Iron-Oxidizing Bacteria Are Associated with Ferric Hydroxide Precipitates (Fe-Plaque) on the Roots of Wetland Plants

Emerson, David; Weiss, Johanna V.; Megonigal, J. Patrick

doi:10.1128/aem.65.6.2758-2761.1999

Cited by 238 publications

(108 citation statements)

References 23 publications

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“…[34] Dissolved oxygen in FTW also plays important role in the removal of metals by creating suitable conditions for the formation of particulate metal sulfides. [18,160] Depletion of oxygen by microbes on the rhizoplane also prompts the reduction of potentially toxic metals such as Cr, Mn, and Fe. [95] Moreover, the combined action of microorganisms and oxygen prompt the formation of iron and manganese plagues on the roots of the plants.…”

Section: Potentially Toxic Metalsmentioning

confidence: 99%

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Floating Wetlands: A Sustainable Tool for Wastewater Treatment

Shahid

Arslan

Ali

et al. 2018

CLEAN Soil Air Water

102

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Floating treatment wetland (FTW) is an effective and sustainable technology for wastewater treatment. It has been widely adopted for treating various kinds of polluted water including agricultural runoff, stormwater, industrial effluents, etc. In FTWs, plants are vegetated on a floating mat while their roots are extended down to the contaminated water hence acting as biological filters. Nutrients and potentially toxic metal(s)/element(s) are taken up from the wastewater by plants through their roots whereas organic matter is degraded by the microorganisms forming biofilms on the roots and mat surface. Additionally, organic contaminants which are already taken up by the plants are degraded by endophytic bacteria in planta. This article provides an overview of FTWs and their application for wastewater treatment. The key factors which have an impact on the performance of FTWs are also described. Lastly, the potential role of combined use of plants and bacteria in FTWs for the maximum remediation of polluted water is emphasized.

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Section: Potentially Toxic Metalsmentioning

confidence: 99%

“…www.advancedsciencenews.com www.clean-journal.com toxic metals, [18,160,177,178] urban/agricultural runoff containing a high concentration of oil and herbicides may harm the aquatic plants and microorganisms. [179] Any damage to macrophytes and biofilm will ultimately decrease the pollutant removal efficiency of the FTWs.…”

Section: Typha Latifoliamentioning

confidence: 99%

Floating Wetlands: A Sustainable Tool for Wastewater Treatment

Shahid

Arslan

Ali

et al. 2018

CLEAN Soil Air Water

102

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“…This occurs as a result of radial loss of oxygen from root aerenchyma into the surrounding anoxic soil or sediment where the gravitational deposition of particulate organic carbon exceeds the rate at which oxygen can diffuse in from the overlying water, and in which iron is present in the ferrous form. The oxidation of the ferrous iron is at least in part associated with the presence of iron-oxidizing bacteria (Emerson et al ., 1999). Once having formed the sheath (plaque) of precipitated ferric oxides, the radial leakage of oxygen from the roots is decreased and the oxygen supply to the growing apices is increased (Møller & Sand-Jensen, 2008) in Lobelia dortmanna , and the phosphate uptake by the roots of that plant is decreased (Christensen & Sand-Jensen, 1998).…”

Section: Ferric Oxides/hydroxidesmentioning

confidence: 99%

Biomineralization by photosynthetic organisms: Evidence of coevolution of the organisms and their environment?

Raven

Giordano

2009

Geobiology

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Biomineralization is widespread among photosynthetic organisms in the ocean, in inland waters and on land. The most quantitatively important biogeochemical role of land plants today in biomineralization is silica deposition in vascular plants, especially grasses. Terrestrial plants also increase the rate of weathering, providing the soluble substrates for biomineralization on land and in water bodies, a role that has had global biogeochemical impacts since the Devonian. The dominant photosynthetic biomineralizers in today's ocean are diatoms and radiolarians depositing silica and coccolithophores and foraminifera depositing calcium carbonate. Abiotic precipitation of silica from supersaturated seawater in the Precambrian preceded intracellular silicification dominated by sponges, then radiolarians and finally diatoms, with successive declines in the silicic acid concentration in the surface ocean, resulting in some decreases in the extent of silicification and, probably, increases in the silicic acid affinity of the active influx mechanisms. Calcium and bicarbonate concentrations in the surface ocean have generally been supersaturating with respect to the three common calcium carbonate biominerals through geological time, allowing external calcification as well as calcification in compartments within cells or organisms. The forms of calcium carbonate in biominerals, and presumably the evolution of the organisms that produce them, have been influenced by abiotic variations in calcium and magnesium concentrations in seawater, and calcium carbonate deposition has probably also been influenced by carbon dioxide concentration whose variations are in part biologically determined. Overall, there has been less biological feedback on the availability of substrates for calcification than is the case for silicification.

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“…Members of this microbial group are obligate microaerophiles, facultative or strict anaerobes. In natural environments, they occupy the narrow microaerobic zone forming below the redox zone in such ecosystems as sediments at the sites of pouring out of underground waters (Emerson & Moyer, 1997;Sobolev & Roden, 2004), deepwater marine hydrotherms (Gorshkov et al, 1992a, b;Emerson & Moyer, 2002;Edwards et al, 2003) and plant rhizosphere (Emerson et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Ferrovibrio denitrificans gen. nov., sp. nov., a novel neutrophilic facultative anaerobic Fe(II)-oxidizing bacterium

Sorokina

Chernousova

Дубинина

2012

FEMS Microbiol Lett

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A neutrophilic Fe(II)‐oxidizing bacterium was isolated from the redox zone of a low‐salinity spring in Krasnodar krai (Russia), at the FeS–Fe(OH)3 interface deposited at the sediment surface. The cells of strain Sp‐1 were short, thin motile vibrioids with one polar flagellum dividing by binary fission. The optimal values and ranges for pH and temperature were pH 6.2 (5.5–8) and 35 °C (5–45 °C), respectively. The organism was a facultative anaerobe. Strain Sp‐1 was capable of organotrophic, lithoheterotrophic and mixotrophic growth with Fe(II) as an electron donor. The denitrification chain was ‘disrupted’. Oxidation of Fe(II) was coupled to reduction of NO3 − to NO2 − or of N2O to N2, as well as under microaerobic conditions, with O2 as an electron acceptor. The DNA G+C content was 64.2 mol%. According to the results of phylogenetic analysis, the strain was 10.6–12% remote from the closest relatives, members of the genera Sneathiella, Inquilinus, Oceanibaculum and Phaeospirillum within the Alphaproteobacteria. Based on its morphological, physiological and taxonomic characteristics, together with the results of phylogenetic analysis, strain Sp‐1 is described as a member of a new genus Ferrovibrio gen. nov., with the type species Ferrovibrio denitrificans sp. nov. and the type strain Sp‐1T (= LMG 25817T = VKM B‐2673T).

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Iron-Oxidizing Bacteria Are Associated with Ferric Hydroxide Precipitates (Fe-Plaque) on the Roots of Wetland Plants

Cited by 238 publications

References 23 publications

Floating Wetlands: A Sustainable Tool for Wastewater Treatment

Floating Wetlands: A Sustainable Tool for Wastewater Treatment

Biomineralization by photosynthetic organisms: Evidence of coevolution of the organisms and their environment?

Ferrovibrio denitrificans gen. nov., sp. nov., a novel neutrophilic facultative anaerobic Fe(II)-oxidizing bacterium

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