Abstract
Triphenylmethane dyes are extensively utilized in textile industries, medicinal products, biological stains, and food processing industries, etc. They are generally considered as xenobiotic compounds, which are very recalcitrant to biodegradation. The widespread persistence of such compounds has generated concerns with regard to remediation of them because of their potential carcinogenicity, teratogenicity, and mutagenicity. In this study, we present a system of phytoremediation by Arabidopsis plants developed on the basis of overexpression of triphenylmethane reductase (TMR) from the Citrobacter sp. The morphology and growth of TMR transgenic Arabidopsis plants showed significantly enhanced tolerances to crystal violet (CV) and malachite green (MG). Further, HPLC and HPLC–MS analyses of samples before and after dye decolorization in culture media revealed that TMR transgenic plants exhibited strikingly higher capabilities of removing CV from their media and high efficiencies of converting CV to non-toxic leucocrystal violet (LCV). This work indicates that microbial degradative gene may be transgenically exploited in plants for bioremediation of triphenylmethane dyes in the environment.
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Acknowledgments
The authors thank Professor Nigel Halford, Rothamsted Research, United Kingdom, for critical reading of the manuscript. The research was supported by the National Natural Science Foundation of China (31071486), The Key Project Fund of the Shanghai Municipal Committee of Agriculture (No. 2009-6-4 and No. 2011-1-8), and International Scientific and Technological Cooperation (2010DFA62320).
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Xiao-Yan Fu and Wei Zhao contributed equally to this article.
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Fu, XY., Zhao, W., Xiong, AS. et al. Phytoremediation of triphenylmethane dyes by overexpressing a Citrobacter sp. triphenylmethane reductase in transgenic Arabidopsis . Appl Microbiol Biotechnol 97, 1799–1806 (2013). https://doi.org/10.1007/s00253-012-4106-0
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DOI: https://doi.org/10.1007/s00253-012-4106-0