Enumeration of 2,4-D-degrading microorganisms in soils and crop plant rhizospheres using indicator media; high populations associated with sugarcane ( )

Sandmann, E.R.I.C.; Loos, Michael

doi:10.1016/0045-6535(84)90066-3

Cited by 79 publications

(28 citation statements)

References 25 publications

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“…In uncultivated soils, fewer microorganisms and lower metabolic activity are expected in relation to cultivated soils because there is no supply of C and energy via root exudation of plants as observed in LF (Sandmann and Loos, 1984). However, increased C-CO2 production in SF soil can be directly related to the high MBC value (Table 2) or be a result of an imbalance in the microbial community due to non-supply of growth factors, thereby inhibiting certain microbial populations whose dead cells would be used by the active microbial biomass as a C source and energy for their metabolism (Sakamoto and Obo, 1994).…”

Section: Resultsmentioning

confidence: 99%

Microbial activity of soil cultivated with corn in association with weeds under different fertility management systems

Melo¹,

Fialho²,

Faria³

et al. 2014

Chilean J. Agric. Res.

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1Interactions between weeds and soil microorganisms can give them a competitive advantage over crops. This study assessed the biomass and microbial activity of soil cultivated with weeds and corn (Zea mays L.) in monoculture and in competition under different fertility management systems. The experiment considered four soil fertility management systems (calcium and magnesium silicate + fertilization; limestone + fertilization; no correction source + fertilization; no correction source + no fertilization) and 12 crops (five competition arrangements between corn and weeds Urochloa brizantha (Hochst. ex A. Rich.) R.D. Webster, Ipomoea grandifolia (Dammer) O'Donell, Conyza canadensis (L.) Cronquist, Hyptis suaveolens (L.) Poit., and Bidens pilosa L. plus the six species in monoculture and bare soil. After 60 d coexisting in a greenhouse, soil samples were collected to determine microbial biomass, respiration rate, and metabolic quotient. Soils cultivated with B. pilosa and Z. mays+U. brizantha showed higher microbial biomass. Cultivation of B. pilosa and Z. mays+H. suaveolens provided greater energy efficiency to maintain microbial cells. Biomass and microbial activity were altered by plant species, coexistence, and soil fertility management. Calcium and magnesium silicate, as well as limestone similarly influenced biomass and respiration rate of soil cultivated with most species. For some crops, the Si source was better than limestone to promote lower specific activity of the edaphic microbiota. The change in the microbial activity of soil can be a strategy used by the species to minimize the effects of competition.

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Section: Resultsmentioning

confidence: 99%

Microbial activity of soil cultivated with corn in association with weeds under different fertility management systems

Melo¹,

Fialho²,

Faria³

et al. 2014

Chilean J. Agric. Res.

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“…In uncultivated soils, it is very common to find fewer microorganisms and lower metabolic activity compared to cultivated soils because there is no supply of carbon and energy via plant root exudation (Sandmann and Loos 1984). Cultivated soils support higher microbial biomass by means of the root exudates, which influence the growth of bacteria and fungi that colonize the rhizosphere with environmental changes in the surrounding soil serving as a substrate for selective growth of microorganisms (Cardoso and Nogueira 2007).…”

Section: Resultsmentioning

confidence: 99%

Microbial activity of soil with sulfentrazone associated with phytoremediator species and inoculation with a bacterial consortium

et al. 2017

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“…E, principalmente, a presença do diuron , com ou sem outra fonte de N ou C, foi o fator seletivo para a ocorrência do crescimento da linhagem EMBRAPA-CNPMA D12-12. Esta característica pode estar relacionada com o local de isolamento da bactéria (solo rizosférico) e com a aplicação do diuron, segundo Sandmann & Loos (1984), a rizosfera de cana-de-açúcar é rica em exsudatos análogos de moléculas xenobióticas e, a utilização intensiva destas pode promover uma seleção dos microrganismos com mecanismos enzimáticos capazes de biodegradar o composto.…”

Section: Utilização De Fonte De Carbono E Nitrogêniounclassified

Isolamento e caracterização de bactérias degradadoras do herbicida diuron

Roque

Melo

2000

Sci. agric. (Piracicaba, Braz.)

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RESUMO: Solos provenientes de áreas cultivadas com cana-de-açúcar, e histórico de utilização do herbicida diuron, foram utilizados para isolamento e caracterização de linhagens bacterianas com potencial de degradar este herbicida. As linhagens foram isoladas de solos da rizosfera de cana-de-açúcar e de solos das entre linhas. Noventa e oito linhagens foram isoladas, das quais 27 foram selecionadas para avaliação do crescimento em meio mineral sólido suplementado com diuron nas concentrações de 5, 10 e 20 µg mL -1 . Neste experimento, 5 linhagens apresentaram um crescimento exponencial entre 0-48 horas (EMBRAPA-CNPMA D12-12, D12-14 e D16-12) e entre 0-110 horas (EMBRAPA-CNPMA D11-9 e D12-18), similar ao controle. A linhagem EMBRAPA-CNPMA D12-12 identificada como Acinetobacter baumannii, foi selecionada para estudo de cinética de crescimento em meio mineral, com e sem fonte de nitrogênio, com e sem glicose (0,5%) e suplementado com diuron nas concentrações 20, 50 e 100 µg mL -1 , apresentando variação em função da fonte de N, da presença da glicose e da concentração do diuron. Palavras-chave: Acinetobacter baumannii, biodegradação, herbicidas, curva de crescimento ISOLATION AND CHARACTERIZATION OF DIURON-DEGRADING SOIL BACTERIAABSTRACT: Soil samples collected in sugarcane fields with a history of use of the herbicide diuron were employed to isolate and characterize bacterial strains with potential to degrade diuron. Strains were isolated from rhizosphere soil and from soil between plant rows. A total of 98 strains were isolated, of which 27 were selected for further evaluation of pesticide degradation potential at the concentrations of 5, 10 and 20 µg mL -1 in mineral agar media. Acinetobacter baumannii strain D12-12 was chosen to study the kinetics of growth in a mineral medium, with and without N, or with and without glucose (0.5%) and supplemented with diuron at either 20, 50 or 100 µg mL -1 . In the first experiment, five strains presented exponential growth between 0-48 hours (D12-12, D12-14 e D16-12) or between 0-110 hours (D11-9 e D12-18). Growth of the strain D12-12 was found to vary dependly on the concentration of nitrogen, glucose and diuron.

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Enumeration of 2,4-D-degrading microorganisms in soils and crop plant rhizospheres using indicator media; high populations associated with sugarcane ( )

Cited by 79 publications

References 25 publications

Microbial activity of soil cultivated with corn in association with weeds under different fertility management systems

Microbial activity of soil cultivated with corn in association with weeds under different fertility management systems

Microbial activity of soil with sulfentrazone associated with phytoremediator species and inoculation with a bacterial consortium

Isolamento e caracterização de bactérias degradadoras do herbicida diuron

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