Degradation of metalaxyl-M in contrasting soils is influenced more by differences in physicochemical characteristics than in microbial community composition after re-inoculation of sterilised soils

Baker, Kate; Marshall, Samantha J.; Nicol, Graeme W.; Campbell, Colin D.; Nicollier, Gilles; Ricketts, Dean; Killham, K.; Prosser, James I.

doi:10.1016/j.soilbio.2010.03.016

Cited by 20 publications

(13 citation statements)

References 39 publications

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“…The results were in accordance with the previous reports by Hirano et al (Hirano et al 2007); the greater total carbon (TC) contributes to larger organic chemical biodegradation rate because the higher TC content can enhance microorganisms' growth. Soil pH is one of the most important factors which contribute to the degradation process (Baker et al 2010). Microorganisms in soils can be inhibited at pH values below 6 or above 9.…”

Section: Resultsmentioning

confidence: 99%

Impact of the novel neonicotinoid insecticide Paichongding on bacterial communities in yellow loam and Huangshi soils

Cai

Wang

et al. 2015

Environ Sci Pollut Res

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Insecticides are widely sprayed in modern agriculture for ensuring the crop yield, which could also lead to contamination and insecticide residue in soils. Paichongding (IPP) is a novel neonicotinoid insecticide and was developed recently in China. Soil bacterial community, diversity, and community composition vary widely depending on environmental factors. As for now, little is known about bacterial species thriving, bacterial community diversity, and structure in IPP-spraying soils. In present study, IPP degradation in yellow loam and Huangshi soils was investigated, and bacterial communities and diversity were examined in soil without IPP spray and with IPP spray through pyrosequencing of 16S ribosomal RNA (rRNA) gene amplicons. The degradation ratio of IPP at 60 days after treatment (DAT) reached 51.22 and 34.01 % in yellow loam and Huangshi soil, respectively. A higher richness of operational taxonomic units (OTUs) was found in yellow loam soil (867 OTUs) and Huangshi soil (762 OTUs) without IPP spray while OUTs were relatively low in IPP-spraying soils. The community composition also differed both in phyla and genus level between these two environmental conditions. Proteobacteria, Firmicutes, Planctomycetes, Chloroflexi, Armatimonadetes, and Chlorobi were stimulated to increase after IPP application, while IPP inhibited the phyla of Bacteroidetes, Actinobacteria, and Acidobacteria.

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Section: Resultsmentioning

confidence: 99%

Impact of the novel neonicotinoid insecticide Paichongding on bacterial communities in yellow loam and Huangshi soils

Cai

Wang

et al. 2015

Environ Sci Pollut Res

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“…It has been reported that greater total carbon (TC) contributes to a larger organic chemical biodegradation rate because the increased carbon content can enhance microorganisms, which are responsible for degrading organic pollutants (Hirano et al , 2007). In addition, the soil pH influences pollutant and nutrient availability and is one of the important factors that contribute to the degradation rates (Baker et al , 2010). Thus enhanced degradation was maintained at neutral or higher pH in our soils.…”

Section: Resultsmentioning

confidence: 99%

“…Previous reports have shown that greater sorption of chemical pollutants is related to both soil organic matter and large clay content, and greater half-lives and sorption constants are found with small metalaxyl concentrations (Monkiedje et al, 2002;Fernandes et al, 2003). Clay content can affect degradation rate through effects on moisture retention characteristics and the extent of air-filled pore spaces, influencing gaseous exchange and potentially changing microbial community composition (Baker et al, 2010). These results illustrate that the soils with rich OM, neutral pH and appropriate percentage of clay have a large ZJ0273 degradation rate, because these provide suitable conditions for ZJ0273-degrading bacterial growth and biodegradation.…”

Section: Relationship Between Soil Properties and Herbicide Degradationmentioning

confidence: 99%

Aerobic biodegradation kinetics and pathway of the novel herbicide ZJ0273 in soils

