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Isolation and characterization of alachlor-degrading actinomycetes from soil

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Abstract

Alachlor (2-cloro-N-(methoxymethyl)-N-(2,6-diethylphenyl)-acetamide) is an extremely toxic and highly mobile herbicide that is widely used for pre-emergence control of grasses and weeds in many commercial crops in Brazil. In order to select soil actinomycetes able to degrade this herbicide, fifty-three actinomycete strains were isolated from soil treated with alachlor using selective conditions and subjected to in vitro degradation assays. Sixteen isolates were shown to be tolerant to high concentrations of the herbicide (up to 720 mg L-1), and six of these were able to grow and degrade ≤ 50 alachlor (72 mg L-1) in mineral salts medium. Morphological and phylogenetic analysis enabled the assignment of the alachlor-degrading strains to the genus Streptomyces. Strain LS151 was related to the type strains of Streptomyces capoamus/Streptomyces galbus, whereas strains LS143 and LS153 were related to Streptomyces bikiniensis. The remaining strains, LS166, LS177 and LS182, were similar in morphological features and recovered in a single cluster based on 16S rDNA sequence analysis, but shown to be distinct on the basis of genomic fingerprint data (rep-PCR). Though a definitive taxonomic assignment of alachlor-degrading strains was not possible, these data indicate that ability to degrade this pesticide was detected in different Streptomyces taxa.

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Authors and Affiliations

  1. Divisão de Recursos Microbianos (CPQBA), CP 6171, UNICAMP, CEP 13081-970, Campinas, SP, Brazil

    Lara D. Sette, Valéria M. de Oliveira & Gilson P. Manfio

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  1. Lara D. Sette
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  2. Valéria M. de Oliveira
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  3. Gilson P. Manfio
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Correspondence to Lara D. Sette.

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Sette, L.D., Oliveira, V.M.d. & Manfio, G.P. Isolation and characterization of alachlor-degrading actinomycetes from soil. Antonie Van Leeuwenhoek 87, 81–89 (2005). https://doi.org/10.1007/s10482-004-1129-2

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  • DOI: https://doi.org/10.1007/s10482-004-1129-2

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