Genetically engineered plant cells and plants exhibiting resistance to glutamine synthetase inhibitors, DNA fragments and recombinants for use in the production of said cells and plants

An isolated DNA encoding a protein having phosphinothricin acetyltransferase activity, or a variant thereof retaining said activity, said protein comprising the amino acid sequence (SEQ ID No. 1):

• X Ser Pro Glu Arg Arg Pro Ala Asp Ile Arg Arg Ala Thr Glu Ala Asp MET Pro Ala Val Cys Thr Ile Val Asn His Tyr Ile Gln Thr Ser Thr Val Asn Phe Arg Thr Glu Pro Gln Glu Pro Gln Glu Trp Thr Asp Asp Leu Val Arg Leu Arg Gln Arg Tyr Pro Trp Leu Val Ala Glu Val Asp Gly Glu Val Ala Gly Ile Ala Tyr Ala Gly Pro Trp Lys Ala Arg Asn Ala Tyr Asp Trp Thr Ala Glu Ser Thr Val Tyr Val Ser Pro Arg His Gln Arg Thr Gly Leu Gly Ser Thr Leu Tyr Thr His Leu Leu Lys Ser Leu Glu Ala Gln Gly Phe Lys Ser Val Val Ala Val Ile Gly Leu Pro Asn Asp Pro Ser Val Arg Met His Glu Ala Leu Gly Tyr Ala Pro Arg Gly Met Leu Arg Ala Ala Gly Phe Lys His Gly Asn Trp His Asp Val Gly Phe Trp Gln Leu Asp Phe Ser Leu Pro Val Pro Pro Arg Pro Val Leu Pro Val Thr Glu Ile
• in which X is Met or Val, said DNA consisting of between 549 and 625 nucleotides.