The impact of stabilizing amendments on the microbial community and metabolism in cadmium-contaminated paddy soils

Chen, Yi; Chen, FangFang; Xie, Min; Jiang, Qijie; Chen, Wenqing; Ao, Tianqi

doi:10.1016/j.cej.2020.125132

Cited by 36 publications

(8 citation statements)

References 76 publications

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“…Gemmatimonas and Nocardioides were widely identified in metal-impacted environments and tolerated elevated levels of Cd ( Abdulla, 2009 ; Hu et al, 2021 ). These facts indicate the potential that elevated Cd levels not only regulate the enrichment of microorganisms with microbial nitrogen fixation functions to alleviate soil N but also mobilize Cd from the rhizosphere soil, which is consistent with previous studies ( Chen Y. et al, 2020 ). Similar to nitrogen fixation genes, genes associated with microbial functions involving P solubilization, including glpA (K00111), gcd (K00117), gcdH (K00252), and ppaX (K06019), were more highly enriched in the AE than that in the NAE rhizosphere soils.…”

Section: Discussionsupporting

confidence: 92%

“…Microbial P solubilization converts insoluble phosphates into available P forms by secreting a variety of organic acids to promote host fitness in P-limited environments ( Brucker et al, 2020 ). Importantly, microbial P solubilization was also reported to mobilize Cd from soils by increasing the soil acidity ( Chen Y. et al, 2020 ). The microbial P solubilization gene is widely distributed in microbes in Cd-contaminated environments ( Zuniga-Silva et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

“…Recently, several studies targeting the rhizosphere microbiome have shown that many rhizosphere microbes from the AE of S. alfredii can be characterized as Cd resistant and improve the efficiency of Cd uptake in soils with high Cd contents ( Hou et al, 2018 ). Furthermore, other studies have demonstrated that the rhizosphere microbiome can facilitate growth of the AE of S. alfredii through its involvement in indole acetic acid (IAA), aminocyclopropane carboxylic acid (ACC), and nutrient metabolism under high-Cd conditions ( Chen Y. et al, 2020 ). These studies have shown that the rhizosphere microbiome may play an important role in coordinating Cd uptake and growth in S. alfredii in soils under Cd stress.…”

Section: Introductionmentioning

confidence: 99%

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The rhizosphere microbiome improves the adaptive capabilities of plants under high soil cadmium conditions

Fan

Deng²,

Shao³

et al. 2022

Front. Plant Sci.

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Cadmium (Cd) contamination of agricultural soils poses a potential public health issue for humans. Phytoremediation-based accumulating plants are an effective and sustainable technology for Cadmium remediation of contaminated agricultural soil. The rhizosphere microbiome can promote the growth and Cadmium accumulation in hyperaccumulators, but its taxonomic and functional traits remain elusive. The present study used two ecotypes of Sedum alfredii, an accumulating ecotype (AE) and a non-accumulating ecotype (NAE), as model plants to investigate the rhizosphere microbiome assemblages and influence on plant growth under high cadmium conditions. Our results showed that distinct root microbiomes assembled in association with both ecotypes of S. alfredii and that the assemblages were based largely on the lifestyles of the two ecotypes. In addition, we demonstrated that the functions of the microbes inhabiting the rhizosphere soils were closely associated with root-microbe interactions in both ecotypes of S. alfredii. Importantly, our results also demonstrated that the rhizosphere microbiome assembled in the AE rhizosphere soils contributed to plant growth and cadmium uptake under high cadmium conditions through functions such as nitrogen fixation, phosphorus solubilization, indole acetic acid (IAA) synthesis, and siderophore metabolism. However, this phenomenon was not clearly observed in the NAE. Our results suggest that the rhizosphere microbiome plays important roles in biogeochemical nutrient and metal cycling that can contribute to host plant fitness.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The rhizosphere microbiome improves the adaptive capabilities of plants under high soil cadmium conditions

Fan

Deng²,

Shao³

et al. 2022

Front. Plant Sci.

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“…The combined application of IMOs and n-HAP exhibited synergistically decreased DTPA-extractable Cd and Pb concentrations in slightly contaminated soil; however, no synergistic effect was observed in moderately contaminated soil. Some studies have revealed that stabilising amendments in the heavy-metal-polluted soil aided the recovery of soil bacterial diversity and soil microbial metabolic activities related to Cd and Pb transformation and enriched genera related to nutrient activation, particularly at low metal concentrations [ 68 , 69 , 70 , 71 ]. Our results suggest that n-HAP, along with several taxa, may improve the immobilisation efficiencies of DTPA-extractable Cd and Pb in slightly contaminated soil, whereas IMOs from moderately contaminated soil developed many strains tolerant to HMs, thereby activating the available Cd in moderately contaminated soil.…”

