Improved arsenic phytoextraction by combined use of mobilizing chemicals and autochthonous soil bacteria

Franchi, Elisabetta; Cosmina, Paola; Pedron, Francesca; Rosellini, Irene; Barbafieri, Meri; Petruzzelli, G.; Vocciante, Marco

doi:10.1016/j.scitotenv.2018.11.242

Cited by 58 publications

(25 citation statements)

References 55 publications

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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%

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Văcar

Covaci

Chakraborty

et al. 2021

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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%

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Văcar

Covaci

Chakraborty

et al. 2021

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“…In contrast, on the basis of our findings, nGOx emerge as a potential additive that can increase As mobility. This capacity opens up the possibility to enhance phytoextraction strategies in As-polluted soils by means of plant species such as Pteris vittata, Brassica juncea, Helianthus annuus or Zea mays 43,44 . From an economic point of view, the process should be addressed taking into account the cost of nGOx.…”

Section: Discussionmentioning

confidence: 99%

Nanoremediation of As and metals polluted soils by means of graphene oxide nanoparticles

Baragaño

Forján

Welte

et al. 2020

Sci Rep

110

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the capacity of graphene oxide nanoparticles (nGox) to reduce or increase As and metals availability in polluted soils was compared with that of zero valent iron nanoparticles (nZVi). the nanomaterials used in this study were characterized by X-ray techniques, cHnS-o analysis, dynamic light scattering, and microscopy procedures such as atomic force microscopy. to assess the capacity of these materials to immobilize pollutants, field samples of two soils were treated with nZVI and nGOx at a range of doses (0.2%, 1% and 5%). Availability tests were then performed. nGOx effectively immobilized Cu, Pb and cd, but mobilized As and p (even at low doses), in the latter case irrespective of the simultaneous presence of high concentrations of metals. in turn, nZVi promoted notable immobilization results for As and pb, a poorer result for cd, and an increased availability for cu. Soil pH and ec have been slightly affected by nGOx. On the whole, nGOx emerges as a promising option for mobilization/immobilization strategies for soil nanoremediation when combined with other techniques such as phytoremediation. Industrial activities have released large amounts of metals (Cu, Cd, Pb, Zn, etc.) and metalloids (especially As) into the environment and caused serious damage to the ecosystem 1. In addition, metals and metalloids can endanger human health, as many of them are toxic even at very low concentrations, and even carcinogenic (e.g. As) and mutagenic 2. Unlike organic pollutants that can degrade into harmless small molecules, the abovementioned inorganic pollutants are recalcitrant to many biochemical reactions and thus particularly difficult to remove from soils 3. Regarding As, several studies have confirmed that between 52,000 and 112,000 tons of this metalloid are released into the environment every year 1,4,5. Many diseases, such as lung cancer, skin cancer, bladder cancer, etc., can be caused by contact with As 6,7. Given that As is highly toxic for humans, and also for plants and animals, it has been classified as a priority hazardous pollutant. Unlike the aforementioned metals, As is an anionic contaminant. In this regard, simultaneous remediation of soils affected by anionic and cationic contaminants is a challenge 8 ; i.e., As remediation is even more complex in contexts of concurrent pollution with metals. In fact, classical remediation approaches attempt, among other objectives, to raise the pH of soils contaminated with cationic metals and thus stabilize them. However, this approach causes As to be solubilized 9. Overall, the various remediation strategies available focus on the disjuncture between immobilization and mobilization of the pollutants 10. Soil nanoremediation by means of Fe-nanoparticles (nZVI) simultaneously reduces the availability of As and metals in polluted soils, as shown in recent pilot-scale in situ trials 11 , and by means of hybrid soil-washing techniques 12. nZVI have a Fe° core surrounded by an oxide/hydroxide shell, which grows thicker as iron oxidation progresses. In addition, nZVI pres...

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“…About twenty phenotypically different colonies for each root type were isolated and pure cultures were used for DNA extraction and taxonomic classification as already described in Franchi et al [23].…”

Section: Endophyte Isolationmentioning

confidence: 99%

“…Among the various assisted-phytoextraction approaches to maximize the technique's effectiveness, an exciting alternative is the use of plant growth-promoting rhizobacteria (PGPR) [22]. This strategy involves rhizobacteria that can stimulate plant growth by both facilitating the bioavailability of soil nutrients and modulating the production of phytohormones (including auxins, cytokines, gibberellic acid, 1-aminocyclopropane-1-carboxylate deaminase-ACCD) and modulating plant hormone levels [22,23]. In addition, through microbial processes active in the rhizosphere, PGPR can also promote the mobility and bioavailability of metals in the soil, increasing their uptake by plants [23,24].…”

Section: Introductionmentioning

confidence: 99%

“…This strategy involves rhizobacteria that can stimulate plant growth by both facilitating the bioavailability of soil nutrients and modulating the production of phytohormones (including auxins, cytokines, gibberellic acid, 1-aminocyclopropane-1-carboxylate deaminase-ACCD) and modulating plant hormone levels [22,23]. In addition, through microbial processes active in the rhizosphere, PGPR can also promote the mobility and bioavailability of metals in the soil, increasing their uptake by plants [23,24]. This work aimed to investigate the single and synergistic effect of PGPR and EDTA on the growth and Pb uptake in two tolerant species, Brassica juncea L. (Indian mustard) and Helianthus annuus L. (sunflower), to evaluate the phytoremediation potential of a Pb-contaminated site.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Lead Phytoextraction by Endophytes from Indigenous Plants

et al. 2021

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Lead (Pb) is one of the most common metal pollutants in soil, and phytoextraction is a sustainable and cost-effective way to remove it. The purpose of this work was to develop a phytoextraction strategy able to efficiently remove Pb from the soil of a decommissioned fuel depot located in Italy by the combined use of EDTA and endophytic bacteria isolated from indigenous plants. A total of 12 endophytic strains from three native species (Lotus cornicolatus, Sonchus tenerrimus, Bromus sterilis) were isolated and selected to prepare a microbial consortium used to inoculate microcosms of Brassica juncea and Helianthus annuus. As for B. juncea, experimental data showed that treatment with microbial inoculum alone was the most effective in improving Pb phytoextraction in shoots (up to 25 times more than the control). In H. annuus, on the other hand, the most effective treatment was the combined treatment (EDTA and inoculum) with up to three times more Pb uptake values. These results, also validated by the metagenomic analysis, confirm that plant-microbe interaction is a crucial key point in phytoremediation.

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Improved arsenic phytoextraction by combined use of mobilizing chemicals and autochthonous soil bacteria

Cited by 58 publications

References 55 publications

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Nanoremediation of As and metals polluted soils by means of graphene oxide nanoparticles

Enhanced Lead Phytoextraction by Endophytes from Indigenous Plants

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