Degradation and detoxification of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) by an indigenous Delftia sp. strain in batch and continuous systems

González, Ana Julieta; Gallego, Alfredo; Gemini, Virginia L.; Papalia, Mariana Andrea; Radice, Marcela; Gutkind, Gabriel; Planes, Estela; Korol, S.

doi:10.1016/j.ibiod.2011.09.010

Cited by 59 publications

(23 citation statements)

References 38 publications

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“…Zabaloy et al (2010) thought that low rates of 2, 4-D did not affect heterotrophic bacteria counts, our experimental results supported these conclusions, addition of 2, 4-Dbe increased numbers of heterotrophic nitrifying bacteria. Because González et al (2012) and Han et al (2015) have isolated an indigenous bacterial strain which utilize 2, 4-D as the sole carbon and energy source from a polluted river and from a soil of growing wheat with a longterm history of herbicide use, respectively. However, nitrifying bacteria appeared to be the most sensitive microorganisms to napropamide (Cycoń et al, 2013), the conclusion also was supported by our experimental results with herbicide 2, 4-D.…”

Section: Discussionmentioning

confidence: 99%

Impact of Herbicide 2, 4-Dichlorophenoxyacetic Acid Butyl Ester on Soil Nitrogen-transforming Bacterial Populations in Two Soils

Ding¹

2017

IJAB

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Herbicides applied to the field affect the soil microbial community. Here, we evaluated the impact of the herbicide 2,4-dichlorophenoxyacetic acid butyl ester (2, 4-Dbe) on the microbial community and nitrogen-transforming bacterial populations at three doses of 0, 5 (field application rate) and 50 mg (ten-fold field rate) active ingredient (a.i.) kg -1 dry soil applied to Oxisol and Fluvo-aquic soils in the laboratory, respectively. After addition of 2, 4-Dbe, the populations of aerobic bacteria and actinomycete significantly depressed in the Oxisol soil (pH 5.9), while promoted in the Fluvo-aquic soil (pH 8.3). An increasing dose of 2, 4-Dbe combined with much less fungal populations in both soils (p < 0.05). Application of 5 mg a.i. 2, 4-Dbe significantly stimulated ammonifiers, and had no influence on nitroso-bacteria and denitrifying bacteria; 50 mg a.i. 2, 4-Dbe inhibited all of them (p < 0.05). Both doses of 2, 4-Dbe inhibited autotrophic nitrifying bacteria, but stimulated heterotrophic nitrifying bacteria in both soils (p < 0.05). These results revealed that the sensitivity of different microbial species to 2, 4-Dbe differed significantly, and the impacts were also associated with herbicide application rates and soil types. Fungi and autotrophic nitrifying bacteria are more sensitive, and heterotrophic nitrifying bacteria are insensitive to 2, 4-Dbe toxicity.

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Section: Discussionmentioning

confidence: 99%

Impact of Herbicide 2, 4-Dichlorophenoxyacetic Acid Butyl Ester on Soil Nitrogen-transforming Bacterial Populations in Two Soils

Ding¹

2017

IJAB

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“…Also, the application of these sequential biological processes in biofilm reactors is a very promising approach to industrial applications. We previously used a similar reactor design to the biodegradation of several xenobiotic compounds, such as the herbicide 2,4‐dichlorophenoxyacetic acid and cresols . This demonstrates the versatility of the reactor and therefore its applicability for the removal of a wide variety of persistent and toxic compounds from liquid effluents.…”

Section: Discussionmentioning

confidence: 99%

“…Characterization and identification of the PCA‐degrading microorganisms were carried out by Gram‐staining and 16S rRNA gene sequencing. The technique for the 16S rRNA gene sequencing was described in a previous investigation .…”

Section: Methodsmentioning

confidence: 99%

Biodegradation of p‐Chloroaniline and Ammonium Removal in Continuous Biofilm Reactors

González

Bautista

Papalia

et al. 2013

CLEAN Soil Air Water

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In this investigation, we isolated from an industrial effluent a bacterial community capable of utilizing p-chloroaniline (PCA) as the sole source of carbon and nitrogen. The isolates were identified as Pseudomonas sp., Achromobacter sp., and Sphingopyxis sp. The bacterial community was employed to set up a continuous system for PCA degradation and ammonium removal. The system consists in two sequential aerobic fixed-bed reactors, for PCA biodegradation and nitrification respectively, and an anoxic reactor for denitrification. Biodegradation process was evaluated by chemical analysis of PCA, chloride and ammonium, and bacterial count. Nitrification and denitrification processes were evaluated by chemical analysis of ammonium, nitrite and nitrate, and nitrifying bacteria count. Bioassays of acute toxicity using the standard organisms Vibrio fischeri, Pseudokirchneriella subcapitata, and Daphnia magna were performed in order to assess detoxification. An average efficiency of 88.5%, expressed as PCA removal, was achieved in the biodegradation process. The maximum PCA removal rate reached 11.7 g/m 3 day. PCA degradation was associated with the release of chloride and ammonium. Ammonium was completely removed by the nitrification/denitrification process. Toxicity was not detected after the biodegradation process.

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“…Over the past decade, a variety of thermophilic (Rye et al 2009), psychrophilic (Drienovska et al 2012;Novak et al 2013), and non-extremophilic microbes capable of degrading 2,4-D (Fulthorpe et al 1995;González et al 2012;Kumar et al 2014;Samir et al 2015) have been isolated from contaminated marine environments (Chiba et al 2009;Fulthorpe et al 1995;González et al 2012;Kumar et al 2014;Novak et al 2014;Samir et al 2015). However, studies on bioremediation of chlorinated compounds under hypersaline environments are sparse.…”

Section: Degradation Of Halogenated Hydrocarbons By Halophilic Bactermentioning

confidence: 99%

Halophiles: biology, adaptation, and their role in decontamination of hypersaline environments

Edbeib

Wahab

Huyop

2016

World J Microbiol Biotechnol

138

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The unique cellular enzymatic machinery of halophilic microbes allows them to thrive in extreme saline environments. That these microorganisms can prosper in hypersaline environments has been correlated with the elevated acidic amino acid content in their proteins, which increase the negative protein surface potential. Because these microorganisms effectively use hydrocarbons as their sole carbon and energy sources, they may prove to be valuable bioremediation agents for the treatment of saline effluents and hypersaline waters contaminated with toxic compounds that are resistant to degradation. This review highlights the various strategies adopted by halophiles to compensate for their saline surroundings and includes descriptions of recent studies that have used these microorganisms for bioremediation of environments contaminated by petroleum hydrocarbons. The known halotolerant dehalogenase-producing microbes, their dehalogenation mechanisms, and how their proteins are stabilized is also reviewed. In view of their robustness in saline environments, efforts to document their full potential regarding remediation of contaminated hypersaline ecosystems merits further exploration.

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Degradation and detoxification of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) by an indigenous Delftia sp. strain in batch and continuous systems

Cited by 59 publications

References 38 publications

Impact of Herbicide 2, 4-Dichlorophenoxyacetic Acid Butyl Ester on Soil Nitrogen-transforming Bacterial Populations in Two Soils

Impact of Herbicide 2, 4-Dichlorophenoxyacetic Acid Butyl Ester on Soil Nitrogen-transforming Bacterial Populations in Two Soils

Biodegradation of p‐Chloroaniline and Ammonium Removal in Continuous Biofilm Reactors

Halophiles: biology, adaptation, and their role in decontamination of hypersaline environments

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