Deciphering soil amendments and actinomycetes for remediation of cadmium (Cd) contaminated farmland

Xu, Tengqi; Xi, Jianchao; Ke, Jihong; Wang, Yufan; Chen, Xiaotian; Zhang, Zengqiang; Lin, Yanbing

doi:10.1016/j.ecoenv.2022.114388

Cited by 16 publications

(10 citation statements)

References 72 publications

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“…A previous study has shown that Cd stress increased SOD activity in L. perenne , and the increase of SOD activity functions to alleviate the toxic effects of Cd on L. perenne by removing the excess ROS [ 38 , 51 ]. There was a significant increase in SOD activity in soil inoculated with wheat leaves, while actinomycetes application could further enhance SOD activity [ 52 ]. Lactobacillus plantarum/acidophilus/rhamnosus treatment also promoted the activity of SOD in leaves of Brassica juncea compared to control [ 53 ].…”

Section: Discussionmentioning

confidence: 99%

Cadmium-Tolerant Bacterium Strain Cdb8-1 Contributed to the Remediation of Cadmium Pollution through Increasing the Growth and Cadmium Uptake of Chinese Milk Vetch (Astragalus sinicus L.) in Cadmium-Polluted Soils

Wang,

Sun,

Wang

et al. 2023

Plants

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Cadmium (Cd) pollution has attracted global attention because it not only jeopardizes soil microbial ecology and crop production, but also threatens human health. As of now, microbe-assisted phytoremediation has proven to be a promising approach for the revegetation of Cd-contaminated soil. Therefore, it is important to find such tolerant microorganisms. In the present study, we inoculated a bacteria strain tolerant to Cd, Cdb8-1, to Cd-contaminated soils and then explored the effects of Cdb8-1 inoculation on the performance of the Chinese milk vetch. The results showed plant height, root length, and fresh and dry weight of Chinese milk vetch grown in Cdb8-1-inoculated soils increased compared to the non-inoculated control group. The inoculation of Cd-contaminated soils with Cdb8-1 also enhanced their antioxidant defense system and decreased the H2O2 and malondialdehyde (MDA) contents, which alleviated the phytotoxicity of Cd. The inoculation of Cdb8-1 in Cd-contaminated soils attenuated the contents of total and available Cd in the soil and augmented the BCF and TF of Chinese milk vetch, indicating that the combined application of Cd-tolerant bacteria Cdb8-1 and Chinese milk vetch is a potential solution to Cd-contaminated soils.

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Section: Discussionmentioning

confidence: 99%

Cadmium-Tolerant Bacterium Strain Cdb8-1 Contributed to the Remediation of Cadmium Pollution through Increasing the Growth and Cadmium Uptake of Chinese Milk Vetch (Astragalus sinicus L.) in Cadmium-Polluted Soils

Wang,

Sun,

Wang

et al. 2023

Plants

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“…Nevertheless, a notable increase in the proportion of positive links was observed in bacterial inoculant groups, the observed elevation in positive linkages implies a reduction in competitive forces and a simultaneous strengthening of synergistic interactions among microorganisms, underscoring the e cacy of the intervention in shaping microbial networks. This phenomenon can be attributed to the enhancement of soil microbial functions and interactions through the inoculation of PGPB (Xu et al 2023). The intricate microbial network becomes less susceptible to external stresses and enlists the aid of highly e cacious PGPB to safeguard the inter-root microecological environment of plants, thereby bolstering their resilience against external stressors and promoting natural growth (Tao et al 2020).…”

Section: Enterobacteriaceae Inoculant Shifted the Soil Microecologica...mentioning

confidence: 99%

“…A study by Hou et al(Hou et al 2019) demonstrated that the intensity and activity of microbial interactions are critical determinants of the complexity of co-occurrence networks. The identi cation and characterization of cooperative and competitive microbial interactions, as well as the determination of network modularity, are crucial for understanding the stability of microbial communities in response to various environmental factors(Xu et al 2023). The results obtained through network analysis indicate that microbial networks…”

mentioning

confidence: 99%

Two microbes assisting Miscanthus floridulus in remediating multi-metal(loid)s-contaminated soil

