Plant-Soil-Contaminant Specificity Affects Phytoremediation of Organic Contaminants

Chekol, Tesema; Vough, Lester R.; Chaney, Rufus L.

doi:10.1080/15226510208500070

Cited by 43 publications

(24 citation statements)

References 19 publications

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“…The low density of the GN PAH-RHD ␣ bacterial gene in the NM soil could be explained by the low PAH bioavailability in the NM soil. In aged PAH-contaminated soils, the strong adsorption of PAHs to soil particles, their sequestration in soil organic matter (11,35), and their low water solubility limit their bioavailability and thus their utilization as a carbon source for microorganisms. Indeed, some authors (49,50) found that the abundance of naphthalene dioxygenase genes (nahAc) could be increased by the addition of bioavailable hydrocarbons.…”

Section: Discussionmentioning

confidence: 99%

Influence of Vegetation on the In Situ Bacterial Community and Polycyclic Aromatic Hydrocarbon (PAH) Degraders in Aged PAH-Contaminated or Thermal-Desorption-Treated Soil

Cébron

Béguiristain

Faure

et al. 2009

Appl Environ Microbiol

108

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The polycyclic aromatic hydrocarbon (PAH) contamination, bacterial community, and PAH-degrading bacteria were monitored in aged PAH-contaminated soil (Neuves-Maisons [NM] soil; with a mean of 1,915 mg of 16 PAHs ⅐ kg ؊1 of soil dry weight) and in the same soil previously treated by thermal desorption (TD soil; with a mean of 106 mg of 16 PAHs ⅐ kg ؊1 of soil dry weight). This study was conducted in situ for 2 years using experimental plots of the two soils. NM soil was colonized by spontaneous vegetation (NM-SV), planted with Medicago sativa (NM-Ms), or left as bare soil (NM-BS), and the TD soil was planted with Medicago sativa (TD-Ms). The bacterial community density, structure, and diversity were estimated by real-time PCR quantification of the 16S rRNA gene copy number, temporal thermal gradient gel electrophoresis fingerprinting, and band sequencing, respectively. The density of the bacterial community increased the first year during stabilization of the system and stayed constant in the NM soil, while it continued to increase in the TD soil during the second year. The bacterial community structure diverged among all the plot types after 2 years on site. In the NM-BS plots, the bacterial community was represented mainly by Betaproteobacteria and Gammaproteobacteria. Polycyclic aromatic hydrocarbons (PAHs) are persistent organic pollutants associated with a wide range of anthropogenic activities (gas plants, wood preservation plants, waste incineration, coke production, and petrochemical industries). The intensive industrial coal mining during the 19th and 20th centuries in northern France caused contamination of large areas where the soil now needs to be remediated.Microbiological degradation is the chief process for natural elimination of PAHs from contaminated soil (9). A wide range of bacteria are able to degrade low-molecular-weight PAHs, such as naphthalene, phenanthrene, and anthracene, while the high-molecular-weight PAHs (with four or more fused aromatic rings) are more recalcitrant, and relatively few microorganisms are able to use them as a sole carbon source (8). The first hydroxylation step of the PAH ring is crucial to initiate an efficient biodegradation. This step is performed mainly by aerobic bacteria possessing a PAH-ring hydroxylating dioxygenase (PAH-RHD) system. Homologous PAH-RHD enzymes are encoded by specific genes present in both gram-positive (GP) and gram-negative (GN) bacterial species (22). Recently, we developed real-time PCR assays to quantify the functional genes encoding the catalytic ␣ subunit of the PAH-RHD (PAH-RHD ␣ ) enzyme. The quantifications were performed on soil DNA samples, giving important information about the PAH-degrading bacterial population present in various PAH-contaminated soils (7).High PAH degradation rates have been observed in laboratory experiments with strains or consortia isolated from PAHcontaminated soils (6, 33). However, in situ degradation is often a slower process due to environmental constraints and low availability of PAHs in aged, polluted ...

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Section: Discussionmentioning

confidence: 99%

Influence of Vegetation on the In Situ Bacterial Community and Polycyclic Aromatic Hydrocarbon (PAH) Degraders in Aged PAH-Contaminated or Thermal-Desorption-Treated Soil

Cébron

Béguiristain

Faure

et al. 2009

Appl Environ Microbiol

108

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“…Enhanced mineralisation of 2,4-dichlorophenoxyacetic acid (2,4-D) was shown in soil collected from the rhizosphere of Trifolium pratense (Shaw and Burns 2005). Chekol et al (2002) showed enhanced transformation of the explosive, trinitrotoluene (TNT) by the forage grasses Phalaris arundinacea and Panicum virgatum. Concentrations of the organochlorine p,p′-DDE (2,2-bis(p-chlorophenyl) 1,1-dichloroethylene), a metabolite of DDT, were significantly reduced in the rhizosphere of field-grown zucchini, pumpkin and spinach compared to bulk soil (White 2001).…”

