Selection of microorganisms degrading S-Metolachlor herbicide

Martins, Paulo Sodero; Martínez, Camila Ortiz; Carvalho, Gabriela Ferreira; Carneiro, Paulo Irajara Borba; Azevedo, Ricardo Antunes; Pileggi, Sônia Alvim Veiga; Melo, I. S. de; Pileggi, Marcos

doi:10.1590/s1516-89132007000100019

Cited by 31 publications

(13 citation statements)

References 20 publications

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“…Crop protection chemicals are widely used to maintain the adequate quality and health of plants (Martins et al 2007 ). However, inappropriate use of those products may suppress plant growth and development, thus decreasing crop yields (Andrea et al 2003 ).…”

Section: Discussionmentioning

confidence: 99%

Microbial and enzymatic activity of soil contaminated with a mixture of diflufenican + mesosulfuron-methyl + iodosulfuron-methyl-sodium

Baćmaga

Borowik

Kucharski

et al. 2014

Environ Sci Pollut Res

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The aim of this study was to determine the effect of three active substances, diflufenican, mesosulfuron-methyl and iodosulfuron-methyl-sodium, applied in combination, on soil microbial counts, the structure of soil microbial communities, activity of soil enzymes and their resistance to the tested product, the biochemical indicator of soil fertility, and spring wheat yield. Soil samples with the granulometric composition of sandy loam with pHKCl 7.0 were used in a pot experiment. The herbicide was applied to soil at seven doses: 0.057 (dose recommended by the manufacturer), 1.140, 2.280, 4.560, 9.120, 18.240 and 36.480 mg kg−1 soil DM. Uncontaminated soil served as the control treatment. It was found that a mixture of the tested active substances increased the counts of total oligotrophic bacteria and spore-forming oligotrophic bacteria, organotrophic bacteria and actinomycetes, decreased the counts of Azotobacter and fungi, and modified the structure of soil microbial communities. The highest values of the colony development (CD) index and the ecophysiological (EP) index were observed in fungi and organotrophic bacteria, respectively. The herbicide applied in the recommended dose stimulated the activity of catalase, urease and acid phosphatase, but it had no effect on the activity of dehydrogenases, alkaline phosphatase, arylsulfatase and β-glucosidase. The highest dose of the analyzed substances (36.480 mg kg−1) significantly inhibited the activity of dehydrogenases, acid phosphatase, alkaline phosphatase and arylsulfatase. The values of the biochemical soil fertility indicator (BA21) decreased in response to high doses of the herbicide. Urease was most resistant and dehydrogenases were least resistant to soil contamination with a mixture of diflufenican + mesosulfuron-methyl + iodosulfuron-methyl-sodium. The analyzed herbicide had an adverse influence on spring wheat yield, and doses of 18.240 and 36.480 mg kg−1 led to eventual death of plants.

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Section: Discussionmentioning

confidence: 99%

Microbial and enzymatic activity of soil contaminated with a mixture of diflufenican + mesosulfuron-methyl + iodosulfuron-methyl-sodium

Baćmaga

Borowik

Kucharski

et al. 2014

Environ Sci Pollut Res

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“…From the chloroacetamides class, S-metolachlor is among the top three most world widely used corresponding to 4.2% of the global pesticide use [2,3]. Since herbicides can potentially be toxic to organisms other than their intended target, determining their impact on non-target organisms in the soil has been of considerable interest.…”

mentioning

confidence: 99%

Degradation of S-metolachlor and its Effects on Soil Enzymes and Microbial Communities in Vegetable Field Soil

Huang¹,

Cui²,

Zhou³

et al. 2017

JRST

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S-metolachlor is a promising alternative to metolachlor. However, the extensive use of S-metolachlor as herbicide in vegetable fields in China has caused concerns about its environmental fate. Here we investigated the effects of temperature, relative humidity (RH) and PH on the degradation rate of S-metolachlor in vegetable soil. The degradation rates of S-metolachlor increased with increasing temperatures and RH and either acidic or basic PH facilitates S-metolachlor degradation. The degradation of S-metolachlor under these conditions followed the first-order kinetics resulting in the half-lives (T-1/2) ranging from 12.18 d to 70.71 d at 5-35°C, and 27.28 d to 53.72 d at RH 30-90%; and 29.62-19.69 d at pH 6-8. Stronger response of soil enzymes including catalase, dehydrogenase, urease and cellulase to S-metolachlor was detected in soil with high organic matter. PLFA profiles showed that, totally, the microbe populations including actinomycetes, fungi and bacteria increased gradually in the first 14 days after the treatment and decreased from 14d to 28d after the treatment. All the S-metolachlor treatments caused the increase of aerobe and anaerobe. High S-metolachlor concentration, 13.9 mg/kg, could cause significant variation at the first 2 weeks, stimulating growth of the entire soil microbial community. These findings might have practical implications for the fate of S-metolachlor residue in vegetable fields. Environmental factors, especially temperature, relative humidity and pH should be considered in combination with the appropriate application dose of S-metolachlor for achieving satisfactory weed-control efficacy, reducing runoff, and minimizing effects on environmental quality.

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“…This herbicide has high toxicity and can be leached, representing a powerful source of groundwater pollution (Liu et al 2001). Martins et al (2007) stated that only four microorganisms in soil have the ability to degrade this xenobiotic.…”

Section: Soil Enzymesmentioning

confidence: 99%

The Effect of Diflufenican and Its Mixture with S-metolachlor and Metribuzin on Nitrogenase and Microbial Activity of Soil under Yellow Lupine (Lupinus luteus L.)

Niewiadomska

Skrzypczak

Sobiech

et al. 2018

Tarım Bilimleri Dergisi

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The aim of the study was to evaluate the effect of the active substance of diflufenican and its combination with s-metolachlor or metribuzin, applied to yellow lupine, on the nitrogenase activity, the population size of selected groups of microorganisms, the activity of soil enzymes and their sensitivity to the tested preparations. All analysed preparations caused a reduction in the total number of bacteria and the number of actinobacteria and oligotrophic bacteria at the beginning of the vegetation period of yellow lupine. In the combination where diflufenican was used separately a stimulatory effect on nitrogenase activity was observed. The research revealed very high sensitivity of dehydrogenases and acid phosphatase to the soil contamination caused by application of all the tested herbicides. The dehydrogenases activity values were closely correlated with reduced populations of the groups of microorganisms. Diflufenican applied separately caused a relatively small negative effect on biological soil properties and consequently could have a smaller negative effect on soil environment contamination in comparison to other variants.

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Selection of microorganisms degrading S-Metolachlor herbicide

Abstract: ABSTRACT

Cited by 31 publications

References 20 publications

Microbial and enzymatic activity of soil contaminated with a mixture of diflufenican + mesosulfuron-methyl + iodosulfuron-methyl-sodium

Microbial and enzymatic activity of soil contaminated with a mixture of diflufenican + mesosulfuron-methyl + iodosulfuron-methyl-sodium

Degradation of S-metolachlor and its Effects on Soil Enzymes and Microbial Communities in Vegetable Field Soil

The Effect of Diflufenican and Its Mixture with S-metolachlor and Metribuzin on Nitrogenase and Microbial Activity of Soil under Yellow Lupine (Lupinus luteus L.)

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