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Zhao X, Liu Y, Xie L, Fu X, Wang L, Gao MT, Hu J. Biochar promotes microbial CO 2 fixation by regulating feedback inhibition of metabolites. BIORESOURCE TECHNOLOGY 2024; 406:130990. [PMID: 38885727 DOI: 10.1016/j.biortech.2024.130990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2024] [Revised: 06/13/2024] [Accepted: 06/14/2024] [Indexed: 06/20/2024]
Abstract
Chemoautotrophs, the crucial contributors to biological carbon fixation, derive energy from reducing specific inorganic substances and utilize CO2 for growth. However, the release of extracellular free organic carbon (EFOC) by chemoautotrophic microorganisms can inhibit their own growth and metabolism. To reduce the feedback inhibition effect, a low-release biochar (BC-LR) was applied to adsorb EFOC. BC-LR not only adsorbed EFOC, but also selectively adsorbed the main inhibitory component, low molecular weight organics, in EFOC. In contrast, ordinary biochar could not effectively adsorb EFOC and its addition inhibited microbial growth and CO2 fixation. In Transwell culture, BC-LR promoted microbial growth by 190% and CO2 fixation by 29%, and exhibited better economic advantage, when compared with granular activated carbon. These findings provide a novel insight into the interaction between biochar and autotrophic microbial metabolism, offering an economically feasible approach to mitigate feedback inhibition of metabolites and promoting biological CO2 fixation.
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Affiliation(s)
- Xiaodi Zhao
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai City 200092, China; Research Institute for Shanghai Pollution Control and Ecological Security, Shanghai City 200092, China; Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai City 200444, China
| | - Yundong Liu
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai City 200444, China
| | - Li Xie
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai City 200092, China; Research Institute for Shanghai Pollution Control and Ecological Security, Shanghai City 200092, China
| | - Xiaohua Fu
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai City 200092, China; Research Institute for Shanghai Pollution Control and Ecological Security, Shanghai City 200092, China
| | - Lei Wang
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai City 200092, China; Research Institute for Shanghai Pollution Control and Ecological Security, Shanghai City 200092, China
| | - Min-Tian Gao
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai City 200444, China
| | - Jiajun Hu
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai City 200444, China.
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Wang Y, Li A, Zou B, Qian Y, Li X, Sun Z. The Combination of Buchloe dactyloides Engelm and Biochar Promotes the Remediation of Soil Contaminated with Polycyclic Aromatic Hydrocarbons. Microorganisms 2024; 12:968. [PMID: 38792797 PMCID: PMC11124401 DOI: 10.3390/microorganisms12050968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 04/17/2024] [Accepted: 04/29/2024] [Indexed: 05/26/2024] Open
Abstract
Polycyclic aromatic hydrocarbons (PAHs) cause serious stress to biological health and the soil environment as persistent pollutants. Despite the wide use of biochar in promoting soil improvement, the mechanism of biochar removing soil PAHs through rhizosphere effect in the process of phytoremediation remain uncertain. In this study, the regulation of soil niche and microbial degradation strategies under plants and biochar were explored by analyzing the effects of plants and biochar on microbial community composition, soil metabolism and enzyme activity in the process of PAH degradation. The combination of plants and biochar significantly increased the removal of phenanthrene (6.10%), pyrene (11.50%), benzo[a]pyrene (106.02%) and PAHs (27.10%) when compared with natural attenuation, and significantly increased the removal of benzo[a]pyrene (34.51%) and PAHs (5.96%) when compared with phytoremediation. Compared with phytoremediation, the combination of plants and biochar significantly increased soil nutrient availability, enhanced soil enzyme activity (urease and catalase), improved soil microbial carbon metabolism and amino acid metabolism, thereby benefiting microbial resistance to PAH stress. In addition, the activity of soil enzymes (dehydrogenase, polyphenol oxidase and laccase) and the expression of genes involved in the degradation and microorganisms (streptomyces, curvularia, mortierella and acremonium) were up-regulated through the combined action of plants and biochar. In view of the aforementioned results, the combined application of plants and biochar can enhance the degradation of PAHs and alleviate the stress of PAH on soil microorganisms.
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Affiliation(s)
- Yuancheng Wang
- Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China; (Y.W.); (A.L.)
| | - Ao Li
- Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China; (Y.W.); (A.L.)
| | - Bokun Zou
- Institute of Ecological Conservation and Restoration, Chinese Academy of Forestry, Beijing 100091, China; (B.Z.); (Y.Q.)
| | - Yongqiang Qian
- Institute of Ecological Conservation and Restoration, Chinese Academy of Forestry, Beijing 100091, China; (B.Z.); (Y.Q.)
| | - Xiaoxia Li
- Institute of Ecological Conservation and Restoration, Chinese Academy of Forestry, Beijing 100091, China; (B.Z.); (Y.Q.)
| | - Zhenyuan Sun
- Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China; (Y.W.); (A.L.)
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Guo J, Wang XY, Li T, Gao MT, Hu J, Li J. Effect of micro-nanobubbles with different gas sources on the growth and metabolism of chemoautotrophic microorganisms. Process Biochem 2022. [DOI: 10.1016/j.procbio.2022.12.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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