Section: Introductionmentioning

confidence: 98%

Rhizosphere microbial community and hexachlorocyclohexane degradative potential in contrasting plant species

et al. 2007

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The organochlorine 1,2,3,4,5,6 hexachlorocyclohexane (HCH) is a broad-spectrum insecticide that was used on a large-scale worldwide. The soilplant-microbe system and its influence on HCH biodegradation are evaluated. A greenhouse experiment was designed to evaluate HCH dissipation and several microbial parameters among rhizosphere and bulk soil of two contrasting plants, Cytisus striatus (Hill) Rothm and Holcus lanatus L. Plants were grown for 180 days in three treatments: uncontaminated soil (control), uncontaminated soil inoculated with soil (3% w/w) from a HCH-contaminated site (INOC), and uncontaminated soil inoculated with soil (3% w/w) from the HCH-contaminated site and artificially contaminated to obtain 100 mg HCH kg −1 dry soil (100HCH-INOC). At harvest, plant biomass, soil water-extractable organic C, pH and Cl concentration, rhizosphere microbial densities (total heterotrophs, ammonifiers, amylolytics) and C substrate utilization patterns, and degradation of α-, β-, δ-and γ-HCH isomers were determined in bulk and rhizosphere soils. Soil solution Cl concentration was determined every 30 days throughout the entire growth period. Results demonstrate that both Cytisus striatus and Holcus lanatus can grow in soils with up to 100 mg HCH kg −1 . An enhanced degradation of α-HCH, but not β-or δ-HCH, was observed in the rhizosphere. Significant changes in the microbial densities were observed between bulk and rhizosphere soils of Cytisus, and an increase in C source utilization indicated changes in community level physiological profiles (CLPP) in the rhizosphere of this species when grown in contaminated soils. HCH dissipation was also greater in soils planted with this species. In accordance, increases in soil extractable C, Cl concentration and acidity were greater at the rhizosphere of Cytisus. Concentration of Cl in soil solutions also indicates greater HCH dechlorination in soils planted with Cytisus than Holcus. Results suggest that phytostimulation of bacteria present or added to soil is a promising approach to cleaning HCHcontaminated sites, and especially for biodegradation of α-HCH.

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“…The forage cultivars AUB, VEN, PAL, and MN-76 were the farthest away from the wild populations collected along Minnesota rivers and in wet meadows or ields (Figure 2). This included at least one forage cultivar, AUB ('Auburn'), which is most likely derived from native N. American strains ( Table 1) [7]. SUP ('Superior'), also derived from native N. American strains, was more closely aligned with some wild genotypes, particularly one from the wet meadow in Chanhassen, MN (8.II.F.3; Table 1).…”

Section: Discussionmentioning

confidence: 99%

“…Soil and water restoration projects have also used P. arundinacea for phytoremediation [7][8][9][10]. Wastewater treatment facilities employ P. arundinacea for removal of N [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Genetic Variability of US and Czech Phalaris Arundinacea L. Wild and Cultivated Populations

Kávová¹,

Kubátová²,

Čurn³

et al. 2018

New Perspectives in Forage Crops

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The spread of invasive plant species in natural habitats has become a worldwide problem with negative impacts. Phalaris arundinacea, an important forage and ornamental crop, is widespread worldwide. In recent years there has been a massive spread of P. arundinacea across North America and Canada. Production of Phalaris seed as a forage crop occurs in northern Minnesota; seeds are sold throughout the world, particularly in central Europe. We tested genetic similarities and diferences between populations in the US (Minnesota) and the Czech Republic using ISSRs to determine potential gene low for this forage crop.The cultivated forage and wild genotypes were dispersed into two groups that overlapped. At least four sets of wild US genotypes are dissimilar to European counterparts and potentially native to N. America. Future work to prove the ancestry of each accession will be necessary. Nonetheless, the sale of forage cultivars related to or derived from European types causes genetic mixing with N. American types. Part of this intercontinental gene low is exacerbated by the production of Phalaris forage seed in Minnesota. The implications of these indings for management of invasive crops native to both continents are signiicant for forage producers, managers, and breeders.

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Plant-Soil-Contaminant Specificity Affects Phytoremediation of Organic Contaminants

Cited by 43 publications

References 19 publications

Influence of Vegetation on the In Situ Bacterial Community and Polycyclic Aromatic Hydrocarbon (PAH) Degraders in Aged PAH-Contaminated or Thermal-Desorption-Treated Soil

Influence of Vegetation on the In Situ Bacterial Community and Polycyclic Aromatic Hydrocarbon (PAH) Degraders in Aged PAH-Contaminated or Thermal-Desorption-Treated Soil

Rhizosphere microbial community and hexachlorocyclohexane degradative potential in contrasting plant species

Genetic Variability of US and Czech Phalaris Arundinacea L. Wild and Cultivated Populations

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