Microbially catalyzed dissolution of iron and aluminum oxyhydroxide mineral surface coatings

Grantham, Meg C.; Dove, Patricia M.; DiChristina, Thomas J.

doi:10.1016/s0016-7037(97)00265-2

Cited by 96 publications

(51 citation statements)

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“…A big unknown in regard to the chemical effects of biota is the mycorrhizal fungal community (Grantham et al, 1997;Balogh-Brunstad et al, 2008b;Graham et al, 2010). Numerous experimental studies have shown that roots and their symbiotic fungi constantly forage and biosense nutrient sources (Leake et al, 2008;McNear, 2013), and thus roots and fungi perhaps access nutrients down to several meters in depth Hasenmueller et al, 2017).…”

Section: Hypothesismentioning

confidence: 99%

Reviews and syntheses: on the roles trees play in building and plumbing the critical zone

et al. 2017

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Abstract. Trees, the most successful biological power plants on earth, build and plumb the critical zone (CZ) in ways that we do not yet understand. To encourage exploration of the character and implications of interactions between trees and soil in the CZ, we propose nine hypotheses that can be tested at diverse settings. The hypotheses are roughly divided into those about the architecture (building) and those about the water (plumbing) in the CZ, but the two functions are intertwined. Depending upon one's disciplinary background, many of the nine hypotheses listed below may appear obviously true or obviously false. (1) Tree roots can only physically penetrate and biogeochemically comminute the immobile substrate underlying mobile soil where that underlying substrate is fractured or pre-weathered. (2) In settings where the thickness of weathered material, H , is large, trees primarily shape the CZ through biogeochemical reactions within the rooting zone. (3) In forested uplands, the thickness of mobile soil, h, can evolve toward a steady state because of feedbacks related to root disruption and tree throw. (4) In settings where h H and the rates of uplift and erosion are low, the uptake of phosphorus into trees is buffered by the fine-grained fraction of the soil, and the ultimate source of this phosphorus is dust. (5) In settings of limited water availability, trees maintain the highest length density of functional roots at depths where water can be extracted over most of the growing season with the least amount of energy expenditure. (6) Trees grow the majority of their roots in the zone where the most growth-limiting resource is abundant, but they also grow roots at other depths to forage for other resources and to hydraulically redistribute those resources to depths where they can be taken up more efficiently. (7) Trees rely on matrix water in the unsaturated zone that at times may have anPublished by Copernicus Publications on behalf of the European Geosciences Union. 5116 S. L. Brantley et al.: Reviews and syntheses: on the roles trees play in building and plumbing the critical zone isotopic composition distinct from the gravity-drained water that transits from the hillslope to groundwater and streamflow. (8) Mycorrhizal fungi can use matrix water directly, but trees can only use this water by accessing it indirectly through the fungi. (9) Even trees growing well above the valley floor of a catchment can directly affect stream chemistry where changes in permeability near the rooting zone promote intermittent zones of water saturation and downslope flow of water to the stream. By testing these nine hypotheses, we will generate important new cross-disciplinary insights that advance CZ science.

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Section: Hypothesismentioning

confidence: 99%

Reviews and syntheses: on the roles trees play in building and plumbing the critical zone

et al. 2017

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“…The OM cytochromes are iron reductases capable of transferring electrons directly to Fe(III) in the mineral crystal lattice (Gaspard et al, 1998;Myers & Myers, 2004;Mehta et al, 2005;Ruebush et al, 2006), although other proteins may also play important roles in electron transport (Reguera et al, 2005). Direct contact is required between Shewanella and the metal-oxide surface to ensure effective electron transfer (Arnold et al, 1988;Myers & Nealson, 1988;Caccavo et al, 1996;Grantham et al, 1997;Das & Caccavo, 2000); however, cell adhesion to minerals is not necessary when soluble electron shuttles or iron-complexing agents are produced (Arnold et al, 1988;Lovley & Woodward, 1996;Lovley et al, 1998;Newman & Kolter, 2000;Turick et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Shewanella readily adhere to iron oxides, preferring these to other minerals (Caccavo et al, 1997;Grantham et al, 1997;Glasauer et al, 2001;Lower et al, 2001). The exact mechanism of adhesion is not completely understood.…”

Section: Introductionmentioning

confidence: 99%

“…Transmission electron microscopy (TEM), atomic force microscopy (AFM) and differential centrifugation have revealed strong associations between the bacteria and iron oxides, implying that the adhesion may be irreversible (Glasauer et al, 2001;Lower et al, 2001). Yet, during anaerobic pitting of iron oxide-coated quartz, cells remain passively mobile on the mineral surfaces, moving from one region to another (Grantham et al, 1997). Shewanella therefore appear to be able to formulate adhesive forces for strong contact, and yet, break these forces so as to systematically migrate across mineral surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…Shewanella therefore appear to be able to formulate adhesive forces for strong contact, and yet, break these forces so as to systematically migrate across mineral surfaces. To complicate matters further, it has been suggested that electrostatic interactions govern this adhesion (Grantham et al, 1997), but other studies suggest that the initial attachment of Shewanella algae is dominated by hydrophobic interactions mediated by surface proteins (Caccavo et al, 1997;Caccavo, 1999).…”

Section: Introductionmentioning

confidence: 99%

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The surface physicochemistry and adhesiveness of Shewanella are affected by their surface polysaccharides

Korenevsky

Beveridge

2007

Microbiology

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Shewanella strains have previously been studied with regard to their cell surface ultrastructure and LPS composition. They have now been further characterized with respect to their surface physicochemistry and ability to adhere to haematite. The surfaces of the Shewanella strains were found to be electronegative and hydrophilic, and these properties could be correlated with LPS composition or the presence of capsular polysaccharides. Strains expressing rough LPS with no capsule were more hydrophobic and electronegative than those possessing smooth LPS or capsules. By combining different approaches, such as contact-angle measurement, hydrophilic/ hydrophobic chromatography, microelectrophoresis, adhesion assays and calculation of interaction energies, it was shown that electrostatic interactions predominate over hydrophobic interactions at the cell-iron oxide interface. Bacterial adhesion to haematite was significantly reduced in strains expressing smooth LPS or a capsule. These findings remained true for Shewanella strains grown under either aerobic or anaerobic conditions, although the surfaces of anaerobic cells appeared to be less electronegative and more hydrophilic than those of aerobic cells.

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Weathering: Mineral Weathering and Microbial Metabolism

Ullman

Welch

2003

Encyclopedia of Environmental Microbiology

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Microbially catalyzed dissolution of iron and aluminum oxyhydroxide mineral surface coatings

Cited by 96 publications

References 50 publications

Reviews and syntheses: on the roles trees play in building and plumbing the critical zone

Reviews and syntheses: on the roles trees play in building and plumbing the critical zone

The surface physicochemistry and adhesiveness of Shewanella are affected by their surface polysaccharides

Weathering: Mineral Weathering and Microbial Metabolism

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