In young seedlings, first observed in hydathodes and borders of new emerging cotyledons and in leaf primordia (PubMed:31862580). Accumulates in expanding leaves (PubMed:31862580).
Copper amine oxidase that can use putrescine and spermidine as substrates (PubMed:28383668). Involved in putrescine catabolism in peroxisomes in response to salt stress (PubMed:28383668). Regulates arginine-dependent nitric oxide (NO) production, a key signaling molecule regulating a wide range of physiological processes including responses to salt stress, by influencing arginine bioavailability (PubMed:28383668). Modulates primary root growth (PubMed:28383668).