Rhizosphere alkalisation — a major driver of copper bioavailability over a broad pH range in an acidic, copper-contaminated soil

Bravin, Matthieu; Martí, Amparo Pons; Clairotte, Michaël; Hinsinger, Philippe

doi:10.1007/s11104-008-9835-6

Cited by 64 publications

(66 citation statements)

References 43 publications

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“…This acidification might be caused by a locally restricted uptake of positively charged ions, such as potassium or ammonium, that are necessary for plant nutrition. This effect is well-known to cause an acidification along the roots (Bravin et al 2009a;Marschner 1995;Miller and Cramer 2004). However, as reported earlier (Colmer and Bloom 1998;Taylor and Bloom 1998), the uptake of ammonium does not seem to be limited to a specific zone along the root surface of maize.…”

Section: Discussionmentioning

confidence: 72%

“…One possible explanation might be the uptake of negatively charged ions necessary for plant nutrition like nitrate (NO 3 − ) (Bravin et al 2009a;Marschner 1995;McClure et al 1990;Miller and Cramer 2004;Rausch and Bucher 2002;Taylor and Bloom 1998), i.e. the reversed process as discussed above concerning the acidification of maize rhizosphere.…”

Section: Discussionmentioning

confidence: 99%

“…Data are based on the pH data from Table 2, previously described cadmium concentrations in the bulk soil (Gérard 2000;Perriguey 2006) and the Eqs. (1) and (2) Plant Soil (2010) 330:173-184(up to pH 8.6) should strongly decrease the availability of trace-metals in the soil solution due to an increase of the sorption capacity of the soil (Bravin et al 2009a;Christensen 1984;Loosemore et al 2004;Ma and Lindsay 1995;Sauvé et al 2000;Scheffer and Schachtschabel 2002). It is well-known that the logarithm of the amount of soluble metals like Cd 2+ linearly decreases as pH increases.…”

Section: Discussionmentioning

confidence: 99%

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Rhizosphere pH dynamics in trace-metal-contaminated soils, monitored with planar pH optodes

Bloßfeld

Perriguey²,

Sterckeman³

et al. 2009

Plant Soil

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The present study presents new insights into pH dynamics in the rhizosphere of alpine pennycress (Noccaea caerulescens (J. Presl & C. Presl) F.K. Mey), maize (Zea mays L.) and ryegrass (Lolium perenne L.), when growing on three soils contaminated by trace metals with initial pH values varying from 5.6 to 7.4. The pH dynamics were recorded, using a recently developed 2D imaging technique based on planar pH optodes. This showed that alpine pennycress and ryegrass alkalinized their rhizosphere by up to 1.7 and 1.5 pH units, respectively, whereas maize acidified its rhizosphere by up to −0.7 pH units. The alkalinization by the roots of alpine pennycress and ryegrass was permanent and not restricted to specific root zones, whereas the acidification along the maize roots was restricted to the elongation zone and thus only temporary. Calculations showed that such pH changes should have noticeable effects on the solubility of the trace metal in the rhizosphere, and therefore on their uptake by the plants. As a result, it is suggested that models for trace metal uptake should include precise knowledge of rhizospheric pH conditions.

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Section: Discussionmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Rhizosphere pH dynamics in trace-metal-contaminated soils, monitored with planar pH optodes

Bloßfeld

Perriguey²,

Sterckeman³

et al. 2009

Plant Soil

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show abstract

“…After thawing, root length was measured on stained roots using a scanner (Epson expression 10000 XL) with a two light sources procedure and the WinRHIZO software (version 2005 b, Regent Instruments, Canada), as previously detailed by Bravin et al (2009). After root length measurements, root samples were oven-dried at 105°C for dry biomass determination.…”

Section: Plant Measurementsmentioning

confidence: 99%

Copper uptake kinetics in hydroponically-grown durum wheat (Triticum turgidum durum L.) as compared with soil’s ability to supply copper

et al. 2009

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This study investigated (a) net Cu uptake kinetics in durum wheat (Triticum turgidum durum L.) exposed to free Cu 2+ activities in solution ranging from 0.4 to 2,420 nM and (b) the relative importance of plant uptake and soil's ability to supply Cu 2+ to the roots. Plant Cu flux showed a hyperbolic shape, enabling to estimate the Michaelis-Menten kinetic parameters (F max and K M ) for durum wheat. Plant Cu flux was then compared with soil Cu flux as assessed by the Diffusive Gradient in Thin film technique on seven soil samples. This comparison suggested that the rate-limiting process of Cu bioavailability to durum wheat would be plant uptake kinetics in most contaminated soils with the exception of moderately contaminated, calcareous soils. However, theoretical considerations targeted soil's ability to supply Cu as the rate-limiting process in most soils for Cu (hyper-) accumulator plants with requirement larger than that of common crop species.

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“…Since nitrogen is the main taken-up mineral, nitrogen cycling may cause soil changes. For instance, NH 4+ preference may induce soil acidification whereas NO 3-preference may induce soil alkalization (Haynes 1990;Bravin et al 2008). Thus, LEG and DRY preferences on the Al-Ca gradient might reflect uptake preferences for different forms of nitrogen.…”

Section: Introductionmentioning

confidence: 99%

Functional antagonism between nitrogen-fixing leguminous trees and calcicole-drought-tolerant trees in the Cerrado

et al. 2017

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Th e Cerrado is the largest savanna of South America and its physiognomy varies from savanna to woodlands. Th ere are two main types of woodlands in the Cerrado: dystrophic woodlands, dominated by N-fi xing leguminous trees (LEG), and mesotrophic woodlands dominated by non-leguminous drought-tolerant trees (DRY), which are calcicoles and sensitive to Al . Th e working hypothesis is that LEG and DRY are functional antagonists in terms of the acidifi cation/alkalization processes involving diff erent forms of inorganic nitrogen and pH, Ca 2+ and Al 3+ in soil. Tree species basal area and soil properties were used to investigate the antagonism between LEG and DRY using generalized linear models. Th e results suggest that LEG and DRY are antagonists. Th e LEG were positively associated with Al 3+ , NO 3-and NH 4+ content and negatively related to increasing Ca 2+ content, whereas the DRY were negatively associated with Al 3+ , NO 3-and NH 4+ and positively associated with increasing Ca 2+ content. Th e upper soil layer in plots dominated by LEG species became more acidic and the upper soil layer in plots dominated by DRY species became more alkaline. Th e results suggest that LEG and DRY are functional antagonists and their preferences for NH 4+ or NO 3-might infl uence the way the Cerrado woodland changes.

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Rhizosphere alkalisation — a major driver of copper bioavailability over a broad pH range in an acidic, copper-contaminated soil

Cited by 64 publications

References 43 publications

Rhizosphere pH dynamics in trace-metal-contaminated soils, monitored with planar pH optodes

Rhizosphere pH dynamics in trace-metal-contaminated soils, monitored with planar pH optodes

Copper uptake kinetics in hydroponically-grown durum wheat (Triticum turgidum durum L.) as compared with soil’s ability to supply copper

Functional antagonism between nitrogen-fixing leguminous trees and calcicole-drought-tolerant trees in the Cerrado

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