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. 1997 Apr;63(4):1288–1297. doi: 10.1128/aem.63.4.1288-1297.1997

Molecular detection of streptomycin-producing streptomycetes in Brazilian soils.

A S Huddleston 1, N Cresswell 1, M C Neves 1, J E Beringer 1, S Baumberg 1, D I Thomas 1, E M Wellington 1
PMCID: PMC168423  PMID: 9097426

Abstract

Actinomycetes were isolated from soybean rhizosphere soil collected as two field sites in Brazil. All the isolates were identified as Streptomyces species and were screened for streptomycin production and the presence of two genes, strA and strB1, known to be involved in streptomycin biosynthesis in Streptomyces griseus. Antibiotic resistance profiles were determined for 53 isolates from cultivated and uncultivated sites, and approximately half the strains were streptomycin resistance. Clustering by the unweighted pair group method with averages indicated the presence of two major clusters, with the majority of resistant strains from cultivated sites being placed in cluster 1. Only representatives from this cluster contained strA. Streptomycetes containing strA and strB1 were phenotypically diverse, and only half could be assigned to known species. Sequence comparison of 16S rRNA and trpBA (tryptophan synthetase) genes revealed that streptomycin- producing streptomycetes were phylogenetically diverse. It appeared that a population of streptomycetes had colonized the rhizosphere and that a proportion of these were capable of streptomycin production.

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Selected References

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