Main Reaction: Putrescine + O2 >> δ1 Pyrroline + H2O2 + NH3

Reference: PubMed ID: 26779231
Authors: Sobieszczuk-Nowicka E, Kubala S, Zmienko A, Małecka A, Legocka J
Title: From Accumulation to Degradation: Reprogramming Polyamine Metabolism Facilitates Dark-Induced Senescence in Barley Leaf Cells.
Published: 2016 Jan 6

Putrescine + O2 --> δ1 Pyrroline + H2O2 + NH3