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Mycoremediation of heavy metal (Cd and Cr)-polhited soil through indigenous metallotolerant fungal isolates

机译:重金属(镉和铬)污染土壤通过原生金属硫真菌分离株的介导

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Remediation of heavy metals, other than microbial bioleaching method, is expensive and unsuitable for large contaminated areas. The current study was aimed to isolate, identify, and test the potential of indigenous fungal strains for heavy metal removal from contaminated soil. A total of three metallotolerant fungal strains, i.e., Aspergillus niger (M1DGR), Aspergillus fumigatus (M3Ai), and Penicillium rubens (M2Aii), were isolated and identified by phenotyping and genotyping from heavy metal-contaminated soil of Hattar Industrial Estate, Pakistan. A. niger was found to be the most successful strain for the removal of heavy metals from the contaminated soil with maximum bioaccumulation efficiency of 98% (Cd) and 43% (Cr). In contrast, A. fumigatus showed comparatively low but still considerable bioleaching potential, i.e., 79% and 69% for Cd and Cr removal, respectively. Maximum metal uptake efficiency, i.e., 0.580 mg g(-1) and 0.152 mg g(-1) by A. niger strain was noticed for Cd and Cr with Czapek yeast extract (CYE) and Sabouraud dextrose broth (SDB) media, respectively. A. fumigatus (M3Ai) exhibited the maximum bioleaching capacity (0.40 mg g(-1)) for Cr with CYE medium. The results reveal that A. niger M1DGR and A. fumigatus M3Ai could be used to develop new strategies to remediate soil contaminated with heavy metals (Cd and Cr) through either in situ or ex situ mycoremediation.
机译:除微生物浸出法外,重金属的修复成本高昂,不适合大面积污染区域。当前的研究旨在分离,鉴定和测试本地真菌菌株从污染土壤中去除重金属的潜力。通过表型和基因分型从巴基斯坦哈塔塔工业园区的重金属污染土壤中分离并鉴定了总共三种金属耐受真菌菌株,即黑曲霉(M1DGR),烟曲霉(M3Ai)和红青霉(M2Aii)。发现黑曲霉是最成功的从受污染土壤中去除重金属的菌株,其最大生物累积效率为98%(Cd)和43%(Cr)。相比之下,烟曲霉显示出较低的生物浸出潜力,但仍具有相当大的生物浸出潜力,即分别去除Cd和Cr的79%和69%。注意到最大的金属吸收效率,即黑曲霉菌株利用Czapek酵母提取物(CYE)和Sabouraud葡萄糖肉汤(SDB)培养基分别吸收Cd和Cr的0.580 mg g(-1)和0.152 mg g(-1) 。烟曲霉(M3Ai)在CYE培养基中对Cr表现出最大的生物浸出能力(0.40 mg g(-1))。结果表明,黑曲霉M1DGR和烟曲霉M3Ai可用于开发新策略,以通过原位或异位mycoremediation修复被重金属(Cd和Cr)污染的土壤。

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