期刊
JOURNAL OF MICROBIOLOGY
卷 52, 期 1, 页码 8-12出版社
MICROBIOLOGICAL SOCIETY KOREA
DOI: 10.1007/s12275-014-2560-3
关键词
bioaccumulation; heavy metal; Pb; mushroom; Flammulina velutipes
类别
资金
- Natural Science Foundation of China [31100070]
- College Provincial Natural Science Research Projects of Anhui Province [KJ2012A062]
- Research Projects of Anhui Science and Technology University [AKXK20102-1, ZCR2011296]
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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