Xiao,

Ma,

Chen

et al. 2024

Environ Sci Pollut Res

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Miscanthus has good tolerance to muti-metal(loid)s and has received increasing attention in remediated studies of metal(loid)s-contaminated soil. In this study, we explored the synergic effects of Miscanthus oridulus (Lab.) and two plant growth-promoting bacteria (PGPB), TS8 and MR2, a liated to Enterobacteriaceae on remediation of muti-metal(loid)s contaminated soil. The results exhibited a decrease of metal(loid)s except for copper contents in the soil in bacterial inoculation groups, indicating that MR2 and TS8 could enhance the remediation of metal(loid)s. Moreover, increased fresh/dry weight and height indicated that inoculated bacteria could promote Miscanthus growth. Although the activities of antioxidant enzymes and the content of chlorophyll in the overground tissues showed no signi cant increase or even decrease, the activities of antioxidant enzymes in the underground tissues and soil, as well as the contents of soil nutrients (available K and P), were signi cantly (p < 0.05) increased to some certain. Bacterial inoculants could also decrease the soil pH. High-throughput sequencing analysis showed that the bacterial inoculant affected the rhizosphere bacterial community and reduced community diversity, but the relative abundance of some PGPB were found to increase. Phylogenetic molecular ecological networks indicated that bacterial inoculants reduced interactions between rhizosphere bacteria and thereby led to a simpler network structure but increased the proportion of positive-correlation links and enhanced the metabiosis and symbiosis of those bacteria. Spearman's test showed that OTUs a liated with Enterobacteriaceae and soil nutrients were critical for metal(loid) remediation and Miscanthus growth. The results of this study provide a basis for the synergic remediation of muti-metal(loid)s-contaminated soils by Miscanthus and PGPB and provide a reference for the subsequent regulation of Miscanthus remediation e ciency by the other PGPB or critical bacteria.

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“…Moreover, incorporating actinomycetes into the system enhances the complexity of the microbial network structure and strengthens the stability of the microecology around the plant's roots. Additionally, the combined application of soil amendments and actinomycetes can promote plant growth (Hamid et al, 2021;Xu et al, 2023).…”

Section: Isolation and Identification Of Actinomycetesmentioning

confidence: 99%

Geospatial evaluation and bio-remediation of heavy metal-contaminated soils in arid zones

Mohamed,

Jalhoum,

Hendawy

et al. 2024

Front. Environ. Sci.

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Introduction: Soil pollution directly impacts food quality and the lives of both humans and animals. The concentration of heavy metals in Egypt’s drain-side soils is rising, which is detrimental to the quality of the soil and crops. The key to reducing the detrimental effects on the ecosystem is having accurate maps of the spatial distribution of heavy metals and the subsequent use of environmentally sustainable remediation approaches. The objective of this work is to assess soil contamination utilizing spatial mapping of heavy metals, determine contamination levels using Principal Component Analysis (PCA), and calculate both the contamination severity and the potential for bioremediation in the soils surrounding the main drain of Bahr El-Baqar. Furthermore, evaluating the capacity of microorganisms (bacteria, fungi, and “Actinomycetes) to degrade heavy elements in the soil.Methodology: 146 soil sample locations were randomly selected near the Bahr El-Baqar drain to examine the degree of soil pollution Ordinary Kriging (OK), method was used to map and analyze the spatial distribution of soil contamination by seven heavy metals (Cr, Fe, Zn, Cd, Pb, As, and Ni). Modified contamination degree (mCd) and PCA were used to assess the research area’s soil pollution levels. The process involved isolating, identifying, and classifying the microorganisms present in the soil of the study area. The study findings showed that variography suggested the Stable model effectively matched pH, SOM, and Cd values. Furthermore, the exponential model proved suitable for predicting Fe, Pb and Ni, while the spherical model was appropriate for Ni, Cr, and Zn.Results: The study revealed three levels of contamination, with an extremely high degree (EHDC) affecting approximately 97.49% of the area. The EHDC exhibited average concentrations of heavy metals: 79.23 ± 17.81 for Cr, 20,014.08 ± 4545.91 for Fe, 201.31 ± 112.97 for Zn, 1.33 ± 1.37 for Cd, 40.96 ± 26.36 for Pb, 211.47 ± 13.96 for As, and 46.15 ± 9.72 for Ni. Isolation and identification of microorganisms showed a significant influence on the breakdown of both organic and inorganic pollutants in the environment. The study demonstrated exceptionally high removal efficiency for As and Cr, with a removal efficiency reached 100%, achieved by Rhizopus oryzae, Pseudomonas aeruginosa, and Bacillus thuringiensis.Conclusion: This study has designated management zones for soil contamination by mapping soil pollutants, geo-identified them, and found potential microorganisms that could significantly reduce soil pollution levels.

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Deciphering soil amendments and actinomycetes for remediation of cadmium (Cd) contaminated farmland

Cited by 16 publications

References 72 publications

Cadmium-Tolerant Bacterium Strain Cdb8-1 Contributed to the Remediation of Cadmium Pollution through Increasing the Growth and Cadmium Uptake of Chinese Milk Vetch (Astragalus sinicus L.) in Cadmium-Polluted Soils

Cadmium-Tolerant Bacterium Strain Cdb8-1 Contributed to the Remediation of Cadmium Pollution through Increasing the Growth and Cadmium Uptake of Chinese Milk Vetch (Astragalus sinicus L.) in Cadmium-Polluted Soils

Two microbes assisting Miscanthus floridulus in remediating multi-metal(loid)s-contaminated soil

Geospatial evaluation and bio-remediation of heavy metal-contaminated soils in arid zones

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