Abstract
This study investigated the removal and translocation mechanism of cadmium (Cd) by Oudemansiella radicata (O. radicata) in mushroom-soil rhizosphere and the fruiting body of mushroom. For this, the biomass, physiochemical parameters, and Cd distribution of O. radicata were examined in the soil spiked with 0, 10, 20, and 30 mg kg−1 Cd. The soil microecology and the Cd fractionation in the soil rhizosphere were also measured. Results showed that, O. radicata possesses high capability to tolerate Cd, although its surface phenotypic structure was influenced by high concentrations of Cd. The observed concentrations of Cd in O. radicata were in the following order: root (the part of stipe in soil) > pileus > stipe. The presence of Cd led to an increase in the production of antioxidant enzymes and glutathione (GSH). These results suggested that antioxidant enzymes and GSH assisted detoxification and accumulation of Cd within the mushroom. Meanwhile, in the soil rhizosphere, the concentrations of oxalic, citric, and malic acids were enhanced with the treatment of Cd, indicating that the production of these acids was closely related to the presence of Cd in soils. Additionally, the proportion of acid-soluble Cd was increased and the soil microecology (microbial counts, urease, and acid phosphatase activities) also enhanced with the inoculation of O. radicata. Overall, this study demonstrated that O. radicata is a promising candidate for the remediation of Cd-contaminated soil.
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Acknowledgements
The authors wish to thank Professor Guanglei Cheng and Dong Yu from Sichuan University for their technical assistance.
Funding
The study was financially supported by the Key Research and Development Program of Sichuan Province (2017SZ0181), the Agricultural science and Technology Achievements Transformation Program of Sichuan Province (2017NZZJ008), and the NSFC (No. 41171253).
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Li, X., Xiao, K., Ma, H. et al. Mechanisms into the removal and translocation of cadmium by Oudemansiella radicata in soil. Environ Sci Pollut Res 26, 6388–6398 (2019). https://doi.org/10.1007/s11356-018-4042-3
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DOI: https://doi.org/10.1007/s11356-018-4042-3