INVESTIGADORES
GARRIZ andres
congresos y reuniones científicas
Título:
Polyamine concentrations are dynamically regulated during plant-Pseudomonas syringae interactions
Autor/es:
FR ROSSI; VILAS JM; FERNANDO M. ROMERO; OA RUIZ; ANDRÉS GÁRRIZ
Lugar:
CABA
Reunión:
Congreso; Reunión Conjunta de Sociedades de Biociencias; 2017
Institución organizadora:
SAIC, SAIB, SAI, SAA, SAB
Resumen:
Due to their abilities to bind polyanions such as nucleic acids andproteins, the polyamines putrescine, spermidine and spermine areinvolved in several cellular responses. For instance, these aminesparticipate in the activation of plant defense responses and are required for virulence of plant pathogens. Thus, the modulation of theirmetabolism plays essential roles in plant-pathogen interactions. Inthis work, we challenged plants with different pathovars of the bacteriaPseudomonas syringae to evaluate the changes in the concentrationsof polyamines occurring in contrasting pathogenic interactions.Our analysis demonstrated that polyamines are increased intomato in response to a virulent strain, which was associated to theinduction of several polyamine metabolic genes from plant and bacteria.These results suggest that the metabolism of both organismsmodulates polyamine contents in infected tissues. Interestingly, therise in the concentration of putrescine was particularly higher in apoplasticfluids. A further exploration of the polyamine profiles usingArabidopsis plants demonstrated that non-pathogenic strains inducingthe hypersensitive response provoked a remarkable incrementin their concentrations, which was not observed by using an avirulentnon-host bacteria. Thus, specific regulatory mechanisms maymodulate polyamine metabolism in different biological interactions.