Bacterial extracellular polymeric substances: Impact on soil microbial community composition and their potential role in heavy metal-contaminated soil

Li, Yi; Shi, Xinwei; Ling, Qiujie; Li, Song-Ying; Wei, Jiayu; Xin, Meifen; Xie, Dongyu; Chen, Xuan; Liu, Kehui; Yu, Fangming

doi:10.1016/j.ecoenv.2022.113701

Cited by 16 publications

(5 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The phyla Chloroflexi and Actinobacteria were also found to be tolerant to Cd and As [21,[60][61][62]. For the fungal phyla, it was found that Ascomycetes, Basidiomycota, and Mortierellomycota were dominant in HM-contaminated soils [63,64]. The most dominant archaea in AS, NWS, and RWS was Thaumarchaeota, which could be detected in HM-contaminated soils [65].…”

Section: Discussionmentioning

confidence: 96%

Assessment of the Pollution of Soil Heavy Metal(loid)s and Its Relation with Soil Microorganisms in Wetland Soils

et al. 2022

View full text Add to dashboard Cite

This study was performed to provide a comprehensive assessment of the pollution of soil heavy metal(loid)s (HMs) and the relationships between HMs (including As, Cd, Cr, Cu, Ni, Se, Pb, Hg, and Mn) and soil microorganisms in the different utilized types of wetland soils (agricultural soils (AS), natural wetland soils (NWS), and restored wetland soils (RWS)). Our results indicated that As and Cd in the studied region accumulated to different degrees in AS, NWS, and RWS. The microbial community compositions and heatmaps showed that the compositions of bacterial, fungal, and archaeal communities had differences in various degrees. A comprehensive assessment was performed including the geoaccumulation index (Igeo), the pollution load index (PLI), and the potential ecological risk index (ERI) to evaluate the pollution of HMs. Based on the results, Cd and As were identified as the major pollutants that contributed to the potential ecological risk in AS, NWS, and RWS. The co-occurrence network analysis indicated that the bacterial genera Bryobacter and Acidothermus, the fungal genera Fusarium and Anguillospor, and the archaeal unclassified genus Nitrososphaeraceae were the key taxa in the microbial networks. Based on the interactive forward selection method in redundancy analysis (RDA), it could be concluded that microbial community compositions were mainly controlled by As.

show abstract

Section: Discussionmentioning

confidence: 96%

Assessment of the Pollution of Soil Heavy Metal(loid)s and Its Relation with Soil Microorganisms in Wetland Soils

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Soil physicochemical properties (CEC, OM, AN, AP, AK) and T-Cd and T-As concentrations were the primary elements influencing the makeup of bacterial and fungal populations. Additionally, the key drivers of the composition of the soil microorganisms were soil nutrients, including AN and AP [ 62 ]. The predominant phylum of soil bacteria, Acidobacteriota, exhibits an extremely unfavorable association with plant Cd concentration ( Figure 5 ).…”

Section: Discussionmentioning

confidence: 99%

Combination of Biochar and Trichoderma harzianum Can Improve the Phytoremediation Efficiency of Brassica juncea and the Rhizosphere Micro-Ecology in Cadmium and Arsenic Contaminated Soil

Yao

Zhou

Duan

et al. 2023

Plants

View full text Add to dashboard Cite

Phytoremediation is an environment-friendly method for toxic elements remediation. The aim of this study was to improve the phytoremediation efficiency of Brassica juncea and the rhizosphere soil micro-ecology in cadmium (Cd) and arsenic (As) contaminated soil. A field experiment was conducted with six treatments, including a control treatment (CK), two treatments with two contents of Trichoderma harzianum (T1: 4.5 g m−2; T2: 9 g m−2), one biochar treatment (B: 750 g m−2), and two combined treatments of T1B and T2B. The results showed Trichoderma harzianum promoted the total chlorophyll and translocation factor of Brassica juncea, while biochar promoted plant biomass compared to CK. T2B treatment showed the best results, which significantly increased Cd accumulation by 187.49–308.92%, and As accumulation by 125.74–221.43%. As a result, the soil’s total Cd content was reduced by 19.04% to 49.64% and total As contents by 38.76% to 53.77%. The combined amendment increased the contents of soil available potassium, phosphorus, nitrogen, and organic matter. Meanwhile, both the activity of glutathione and peroxidase enzymes in plants, together with urease and sucrase enzymes in soil, were increased. Firmicutes (dominant bacterial phylum) and Ascomycota (dominant fungal phylum) showed positive and close correlation with soil nutrients and plant potentially toxic elements contents. This study demonstrated that phytoremediation assisted by biochar and Trichoderma harzianum is an effective method of soil remediation and provides a new strategy for enhancing plant remediation efficiency.

