Co-occurrence patterns of microbial communities affected by inoculants of plant growth-promoting bacteria during phytoremediation of heavy metal-contaminated soils

Kong, Zhaochen; Wu, Zijun; Glick, Bernard R.; He, Shiyao; Huang, Chien-Chang; Wu, Lang

doi:10.1016/j.ecoenv.2019.109504

Cited by 91 publications

(40 citation statements)

References 58 publications

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“…These bacteria might contribute to reducing metal-induced toxicity and increase the bioavailability and metals uptake of plants [27]. It is well reported that in FTWs the inoculated bacteria may boost the metals removal process by entrapment of metals in root biofilms, sorbing of metallic ions on the bacterial cell wall and oxidation of metal ions [52,53]. Further, the plaque formation by the combined action of plant and bacteria on plant roots may increase the Fe, Mn, Cu and Zn binding in roots biofilms [13,54].…”

Section: Discussionmentioning

confidence: 99%

Bacterial Augmented Floating Treatment Wetlands for Efficient Treatment of Synthetic Textile Dye Wastewater

et al. 2020

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Floating treatment wetland (FTW) is an innovative, cost effective and environmentally friendly option for wastewater treatment. The dyes in textile wastewater degrade water quality and pose harmful effects to living organisms. In this study, FTWs, vegetated with Phragmites australis and augmented with specific bacteria, were used to treat dye-enriched synthetic effluent. Three different types of textile wastewater were synthesized by adding three different dyes in tap water separately. The FTWs were augmented with three pollutants degrading and plant growth promoting bacterial strains (i.e., Acinetobacter junii strain NT-15, Rhodococcus sp. strain NT-39, and Pseudomonas indoloxydans strain NT-38). The water samples were analyzed for pH, electrical conductivity (EC), total dissolved solid (TDS), total suspended solids (TSS), chemical oxygen demand (COD), biological oxygen demand (BOD), color, bacterial survival and heavy metals (Cr, Ni, Mn, Zn, Pb and Fe). The results indicated that the FTWs removed pollutants and color from the treated water; however, the inoculated bacteria in combination with plants further enhanced the remediation potential of floating wetlands. In FTWs with P. australis and augmented with bacterial inoculum, pH, EC, TDS, TSS, COD, BOD and color of dyes were significantly reduced as compared to only vegetated and non-vegetated floating treatment wetlands without bacterial inoculation. Similarly, the FTWs application successfully removed the heavy metal from the treated dye-enriched wastewater, predominately by FTWs inoculated with bacterial strains. The bacterial augmented vegetated FTWs, in the case of dye 1, reduced the concentration of Cu, Ni, Zn, Fe, Mn and Pb by 75%, 73.3%, 86.9%, 75%, 70% and 76.7%, respectively. Similarly, the bacterial inoculation to plants in the case of dye 2 achieved 77.5% (Cu), 73.3% (Ni), 83.3% (Zn), 77.5% (Fe), 66.7% (Mn) and 73.3% (Pb) removal rates. Likewise in the case of dye 3, which was treated with plants and inoculated bacteria, the metals removal rates were 77.5%, 73.3%, 89.7%, 81.0%, 70% and 65.5% for Cu, Ni, Zn, Fe, Mn and Pb, respectively. The inoculated bacteria showed persistence in water, in roots and in shoots of the inoculated plants. The bacteria also reduced the dye-induced toxicity and promoted plant growth for all three dyes. The overall results suggested that FTW could be a promising technology for the treatment of dye-enriched textile effluent. Further research is needed in this regard before making it commercially applicable.

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Section: Discussionmentioning

confidence: 99%

Bacterial Augmented Floating Treatment Wetlands for Efficient Treatment of Synthetic Textile Dye Wastewater

et al. 2020

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“…The technology under consideration is the natural process of biological circulation, which is part of the cultivation of accumulators, improvement of soil properties and their protection against erosion (Han et al, 2019, Kiran et al, 2019. Phytoremediation has several advantages over physical remediation methods: it can be used in large areas, is much cheaper, does not require special equipment, contributes to the conservation and improvement of the environment, because it is associated withgrowing plants and improving soil condition (Kong et al, 2019). Thus, the main tasks of phytoremediation at the present stage of science development are the selection of plantshyperaccumulators of heavy metals in order to remove them from polluted areas, to study the mechanism of action of phytoextractors (Zhou et al, 2019, Massadeh et al, 2019.…”