Cai

Wang

Shi

et al. 2013

European J Soil Science

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Degradation of ZJ0273, a recently developed pyrimidynyloxybenzoic-based herbicide, was investigated in five different soils under aerobic conditions. ZJ0273 degradation rate was strongly affected by soil physico-chemical characteristics and the inoculation of ZJ0273-degrading bacteria. Greater organic matter (OM) content, neutral pH and inoculation of ZJ0273-degrading bacteria can increase degradation rate and decrease the half-life value (DT50). At 30 • C the biodegradation rate of ZJ0273 reached 41-85% in natural (unsterilized) soils. It ranged from 69 to 96% at 90 days after treatment (DAT) in five different types of soils after re-inoculation of Amycolatopsis sp. M3-1 and DT50 decreased by 34 , 81, 16, 20 and 32 days, respectively, in soils S1, S2, S3, S4 and S5. Furthermore, using the six metabolites (M1-M6) identified six metabolites (M1-M6) by liquid chromatography-mass spectrometry (LC-MS) and their behaviour, a biodegradation pathway of ZJ0273 in soils was proposed. New metabolites, M5 and M6, were found in soils. Biodegradation of ZJ0273 involved continuous biocatalytic reactions, such as de-estering, hydrolysis, acylation, C-N cleavage, de-methyl and ether cleavage reactions. Finally, ZJ0273 was bio-transformed into M4 and M6, which could be degraded and oxidized into CO 2 and H 2 O through the tricarboxylic acid (TCA) cycle.

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“…5,6 Thus, application of commercially available racemic mixtures poses an evitable biological burden for treated plants and soils. Degradation rates per se as well as correlating concentrations of the main metabolite, metalaxyl acid, 12,13 are lower in Cameroonian soil. [7][8][9] The enantioselective degradation of racmetalaxyl in different soils has been studied before.…”

Section: Introductionmentioning

confidence: 89%

“…7,10,11 In exemplary soils from Scheyern (Germany) and Yaoundé (Cameroon), different preferences in enantioselective metalaxyl dissipation have been documented. Degradation rates per se as well as correlating concentrations of the main metabolite, metalaxyl acid, 12,13 are lower in Cameroonian soil. Furthermore, in Cameroonian soil the less active (+)-Senantiomer is preferably degraded, whereas in German soil the active compound, (-)-R-metalaxyl, is degraded faster.…”

Section: Introductionmentioning

confidence: 89%

Enantioselective Degradation of the Chiral Fungicides Metalaxyl and Furalaxyl by Brevibacillus brevis

et al. 2013

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For almost four decades, the chiral fungicides metalaxyl and furalaxyl have been in use in plant protection on a global scale. Both substances are distributed as racemic mixtures, yet the desirable interference in nucleic acid synthesis of harmful fungi only occurs by the (-)-R-enantiomer. As enantioselective degradation in Scheyern (Germany) and Yaoundé (Cameroon) soils has been documented, the influence of 50 isolated microorganisms on the R/S ratio was investigated. A high-pressure liquid chromatography method with a chiral column to separate enantiomers of metalaxyl and furalaxyl, and subsequent detection by tandem mass spectrometry, was employed. Only one of these microorganisms, a strain of Brevibacillus brevis, showed an enantioselective degradation pattern in liquid culture; the respective (-)-R-enantiomers were preferably degraded. Moreover, (-)-R-furalaxyl was degraded faster in cultures supplemented simultaneously with both fungicides of the same concentration.

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Degradation of metalaxyl-M in contrasting soils is influenced more by differences in physicochemical characteristics than in microbial community composition after re-inoculation of sterilised soils

Cited by 20 publications

References 39 publications

Impact of the novel neonicotinoid insecticide Paichongding on bacterial communities in yellow loam and Huangshi soils

Impact of the novel neonicotinoid insecticide Paichongding on bacterial communities in yellow loam and Huangshi soils

Aerobic biodegradation kinetics and pathway of the novel herbicide ZJ0273 in soils

Enantioselective Degradation of the Chiral Fungicides Metalaxyl and Furalaxyl by Brevibacillus brevis

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