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Xiao K.,Sichuan University | Liu H.,Sichuan University | Dong S.,Industrial Crop Research Institute of Sichuan Academy of Agricultural science | Fan X.,Sichuan University | And 2 more authors.
RSC Advances | Year: 2016

This work investigated the accumulation of nickel (Ni) and dissipation of quintozene (PCNB) by the mycelia of Stropharia rugoo-annulata (S. rugoo-annulata), together with the correlation between cell exudates and contaminants removal in liquid medium. Results showed that the removal rates of PCNB accounted for 20.75-55.26% and 42.39-90.92% of the initial concentration (125 mg kg-1) in un-inoculated and inoculated media, respectively. Ni accumulation in mycelia of S. rugoo-annulata at the end of experiment was 81.09 mg kg-1 when the initial concentration of Ni was 30 mg L-1 in polluted media, among which the proportion of NaCl-extractable (56.34%) was dominant. These results showed that PCNB and Ni were remarkably removed by mycelia incubation. The concentrations of cell exudates (macromolecular substances, low-weight-molecular organic acids (LMWOAs), liglinolytic enzymes) were quite different in both polluted and natural media inoculated with S. rugoo-annulata, indicating that the production of exudates was closely related to PCNB and Ni. Besides, the results of scanning electron microscopy (SEM) and diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) demonstrated that the pollutants influenced the surface phenotypic structure but not for basic cell structures, implying mycelia of S. rugoo-annulata could well tolerate the pollutants. Our results suggested the presence of S. rugoo-annulata was effective in promoting the bioremediation of Ni-PCNB and laid the foundation for a better understanding of the mechanism about contaminant removal by mushroom. © 2016 The Royal Society of Chemistry.

PubMed | Sichuan University and Industrial Crop Research Institute of Sichuan Academy of Agricultural science
Type: Journal Article | Journal: Journal of basic microbiology | Year: 2016

This study focused on the bioremediation role of Pleurotus eryngii in different characteristics soils contaminated with nickel (Ni) and fluoranthene. The results of bioremediation experiments showed that fluoranthene had a positive effect on the growth of P. eryngii, whereas Ni exerted a negative influence. The concentration of fluoranthene significantly decreased in inoculated soil accounting for 86.39-91.95% of initial concentration in soils and 71.46-81.76% in non-inoculated soils, which showed that the dissipation of fluoranthene was enhanced by mushroom inoculating. The highest removal rates of fluoranthene in sandy loam, loamy clay, and sandy soils reached to 87.81, 86.39, and 91.95%, respectively, which demonstrated that P. eryngii was more suitable for the bioremediation of sandy soil contaminated with fluoranthene. In addition, the presence of Ni tended to decrease the dissipation of fluoranthene in inoculated soil. Higher ligninolytic enzymes activities were detected in inoculated soils, resulting in the enhanced dissipation of fluoranthene in inoculated soils. Furthermore, P. eryngii had the ability to uptake Ni (4.88-39.53mgkg

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