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Mycoremediation of manganese and phenanthrene by Pleurotus eryngii mycelium enhanced by Tween 80 and saponin

  • Environmental biotechnology
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Abstract

Bioremediation of areas co-contaminated with metals and polycyclic aromatic hydrocarbons (PAHs) by mushrooms has attracted considerable attention in recent years. In this study, Pleurotus eryngii was introduced for the removal of Mn and phenanthrene (Phe) from potato liquid medium (PDL) simultaneously. Effects of Tween 80 and saponin on P. eryngii growth together with Mn uptake as well as Phe removal were investigated. Although pollutants had a negative effect on mycelial morphology and growth, P. eryngii could still tolerate and remove Mn and Phe. Tween 80 increased removal of Mn and Phe through increase of P. eryngii growth, Phe solubility, pollutants bioavailability, and specific surface area of mycelium pellets, moreover, the activities of manganese peroxidase (MnP) and laccase, which played an important role on PAHs biodegradation. The maximal removal of Mn and Phe was achieved (92.17 and 93.85 % after 15 days incubation, respectively) with 0.6 g L−1 Tween 80. Treatments with saponin markedly inhibited P. eryngii growth (50.17–66.32 % lower relative to control) due to its fungistatic activity. Nevertheless, saponin could slightly enhance Phe removal through increasing solubility of Phe, and Phe removal rate varied from 80.53 to 87.06 % in saponin treatments. Joint stress of Mn and Phe induced a strong antioxidative response, and superoxide dismutase (SOD) activity decreased in surfactants-treated mycelium compared with control. Generally, Tween 80 was more suitable for strengthening mycoremediation by P. eryngii than saponin, and could be a promising alternative for the remediation of heavy metals and PAHs co-contaminated sites by mushrooms.

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Acknowledgments

This study was financially supported by the NSFC (No. 41171253, No. J1103518), and the National High Technology Research and Development Program of China (No.2013AA06A210). The authors wish to thank Professor Dong Yu and Guanglei Cheng from Sichuan University for their technical assistance.

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  1. Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, Sichuan, 610064, China

    Minghui Wu, Wenbo Ding, Yuanyuan Li & Heng Xu

  2. School of International Business, Southwestern University of Finance and Economics, Chengdu, Sichuan, 611130, China

    Yongan Xu

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Wu, M., Xu, Y., Ding, W. et al. Mycoremediation of manganese and phenanthrene by Pleurotus eryngii mycelium enhanced by Tween 80 and saponin. Appl Microbiol Biotechnol 100, 7249–7261 (2016). https://doi.org/10.1007/s00253-016-7551-3

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