Section: Discussionmentioning

confidence: 99%

Effects of Amendments and Indigenous Microorganisms on the Growth and Cd and Pb Uptake of Coriander (Coriandrum sativum L.) in Heavy Metal-Contaminated Soils

Wen-ying

Zhou

et al. 2022

Toxics

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Heavy metal (HM) contamination of soils is a worldwide problem with adverse consequences to the environment and human health. For the safe production of vegetables in contaminated soil, efficient soil amendments need to be applied such as nano-hydroxyapatite (n-HAP) and poly γ-glutamic acid (γ-PGA), which can mitigate heavy metal uptake and enhance crop yield. However, the combined effects of soil amendments and indigenous microorganisms (IMOs) on HMs immobilisation and accumulation by crops have received little attention. We established a pot experiment to investigate the effects of IMOs combined with n-HAP and γ-PGA on coriander (Coriandrum sativum L.) growth and its Cd and Pb uptake in two acidic soils contaminated with HMs. The study demonstrated that applying n-HAP, with and without IMOs, significantly increased shoot dry biomass and reduced plant Cd and Pb uptake and diethylenetriaminepentaacetic acid (DTPA) extractable Cd and Pb concentrations in most cases. However, γ-PGA, with and without IMOs, only reduced soil DTPA-extractable Pb concentrations in slightly contaminated soil with 0.29 mg/kg Cd and 50.9 mg/kg Pb. Regardless of amendments, IMOs independently increased shoot dry biomass and soil DTPA-extractable Cd concentrations in moderately contaminated soil with 1.08 mg/kg Cd and 100.0 mg/kg Pb. A synergistic effect was observed with a combined IMOs and n-HAP treatment, where DTPA-extractable Cd and Pb concentrations decreased in slightly contaminated soil compared with the independent IMOs and n-HAP treatments. The combined treatment of γ-PGA and IMOs substantially increased shoot dry biomass in moderately contaminated soil. These results indicate that solo n-HAP enhanced plant growth and soil Cd and Pb immobilisation, and mitigated Cd and Pb accumulation in shoots. However, the combination of n-HAP and IMOs was optimal for stabilising and reducing HMs’ uptake and promoting plant growth in contaminated soil, suggesting its potential for safe crop production.

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“…On the 40th day, the EC of the soil with NMMT applied at a rate of 0.5% was significantly lower than that of the non-amended sample. Soil salinity may affect the bioavailability and absorption of heavy metals in the soil because soil salinity and related biological stress may affect the ultimate demand for optimal plant growth and may have a synergistic/antagonistic effect with heavy metals (Chen et al, 2020). Raiesi and Sadeghi (2019) reported that the bioavailability of lead was significantly positively correlated with the increase in soil salinity.…”

Section: Changes In Soil Ph and Ecmentioning

confidence: 99%

Physicochemical Properties, Metal Availability, and Bacterial Community Structure in Cadmium-Contaminated Soil Immobilized by Nano-Montmorillonite

Liu

Zhao

Yuan

et al. 2022

Front. Environ. Sci.

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Montmorillonite has been widely used in remediation of toxic metals. However, for the safety of the soil ecosystem, the impact of this technology on microorganisms is still unclear. Here, the influence of nano-montmorillonite on immobilization, accumulation of cadmium, and microbial activity in a soil–plant system was investigated. The results revealed that the nano-montmorillonite treatments reduced cadmium bioavailability and the uptake by oilseed rape. It was found that the addition of NMMT reduced the toxicity of Cd on soil microorganisms and improved enzyme activity. The nano-montmorillonite stimulated the relative abundance of Proteobacteria that was closely related to nutrient turnover in soil. In addition, the treatment with 0.5% addition of nano-montmorillonite significantly improved the microbial alpha diversity index and enhanced the relative abundance of Bacteroidetes and Planctomycetes. Thus, certain soil quality recovery occurred after the application of nano-montmorillonite. To successfully combine remediation and microbial effects, 0.5% nano-montmorillonite was recommended to be added to cadmium-contaminated soil to minimize the additional impact on the soil ecosystem.

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The impact of stabilizing amendments on the microbial community and metabolism in cadmium-contaminated paddy soils

Cited by 36 publications

References 76 publications

The rhizosphere microbiome improves the adaptive capabilities of plants under high soil cadmium conditions

The rhizosphere microbiome improves the adaptive capabilities of plants under high soil cadmium conditions

Effects of Amendments and Indigenous Microorganisms on the Growth and Cd and Pb Uptake of Coriander (Coriandrum sativum L.) in Heavy Metal-Contaminated Soils

Physicochemical Properties, Metal Availability, and Bacterial Community Structure in Cadmium-Contaminated Soil Immobilized by Nano-Montmorillonite

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