INVESTIGADORES
ROSSI franco Ruben
congresos y reuniones científicas
Título:
POLYAMINES AND POLYAMINOOXIDASES IN PLANT DEFENSE AGAINST PATHOGENIC MICROORGANISMS
Autor/es:
MARÍA MARINA; MARÍA ELISA GONZALEZ; FRANCO RUBÉN ROSSI; FERNANDO MATÍAS ROMERO; SANTIAGO MAIALE; ANDRÉS GÁRRIZ; OSCAR ADOLFO RUIZ; FERNANDO LUIS PIECKENSTAIN
Lugar:
Mendoza
Reunión:
Simposio; Reunion Anual Sociedad Argentina de Investigación en Bioquímica y Biología Molecular; 2012
Resumen:
Polyamines, natural polycationic compounds essential for all living
organisms, are involved in a variety of physiological processes.
Polyamines are positively charged at physiological pH, thus
interacting with negatively charged macromolecules such as
nucleic acids and proteins. Plant polyamine metabolism is affected
by a number of stresses, including pathogen infection. Recently, the
use of model plants such as Nicotiana tabacum and Arabidopsis thaliana, as well as novel inhibitors of polyamine catabolism,
increased our knowledge on the role of PAs in plant defense.
Diamino and polyaminooxidases, which catabolize polyamines
and release hydrogen peroxide, were shown to contribute to
tobacco resistance to pathogenic bacteria, fungi and viruses.
Modifications of plant spermine levels by different experimental
approaches demonstrated that this tetraamine contributes to A. thaliana
resistance to the biotrophic bacterium Pseudomonas viridiflava
and cucumber mosaic virus. Interestingly, in planta
spermine accumulation led to a variety of transcriptional changes
related to plant defense. Further elucidation of PA-mediated
changes in the expression of defense-related genes represents an
interesting challenge for molecular plant pathologists