Abstract
Bacteria and fungi from pristine soil, never exposed to glufosinate herbicide, were isolated and analyzed for glufosinate tolerance. Seven of the 15 tested isolates were sensitive to 1 mM glufosinate (an active ingredient of many nonselective contact herbicides), 5 were resistant to 4 mM glufosinate and 3 even to 8 mM glufosinate in liquid medium. None of the isolated microorganisms carried the gene for glufosinate resistance bar (bialaphos resistance) in its genome and at least in some of glufosinate-resistant isolates the increased glutamine synthetase level was detected as a possible resistance mechanism. The transfer of the bar glufosinate resistance gene from transgenic maize Bt 176 into glufosinate-sensitive soil bacterium Bacillus pumilus S1 was not detected under the laboratory conditions by a classical plate count method and PCR. The ecological risk of potential bar gene transfer from genetically modified plants into soil microcosms under natural circumstances is discussed.
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