’ (PHAs) granule accumulation and 0.5 g/l of PHAs was extracted from bacterial cell using SLP medium. Infra-red (IR) spectra and proton nuclear magnetic resonance (1H NMR) chemical shift patterns established the PHAs as polyhydroxybutyrate (PHB). Melting (Tm) and thermal degradation (Td) temperature of the PHB were 169 °C and 275 °C, respectively, as evident from thermogravimetry differential thermal analysis (TG-DTA). Atomic force microscopic (AFM) imaging depicted that the PHB film surface was rough and regular. Furthermore, the multi-metal-resistant, plant growth–promoting, and PHB-producing bacteria could reduce 99.82% of Cr(VI) from contaminated soil within 120 days in pot culture. Thus, it can be used for long-term reclamation of chromium-contaminated soil to restore soil health, provide food safety, and environmental protection.
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The authors are grateful to the CIF, OUAT Odisha for laboratory support to carry out the research work.
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Dr. Deviprasad Samantaray and Dr. Debasis Dash designed and supervised the research work. Dr. Swati Pattnaik carried out the research work and manuscript drafting. Dr. Swati Mohapatra and Dr. Sumanta Kumar Mishra reviewed the manuscript. Dr. Swayamsidha Pati and Matrujyoti Pattnaik collected and analyzed data. Dr. Sudipta Maity provided assistance in statistical analysis of data. Deepika Devadarshini and Swati Samal prepared figures.
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Pattnaik, S., Dash, D., Mohapatra, S. et al. Reclamation of chromium-contaminated soil by native Cr(VI)-reducing and PHA-accumulating Bacillus aryabhattai CTSI-07. Int Microbiol (2023). https://doi.org/10.1007/s10123-023-00421-6
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DOI: https://doi.org/10.1007/s10123-023-00421-6