Origins of root-mediated pH changes in the rhizosphere and their responses to environmental constraints: A review

Hinsinger, Philippe; Plassard, Claude; Tang, Caixian; Jaillard, Benoît

doi:10.1023/a:1022371130939

Cited by 1,204 publications

(570 citation statements)

References 121 publications

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“…Organic acids in the soil, produced from root exudates, may compete for the same binding sites as P, depressing the P sorption strength of the soil (Ylivainio et al, 2008). The exudation of organic anions by the roots has been found to occur in the rhizosphere, associated with NO3 − -N nutrition in preference to NH 4 + -N (Marschner, 1995;Hinsinger et al, 2003); also, localized release of H + by some portions of the roots has been reported to occur as a response to P deficiency, favoring P solubility in the soil (Hinsinger et al, 2003). Jones (1998) reported two mechanisms of P release in the soil rhizosphere: direct ligand exchange, whereby citrate directly replaces P on ligand exchange surfaces, and complexation with metal ions in the solid phase, which constitutes the exchange matrix holding P (such as Ca 2+ in rock phosphate).…”

Section: Nutrient Uptake and Accumulation By L Multiflorummentioning

confidence: 99%

Composts Produced From Pig Slurry Solids: Nutrient Efficiency and N-Leaching Risks in Amended Soils

Santos

Fangueiro

Moral

et al. 2018

Front. Sustain. Food Syst.

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Section: Nutrient Uptake and Accumulation By L Multiflorummentioning

confidence: 99%

Composts Produced From Pig Slurry Solids: Nutrient Efficiency and N-Leaching Risks in Amended Soils

Santos

Fangueiro

Moral

et al. 2018

Front. Sustain. Food Syst.

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“…Interestingly, malonate has been labeled a potential inhibitor of microbial respiration due to its inhibition of succinate dehydrogenase, a key enzyme of the citric acid cycle (Ikuma and Bonner, 1967;Li and Copeland, 2000;Phillips et al, 2012). However, our results show that malonate greatly increases soil respiration.…”

Section: Citrate and Malonate Enhanced Microbial Activity In Uncontammentioning

confidence: 55%

“…The fact that soil pH was highest in the treatment with the greatest cumulative CO 2 evolution (citrate) is consistent with this scenario. However, the increase in soil pH may also be due to the reaction of carboxylate ions with free H + in the soil solution, ammonification of organic nitrogen or NO − 3 uptake by microorganisms (Hinsinger et al, 2003). Soil acidification poses a potential impediment to biodegradation as PHCs are optimally degraded within a near-neutral pH (Dibble and Bartha, 1979).…”

Section: Citrate and Malonate Enhanced Microbial Activity In Uncontammentioning

confidence: 99%

Citrate and malonate increase microbial activity and alter microbial community composition in uncontaminated and diesel-contaminated soil microcosms

Martin

George

Price

et al. 2016

SOIL

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Abstract. Petroleum hydrocarbons (PHCs) are among the most prevalent sources of environmental contamination. It has been hypothesized that plant root exudation of low molecular weight organic acid anions (carboxylates) may aid degradation of PHCs by stimulating heterotrophic microbial activity. To test their potential implication for bioremediation, we applied two commonly exuded carboxylates (citrate and malonate) to uncontaminated and diesel-contaminated microcosms (10 000 mg kg −1 ; aged 40 days) and determined their impact on the microbial community and PHC degradation. Every 48 h for 18 days, soil received 5 µmol g −1 of (i) citrate, (ii) malonate, (iii) citrate + malonate or (iv) water. Microbial activity was measured daily as the flux of CO 2 . After 18 days, changes in the microbial community were assessed by a community-level physiological profile (CLPP) and 16S rRNA bacterial community profiles determined by denaturing gradient gel electrophoresis (DGGE). Saturated PHCs remaining in the soil were assessed by gas chromatography-mass spectrometry (GC-MS). Cumulative soil respiration increased 4-to 6-fold with the addition of carboxylates, while diesel contamination resulted in a small, but similar, increase across all carboxylate treatments. The addition of carboxylates resulted in distinct changes to the microbial community in both contaminated and uncontaminated soils but only a small increase in the biodegradation of saturated PHCs as measured by the n-C17 : pristane biomarker. We conclude that while the addition of citrate and malonate had little direct effect on the biodegradation of saturated hydrocarbons present in diesel, their effect on the microbial community leads us to suggest further studies using a variety of soils and organic acids, and linked to in situ studies of plants, to investigate the role of carboxylates in microbial community dynamics.

