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- Pb Tolerance and Bioaccumulation by the Mycelia of Flammulina velutipes in Artificial Enrichment Medium
- Changwei Zhu , Zhengpeng Li , Decai Li , Yan Xin
- J. Microbiol. 2014;52(1):8-12. Published online January 4, 2014
- DOI: https://doi.org/10.1007/s12275-014-2560-3
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Abstract
- Mushrooms have the ability to accumulate high concentrations of heavy metals, which gives them potential for use as bioremediators of environmental contamination. The Pb2+ tolerance and accumulation ability of living mycelia of Flammulina velutipes were studied in this work. Mycelial growth was inhibited when exposed to 1 mM Pb2+. The colony diameter on solid medium decreased almost 10% compared with the control. Growth decreased almost 50% when the Pb2+ concentration increased to 4 mM in the medium, with the colony diameter decreasing from 80 mm to 43.4 mm, and dry biomass production in liquid cultures decreasing from 9.23±0.55 to 4.27±0.28 g/L. Lead ions were efficiently accumulated in the mycelia. The amount of Pb2+ in the mycelia increased with increasing Pb2+ concentration in the medium, with the maximum concentration up to 707±91.4 mg/kg dry weight. We also show evidence that a large amount of the Pb2+ was adsorbed to the mycelial surface, which may indicate that an exclusion mechanism is involved in Pb tolerance. These results demonstrate that F. velutipes could be useful as a remediator of heavy metal contamination because of the characteristics of high tolerance to Pb2+ and efficient accumulation of Pb2+ ions by the mycelia.
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