Abstract
The influence of bivalent copper (Cu2+) and hexavalent chromium (Cr6+) ions on exopolysaccharide (EPS) and polyhydroxybutyrate (PHB) production by the bacterium Rhizobium tropici LBMP-C01 was investigated. The partial structure of both biopolymers produced by rhizobia were characterized, and the quantification of exoR and exoZ gene expression by real-time polymerase chain reaction (Real-Time PCR) was also investigated. Results showed that the supplementation with Cu2+ for 144 h induced an increase in the production of EPS by 48% and PHB by 46.66% compared to the control. Expression studies revealed that the expressed exoR and exoZ genes were affected by metal ion treatment. It can be stated that this particular rhizobial strain is a future potential candidates to produce super adsorbent quite useful for soil bioremediation.
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Acknowledgements
We thank the financial support of CAPES (Coordination of Improvement of Higher Level Personnel), the graduate program in Agricultural Microbiology (Universidade Estadual Paulista, UNESP-FCAV) and the Electronic Microscopy Laboratory (University of São Paulo, USP–Ribeirão Black-SP). The preparation of primer pairs for evaluation of gene expression was performed by Dr. Silvana Pompea of Val de Moraes. In the analyzes of FTIR we counted with the help of Dr Luis Alberto Conalgo, of Embrapa Instrumentação Agropecuária, Brazilian Company of Agricultural Research, São Carlos, Brazil. Also we thank for text review by Dr Manoel Victor Franco Lemos, UNESP Campus Jaboticabal, Brazil.
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Leonel, T.F., Moretto, C., Castellane, T.C.L. et al. The Influence of Cooper and Chromium Ions on the Production of Exopolysaccharide and Polyhydroxybutyrate by Rhizobium tropici LBMP-C01. J Polym Environ 27, 445–455 (2019). https://doi.org/10.1007/s10924-018-1359-4
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DOI: https://doi.org/10.1007/s10924-018-1359-4