Root Exudates Impact on Phenanthrene Availability

Ouvrard, Stéphanie; Lapole, D.; Morel, Jean-Louis

doi:10.1007/s11267-005-9027-9

Cited by 27 publications

(22 citation statements)

References 17 publications

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“…Assessment of the availability of NOCs in rhizosphere soil is important for understanding the risk posed by contaminants and the techniques required for successful rhizoremediation (Alexander, 2000;Ouvrard et al, 2006;Ling et al, 2009). To our knowledge, this is the first primary investigation comparably exploring the impacts of different RECs on PAH availability in soil.…”

Section: Discussion the Impact Of Root Exudates On Polycyclic Aromatimentioning

confidence: 99%

“…Recent studies have shown that root exudates may alter the availability of POPs in the soil environment (Ouvrard et al, 2006;Ling et al, 2009;Zhu et al, 2009). Joner et al (2002 found that the concentrations of five-ring and six-ring PAHs in soil are enhanced in the presence of root exudates and attributed this to the desorption of initially unextractable molecules.…”

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confidence: 99%

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The Impact of Different Root Exudate Components on Phenanthrene Availability in Soil

Sun

Gao

Liu

et al. 2012

Soil Science Soc of Amer J

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This study investigated the impact of different root exúdate components (RECs) on the availability of phenanthrene as a representative of polycyclic aromatic hydrocarbons (PAHs) in soil (TypicPaleudalfs) using laboratory batch assays. Four typical RECs were compared including malic acid, alanine, serine, and fructose. An n-butanol extraction procedure and a sorption-desorption experiment were used to predict the availability of phenanthrene in soil. We found that the n-butanol extractable amounts of phenanthrene in soil increased with increasing REC concentrations. The extractability of phenanthrene in soil with various treatments decreased in the following order: malic acid > alanine > serine > fructose treatments. Organic acid (malic acid) resulted in the most significant increase in PAH extractability by soil. Phenanthrene sorption by soil could be described using a linear model regardless of the presence of RECs. The simulated distribution constants (K¿) and carbon-normalized distribution constants (Kg^) for phenanthrene sorption decreased significantly with the addition of all test RECs. Malic acid enhanced desorption of phenanthrene from soils. In contrast, lower concentrations of test amino acids promoted phenanthrene desorption, while higher concentrations inhibited desorption. Fructose had a minimal effect on PAH desorption. The mechanism of REC-influenced availability of PAH in soil is discussed based on the observed metal dissolution, soil organic matter reduction, and dissolved organic matter release from soil solids.

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Section: Discussion the Impact Of Root Exudates On Polycyclic Aromatimentioning

confidence: 99%

mentioning

confidence: 99%

The Impact of Different Root Exudate Components on Phenanthrene Availability in Soil

Sun

Gao

Liu

et al. 2012

Soil Science Soc of Amer J

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“…Root exudates not only serve as convenient sources of C and energy for microorganisms but also affect the availability of recalcitrant organic pollutants, including PAHs, in the rhizosphere (Ouvrard et al, 2006;Ling et al, 2009;Gao et al, 2010a,b). Polycyclic aromatic hydrocarbons, as well as other persistent organic contaminants, are readily adsorbed by soil solids, particularly soil organic matter, after entering the soil.…”

Section: Distribution Gradient Of Polycyclic Aromatic Hydrocarbons Inmentioning

confidence: 99%

Gradient Distribution of Root Exudates and Polycyclic Aromatic Hydrocarbons in Rhizosphere Soil

Gao

Yang

Ling

et al. 2011

Soil Science Society of America Journal

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The gradients of root exudates and of persistent organic pollutants, including polycyclic aromatic hydrocarbons (PAHs), in rhizosphere soil in proximity to the root surface are still not well elucidated. In this work, a greenhouse experiment was conducted to investigate the distribution gradients of root exudates and phenanthrene and pyrene, as selected PAHs, in rhizosphere soil close to (0-8 mm) the root surface of ryegrass [Ldium multiflorum Lam.) as the host plant. Rhizosphere soil from the root surface (0-8 mm) was divided into three layers: the rhizoplane and strongly and loosely adhering soil. Root exudates were characterized as soluble organic C, organic acids, and total soluble sugars. In PAH-spiked rhizosphere soils, the concentration of root exudates decreased with distance from the roots. In a sterilized treatment, the amounts of root exudates in the three rhizosphere layers were higher than when the soil was not sterilized, indicating that microbial consumption contributed significantly to the loss of root exudates in the rhizosphere. Tlie residual concentrations of phenanthrene and pyrene clearly increased in die order of rhizoplane to loosely adhering soil after 40 to 50 d, which was significantly and negatively correlated with the amount of root exudates in the rhizosphere. In total, 87 to 97% of phenanthrene and 69 to 79% of pyrene dissipated in all three layers of rhizosphere soil after 40 d, and >99% of phenanthrene and 93% of pyrene dissipated after 50 d. The degradation ratio of PAHs decreased in rhizosphere soils with distance from the roots.Abbreviations: OA, organic acid; PAH, polycyclic aromatic hydrocarbon: SOC, soluble organic carbon: TSS,) total soluble sugar.

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“…Walton et al (1994) demonstrated that plants may respond to chemical stress by increasing or changing the exudation radical affecting the microfloral composition or activity of the rhizosphere, being capable of degrading toxicants. In the same way, Amellal et al (2002) and Ouvrard et al (2006) demonstrated that plants subjected to chemical stress can change soil properties, varying the bioavailability of contaminants in the soil. However, we must consider that there might be other factors that affect the exudation of organic acids.…”

Section: Production Of Organic Acids Exuded By Roots Of Lolium Multifmentioning

confidence: 91%

Removal of pentachlorophenol in a rhizotron system with ryegrass (Lolium multiflorum)

Urrutia

Rubilar

Parede

et al. 2013

J. Soil Sci. Plant Nutr.

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Degradation of pentachlorophenol (PCP) in the rhizosphere of Lolium multiflorum (ryegrass) was studied in an Andisol of southern Chile. A rhizotron system was designed to evaluate the effect of different PCP concentrations (50, 100 and 250 mg kg -1 ) on plant biomass, organic acid exudation, dehydrogenase and the β-glucosidase activity of L. multiflorum. Moreover, the microbial biomass was estimated using a molecular technique in different sections of rhizotrons. More than 96% of PCP was removed in the rhizotron system by adsorption in the soil and degradation by the rhizosphere of L. multiflorum. The plant biomass decreased when the PCP concentration was increased in the soil, the biomass for the treatment with 250 mg kg -1 being significantly lower. The estimation of the microbial biomass and β-glucosidase activity in the soil was not affected when the PCP concentration was increased, indicating a low toxicity of the contaminant due to its lesser availability. However, the dehydrogenase activity decreased when increasing the PCP concentration, showing negative effects on microorganisms. The organic acid exudates varied during the incubation time, influenced by the stress of the different treatments and the distribution of roots. Therefore, Lolium multiflorum is a promising candidate for designing field scale phytoremediation processes.

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Root Exudates Impact on Phenanthrene Availability

Cited by 27 publications

References 17 publications

The Impact of Different Root Exudate Components on Phenanthrene Availability in Soil

The Impact of Different Root Exudate Components on Phenanthrene Availability in Soil

Gradient Distribution of Root Exudates and Polycyclic Aromatic Hydrocarbons in Rhizosphere Soil

Removal of pentachlorophenol in a rhizotron system with ryegrass (Lolium multiflorum)

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