Response of transgenic poplar overexpressing cytosolic glutamine synthetase to phosphinothricin

Glutamine synthetase (GS) is a key enzyme in nitrogen metabolism, and the target of the herbicide phosphinothricin (PPT). Overexpression of cytosolic GS enhances the tolerance of poplar to PPT. Increases in GS, large subunit of Rubisco (LSU), and NADP+-isocitrate dehydrogenase (IDH) levels could be considered as mechanisms operating in young poplar leaves to overcome the toxic effect of PPT.