Responses of Typha orientalis Roots to Pb2+ Stress
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To investigate phytoremediation potential of Typha orientalis Presl in removing Pb2+ from polluted water, relevant experiments were conducted to evaluate responses activated by Pb2+ (0.25–2 mM) in T. orientalis roots over a period of ten days. Pb contents in subcellular fractions decreased in the following order: cell wall > organelle > soluble fraction. Most of Pb was located in cell wall and membrane system. Contents of K and Ca declined in T. orientalis roots under Pb2+ stress, but an opposite effect was noted for some mineral elements (Mg, Cu, Zn, and Fe). H2O2 level increased in a concentration-dependent manner, which induced oxidative stress. However, significant reduction in levels of O 2 ·− and malondialdehyde (MDA) were observed in all Pb2+ treatment groups. Findings indicated toxicity of Pb2+ to T. orientalis in terms of inducing oxidative stress and causing imbalance in mineral elements. However, T. orientalis also resisted Pb2+-induced damage through isolation mechanism, which involves cell wall and membrane systems.
KeywordsTypha orientalis Pb phytoremediation oxidative stress subcellular distribution
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- 1.Kalembasa, D. and Malinowska, E., Influence of sewage sludge fertilization on heavy metal content in biomass of silver grass during field experiment, Environ. Prot. Eng., 2009, vol. 35, pp. 149–155.Google Scholar
- 8.Xu, Y.K., Xu, X.Y., Chi, Y., and Jin, Y.G., Physiological responses and ultrastructural changes of Typha orientalis Presl under Pb2+ stress, Acta Bot. Boreali.–Occident. Sin., 2015, vol. 35, pp. 2018–2025.Google Scholar
- 11.Xu, X.Y., Shi, G.X., Ding, C.X., Xu, Y., Zhao, J., Yang, H.Y., and Pan, Q.H., Regulation of exogenous spermidine on the reactive oxygen species level and polyamine metabolism in Alternanthera philoxeroides (Mart.) Griseb under copper stress, Plant Growth Regul., 2011, vol. 63, pp. 251–258.CrossRefGoogle Scholar
- 19.Wang, J., Zhang, L.L., Kang, Y.N., and Shi, G.X., Ultrastructural localization and effect of lead on mineral elements in allus of Alternanthera philoxeroides, Acta Hydrobiol. Sin., 2012, vol. 36, pp. 307–315.Google Scholar
- 20.Mishra, S., Srivastava, S., Tripathi, R.D., Kumar, R., Seth, C.S., and Gupta, D.K., Lead detoxification by coontail (Ceratophyllum demersum L.) involves induction of phytochelatins and antioxidant system in response to its accumulation, Chemosphere, 2006, vol. 65, pp. 1027–1039.CrossRefPubMedGoogle Scholar