Culturable microbial groups and thallium-tolerant fungi in soils with high thallium contamination.
Culturable microbial groups and thallium-tolerant fungi in soils with high thallium contamination.
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DOI：
10.1016/j.scitotenv.2012.09.053
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发表时间：
2012-12
期刊：
影响因子：
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通讯作者：
Jialong Sun;X. Zou;Zengping Ning;Min Sun;Jingquan Peng;T. Xiao
中科院分区：
文献类型：
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作者：
Jialong Sun;X. Zou;Zengping Ning;Min Sun;Jingquan Peng;T. Xiao
土壤铊污染因其高毒性对生态系统健康造成严重威胁。然而，Tl对土壤微生物群落的影响尚不清楚。本研究旨在研究长期高硫、高汞、高砷污染土壤中可培养微生物群的特征。污染来源于贵州省砷、汞、硫硫化物矿化及其伴生的采矿活动。结果表明，长期受tl污染的土壤中存在可培养细菌、丝状真菌和放线菌。一些真菌群在高达1000mgkg−1的高Tl水平下生长。根据形态特征和ITS分析，分离鉴定了9株耐tl真菌。优势属为木霉属、青霉属和拟青霉属。本研究获得的初步数据表明，某些微生物能够面对土壤中高Tl污染并保持其代谢活性和抗性。我们所分离的高度耐tl真菌在tl污染场地的修复中具有潜在的用途。
Thallium (Tl) contamination in soil exerts a significant threat to the ecosystem health due to its high toxicity. However, little is known about the effect of Tl on the microbial community in soil. The present study aimed at characterizing the culturable microbial groups in soils which experience for a long time high Tl contamination and elevated Hg and As. The contamination originates from As, Hg and Tl sulfide mineralization and the associated mining activities in the Guizhou Province, Southwest China. Our investigation showed the existence of culturable bacteria, filamentous fungi and actinomyces in long-term Tl-contaminated soils. Some fungal groups grow in the presence of high Tl level up to 1000mgkg−1. We have isolated and identified nine Tl-tolerant fungal strains based on the morphological traits and ITS analysis. The dominant genera identified were Trichoderma, Penicillium and Paecilomyces. Preliminary data obtained in this study suggested that certain microbes were able to face high Tl pollution in soil and maintain their metabolic activities and resistances. The highly Tl-tolerant fungi that we have isolated are potentially useful in the remediation of Tl-contaminated sites.