Efecto de la ausencia de las poliamina oxidasas AtPAO1 y AtPAO2 en la producción de EROs en la interacción Arabidopsis thaliana-Pseudomonas syringae.

JASSO ROBLES FI; GONZALEZ ME; PIECKENSTAIN FL; RAMÍREZ-GARCÍA JM; GUERRERO-GONZÁLEZ ML; JIMÉNEZ-BREMONT JF; SORIA-GUERRA RE; RODRÍGUEZ-KESSLER M

Córdoba

Congreso; XXXII Reunión Argentina y XVI Congreso Latinoamericano de Fisiología Vegetal; 2022

Plants are defending themselves continuously from the attack of pathogens; the production of reactive oxygen species (ROS) is one of themain defense mechanisms triggered in response to pathogens. Polyamines are aliphatic amines of low molecular weight that show animportant regulatory activity in plant cells. The higher polyamines spermidine and spermine are catabolized by polyamine oxidases (PAO) withthe concomitant production of hydrogen hydroxide (H2O2). Herein we present the functional characterization of the AtPAO1 and AtPAO2genes, which encode cytoplasmic and peroximosal enzymes, during the interaction with Pseudomonas syringae pv. tomato DC3000. Thesepolyamine oxidases mutant lines showed disturbed contents of ROS (H2O2 and superoxide anion radical). Accumulation of superoxide anionradical in Atpao mutants can be explained in part by changes in AtRBOHD and AtRBOHF transcript levels and AtRBOH activity. In addition,transcriptional regulation of AtPAO2 gene by H2O2 and Pseudomonas is presented. Our data highlight the importance of PAOs in plantdefense and their interrelation with other enzymes involved in ROS production and detoxification