show abstract

“…The main factors influencing the bacterial community structure in Poa pratensis are pH, TN, AP, and Cd, as well as Cd forms F2, F3, and F4 (p < 0.05) (Figure 6c,d). The results indicate that the soil microbial community structure is driven by soil nutrients such as TN and AP [47]. By combining the Spearman correlation heatmap with UPGMA clustering analysis, we investigated the relationship between soil properties and soil microbial community composition at the phylum level in non-rhizosphere and rhizosphere soils (Figure 7).…”

Section: The Response Relationship Between Plant Remediation and Soil...mentioning

confidence: 99%

Microbiological Mechanisms of Collaborative Remediation of Cadmium-Contaminated Soil with Bacillus cereus and Lawn Plants

Zhou,

Yang,

Chen

et al. 2024

Plants

View full text Add to dashboard Cite

Severe cadmium contamination poses a serious threat to food security and human health. Plant–microbial combined remediation represents a potential technique for reducing heavy metals in soil. The main objective of this study is to explore the remediation mechanism of cadmium-contaminated soil using a combined approach of lawn plants and microbes. The target bacterium Bacillus cereus was selected from cadmium-contaminated soil in mining areas, and two lawn plants (Festuca arundinacea A‘rid III’ and Poa pratensis M‘idnight II’) were chosen as the target plants. We investigated the remediation effect of different concentrations of bacterial solution on cadmium-contaminated soil using two lawn plants through pot experiments, as well as the impact on the soil microbial community structure. The results demonstrate that Bacillus cereus promotes plant growth, and the combined action of lawn plants and Bacillus cereus improves soil quality, enhancing the bioavailability of cadmium in the soil. At a bacterial suspension concentration of 105 CFU/mL, the optimal remediation treatment was observed. The removal efficiency of cadmium in the soil under Festuca arundinacea and Poa pratensis treatments reached 33.69% and 33.33%, respectively. Additionally, the content of bioavailable cadmium in the rhizosphere soil increased by up to 13.43% and 26.54%, respectively. Bacillus cereus increased the bacterial diversity in the non-rhizosphere soil of both lawn plants but reduced it in the rhizosphere soil. Additionally, the relative abundance of Actinobacteriota and Firmicutes, which have potential for heavy metal remediation, increased after the application of the bacterial solution. This study demonstrates that Bacillus cereus can enhance the potential of lawn plants to remediate cadmium-contaminated soil and reshape the microbial communities in both rhizosphere and non-rhizosphere soils.

show abstract

Bacterial extracellular polymeric substances: Impact on soil microbial community composition and their potential role in heavy metal-contaminated soil

Cited by 16 publications

References 63 publications

Assessment of the Pollution of Soil Heavy Metal(loid)s and Its Relation with Soil Microorganisms in Wetland Soils

Assessment of the Pollution of Soil Heavy Metal(loid)s and Its Relation with Soil Microorganisms in Wetland Soils

Combination of Biochar and Trichoderma harzianum Can Improve the Phytoremediation Efficiency of Brassica juncea and the Rhizosphere Micro-Ecology in Cadmium and Arsenic Contaminated Soil

Microbiological Mechanisms of Collaborative Remediation of Cadmium-Contaminated Soil with Bacillus cereus and Lawn Plants

Contact Info

Product

Resources

About