Bioaugmentation of chlorothalonil-contaminated soil with hydrolytically or reductively dehalogenating strain and its effect on soil microbial community

Xu, Xihui; Liu, Xiaomei; Zhang, Long; Mu, Yang; Zhu, Xu-Yuan; Fang, Jingya; Li, Shunpeng; Jiang, Jiandong

doi:10.1016/j.jhazmat.2018.03.002

Cited by 46 publications

(14 citation statements)

References 80 publications

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“…Interactions between community members are dynamic and complex (Xu X. H. et al, 2018). The microbial community composition and relationship between their members not only affect the catabolic efficiency of pollutants but also determine the final fate of pollutants (Kato et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Shift in Bacterial Community Structure Drives Different Atrazine-Degrading Efficiencies

et al. 2019

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Compositions of pollutant-catabolic consortia and interactions between community members greatly affect the efficiency of pollutant catabolism. However, the relationships between community structure and efficiency of catabolic function in pollutant-catabolic consortia remain largely unknown. In this study, an original enrichment (AT) capable of degrading atrazine was obtained. And two enrichments – with a better/worse atrazine-degrading efficiency (ATB/ATW) – were derived from the original enrichment AT by continuous sub-enrichment with or without atrazine. Subsequently, an Arthrobacter sp. strain, AT5, that was capable of degrading atrazine was isolated from enrichment AT. The bacterial community structures of these three enrichments were investigated using high-throughput sequencing analysis of the 16S rRNA gene. The atrazine-degrading efficiency improved as the abundance of Arthrobacter species increased in enrichment ATB. The relative abundance of Arthrobacter was positively correlated with those of Hyphomicrobium and Methylophilus, which enhanced atrazine degradation via promoting the growth of Arthrobacter. Furthermore, six genera/families such as Azospirillum and Halomonas showed a significantly negative correlation with atrazine-degrading efficiency, as they suppressed atrazine degradation directly. These results suggested that atrazine-degrading efficiency was affected by not only the degrader but also some non-degraders in the community. The promotion and suppression of atrazine degradation by Methylophilus and Azospirillum/Halomonas, respectively, were experimentally validated in vitro, showing that shifts in both the composition and abundance in consortia can drive the change in the efficiency of catabolic function. This study provides valuable information for designing enhanced bioremediation strategies.

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Section: Introductionmentioning

confidence: 99%

Shift in Bacterial Community Structure Drives Different Atrazine-Degrading Efficiencies

et al. 2019

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“…This result verified the previous speculation that degrading bacteria could not remain active for a long time, which might be the main reason for the reduced mineralization rate shown in Figure . Several researchers have demonstrated that the survival of degrading bacteria added to the soil is key to successful bioaugmentation. , In addition, the survival ability of degrading strains in different soils indicates that the type of soil is not the main factor affecting the survival of degrading strains. These results can provide insights toward improved methods of inoculation for contaminant remediation.…”

Section: Resultsmentioning

confidence: 99%

“…Our recent study has shown that the CPF degrading strains can enhance the dissipation of CPF and promote the mineralization of BRs, thereby reducing the persistence of CPF in soil . However, it is well known that bioaugmentation is greatly affected by environmental factors, especially soil types . It is necessary to verify the effect of bioaugmentation for CPF in various kinds of soil.…”

Section: Introductionmentioning

confidence: 99%

Reducing the Environmental Risk of Chlorpyrifos Application through Appropriate Agricultural Management: Evidence from Carbon-14 Tracking

Jia

Shen

et al. 2021

J. Agric. Food Chem.

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Chlorpyrifos (CPF) is one of the most critical insecticides in the world. However, many countries are gradually banning its use due to its reported hazardous impacts on humans. This study explored the possibility of reducing the environmental risk of CPF through appropriate agricultural management practices. Results showed that the environmental risk of CPF is lower under drainage conditions because there is more mineralization and less bound residues (BRs) than under submerged conditions. Bioaugmentation significantly enhanced the CPF mineralization and inhibited the formation of CPF-BRs. Biochar adsorbed CPF and thus reduced its bioavailability, but it could not completely eliminate the toxicity of CPF. In addition, bioaugmentation did not significantly affect the native microbial community of CPF-contaminated soil, suggesting its safety in reducing the environmental risk of CPF. The study indicated that the environmental risk of CPF could be reduced by appropriate agricultural management such as water management, bioaugmentation, soil biochar amendment, and selecting suitable soil types.

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“…Hence, their presence is indispensable for ensuring and sustaining the proper functions of soil ecosystems (Swędrzyńska and Małecka-Jankowiak 2017). However, these favorable conditions may be disturbed by, e.g., stress posed by the appearance of toxic substances which can be harmful to microorganisms (Nowak et al 2013;Xu et al 2018). According to Wang et al (2012), fungicides may trigger significant changes in the proliferation of microorganisms as well as in their structure and diversity.…”

Section: Microbiological Properties Of Soilmentioning

confidence: 99%

Biostimulation as a process aiding tebuconazole degradation in soil

Baćmaga

Kucharski

2019

J Soils Sediments

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Purpose The purpose of this study was to compare effects of two biostimulating substances (compost and bird droppings) on the proliferation of microorganisms, enzymatic activity, and resistance of spring barley in soil exposed to tebuconazole fungicide. Both biostimulating substances were also assessed for their efficacy in tebuconazole degradation in soil. Materials and methods A pot vegetation experiment was performed with soil belonging to the Eutric Cambisols to test the effect of tebuconazole on the biological activity of soil. Its adverse effect on the biological properties of soil was minimized through the use of biostimulating substances (compost and bird droppings), the effect of which was expressed with the IF C/BD index. The RCh index was used to determine the effect of tebuconazole on the proliferation of soil microorganisms and enzymes, the BA 21 index was used to express soil fertility based on the activity of soil enzymes, whereas the RS index-to express the resistance of spring barley to the administered doses of tebuconazole. Finally, analyses were conducted to determine the efficacy of soil amendment with biostimulating substances in tebuconazole degradation. Results and discussion Study results demonstrate that tebuconazole caused significant changes in the proliferation of the tested groups of microorganisms, in the activity of soil enzymes, and in spring barley yield. It was especially noticeable in pots in which the soil was exposed to its highest dose, i.e., 2.499 mg kg −1. Soil supplementation with bird droppings had a positive effect on the development of soil microorganisms and on the enzymatic activity in the soil. In turn, compost addition to soil exerted various effects on the biological properties of soil. Both biostimulating substances failed to improve spring barley yield. Tebuconazole degradation was more intense in the soil fertilized with bird droppings than with compost. Conclusions Results of this study suggest that tebuconazole can affect the stability and health status of soil ecosystems by modifying their biological properties. The high sensitivity of soil microorganisms and enzymes to stress conditions makes them reliable environmental bioindicators. The strive for eliminating the adverse impact of fungicides on soil microbiome through the use of appropriate remediation methods, like, e.g., biostimulation, is of greater concern from the ecological perspective.

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Bioaugmentation of chlorothalonil-contaminated soil with hydrolytically or reductively dehalogenating strain and its effect on soil microbial community

Cited by 46 publications

References 80 publications

Shift in Bacterial Community Structure Drives Different Atrazine-Degrading Efficiencies

Shift in Bacterial Community Structure Drives Different Atrazine-Degrading Efficiencies

Reducing the Environmental Risk of Chlorpyrifos Application through Appropriate Agricultural Management: Evidence from Carbon-14 Tracking

Biostimulation as a process aiding tebuconazole degradation in soil

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