The influence of root exudates of maize and soybean on polycyclic aromatic hydrocarbons degradation and soil bacterial community structure

Guo, Ming; Gong, Zongqiang; Miao, Renhui; Su, Dan; Li, Xiaojun; Jia, Chunyun; Zhuang, Jie

doi:10.1016/j.ecoleng.2016.11.018

Cited by 81 publications

(34 citation statements)

References 46 publications

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“…These root exudates may enrich the rhizosphere and serve as readily-mineralisable carbon sources for microorganisms involved in symbiotic rootmicrobe interactions (Bais et al, 2006;Wenzel, 2009). Continuous mineralisation and incorporation of these carbon sources increases microbial biomass, thereby supporting microbial growth, activity, and contaminant biodegradation (Guo et al, 2017). Such symbiotic root-microbe interactions in soil have been previously reported for M. sativa (Fan et al, 2008) and S. bicolor (Banks et al, 2003;Muratova et al, 2009a).…”

Section: C-phenathrene Mineralisation In Unplanted and Planted Trementioning

confidence: 55%

Mineralisation of 14 C-phenanthrene in PAH-diesel contaminated soil: Impact of Sorghum bicolor and Medicago sativa mono- or mixed culture

Umeh

Vázquez-Cuevas

Semple

2018

Applied Soil Ecology

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Plant-assisted biodegradation can offer a cost-effective and sustainable approach for the bioremediation of PAHs in soil. As such, selecting the most appropriate plant species is important. The potential for plant-assisted biodegradation of complex PAH-diesel mixtures in soil by sorghum (Sorghum bicolor) and alfalfa (Medicago sativa) grown as monocultures and mixed cultures using 14 C-contaminants has not been widely reported. The objective of this study was to assess 14 C-phenanthrene mineralisation profiles in mixtures of PAH-diesel in soil in the presence of Sorghum bicolor and Medicago sativa. Soil was spiked with PAHs and diesel, after which M. sativa and S. bicolor were introduced and grown as mono-or mixedcultures. The toxicity of the PAH-diesel oil mixture in the planted treatments, as well as its effect on the mineralisation of 14 C-phenanthrene were evaluated. Monocultures of both plant species tolerated the complex PAH-diesel mixtures based on growth and survival, and increased rates and extents of 14 C-phenanthrene mineralisation in soil. The influence of PAH concentration on 14 C-phenanthrene mineralisation profiles varied in planted and unplanted treatments. The rates and extents of 14 C-phenanthrene mineralisation tended to decrease in diesel amended soil, especially at low PAH concentrations. To the best of the authors' knowledge, this is the first report of 14 C-phenanthrene mineralisation patterns in complex PAHdiesel oil mixtures contaminated soil especially with respect to the specified plant species. The findings offer new insights on mono-and multi-species phytotoxicity as well as plant-assisted biodegradation of PAH mixtures in soil which may be useful in the risk assessment and remediation of contaminated sites.

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Section: C-phenathrene Mineralisation In Unplanted and Planted Trementioning

confidence: 55%

Mineralisation of 14 C-phenanthrene in PAH-diesel contaminated soil: Impact of Sorghum bicolor and Medicago sativa mono- or mixed culture

Umeh

Vázquez-Cuevas

Semple

2018

Applied Soil Ecology

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“…4A, C), although significant declines in aboveground biomass occurred at higher proportions of P supplied as struvite. The strong crop species‐specific response to struvite and phytin is consistent with crop species differences in root exudate quantity and quality: maize root systems can secrete nearly threefold more exudate C than those of soybean (Gao et al, 2014; Guo et al, 2017). For phytin, no significant difference in aboveground biomass was found for up to 100 and 50% replacement of P as monoammonium phosphate (MAP) for maize and soybean, respectively (Fig.…”

