The role of root exuded low molecular weight organic anions in facilitating petroleum hydrocarbon degradation: Current knowledge and future directions

Martin, Belinda C.; George, Suman; Price, Charles A.; Ryan, Megan H.; Tibbett, Mark

doi:10.1016/j.scitotenv.2013.11.050

Cited by 224 publications

(102 citation statements)

References 186 publications

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“…Biological activity, especially root exudation, has been demonstrated to significantly affect the behaviors of organic contaminants in soils (Luo et al 2006;Zhu et al 2009;Balseiro-Romero et al 2014;Martin et al 2014;He et al 2015). Some studies have evidenced the effects of root exudates on the desorption and availability of organic contaminants in soils.…”

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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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: 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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“…Plants improve soil structure and, therefore, aeration and hydrological aspects that may impose limitations on biodegradation. Additionally, plants may exude oxidative enzymes (for example, oxidoreductase was liberated by plant roots) and low-molecular-weight organic anions that contribute to organic pollutant degradation [39][40][41]. Finally, plant roots provide a pathway for the easy degradation of carbon and energy sources that generally increase microbial activity in soil, which may ultimately lead to enhanced degradation of organic pollutants through direct metabolism or co-metabolism [42].…”

Section: Biodegradation Of Ddts and Hchs In Soilmentioning

confidence: 99%

Biodegradation of Dichlorodiphenyltrichloroethanes (DDTs) and Hexachlorocyclohexanes (HCHs) with Plant and Nutrients and Their Effects on the Microbial Ecological Kinetics

Sun

Zhang

Hu³

et al. 2014

Microb Ecol

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Four pilot-scale test mesocosms were conducted for the remediation of organochlorine pesticides (OCPs)-contaminated aged soil. The results indicate that the effects on degradation of hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs) were in the following order: nutrients/plant bioaugmentation (81.18 % for HCHs; 85.4 % for DDTs) > nutrients bioaugmentation > plant bioaugmentation > only adding water > control, and nutrients/plant bioaugmentation greatly enhanced the degradation of HCHs (81.18 %) and DDTs (85.4 %). The bacterial community structure, diversity and composition were assessed by 454-pyrosequencing of 16S recombinant RNA (rRNA), whereas the abundance of linA gene was determined by quantitative polymerase chain reaction. Distinct differences in bacterial community composition, structure, and diversity were a function of remediation procedure. Predictability of HCH/DDT degradation in soils was also investigated. A positive correlation between linA gene abundance and the removal ratio of HCHs was indicated by correlation analyses. A similar relationship was also confirmed between the degradation of HCHs/DDTs and the abundance of some assemblages (Gammaproteobacteria and Flavobacteria). Our results offer microbial ecological insight into the degradation of HCHs and DDTs in aged contaminated soil, which is helpful for the intensification of bioremediation through modifying plant-microbe patterns, and cessation of costly and time-consuming assays.

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“…Plant roots exude a wide array of compounds (e.g., amino acids, exoenzymes, secondary metabolites) which, when released in localized areas, may act synergistically to directly and/or indirectly enhance microbial PHC degradation (Kuiper et al, 2004;Martin et al, 2014). Therefore, the role of carboxylates in enhancing microbial PHC biodegradation may be greater in the presence of other root compounds (e.g., secondary metabolites) that enable a more diverse microbial community to be present.…”

Section: Limitations Of This Study and Future Researchmentioning

confidence: 99%

“…Plant roots provide favorable conditions for rhizosphere microorganisms largely through the exudation of substrates that allow increased growth and activity (e.g., amino acids, carbohydrates and organic acids). It has been speculated that the increase in microbial growth and activity that is driven by root exudates accelerates the rate of PHC biodegradation within the rhizosphere (Anderson et al, 1993;Nie et al, 2011;Martin et al, 2014;Phillips et al, 2012;Shahsavari et al, 2015). For instance, root exudates have been linked to enhanced PHC degradation for plants grown in situ (Joner and Leyval, 2003;Gao et al, 2011) and in batch experiments in which exudates collected from plant roots were added to contaminated soils (Miya and Firestone, 2001;Yoshitomi and Shann, 2001;Xie et al, 2012).…”

Section: Introductionmentioning

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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The role of root exuded low molecular weight organic anions in facilitating petroleum hydrocarbon degradation: Current knowledge and future directions

Cited by 224 publications

References 186 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

Biodegradation of Dichlorodiphenyltrichloroethanes (DDTs) and Hexachlorocyclohexanes (HCHs) with Plant and Nutrients and Their Effects on the Microbial Ecological Kinetics

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

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