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Mechanisms of Cd and Cr removal and tolerance by macrofungus Pleurotus ostreatus HAU-2

文献类型： 外文期刊

作者： Li, Xuanzhen 1 ; Wang, Youjing 3 ; Pan, Yanshuo 3 ; Yu, Hao 1 ; Zhang, Xiaolin 3 ; Shen, Yanping 4 ; Jiao, Shuai 1 ; Wu, 1 ;

作者机构： 1.Henan Agr Univ, Coll Forestry, Zhengzhou 450002, Peoples R China

2.Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Jiangsu, Peoples R China

3.Henan Agr Univ, Coll Life Sci, Zhengzhou 450002, Peoples R China

4.Xuchang Environm Monitoring Ctr, Xuchang 461099, Peoples R China

5.Henan Acad Agr Sci, Ind Crop Res Inst, Zhengzhou 450002, Peoples R China

关键词： Heavy metals;Macrofungus;Remediation;Accumulation;Adsorption

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Fungi bioaccumulation is a novel and highly promising approach to remediate polluted soil. The present study revealed a high ability to tolerate Cd and Cr in the fungus Pleurotus ostreatus HAU-2. However, high concentrations of Cd and Cr can suppress fungal growth and result in a variation of hypha micro morphology. Batch experiments were performed to investigate Cd and Cr stress effects on the amount of active oxygen in fungi, activity of antioxidant enzyme, as well as the removal efficiency of Cd and Cr. The results revealed that Cd and Cr caused increasing active oxygen and malonaldehyde (MDA) concentrations. Antioxidant enzymes play a central role in removing active oxygen, while glutathione (GSH) aids the Cd detoxification within cells. In fluid culture, fungal removal rates of Cd and Cr ranged from 44.85% to 80.36% and 14.49% to 45.55%, respectively. Intracellular accumulation and extracellular adsorption were the major removal approaches. Bag cultivation testing indicated that the fungus absorbed Cd and Cr contained within soil. In particular, the accumulation ability of Cd (15.6 mg kg(-1))"was higher compared to that of Cr (8.9 mg kg(-1)). These results successfully establish P. ostreatus HAU-2 as promising candidate for the remediation of heavy-metal polluted soils. (C) 2017 Elsevier B.V. All rights reserved.

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