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Open Access Isolamento e caracterização de bactérias degradadoras do herbicida diuron Isolation and characterization of diuron-degrading soil bacteria

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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 mig 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 mig mL-1, apresentando variação em função da fonte de N, da presença da glicose e da concentração do diuron.&60;br&62;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 mug 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 mug 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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Document Type: Research Article

Publication date: January 1, 2000

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