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“…This seems to be the principal explanation for the lower As levels on plants cultivated in control soil (pH: mean 7.3; organic matter: 6.8%) than in experimental soil (pH: mean 7.8; organic matter 2.7%) values presented in Table 2. The main mechanisms responsible for the pH in the rhizosphere have been classified by Hinsinger et al [31]. Among these one of the most important is the release of large amounts of citrate by lupine roots [22] [32].…”

Section: Total As Concentration In Soil Seeds Leaves and Roots Of Lmentioning

confidence: 99%

“…The pK for citrate 2− /citrate 3− is 6.40 which is feasible for reacting with free H + in the soil solution at relative low pH. Hence in acidified soils (pH ≤ 5.5) the presence of citrate could contribute to an increase in the rhizosphere pH [31]. The decrease in the concentrations of soluble elements in the presence of plants could be due to either plant uptake or plant interaction with the soil components or both, being the pH the most important factor [19] [21].…”

Section: Total As Concentration In Soil Seeds Leaves and Roots Of Lmentioning

confidence: 99%

<i>Lupinus microcarpus</i> Growing in Arsenic—Agricultural Soils from Chile: Toxic Effects and It Potential Use as Phytoremediator Plant

Espinoza¹,

Tapia²,

Pastene³

et al. 2016

JEP

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Arsenic (As) is the most important contaminant of the environment in northern Chile. The purpose of the present work is to study As-toxicity symptoms on Lupino microcarpus (lupine), an annual legume plant that constitutes part of the desert community of the pre-Andean area of the Antofagasta Region, Chile. This plant species is cultivated in As-agricultural soil collected from Chiu Chiu (northern Chile) which is classified as arid soils. Control soil (0 -20 cm depth) is collected from an area located in the central zone of Chile, which is classified as molli soil. The main physic-chemical characteristics of As-soil and the control soil are determined. Eighteen plastic pots of 1.6 L (fifteen for experimental and three for control) are filled with As-soil and control soil treatments. Two plants are cultivated in each pot and then separated leaves and roots for As-analysis. Visual As-toxicity symptoms such as foliar chlorosis, necrosis of the leaf tips and margins, leaf wilting and stunted are determined. Total As concentrations in soils where lupine is cultivated, reach levels between 5.3 -14. O. P. Díaz et al. 117As-agricultural soils. Neither control lupin plant suffers any toxicity symptoms. The results indicate that lupine plants do not resist contamination and accumulated higher levels of As in roots. Lupine can be used in the phytostabilisation of As immobilizing it by microbial activity in agricultural soil.

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Origins of root-mediated pH changes in the rhizosphere and their responses to environmental constraints: A review

Cited by 1,204 publications

References 121 publications

Composts Produced From Pig Slurry Solids: Nutrient Efficiency and N-Leaching Risks in Amended Soils

Composts Produced From Pig Slurry Solids: Nutrient Efficiency and N-Leaching Risks in Amended Soils

Citrate and malonate increase microbial activity and alter microbial community composition in uncontaminated and diesel-contaminated soil microcosms

<i>Lupinus microcarpus</i> Growing in Arsenic—Agricultural Soils from Chile: Toxic Effects and It Potential Use as Phytoremediator Plant

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Origins of root-mediated pH changes in the rhizosphere and their responses to environmental constraints: A review

Cited by 1,204 publications

References 121 publications

Composts Produced From Pig Slurry Solids: Nutrient Efficiency and N-Leaching Risks in Amended Soils

Composts Produced From Pig Slurry Solids: Nutrient Efficiency and N-Leaching Risks in Amended Soils

Citrate and malonate increase microbial activity and alter microbial community composition in uncontaminated and diesel-contaminated soil microcosms

&lt;i&gt;Lupinus microcarpus&lt;/i&gt; Growing in Arsenic—Agricultural Soils from Chile: Toxic Effects and It Potential Use as Phytoremediator Plant

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<i>Lupinus microcarpus</i> Growing in Arsenic—Agricultural Soils from Chile: Toxic Effects and It Potential Use as Phytoremediator Plant