Can root exudate components influence the availability of pyrene in soil?

Sun, Bо; Ling, Wanting; Wang, Yi–Ze

doi:10.1007/s11368-013-0712-4

Cited by 29 publications

(6 citation statements)

References 49 publications

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“…During plant growth, roots release exudates mainly composed of sugars, organic acids and amino acids ([ 9 , 10 , 11 ]) that constitute carbon sources for microorganisms. Root exudates can enhance PAH bioavailability ([ 12 , 13 , 14 ]), increase and activate rhizospheric microbes, and help them to degrade pollutants ([ 15 , 16 ]) by selecting PAH-degraders ([ 17 , 18 ]). Thus several studies carried out in artificially ([ 19 , 20 , 12 , 21 ]) or historically [ 22 ] contaminated soils report that PAH degradation is higher in plant rhizosphere than in non-planted soil.…”

Section: Introductionmentioning

confidence: 99%

Mapping the Centimeter-Scale Spatial Variability of PAHs and Microbial Populations in the Rhizosphere of Two Plants

et al. 2015

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Rhizoremediation uses root development and exudation to favor microbial activity. Thus it can enhance polycyclic aromatic hydrocarbon (PAH) biodegradation in contaminated soils. Spatial heterogeneity of rhizosphere processes, mainly linked to the root development stage and to the plant species, could explain the contrasted rhizoremediation efficiency levels reported in the literature. Aim of the present study was to test if spatial variability in the whole plant rhizosphere, explored at the centimetre-scale, would influence the abundance of microorganisms (bacteria and fungi), and the abundance and activity of PAH-degrading bacteria, leading to spatial variability in PAH concentrations. Two contrasted rhizospheres were compared after 37 days of alfalfa or ryegrass growth in independent rhizotron devices. Almost all spiked PAHs were degraded, and the density of the PAH-degrading bacterial populations increased in both rhizospheres during the incubation period. Mapping of multiparametric data through geostatistical estimation (kriging) revealed that although root biomass was spatially structured, PAH distribution was not. However a greater variability of the PAH content was observed in the rhizosphere of alfalfa. Yet, in the ryegrass-planted rhizotron, the Gram-positive PAH-degraders followed a reverse depth gradient to root biomass, but were positively correlated to the soil pH and carbohydrate concentrations. The two rhizospheres structured the microbial community differently: a fungus-to-bacterium depth gradient similar to the root biomass gradient only formed in the alfalfa rhizotron.

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Section: Introductionmentioning

confidence: 99%

Mapping the Centimeter-Scale Spatial Variability of PAHs and Microbial Populations in the Rhizosphere of Two Plants

et al. 2015

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“…The significant decrease of adsorbed fraction in pyrene contaminated soils treated by root components indicated that pyrene bioaccessibility was enhanced to a great extent by the root components. Similarly, it was also showed that root exudates could improve the availability of PAHs in previous studies (Sun et al, 2013). High level of soil organic substances could inhibit desorption of PAHs in the soil and decline their accessibility to microorganisms.…”

Section: Discussionmentioning

confidence: 71%

“…The fractionation of PAHs in the soil can be detected by sequential extraction method (Duan et al, 2015). Someone thinks that organic acids and amino acids from root components can enhance the bioaccessibility of pyrene, probably by breaking the "bridges" of soil complexes formed through the linkage of metallic cations between soil minerals and SOM (Sun et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Influence of root components of celery on pyrene bioaccessibility, soil enzymes and microbial communities in pyrene and pyrene-diesel spiked soils