Section: Agronomy Of Recovered Phosphorusmentioning

confidence: 66%

Toward a Regional Phosphorus (Re)cycle in the US Midwest

et al. 2019

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Redirecting anthropogenic waste phosphorus (P) flows from receiving water bodies to high P demand agricultural fields requires a resource management approach that integrates biogeochemistry, agronomy, engineering, and economics. In the US Midwest, agricultural reuse of P recovered from spatially colocated waste streams stands to reduce point‐source P discharges, meet agricultural P needs, and—depending on the speciation of recovered P—mitigate P losses from agriculture. However, the speciation of P recovered from waste streams via its chemical transformation—referred to here as recovered P (rP) differs markedly based on waste stream composition and recovery method, which can further interact with soil and crop characteristics of agricultural sinks. The solubility of rP presents key tensions between engineered P recovery and agronomic reuse because it defines both the ability to remove organic and inorganic P from aqueous streams and the crop availability of rP. The potential of rP generation and composition differs greatly among animal, municipal, and grain milling waste streams due to the aqueous speciation of P and presence of coprecipitants. Two example rP forms, phytin and struvite, engage in distinct biogeochemical processes on addition to soils that ultimately influence crop uptake and potential losses of rP. These processes also influence the fate of nitrogen (N) embodied in rP. The economics of rP generation and reuse will determine if and which rP are produced. Matching rP species to appropriate agricultural systems is critical to develop sustainable and financially viable regional exchanges of rP from wastewater treatment to agricultural end users. Core Ideas There is high potential for recovering P (rP) from point sources for agricultural reuse. rP speciation depends on recovery source and method, interacts with soils and crops. Engineering, agronomic, and economic considerations of rP are context‐specific.

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“…Temporal variations were also observed in the pot experiment conducted by Mayerhofer et al (2017). Changes in biotic factors represented by the addition of plants and insects as well as abiotic factors such as temperature or moisture (Dematheis et al, 2012;Guo et al, 2017;Poll, Marhan, Back, Niklaus, & Kandeler, 2013) may have caused these temporal effects. The addition of maize was probably responsible for the major part of the temporal changes in fungal communities.…”

Section: (E))mentioning

confidence: 90%

Response of soil microbial communities to the application of a formulatedMetarhizium brunneumbiocontrol strain

Mayerhofer

Rauch

Hartmann

et al. 2019

Biocontrol Science and Technology

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Entomopathogenic fungi are used for biological control of insect pests. Metarhizium brunneum Petch (Hypocreales) has potential to control Diabrotica virgifera virgifera LeConte (Chrysomelidae), which is a major pest of maize in North America and has recently invaded Europe. The inundative application of an entomopathogenic fungal strain in biological control results in high densities of fungal propagules in the soil which can potentially affect soil microbial communities and their multiple functions in soil. The objective of the present study was to assess potential effects of M. brunneum on soil fungal and prokaryotic communities in a pot experiment over a time course of 4 months using high-throughput sequencing (HTS) of ribosomal markers. The application of M. brunneum formulated as fungus colonised barley kernels (FCBK) led to a significant increase of the applied strain in soil, as assessed by cultivation-dependent (plating on selective medium followed by genotyping of Metarhizium isolates) and cultivation-independent (HTS of ribosomal markers) approaches. Data revealed that soil fungal and prokaryotic community structures did not change after the application of M. brunneum. Temporal changes of the fungal and prokaryotic communities were observed and the prokaryotic communities showed minor changes to barley kernels (BK), the matrix of the formulation. Results of this study are in accordance with other investigations lacking any evidence for adverse effects on microbial communities caused by applied entomopathogenic fungi.

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The influence of root exudates of maize and soybean on polycyclic aromatic hydrocarbons degradation and soil bacterial community structure

Cited by 81 publications

References 46 publications

Mineralisation of 14 C-phenanthrene in PAH-diesel contaminated soil: Impact of Sorghum bicolor and Medicago sativa mono- or mixed culture

Mineralisation of 14 C-phenanthrene in PAH-diesel contaminated soil: Impact of Sorghum bicolor and Medicago sativa mono- or mixed culture

Toward a Regional Phosphorus (Re)cycle in the US Midwest

Response of soil microbial communities to the application of a formulatedMetarhizium brunneumbiocontrol strain

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