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. 1994 May;60(5):1674–1677. doi: 10.1128/aem.60.5.1674-1677.1994

Tellurium and Selenium Resistance in Rhizobia and Its Potential Use for Direct Isolation of Rhizobium meliloti from Soil †

B K Kinkle 1,‡, M J Sadowsky 2,*, K Johnstone 3, W C Koskinen 1
PMCID: PMC201536  PMID: 16349263

Abstract

Forty-eight Rhizobium and Bradyrhizobium strains were screened for resistance to tellurite, selenite, and selenate. High levels of resistance to the metals were observed only in Rhizobium meliloti and Rhizobium fredii strains; the MICs were 2 to 8 mM for Te(IV), >200 mM for Se(VI), and 50 to 100 mM for Se(IV). Incorporation of Se and Te into growth media permitted us to directly isolate R. meliloti strains from soil. Mutant strains of rhizobia having decreased levels of Se and Te resistance were constructed by Tn5 mutagenesis and were found to have transposon insertions in DNA fragments of different sizes. Genomic DNAs from Ter rhizobium strains failed to hybridize with Ter determinants from plasmids RP4, pHH1508a, and pMER610.

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Selected References

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