Heavy metal tolerance of bacterial isolates associated with overburden strata of an opencast coal mine of Assam (India)

Singh, Khomdram Niren; Narzary, Diganta

doi:10.1007/s11356-021-15153-1

Cited by 11 publications

(4 citation statements)

References 67 publications

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“…Proteobacteria are typically observed in soil libraries 61 . Proteobacteria and Actinobacteria are also the most abundant in soils worldwide 62 , and can survive under various extreme environmental conditions, such as cold stress, drought, and heavy metal contamination 63 , 64 . Proteobacteria, Acidobacteria, and Actinobacteria are the most common and abundant bacterial phyla in a wide range of forest soils 61 .…”

Section: Resultsmentioning

confidence: 99%

Low-density polyethylene microplastics alter chemical properties and microbial communities in agricultural soil

Palansooriya,

Sang,

El-Naggar

et al. 2023

Sci Rep

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Microplastic (MP) pollution in agricultural soils, resulting from the use of plastic mulch, compost, and sewage sludge, jeopardizes the soil microbial populations. However, the effects of MPs on soil chemical properties and microbial communities remain largely unknown. Here, we investigated the effects of different concentration levels (0, 0.1, 1, 3, 5, and 7%; w:w) of low-density polyethylene (LDPE) MPs on the chemical properties and bacterial communities of agricultural soil in an incubation study. The addition of LDPE MPs did not drastically change soil pH (ranging from 8.22 to 8.42). Electrical conductivity increased significantly when the LDPE MP concentrations were between 1 and 7%, whereas the total exchangeable cations (Na+, K+, Mg2+, and Ca2+) decreased significantly at higher LDPE MP concentrations (3–7%). The highest available phosphorus content (2.13 mg kg−1) was observed in 0.1% LDPE MP. Bacterial richness (Chao1 and Ace indices) was the lowest at 0.1% LDPE MP, and diversity indices (Shannon and Invsimpson) were higher at 0 and 1% LDPE MP than at other concentrations. The effect of LDPE MP concentrations on bacterial phyla remained unchanged, but the bacterial abundance varied. The relative abundance of Proteobacteria (25.8–33.0%) was the highest in all treatments. The abundance of Acidobacteria (15.8–17.2%) was also high, particularly in the 0, 0.1, and 1% LDPE MPs. With the increase in LDPE MP concentration, the abundance of Actinobacteria gradually increased from 7.80 to 31.8%. Our findings suggest that different MP concentration levels considerably alter soil chemical properties and microbial composition, which may potentially change the ecological functions of soil ecosystems.

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Section: Resultsmentioning

confidence: 99%

Low-density polyethylene microplastics alter chemical properties and microbial communities in agricultural soil

Palansooriya,

Sang,

El-Naggar

et al. 2023

Sci Rep

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“…A previous study showed that Amycolatopsis exhibited possible tolerance to both acid soils and the presence of certain metals (As, Cr, and Ni) [ 8 ]. Other genera, such as Actinoplanes [ 77 ], Pajaroellobacter [ 78 ], and Pseudarthrobacter [ 79 ], were also observed to occur in heavy metal-contaminated soils. The enrichment of these microorganisms by HAP indicates their potential use in soil remediation jointly with HAP.…”

Section: Discussionmentioning

confidence: 99%

Remediation Agents Drive Bacterial Community in a Cd-Contaminated Soil

Cui

Liu

et al. 2023

Toxics

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Soil remediation agents (SRAs) such as biochar and hydroxyapatite (HAP) have shown a promising prospect in in situ soil remediation programs and safe crop production. However, the effects of SRAs on soil microbial communities still remain unclear, particularly under field conditions. Here, a field case study was conducted to compare the effects of biochar and HAP on soil bacterial communities in a slightly Cd-contaminated farmland grown with sweet sorghum of different planting densities. We found that both biochar and HAP decreased the diversity and richness of soil bacteria, but they differently altered bacterial community structure. Biochar decreased Chao1 (−7.3%), Observed_species (−8.6%), and Shannon indexes (−1.3%), and HAP caused Shannon (−2.0%) and Simpson indexes (−0.1%) to decline. The relative abundance (RA) of some specific taxa and marker species was differently changed by biochar and HAP. Overall, sweet sorghum cultivation did not significantly alter soil bacterial diversity and richness but caused changes in the RA of some taxa. Some significant correlations were observed between soil properties and bacterial abundance. In conclusion, soil remediation with biochar and HAP caused alterations in soil bacterial communities. Our findings help to understand the ecological impacts of SRAs in soil remediation programs.

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“…Compared with the treatment group, the content of Firmicutes decreased rapidly in the control from days 1 to 7 and kept a steady status with a slight decrease from days 7 to 28, the highest proportion was 83.71%. Firmicutes was previously reported to be present in the uranium exposure environment [23]. By adding a carbon source into an in situ leaching uranium mine, Ding et al [24] found that Firmicutes (>70%) was dominant in the sediment.…”

Section: Microbial Community Composition Analysis At Phylum Levelmentioning

confidence: 97%

Response and Dynamic Change of Microbial Community during Bioremediation of Uranium Tailings by Bacillus sp.

Tang

Zhong

et al. 2021

Minerals

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Bacillus sp. is widely used in the remediation of uranium-contaminated sites. However, little is known about the competitive process of microbial community in the environment during bioremediation. The bioremediation of uranium tailings using Bacillus sp. was explored, and the bacterial community was analyzed by high-throughput sequencing at different stages of remediation. Bacillus sp. reduced the leaching of uranium from uranium tailings. The lowest uranium concentration was 17.25 μg/L. Alpha diversity revealed that the abundance and diversity of microorganisms increased with the extension of the culture time. The microbial abundance and diversity were higher in the treatment group than in the control group. The dominant species at the phyla level were Firmicutes and Proteobacteria in the uranium tailings environment, whereas the phylum of Proteobacteria was significantly increased in the treatment group. Based on the genus level, the proportions of Arthrobacter, Rhodococcus and Paenarthrobacter decreased significantly, whereas those of Clostridium sp., Bacillus and Pseudomonas increased dramatically. Hence, the remediation of uranium contamination in the environment was due to the functional microorganisms, which gradually became the dominant strain in the treatment, such as Desulfotomaculum, Desulfosporporosinus, Anaerocolumna, Ruminiclostridium and Burkholderia. These findings provided a promising outlook of the potential for remediation strategies of soil contaminated by uranium. The dynamic characteristics of the microbial community are likely to provide a foundation for the bioremediation process in practice.

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Heavy metal tolerance of bacterial isolates associated with overburden strata of an opencast coal mine of Assam (India)

Cited by 11 publications

References 67 publications

Low-density polyethylene microplastics alter chemical properties and microbial communities in agricultural soil

Low-density polyethylene microplastics alter chemical properties and microbial communities in agricultural soil

Remediation Agents Drive Bacterial Community in a Cd-Contaminated Soil

Response and Dynamic Change of Microbial Community during Bioremediation of Uranium Tailings by Bacillus sp.

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