Post-reclamation microbial diversity and functions in hexachlorocyclohexane (HCH) contaminated soil in relation to spontaneous HCH tolerant vegetation

Balàzs, Helga E.; Schmid, Christoph; Cruzeiro, Catarina; Podar, Dorina; Szatmari, Paul-Marian; Buegger, Franz; Hufnagel, Gudrun; Radl, Viviane; Schröder, Peter

doi:10.1016/j.scitotenv.2020.144653

Cited by 19 publications

(8 citation statements)

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“…Unique fungal diversity was identified in various HM-contaminated sites [ 24 , 31 , 43 , 44 , 87 , 88 ]. Similar investigations on bacterial populations reflect the same results [ 56 , 89 , 90 , 91 ]. These studies emphasize the need to investigate and make use of microorganism consortia adapted to the particular conditions of each location.…”

Section: Discussionsupporting

confidence: 85%

“…The study site is located at a former chloralkali plant (N = 46.557192°, E = 23.781689°) in Turda, Cluj County, Romania, in the vicinity of the Arieș river basin [ 55 , 56 ] ( Figure 1 ). The site was chosen for its historical Hg contamination—about 50 years of activity—since Hg was used at the cloralkali plant from 1958 as a cathode in the process of NaCl/KCl electrolysis to obtain NaOH/KOH and chlorine.…”

Section: Methodsmentioning

confidence: 99%

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Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Văcar

Covaci

Chakraborty

et al. 2021

JoF

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Filamentous fungi native to heavy metals (HMs) contaminated sites have great potential for bioremediation, yet are still often underexploited. This research aimed to assess the HMs resistance and Hg remediation capacity of fungi isolated from the rhizosphere of plants resident on highly Hg-contaminated substrate. Analysis of Hg, Pb, Cu, Zn, and Cd concentrations by X-ray spectrometry generated the ecological risk of the rhizosphere soil. A total of 32 HM-resistant fungal isolates were molecularly identified. Their resistance spectrum for the investigated elements was characterized by tolerance indices (TIs) and minimum inhibitory concentrations (MICs). Clustering analysis of TIs was coupled with isolates’ phylogeny to evaluate HMs resistance patterns. The bioremediation potential of five isolates’ live biomasses, in 100 mg/L Hg2+ aqueous solution over 48 h at 120 r/min, was quantified by atomic absorption spectrometry. New species or genera that were previously unrelated to Hg-contaminated substrates were identified. Ascomycota representatives were common, diverse, and exhibited varied HMs resistance spectra, especially towards the elements with ecological risk, in contrast to Mucoromycota-recovered isolates. HMs resistance patterns were similar within phylogenetically related clades, although isolate specific resistance occurred. Cladosporium sp., Didymella glomerata, Fusarium oxysporum, Phoma costaricensis, and Sarocladium kiliense isolates displayed very high MIC (mg/L) for Hg (140–200), in addition to Pb (1568), Cu (381), Zn (2092–2353), or Cd (337). The Hg biosorption capacity of these highly Hg-resistant species ranged from 33.8 to 54.9 mg/g dry weight, with a removal capacity from 47% to 97%. Thus, the fungi identified herein showed great potential as bioremediators for highly Hg-contaminated aqueous substrates.

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Section: Discussionsupporting

confidence: 85%

Section: Methodsmentioning

confidence: 99%

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Văcar

Covaci

Chakraborty

et al. 2021

JoF

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“…Moreover, some beneficial prokaryotic genera exhibited their highest relative abundances (RAs) in the HGO 5 @CMlrA treatment compared to the other three treatments ( Figure 7 D). These taxa included Acidovorax which can degrade chlorobenzenes, diazotrophs ( Ideonella and Allorhizobium-Neorhizobium-Pararhizobium-Rhizobium ), Dechloromonas, and Polynucleobacter that can remove phosphorus, and Sphaerotilus that can remove heavy metals such as chromium and copper ( Figure 7 E(top)) ( Monferran et al., 2005 ; Balázs et al., 2021 ; Petriglieri et al., 2021 ). In contrast, these beneficial genera exhibited low RAs in the other three treatment communities, indicating that the immobilization of CMlrA on HGO 5 can lead to safer aquatic microcosm conditions ( Figure 7 E(top)).…”

