Spatial variation in the degradation rate of the pesticides isoproturon, azoxystrobin and diflufenican in soil and its relationship with chemical and microbial properties

Bending, Gary D.; Lincoln, Suzanne D.; Edmondson, R. N.

doi:10.1016/j.envpol.2005.05.011

Cited by 148 publications

(77 citation statements)

References 19 publications

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“…TES and the enriched bacterial culture possess a degrading ability specific for IPU. pH is one of the most important factors which has been reported to have significant effects on microbial pesticide degradation not only in soils (El-Sebai et al 2005Bending et al 2006) but also in isolated bacterial culture studies Hussain et al 2009;Sun et al 2009). This study also highlights the effect of pH on the IPU degradation kinetics by the strain SH.…”

Section: Discussionmentioning

confidence: 99%

Isolation and characterization of an isoproturon mineralizing Sphingomonas sp. strain SH from a French agricultural soil

et al. 2010

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The phenylurea herbicide isoproturon, 3-(4-isopropylphenyl)-1,1-dimethylurea (IPU), was found to be rapidly mineralized in an agricultural soil in France that had been periodically exposed to IPU. Enrichment cultures from samples of this soil isolated a bacterial strain able to mineralize IPU. 16S rRNA sequence analysis showed that this strain belonged to the phylogeny of the genus Sphingomonas (96% similarity with Sphingomonas sp. JEM-14, AB219361) and was designated Sphingomonas sp. strain SH. From this strain, a partial sequence of a 1,2-dioxygenase (catA) gene coding for an enzyme degrading catechol putatively formed during IPU mineralization was amplified. Phylogenetic analysis revealed that the catA sequence was related to Sphingomonas spp. and showed a lack of congruence between the catA and 16S rRNA based phylogenies, implying horizontal gene transfer of the catA gene cluster between soil microbiota. The IPU degrading ability of strain SH was strongly influenced by pH with maximum degradation taking place at pH 7.5. SH was only able to mineralize IPU and its known metabolites including 4-isopropylaniline and it could not degrade other structurally related phenylurea herbicides such as diuron, linuron, monolinuron and chlorotoluron or their aniline derivatives. These observations suggest that the catabolic abilities of the strain SH are highly specific to the metabolism of IPU.

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Section: Discussionmentioning

confidence: 99%

Isolation and characterization of an isoproturon mineralizing Sphingomonas sp. strain SH from a French agricultural soil

et al. 2010

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“…So there is a serious need to develop remediation processes to eliminate or minimize the contamination of isoproturon in surface water and groundwater as well. Recently, much more attention has been paid to the fate of isoproturon in environmental conditions (Bending et al 2006;Bending and Rodriguez-Cruz 2007;Celis et al 2008;Walker et al 2001Walker et al , 2008, Biodegradation may be used as a reliable and cost-effective technique for pesticide abatement. A lot of strains (Kristensen et al 2006;Radosevich et al 1995;Topp et al 2000) are known for their interesting catabolic capabilities to degrade a wide variety of environmentally hazardous compounds.…”

Section: Introductionmentioning

confidence: 99%

Isolation and characterization of three Sphingobium sp. strains capable of degrading isoproturon and cloning of the catechol 1,2-dioxygenase gene from these strains

Sun

Huang

Chen

et al. 2008

World J Microbiol Biotechnol

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Three strains of bacteria (designated as YBL1, YBL2, YBL3 respectively) capable of degrading isoproturon, 3-(4-isopropylphenyl)-1, 1-dimethylurea, were isolated from the soils of two herbicide plants. Based on the comparative analysis of the 16S rRNA gene, and phenotypic and biochemical characterization, these strains were identified as Sphingobium sp. The optimum conditions for isoproturon degradation by these strains were pH 7.0, and temperature 30°C. Mg 2? (1 mM) enhanced the isoproturon degradation rate, while Ni 2? and Cu 2? (1 mmol l -1 ) inhibited isoproturon degradation significantly. These three strains also showed the ability to remove the residues of other phenylurea herbicides such as chlorotoluron, diuron and fluometuron in mineral salt culture medium. The N-demethylation was the first step of degradation of dimethylurea-substituted herbicides. Strain YBL1 was found capable of degrading both dimethylureasubstituted herbicides and methoxymethylphenyl-urea herbicides i.e. linuron (3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea). Using the PCR method, partial sequences of the catechol 1,2-dioxygenase gene were obtained from these strains.

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“…In the pre-sieved soil, total organic matter, microbial biomass-N, dehydrogenase activity, pH, clay, sand and silt content were measured, as described in Bending et al (2006).…”

Section: Analysis Of Soil Characteristicsmentioning

confidence: 99%

Study of the spatial variation of the biodegradation rate of the herbicide bentazone with soil depth using contrasting incubation methods

2008

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Spatial variation in the degradation rate of the pesticides isoproturon, azoxystrobin and diflufenican in soil and its relationship with chemical and microbial properties

Cited by 148 publications

References 19 publications

Isolation and characterization of an isoproturon mineralizing Sphingomonas sp. strain SH from a French agricultural soil

Isolation and characterization of an isoproturon mineralizing Sphingomonas sp. strain SH from a French agricultural soil

Isolation and characterization of three Sphingobium sp. strains capable of degrading isoproturon and cloning of the catechol 1,2-dioxygenase gene from these strains

Study of the spatial variation of the biodegradation rate of the herbicide bentazone with soil depth using contrasting incubation methods

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