INVESTIGADORES
MARINA maria
congresos y reuniones científicas
Título:
Polyamine metabolism in tobacco plants infected by Sclerotinia sclerotiorum
Autor/es:
MARINA, M,; RIVAS, E I; GÁRRIZ, A; DALMASSO, M C; PIECKENSTAIN, FL; RUIZ, OA
Lugar:
Bariloche, Río Negro, Argentina
Reunión:
Congreso; XXXIX Reunión Anual de la Sociedad Argentina de Investigación en Bioquímica y Biología Molecular; 2003
Institución organizadora:
SAIB
Resumen:
  Polyamines (putrescine, spermidine and spermine) are small polycationic compounds that occur in all living organisms. Plants and some bacteria synthesize putrescine (Put) by two alternative pathways involving ornithine decarboxylase (ODC) and arginine decarboxylase (ADC), while in animals and many fungi, ODC is the sole pathway for PUT production. Spermidine (Spd) is synthesized from PUT by the addition of an aminopropyl group donated by decarboxylated S-adenosyl-methionine (AdoMet). The enzymes involved are spermidine synthase and AdoMet decarboxylase. In a similar way, spermine synthase catalyses the addition of an aminopropyl group to SPD, thus forming spermine (Spm). In plants, it has been shown that they are essential for growth and developmental processes, and recently, they have been related to plant defense responses. Regarding this, high levels of spermine were observed in Tobacco plants after TMV infection and moreover, spermine itself was able to induce the expression of pathogenesis-related proteins in a salicylic-independent way. This work was aimed to evaluate polyamine levels of Tobacco plants in response to Sclerotinia sclerotiorum infection, a nechrotrophic fungus being the most important pathogen of cultivated sunflower in Argentina.