Wei

Zhang

Liu

et al. 2017

Science of The Total Environment

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Though phytoremediation is deemed as a promising approach to restore polycyclic aromatic hydrocarbon (PAHs) contaminated sites, studies about how the biodegradation of PAHs is enhanced still remains incomprehensive. Effects of root components on pyrene bioaccessibility, soil enzymes and microbial communities were explored in the paper, and their interactions in simulated pyrene and pyrene-diesel spiked microcosms were tried to give a reasonable explanation. Results indicated that root components enhanced the pyrene removal of bioaccessible and adsorbed fractions by 16.10 and 1.80mgkg, respectively, in pyrene-spiked soils at the end of the experiment. By contrast, root components increased the degradation of bioaccessible fraction by only 3.3mgkg in pyrene-diesel spiked soils. Although the bound fractions of pyrene increased over time in treatments without root components, they remained relatively stable, ranging from 0.02 to 0.03mgkg, in root components amended treatments. Activities of soil enzymes (polyphenol oxidase, catalase, invertase, urease and alkaline phosphatase) varied differently in response to pollutants and root components. Analysis of phospholipid fatty acids revealed that root components increased the biomass of soil microorganisms and altered the microbial structure. Pearson correlation analysis proved positive correlations between all the microbial subgroups and pyrene removal in pyrene-spiked soils, but the degradation of bioaccessible pyrene was only positively related with microorganisms confirmed by monounsaturated fatty acids in pyrene-diesel spiked soils.

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“…Various root exudates such as sugars, growth regulators, amino acids, organic acids, phenolic acids, flavonoids, enzymes, fatty acids, nucleotides, tannins, steroids, terpenoids, alkaloids, polyacetylenes, phytosiderophores, and vitamines have been detected in rhizosphere (Seigler, 1996; Dakora and Phillips, 2002). The nature and diversity of root exudations is highly influenced by the plant genotype, developmental stage, a multitude of environmental factors (soil properties, temperature, pH, humidity, nutrients), rhizosphere microbiome and the application of pesticides (Bais et al, 2006; Dinelli et al, 2007; Sun et al, 2013; Lu et al, 2015). Apart from endogenous exudates, plants are capable of exuding pesticides applied to aerial part of plants (Dinelli et al, 2007).…”

Section: The Plant As Metaorganism and Soil Applied Pesticidesmentioning

confidence: 99%

The Plant as Metaorganism and Research on Next-Generation Systemic Pesticides – Prospects and Challenges

Vryzas

2016

Front. Microbiol.

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Systemic pesticides (SPs) are usually recommended for soil treatments and as seed coating agents and are taken up from the soil by involving various plant-mediated processes, physiological, and morphological attributes of the root systems. Microscopic insights and next-generation sequencing combined with bioinformatics allow us now to identify new functions and interactions of plant-associated bacteria and perceive plants as meta-organisms. Host symbiotic, rhizo-epiphytic, endophytic microorganisms and their functions on plants have not been studied yet in accordance with uptake, tanslocation and action of pesticides. Root tips exudates mediated by rhizobacteria could modify the uptake of specific pesticides while bacterial ligands and enzymes can affect metabolism and fate of pesticide within plant. Over expression of specific proteins in cell membrane can also modify pesticide influx in roots. Moreover, proteins and other membrane compartments are usually involved in pesticide modes of action and resistance development. In this article it is discussed what is known of the physiological attributes including apoplastic, symplastic, and trans-membrane transport of SPs in accordance with the intercommunication dictated by plant–microbe, cell to cell and intracellular signaling. Prospects and challenges for uptake, translocation, storage, exudation, metabolism, and action of SPs are given through the prism of new insights of plant microbiome. Interactions of soil applied pesticides with physiological processes, plant root exudates and plant microbiome are summarized to scrutinize challenges for the next-generation pesticides.

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Can root exudate components influence the availability of pyrene in soil?

Cited by 29 publications

References 49 publications

Mapping the Centimeter-Scale Spatial Variability of PAHs and Microbial Populations in the Rhizosphere of Two Plants

Mapping the Centimeter-Scale Spatial Variability of PAHs and Microbial Populations in the Rhizosphere of Two Plants

Influence of root components of celery on pyrene bioaccessibility, soil enzymes and microbial communities in pyrene and pyrene-diesel spiked soils

The Plant as Metaorganism and Research on Next-Generation Systemic Pesticides – Prospects and Challenges

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