Section: Introductionmentioning

confidence: 99%

Reducing danger of heavy metals accumulation in winter wheat grain which is grown after leguminous perennial precursor

Razanov¹,

Tkachuk²,

Бахмат³

et al. 2020

Ukr J Ecol

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Goal. Assessment of the influence of growing leguminous perennial herbs on the intensity of heavy metals accumulation in winter wheat as in a subsequent crop rotation. Methods. Field, laboratory atomic absorption method, mathematical and statistical processing. Results. cultivation of winter wheat after precursors of Medicago sativa I., Trifolium pratense L., Onobrychis arenaria Kit., Melilotus albus L., Lotus corniculatus L. or Galéga orientalis Lam. leads to a decrease in the content of lead by 1.8-2.5 times, cadmium – by 1.7–2.6 times, copper - 2.2–4.6 times and zinc - 1.6–1.9 times compared to winter wheat after corn precursor on silage. To obtain winter wheat with a minimum lead and copper content, the optimal precursor is Onobrychis arenaria Kit., with a minimum cadmium content - Galéga orientalis Lam. precursor, with a minimum copper and zinc content - the Trifolium precursorpratense L. The lowest influence on the reduction of heavy metals accumulation in winter wheat grain is caused by the precursor Lotus corniculatus L. Thanks to the use of leguminous perennial herbs as a precursor to winter wheat, it is possible to reduce the accumulation coefficient of heavy metals by 1.1-2.9 times compared with the corn precursor on silage. The lowest accumulation coefficient of the studied heavy metals was observed after the precursor of Medicago sativa I. Conclusion. Leguminous perennial herbs - Medicago sativa I., Trifolium pratense L., Onobrychis arenaria Kit., Melilotus albus L., Lotus corniculatus L. and Galega orientalis Lam. promote optimization of soil condition by increasing the content of humus, minerals nutrients, optimization of soil acidity. As a result, they reduce the accumulation of heavy metals (lead, cadmium, copper, and zinc) in winter wheat as the next crop in crop rotation and contribute to the reduction of accumulation coefficient of heavy metals in winter wheat.

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“…The plant-microbe interaction in the rhizospheric has been investigated due to the microorganisms' ability to accumulate metals from polluted environments. Besides, the so-called plant growth-promoting bacteria (PGPB) can increase metal uptake and hence improve phytoextraction (Chen et al, 2019;Kong et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Bioaugmentation-assisted phytoremediation relies on the use of plants (e.g., rhizosphere associated process), efficient microorganisms, and plant-growth-promoting bacteria (PGPB) to optimize the synergistic effect of both and enhance metal bioavailability in soil and plant metal uptake and biomass (Muratova et al, 2015;Phieler et al, 2015;Agnello et al, 2016;Ma et al, 2016a;Irshad et al, 2019;Kong et al, 2019;). Some bacteria are known as plant growth-promoting because they promote a wide range of benefits to the plant, including nitrogen fixation, phosphate solubilization, and exudation of siderophores; also, they act as biocontrol agents and produce indole-3-acetic acid that increases plant biomass, nutrition, and health (Ahemad and Kibret, 2014;Irshad et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Bioaugmentation-assisted phytoremediation of As, Cd, and Pb using Sorghum bicolor in a contaminated soil of an abandoned gold ore processing plant

Boechat¹,

Carlos²,

Nascimento³

et al. 2020

Revista Brasileira De Ciência Do Solo

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Co-occurrence patterns of microbial communities affected by inoculants of plant growth-promoting bacteria during phytoremediation of heavy metal-contaminated soils

Cited by 91 publications

References 58 publications

Bacterial Augmented Floating Treatment Wetlands for Efficient Treatment of Synthetic Textile Dye Wastewater

Bacterial Augmented Floating Treatment Wetlands for Efficient Treatment of Synthetic Textile Dye Wastewater

Reducing danger of heavy metals accumulation in winter wheat grain which is grown after leguminous perennial precursor

Bioaugmentation-assisted phytoremediation of As, Cd, and Pb using Sorghum bicolor in a contaminated soil of an abandoned gold ore processing plant

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