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The Copper Amine Oxidase AtCuAOδ Participates in Abscisic Acid-Induced Stomatal Closure in Arabidopsis

Department of Science, Università Roma Tre, 00146 Roma, Italy
Institute of Plant Sciences, The Volcani Center, ARO, Bet Dagan 50250, Israel
Istituto Nazionale Biostrutture e Biosistemi (INBB), 00136 Rome, Italy
Department of Life, Health, and Environmental Sciences, Università dell’Aquila, 67100 L’Aquila, Italy
Author to whom correspondence should be addressed.
Plants 2019, 8(6), 183;
Received: 10 May 2019 / Revised: 14 June 2019 / Accepted: 17 June 2019 / Published: 20 June 2019
(This article belongs to the Special Issue Plant Polyamines)
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Plant copper amine oxidases (CuAOs) are involved in wound healing, defense against pathogens, methyl-jasmonate-induced protoxylem differentiation, and abscisic acid (ABA)-induced stomatal closure. In the present study, we investigated the role of the Arabidopsis thaliana CuAOδ (AtCuAOδ; At4g12290) in the ABA-mediated stomatal closure by genetic and pharmacological approaches. Obtained data show that AtCuAOδ is up-regulated by ABA and that two Atcuaoδ T-DNA insertional mutants are less responsive to this hormone, showing reduced ABA-mediated stomatal closure and H2O2 accumulation in guard cells as compared to the wild-type (WT) plants. Furthermore, CuAO inhibitors, as well as the hydrogen peroxide (H2O2) scavenger N,N1-dimethylthiourea, reversed most of the ABA-induced stomatal closure in WT plants. Consistently, AtCuAOδ over-expressing transgenic plants display a constitutively increased stomatal closure and increased H2O2 production compared to WT plants. Our data suggest that AtCuAOδ is involved in the H2O2 production related to ABA-induced stomatal closure. View Full-Text
Keywords: copper amine oxidases; H2O2; ROS; polyamines; ABA; stomatal closure copper amine oxidases; H2O2; ROS; polyamines; ABA; stomatal closure

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Fraudentali, I.; Ghuge, S.A.; Carucci, A.; Tavladoraki, P.; Angelini, R.; Cona, A.; Rodrigues-Pousada, R.A. The Copper Amine Oxidase AtCuAOδ Participates in Abscisic Acid-Induced Stomatal Closure in Arabidopsis. Plants 2019, 8, 183.

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