Dual Regulatory Role of Penicillium oxalicum SL2 in Soil: Phosphorus Solubilization and Pb Stabilization

The mechanisms of the P. oxalicum SL2-mediated microbial community on phosphorus solubilization and Pb stabilization were investigated through a 90-day soil experiment. In the treatments inoculated with P. oxalicum SL2, the amount of P. oxalicum SL2-GFP remained at 77.8%–138.6% of the initial inocul...

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Published in:Environmental science & technology 2024-01, Vol.58 (1), p.603-616
Main Authors: Tong, Jianhao, Wu, Hanxin, Jiang, Xiaohan, Ruan, Chendao, Li, Weilong, Zhang, Haonan, Pan, Siyi, Wang, Jing, Ren, Jiayu, Zhang, Chun, Shi, Jiyan
Format: Article
Language:English
Subjects:
Biological activity
Bioremediation and Biotechnology
Calcium phosphates
Chemical precipitation
Correlation analysis
Ecological function
Edetic acid
Ethylenediaminetetraacetic acids
Fungi
Inoculation
Lead
Manganese
Microbial activity
Microbiomes
Microorganisms
Penicillium oxalicum
Phosphorus
Soil improvement
Soils
Solubilization
Stabilization
Tricalcium phosphate
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Summary:The mechanisms of the P. oxalicum SL2-mediated microbial community on phosphorus solubilization and Pb stabilization were investigated through a 90-day soil experiment. In the treatments inoculated with P. oxalicum SL2, the amount of P. oxalicum SL2-GFP remained at 77.8%–138.6% of the initial inoculation amount after 90 days, and the available phosphorus (AP) content increased 21.7%–40.8% while EDTA-Pb decreased 29.9%–43.2% compared with CK treatment. SEM-EDS results showed that P. oxalicum SL2 changed the agglomeration degree of microaggregates and promoted the combination of Pb with C and O elements. These phenomena were enhanced when applied with Ca3(PO4)2. Microbial community analysis showed that P. oxalicum SL2 improved soil microbial activity, in which the fungi absolute abundance increased about 15 times within 90 days. Correlation analyses and a partial least-squares path model showed that the activation of Penicillium, Ascobolus, Humicola, and Spizellomyces in a fungal community increased the content of oxalate and AP, which directly decreased EDTA-Pb content, while the change of Bacillus, Ramlibacter, Gemmatimonas, and Candidatus Solibacter in the bacterial community regulated Fe/Mn/S/N cycle-related functions, thus promoting the conversion of Pb to oxidizable state. Our findings highlight that P. oxalicum SL2 enhanced the microbial-induced phosphate precipitation process by activating soil microbial communities and regulating their ecological functions.
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.3c08881