abstract

• Polyamines (PAs) are small aliphatic amines with important regulatory activities in plants. Biotic stress results in changes in PA levels due to de novo synthesis and PA oxidation. In Arabidopsis thaliana five FAD-dependent polyamine oxidase enzymes (AtPAO1-5) participate in PA back-conversion and degradation. PAO activity generates H2O2, an important molecule involved in cell signaling, elongation, programmed cell death, and defense responses. In this work we analyzed the role of AtPAO genes in the Arabidopsis thaliana-Pseudomonas syringae pathosystem. AtPAO1 and AtPAO2 genes were transcriptionally up-regulated in infected plants. Atpao1-1 and Atpao2-1 single mutant lines displayed altered responses to Pseudomonas, and an increased susceptibility was found in the double mutant Atpao1-1 x Atpao2-1. These polyamine oxidases mutant lines showed disturbed contents of ROS (H2O2 and O2 [rad] −) and altered activities of RBOH, CAT and SOD enzymes both in infected and control plants. In addition, changes in the expression levels of AtRBOHD, AtRBOHF, AtPRX33, and AtPRX34 genes were also noticed. Our data indicate an important role for polyamine oxidases in plant defense and ROS homeostasis. © 2019 Elsevier B.V.

authors

• Gonzalez M.E.
• Guerrero González María de la Luz
• Jasso-Robles F.I.
• Jiménez-Bremont J.F.
• Pieckenstain F.L.
• Ramírez-García J.M.
• Rodríguez Domínguez Kessler Margarita

publication date

• 2020-01-01

funding provided via

• 2011-169509, 2012-190390  Grant
• Agencia Nacional de Promoción Científica y Tecnológica, ANPCyT: PICT2014-3286  Grant
• Consejo Nacional de Ciencia y Tecnología, Paraguay, El CONACYT  Grant
• Consejo Nacional de Ciencia y Tecnología, CONACYT  Grant
• Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET: PIP 11220150100903  Grant

published in

• Plant Science  Journal

keywords

• Arabidopsis thaliana-Pseudomonas syringae pathosystem; Hydrogen peroxide; Polyamine oxidases; RBOH enzymes; Spermine; Superoxide anion radical Arabidopsis protein; oxidoreductase; PAO2 protein, Arabidopsis; reactive oxygen metabolite; reduced nicotinamide adenine dinucleotide phosphate oxidase; respiratory burst oxidase homolog D, Arabidopsis; Arabidopsis; enzymology; gene expression regulation; genetics; metabolism; physiology; Pseudomonas syringae; Arabidopsis; Arabidopsis Proteins; Gene Expression Regulation, Plant; NADPH Oxidases; Oxidoreductases Acting on CH-NH2 Group Donors; Pseudomonas syringae; Reactive Oxygen Species

Digital Object Identifier (DOI)

• 10.1016/j.plantsci.2019.110372

PubMed ID

• 32005378

start page

end page

volume

• 292