Inactivates phosphinothricin (PPT) by transfer of an acetyl group from acetyl CoA. This enzyme is an effector of phosphinothricin tripeptide (PTT or bialaphos) resistance. acetyl-CoA + phosphinothricin = CoA + H(+) + N-acetylphosphinothricin Introduced by genetic manipulation and expressed in glufosinate-tolerant canola and maize by Agrevo. Belongs to the acetyltransferase family. PAT/BAR subfamily.