The Change in the Entomopathogenic Properties in Streptomycin Resistant Bacillus thuringiensis
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Streptomycin-resistant strains (StrR) of the entomopathogenic bacteria Bacillus thuringiensis ssp. galleriae (Btg) have been obtained. Assessment of growth rate of Btg 69–6 colonies revealed significant difference between the initial strain StrS sensitive to antibiotics and StrR. Decrease in susceptibility of instar IV larvae of Galleria mellonella to Btg 69–6 StrR by a factor of eight compared to Btg 69–6 StrS has also been recorded. In Btg 190 StrR, the insecticidal activity decreased by a factor of five. In StrR, the biochemical properties changed after acquisition of resistance compared to the initial strain.
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