1. Influence of Pb contamination in boreal forest soil on the growth and ligninolytic activity of litter-decomposing fungi.
- Author
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Tuomela M, Steffen KT, Kerko E, Hartikainen H, Hofrichter M, and Hatakka A
- Subjects
- Analysis of Variance, Basidiomycota enzymology, Basidiomycota growth & development, Biodegradation, Environmental drug effects, Carbon Radioisotopes metabolism, Finland, Peroxidases metabolism, Species Specificity, Time Factors, Basidiomycota drug effects, Lead toxicity, Lignin metabolism, Soil Microbiology, Soil Pollutants toxicity
- Abstract
Lignin mineralization activity of three basidiomycetous litter-decomposing fungi (LDF) was studied with humus layer samples taken from a boreal forest soil. The total Pb concentration in the samples was 32,000 mg kg(-1) and water soluble Pb 67 mg kg(-1). Synthetic lignin mineralization by Collybia dryophila and Clitocybe (Lepista) nebularis was strongly inhibited, whereas Stropharia coronilla was more tolerant to Pb stress in soil and liquid cultures. Purified laccases maintained their activity and purified MnPs remained partly active up to a concentration of 1450 mg Pb l(-1). High concentrations of Pb inhibited the growth of LDF and affected the activity of ligninolytic enzymes, but the extent of inhibition varied among different LDF species. In consequence, Pb contamination in soil may have a negative impact on recycling of organic carbon.
- Published
- 2005
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