Polyamines (PAs) are aliphatic polycations present in all living organisms. A growing body of evidence reveals their involvement as regulators in a variety of physiological and pathological events. They are oxidatively deaminated by amine oxidases (AOs), including copper amine oxidases (CuAOs) and flavin adenine dinucleotide (FAD)-dependent polyamine oxidases (PAOs). The biologically active hydrogen peroxide (H2O2) is a shared compound in all the AO-catalyzed reactions and it has been reported to play important roles in PA-mediated developmental and stress induced processes. In particular, the AO-driven H2O2 biosynthesis in the cell wall is well known to be involved in plant wound healing and pathogen attack responses by both triggering peroxidase-mediated wall stiffening events and signaling modulation of defense gene expression. Extensive investigation by a variety of methodological approaches revealed high levels of expression of cell-wall localized AOs in root xylem tissues and vascular parenchyma of different plant species. Here, the recent progresses in understanding the role of cell-wall localized AOs as mediators of root xylem differentiation during development and/or under stress conditions are reviewed. A number of experimental evidences support the involvement of apoplastic H2O2 derived from PA oxidation in xylem tissue maturation under stress-simulated conditions.

Ghuge, S.a., Tisi, A., Carucci, A., Rodrigues Pousada, R.a., Franchi, S., Tavladoraki, P., et al. (2015). Cell wall amine oxidases: new players in root xylem differentiation under stress conditions. PLANTS.

Cell wall amine oxidases: new players in root xylem differentiation under stress conditions

TAVLADORAKI, Paraskevi;ANGELINI, Riccardo;
2015-01-01

Abstract

Polyamines (PAs) are aliphatic polycations present in all living organisms. A growing body of evidence reveals their involvement as regulators in a variety of physiological and pathological events. They are oxidatively deaminated by amine oxidases (AOs), including copper amine oxidases (CuAOs) and flavin adenine dinucleotide (FAD)-dependent polyamine oxidases (PAOs). The biologically active hydrogen peroxide (H2O2) is a shared compound in all the AO-catalyzed reactions and it has been reported to play important roles in PA-mediated developmental and stress induced processes. In particular, the AO-driven H2O2 biosynthesis in the cell wall is well known to be involved in plant wound healing and pathogen attack responses by both triggering peroxidase-mediated wall stiffening events and signaling modulation of defense gene expression. Extensive investigation by a variety of methodological approaches revealed high levels of expression of cell-wall localized AOs in root xylem tissues and vascular parenchyma of different plant species. Here, the recent progresses in understanding the role of cell-wall localized AOs as mediators of root xylem differentiation during development and/or under stress conditions are reviewed. A number of experimental evidences support the involvement of apoplastic H2O2 derived from PA oxidation in xylem tissue maturation under stress-simulated conditions.
Ghuge, S.a., Tisi, A., Carucci, A., Rodrigues Pousada, R.a., Franchi, S., Tavladoraki, P., et al. (2015). Cell wall amine oxidases: new players in root xylem differentiation under stress conditions. PLANTS.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/119701
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