Resumen de Polymaine metabolism in response to pseudomonas syringae in arabidopsis thaliana
The topic of this thesis is to investigate the polyamine metabolism during defense response in Arabidopsis thaliana. I mainly focused on the alteration of polyamine metabolism in different layers of plant immunity triggered by Pseudomonas syringae and temperature-conditioned autoimmunity. I report that polyamine metabolism is influenced by bacterial pathogen and results in Putrescine accumulation independently of salicylic acid (SA). In this regard, the polyamines contribution in activated defense response was studied as well. I also studied the new genes modulating polyamine metabolism in non-stress and stress conditions. My focus was mainly was in S-adenosine methionine (SAM) synthase and SAM decarboxylases (SAMDC) and theirrole in polyamine biosynthesis. In this regard, I report the tight regulation of higherpolyamines (Spermidine and Spermine) in response to hemi-biotrophic bacteria.
Moreover, the polyamines-ethylene interrelationship also studied in the context of defense triggered. Overall, we proof the involvement of Putrescine in response to hemi-biotrophic pathogen, as an SA-independent response.
