The plant enzyme also catalyses the reactions of EC
2.1.3.6 putrescine carbamoyltransferase, EC
2.7.2.2 carbamate kinase and EC
3.5.3.12 agmatine deiminase, thus acting as putrescine synthase, converting agmatine [(4-aminobutyl)guanidine] and ornithine into putrescine and citrulline, respectively.