Degradation of atrazine by Pseudomonas: N-dealkylation and dehalogenation of atrazine and its metabolites

Behki, R. M.; Khan, Shahamat U.

doi:10.1021/jf00070a039

Cited by 216 publications

(125 citation statements)

References 18 publications

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“…Our findings are consistent with those of similar studies in the literature (Behki and Khan 1986;Entry et al 1994Entry et al , 1995Alvey and Crowley 1995). In vitro studies have shown that high N concentrations in media inhibit herbicide mineralization by mycorrhizal fungi (Donnelly et al1993;Donnelly and Fletcher 1994).…”

Section: Discussionsupporting

confidence: 93%

“…In this study, we found that the addition of 400 kg N ha' reduced active bacterial biomass in both soils. High N concentrations may stimulate fungal activity in soil, but also act to suppress the enzymes catechol 2,3-oxygenase and protocatecuate 2,3-oxygenase which catalyze the degradation of ring structures of aromatic herbicides (Behki and Khan 1986;Erickson and Lee 1989;Aust 1990;Shuichiro et al 1991). …”

Section: Discussionmentioning

confidence: 99%

“…Atrazine and 2,4-D could have been degraded to a variety of intermediate compounds. Fungi and bacteria that degrade atrazine via dealkylation produce intermediate compounds that are toxic to some plants and soil microorganisms (Behki and Khan 1986;Alvey and Crowley 1995).…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of nitrogen on atrazine and 2, 4 dichlorophenoxyacetic acid mineralization in blackwater and redwater forested wetland soils

Entry¹

1999

Biology and Fertility of Soils

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Microcosms were used to determine the influence of N additions on active bacterial and fungal biomass, atrazine and dichlorophenoxyacetic acid (2,4-D) mineralization at 5, 10 and 15 weeks in soils from blackwater and redwater wetland forest ecosystems in the northern Florida Panhandle. Active bacterial and fungal biomass was determined by staining techniques combined with direct microscopy. Atrazine and 2,4-D mineralization were measured radiometrically. Treatments were: soil type, (blackwater or redwater forested wetland soils) and N additions (soils amended with the equivalent of 0, 200 or 400 kg N ha" as NH 4NO3). Redwater soils contained higher concentrations of C, total N, P, K, Ca, Mn, Fe, B and Zn than blackwater soils. After N addition and 15 weeks of incubation, active bacterial biomass in redwater soils was lower when N was added. Active bacterial biomass in blackwater soils was lower when 400 kg N ha-1 , but not when 200 kg N ha', was added. Active fungal biomass in blackwater soils was higher when 400 kg N ha-1 , but not when 200 kg N ha', was added. Active fungal biomass in redwater soils was lower when 200 kg N ha-1 , but not when 400 kg N ha', was added. After 15 weeks of incubation 2,4-D degradation was higher in redwater wetland soils than in blackwater soils. After 10 and 15 weeks of incubation the addition of 200 or 400 kg N ha' decreased both atrazine and 2,4-D degradation in redwater soils. The addition of 400 kg N ha' decreased 2,4-D degradation but not atrazine degradation in blackwater soils after 10 and 15 weeks of incubation. High concentrations of N in surface runoff and groundwater resulting from agricultural operations may have resulted in the accumulation of N in many wetland soils. Large amounts of N accumulating in wetlands may decrease mineralization of toxic agricultural pesticides.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of nitrogen on atrazine and 2, 4 dichlorophenoxyacetic acid mineralization in blackwater and redwater forested wetland soils

Entry¹

1999

Biology and Fertility of Soils

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“…They isolated three bacteria strains (Pseudomonas family) capable of utilizing atrazine as the sole source of carbon (Behki & Khan, 1986). Those bacteria use the side-chain carbon, thus N-dealkylation resulting in desisopropylatrazine and desethylatrazine was observed.…”

Section: Biodegradation Of Triazinesmentioning

confidence: 99%

A Critical View of the Photoinitiated Degradation of Herbicides

Klementová¹

2012

Herbicides - Properties, Synthesis and Control of Weeds

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“…These three compounds would be further degraded to more polar metabolites. The Microbial metabolism of atrazine in terrestrial and/or aquatic environments has been well documented 1,5,10,13,15,16) . The metabolites detected in the present study have been commonly reported (Details are summarized in "The University of Minnesota Biocatalysis/ Biodegradation Database": http//www.labmed.umn.edu/ umbbd/).…”

mentioning

confidence: 99%

A Negative Effect of Co-solvent on Atrazine Biodegradation in Experimental River Microcosms.

et al. 2001

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A water-miscible solvent, such as acetone, acetonitrile or methanol, is often employed as a co-solvent to dissolve an organic test chemical of low water solubility in an environmental fate study using a laboratory model microcosm. These co-solvents, however, may disrupt the microflora in the water/sediment tested, and affect the biodegradation of the target compound. In the present study, a 0.1% concentration of acetonitrile as a co-solvent greatly suppressed the microbial degradation of herbicide atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] throughout the experimental period (84 days). The rapid growth of specific microbes was considered to deprive atrazine-degrading microbes of their habitat (mainly the surface area of sediment particles) in the microcosm.

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Degradation of atrazine by Pseudomonas: N-dealkylation and dehalogenation of atrazine and its metabolites

Cited by 216 publications

References 18 publications

Influence of nitrogen on atrazine and 2, 4 dichlorophenoxyacetic acid mineralization in blackwater and redwater forested wetland soils

Influence of nitrogen on atrazine and 2, 4 dichlorophenoxyacetic acid mineralization in blackwater and redwater forested wetland soils

A Critical View of the Photoinitiated Degradation of Herbicides

A Negative Effect of Co-solvent on Atrazine Biodegradation in Experimental River Microcosms.

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