Root Exudates, Rhizosphere Zn Fractions, and Zn Accumulation of Ryegrass at Different Soil Zn Levels

Xu, Weihong; Liu, Huai; Ma, Qifu; Zhou, Xiong

doi:10.1016/s1002-0160(07)60047-2

Cited by 56 publications

(11 citation statements)

References 13 publications

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“…Meanwhile, 0 to 5 mL of solution were mixed with 2.5 mL of 10 mmol L^^ Mn(Na2HP2Oy)3 in 10-mL test tubes, mixed with 2.5 mL of H2SO^, and incubated for 1 h. Colorimetric determination was used to determine the total dissolved organic matter (DOM) in solution (Zhan and Zhou, 2002). Simultaneously, specific volumes of solution were collected to determine the aqueous concentrations of organic and amino acids according to Dong et al (2005) and Xu et al (2007). Methods to determine the fructose concentrations in solution were described previously .…”

Section: Sorption Testsmentioning

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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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: Sorption Testsmentioning

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 in the rhizosphere soil were collected according to the methods of Szmigielska et al (1996) and Xu et al (2007). A ftesh soil sample ( 5 g on a dty-weight basis) was packed in a 100-mL glass tube with a screw cap and extracted with distilled water containing bactéri-cide (1:10 soil/watet ratio), then shaken for 2 h at 20°C and centrifuged.…”

Section: Root Exúdate Collection and Analysismentioning

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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“…When a plant is intimidated by heavy metal, the root will release some lowmolecular-weight organic acids to complex with the heavy metal. Xu et al [19] found that low-molecular-weight organic acids (oxalic, tartaric, malic, and succinic acids) were detected in root exudates when the soil was spiked by 4 mmol kg −1 of Zn. Lu et al [20] indicated that when a soil was spiked by Cd, monocarboxylic acids (formic, acetic, lactic, butyric and propionic acids), and di-and tricarbonxylic acids (maleic, fumaric, citric and tartaric acids) were found in root exudates.…”

Section: Introductionmentioning

confidence: 99%

Effects of low-molecular-weight organic acids on Cu(II) adsorption onto hydroxyapatite nanoparticles

Wang

Chen

Yuxia

et al. 2009

Journal of Hazardous Materials

116

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Root Exudates, Rhizosphere Zn Fractions, and Zn Accumulation of Ryegrass at Different Soil Zn Levels

Cited by 56 publications

References 13 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

Effects of low-molecular-weight organic acids on Cu(II) adsorption onto hydroxyapatite nanoparticles

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