Section: Resultsmentioning

confidence: 99%

Strain-boosted hyperoxic graphene oxide efficiently loading and improving performances of microcystinase

et al. 2022

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“…For example, Allorhizobium-Neorhizobium-Pararhizobium-Rhizobium is a plant-growth-promoting clade involved in nitrogen assimilation processes in the rhizosphere and endosphere, shows hypersensitive response to environmental contaminants, and exhibits high resistance against abiotic stress induced by xenobiotics. 62,63 In the presence of heavy metals, Streptomyces within the class of Actinobacteria could directly increase plant growth by stimulating the uptake of essential mineral nutrients, accelerating phytohormone biosynthesis, and sequestering heavy metals by secreting extracellular polymeric substances (EPS) and chelation agents such as siderophores and hydroxamates. 64,65 Tepidisphaera is a genus composed of moderately thermophilic, facultatively aerobic cocci that occur as single cells or shapeless aggregates.…”

Section: Effects Of G-c 3 N 4 Onmentioning

confidence: 99%

Root Exposure of Graphitic Carbon Nitride (g-C₃N₄) Modulates Metabolite Profile and Endophytic Bacterial Community to Alleviate Cadmium- and Arsenate-Induced Phytotoxicity to Rice (Oryza sativa L.)

Hao,

Cai,

et al. 2023

ACS Nano

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To investigate the mechanisms by which g-C3N4 alleviates metal(loid)-induced phytotoxicity, rice seedlings were exposed to 100 and 250 mg/kg graphitic carbon nitride (g-C3N4) with or without coexposure to 10 mg/kg Cd and 50 mg/kg As for 30 days. Treatment with 250 mg/kg g-C3N4 significantly increased shoot and root fresh weight by 22.4–29.9%, reduced Cd and As accumulations in rice tissues by 20.6–26.6%, and elevated the content of essential nutrients (e.g., K, S, Mg, Cu, and Zn) compared to untreated controls. High-throughput sequencing showed that g-C3N4 treatment increased the proportion of plant-growth-promoting endophytic bacteria, including Streptomyces, Saccharimonadales, and Thermosporothrix, by 0.5–3.30-fold; these groups are known to be important to plant nutrient assimilation, as well as metal(loid) resistance and bioremediation. In addition, the population of Deinococcus was decreased by 72.3%; this genus is known to induce biotransformation As(V) to As(III). Metabolomics analyses highlighted differentially expressed metabolites (DEMs) involved in the metabolism of tyrosine metabolism, pyrimidines, and purines, as well as phenylpropanoid biosynthesis related to Cd/As-induced phytotoxicity. In the phenylpropanoid biosynthesis pathway, the increased expression of 4-coumarate (1.13-fold) and sinapyl alcohol (1.26-fold) triggered by g-C3N4 coexposure with Cd or As played a critical role in promoting plant growth and enhancing rice resistance against metal(loid) stresses. Our findings demonstrate the potential of g-C3N4 to enhance plant growth and minimize the Cd/As-induced toxicity in rice and provide a promising nanoenabled strategy for remediating heavy metal(loid)-contaminated soil.

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Post-reclamation microbial diversity and functions in hexachlorocyclohexane (HCH) contaminated soil in relation to spontaneous HCH tolerant vegetation

Cited by 19 publications

References 71 publications

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Strain-boosted hyperoxic graphene oxide efficiently loading and improving performances of microcystinase

Root Exposure of Graphitic Carbon Nitride (g-C₃N₄) Modulates Metabolite Profile and Endophytic Bacterial Community to Alleviate Cadmium- and Arsenate-Induced Phytotoxicity to Rice (Oryza sativa L.)

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Post-reclamation microbial diversity and functions in hexachlorocyclohexane (HCH) contaminated soil in relation to spontaneous HCH tolerant vegetation

Cited by 19 publications

References 71 publications

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Strain-boosted hyperoxic graphene oxide efficiently loading and improving performances of microcystinase

Root Exposure of Graphitic Carbon Nitride (g-C3N4) Modulates Metabolite Profile and Endophytic Bacterial Community to Alleviate Cadmium- and Arsenate-Induced Phytotoxicity to Rice (Oryza sativa L.)

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Product

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Root Exposure of Graphitic Carbon Nitride (g-C₃N₄) Modulates Metabolite Profile and Endophytic Bacterial Community to Alleviate Cadmium- and Arsenate-Induced Phytotoxicity to Rice (Oryza sativa L.)