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Kinetics of nitroreductase-mediated phytotransformation of TNT in vetiver grass

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Abstract

The effectiveness of vetiver grass in removing 2,4,6-trinitrotoluene (TNT) and the involvement of nitroreductase (NR) enzyme in TNT degradation in vetiver has been documented in our earlier studies. The present study was designed to optimize the parameters influencing NR enzyme-mediated TNT transformation in vetiver. The current study is the first report of detailed kinetic examination of NR enzyme induced by TNT in vetiver. Results show that NR activity in vetiver root increased with exposure time as well as with initial TNT concentration, showing a first-order reaction kinetics at lower and a second-order reaction kinetics at higher TNT concentrations. Nitroreductase activity was higher in shoot compared to root in all TNT treatments. Increasing concentration of TNT resulted in a significant increase in the NR activity in shoot. Very high increase in the shoot NR activity indicates a faster root-to-shoot translocation of TNT. The optimum range of the factors influencing NR-mediated TNT transformation and the kinetic parameters were determined, which will be crucial for the application of vetiver for phytoremediation of TNT-contaminated systems.

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Acknowledgments

PD acknowledges Montclair State University for support in the form of Graduate Assistantship.

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Authors and Affiliations

  1. Department of Biology, Nazareth College of Rochester, Rochester, NY, USA

    P. Das

  2. Department of Civil, Environmental and Ocean Engineering, Stevens Institute of Technology, Hoboken, NJ, USA

    D. Sarkar

  3. Department of Biological Sciences, Michigan Technological University, Houghton, MI, 49931, USA

    R. Datta

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  1. P. Das
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  2. D. Sarkar
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  3. R. Datta
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Correspondence to R. Datta.

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Editorial responsibility: M. Abbaspour.

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Das, P., Sarkar, D. & Datta, R. Kinetics of nitroreductase-mediated phytotransformation of TNT in vetiver grass. Int. J. Environ. Sci. Technol. 14, 187–192 (2017). https://doi.org/10.1007/s13762-016-1128-7

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  • DOI: https://doi.org/10.1007/s13762-016-1128-7

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