Nutritional constraints to degradation of polycyclic aromatic hydrocarbons in a simulated rhizosphere

Joner, Erik J.; Corgié, Stéphane C.; Amellal, Najat; Leyval, Corinne

doi:10.1016/s0038-0717(02)00018-4

Cited by 194 publications

(99 citation statements)

References 32 publications

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“…Twenty grams of the spiked soils was then packed into a custom brown glass vial (50 mL). The oxalic acid, glycine, and fructose as root exudate components were added separately into the soils at a concentration of 20 g/kg, similar to those used by Joner et al (2002) and Gao et al (2010a), and then mixed. Soils were rinsed with deionized water every day to maintain 50 % of field capacity by weighing and incubated at 25°C in the dark for 60 days.…”

Section: Soils and Closed-bottle Moist Microcosmmentioning

confidence: 99%

“…Root exudates are likely to stimulate soil microbial diversity and activity and thereby facilitate microbial biodegradation of organic contaminants. Both in vivo and in vitro experiments have demonstrated that root exudates can enhance microbial biodegradation of petroleum hydrocarbons in soils (Miya and Firestone 2001;Joner et al 2002;Corgié et al 2004Corgié et al , 2006. Research by Yoshitomi and Shann (2001) has shown that root exudates stimulate microbial mineralization of polycyclic aromatic hydrocarbons (PAHs) by the growth of soil microorganisms and the changes in structure and function of microbial community.…”

Section: Introductionmentioning

confidence: 99%

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Influences of artificial root exudate components on the behaviors of BDE-28 and BDE-47 in soils: desorption, availability, and biodegradation

Huang

Wang

et al. 2016

Environ Sci Pollut Res

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Behaviors of BDE-28 and BDE-47 in two distinct soils (Phaeozem and Acrisol) as affected by the separate addition of root exudate components (i.e., oxalic acid, glycine, and fructose) were investigated by a soil microcosm incubation experiment. The results showed that root exudate components promoted the desorption of BDE-28 (57.6-235.0 %) and BDE-47 (56.9-223.7 %) from the soils due to the enhancement of their water solubilities. The addition of root exudate components increased the n-butanol extractability of BDE-28 and BDE-47 by 20.3-72.5 and 48.6-169.2 %, respectively, which had a positive correlation with the concentrations of dissolved organic carbon (DOC) in the soils (p < 0.01), suggesting that the increase of DOC in the soils by root exudate components was the major factor to enhance the extractability. Fructose and oxalic acid promoted the desorption and increased the availability of BDE-28 and BDE-47 in the soils more efficiently than glycine. The addition of different root exudate components resulted in distinct shifts in soil microbial community structure (p < 0.05). Oxalic acid caused the greatest impacts on the soil bacterial communities and increased the degradation rates of BDE-28 and BDE-47 most obviously. The findings of this study clarified the roles of root exudate components in affecting the behaviors of polybrominated diphenyl ethers (PBDEs) in soils.

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Section: Soils and Closed-bottle Moist Microcosmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influences of artificial root exudate components on the behaviors of BDE-28 and BDE-47 in soils: desorption, availability, and biodegradation

Huang

Wang

et al. 2016

Environ Sci Pollut Res

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“…Root exudation is now considered to be the most important factor in the mediation of hydrocarbon biodegradation in the rhizosphere [54, 67,104,141,[227][228][229][230][231][232]. Root exudates serve as a carbon source and energy for microorganisms, and also improve the hydrocarbon degradation in the rhizosphere by stimulating hydrocarbon-degrader populations [67].…”

Section: Impact Of Root Exudates On Hydrocarbon Degradationmentioning

confidence: 99%

Root Exudation: The Ecological Driver of Hydrocarbon Rhizoremediation

2016

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Rhizoremediation is a bioremediation technique whereby microbial degradation of organic contaminants occurs in the rhizosphere. It is considered to be an effective and affordable "green technology" for remediating soils contaminated with petroleum hydrocarbons. Root exudation of a wide variety of compounds (organic, amino and fatty acids, carbohydrates, vitamins, nucleotides, phenolic compounds, polysaccharides and proteins) provide better nutrient uptake for the rhizosphere microbiome. It is thought to be one of the predominant drivers of microbial communities in the rhizosphere and is therefore a potential key factor behind enhanced hydrocarbon biodegradation. Many of the genes responsible for bacterial adaptation in contaminated soil and the plant rhizosphere are carried by conjugative plasmids and transferred among bacteria. Because root exudates can stimulate gene transfer, conjugation in the rhizosphere is higher than in bulk soil. A better understanding of these phenomena could thus inform the development of techniques to manipulate the rhizosphere microbiome in ways that improve hydrocarbon bioremediation.

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“…These results agreed with the conclusion of Gao [16], who concluded that enhanced dissipation of PAHs in planted soil was mainly because of the plant-promoted biodegradation, but the contribution of plant uptake and accumulation was negligible. Plants may contribute to the biodegradation of organic compounds through increasing the microbial numbers [17], promoting the microbial activity [18] and modifying the microbial community in the rhizosphere [18], and thus cause the massive input of easily degradable organic substances, the improvement of physical and chemical soil conditions, and increased humidity and adsorption of pollutants in the rhizosphere. The plantpromoted biodegradation of HMW-PAHs in the sludge should be the comprehensive results of the above factors in this study.…”

Section: Removal Percentages Of Hmw-pahs From the Sludge By Awnless Bmentioning

confidence: 99%

Effects of Two kinds of Herbage Crops on the Removal of High Molecular Weight Polycyclic Aromatic Hydrocarbons in Sludge

Feng¹,

Wang²,

Shi³

et al. 2016

JRST

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ABSTRACT:The purpose of this study was to compare the effects of two herbage crops (awnless brome and alfalfa) on the removal of high molecular weight polycyclic aromatic hydrocarbons (HMW-PAHs) in sludge, including 9 PAHs. The results showed that Awnless brome and alfalfa had similar removal percentages for the total Σ9 HMWPAHs in the sludge, which were 85.75% and 85.08%, respectively. However, these two plants were different in the removal percentages of individual PAHs, for example, awnless brome had higher removal percentages for the 4-ring compounds (Pyr, BaA, Chry, BbF and BKF), while alfalfa showed higher removal percentages for the 5-ring and 6-ring compounds (BaP, DbA, Bghip and InP). The activities of catalase and polyphenol oxidase in the sludge planted with alfalfa were significantly higher than those in the sludge with awnless brome, while the activities of dehydrogenase in these two kinds of sludge were opposite. In conclusion, awnless brome and alfalfa could be directly used for the remediation of HMW-PAHs-polluted sludge, and awnless brome inclined to degrade the HMW-PAHs with 4 rings, while alfalfa tended to degrade the HMW-PAHs with 5 and 6 rings.

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Nutritional constraints to degradation of polycyclic aromatic hydrocarbons in a simulated rhizosphere

Cited by 194 publications

References 32 publications

Influences of artificial root exudate components on the behaviors of BDE-28 and BDE-47 in soils: desorption, availability, and biodegradation

Influences of artificial root exudate components on the behaviors of BDE-28 and BDE-47 in soils: desorption, availability, and biodegradation

Root Exudation: The Ecological Driver of Hydrocarbon Rhizoremediation

Effects of Two kinds of Herbage Crops on the Removal of High Molecular Weight Polycyclic Aromatic Hydrocarbons in Sludge

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