INBA   12521
INSTITUTO DE INVESTIGACIONES EN BIOCIENCIAS AGRICOLAS Y AMBIENTALES
Unidad Ejecutora - UE
artículos
Título:
Sugar signaling of fructan metabolism: New insights on protein phosphatases in sucrose-fed wheat leaves
Autor/es:
MARTINEZ NOËL, G; TOGNETTI, J; SALERNO, G L; PONTIS, H G
Revista:
Plant Signaling & Behavior
Editorial:
Landes Bioscience
Referencias:
Lugar: Austin, TX, USA; Año: 2010 vol. 5 p. 551 - 553
ISSN:
1559-2316
Resumen:
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Protein phosphatase
type 2A (PP2A) activity is required for the sucrose induction of fructan
metabolism in wheat leaves, as shown in experiments with the addition of the
specific inhibitor okadaic acid (OA) together with sucrose. However, a decrease
in total PP2A activity has been found along sucrose treatment. Here we analyze
the effect of sucrose feeding to wheat leaves on PP2A activity profiles after
Deae-Sephacel and Superose separation, in comparison with those of control
leaves. The results show no evidence of changes in PP2A activity profiles as a
consequence of sucrose feeding. In all, our data suggest that constitutive
levels of PP2A activity may be sufficient for the sucrose-mediated induction of
fructan metabolism and that general decrease of PP2A activity produced by
long-term treatment with sucrose may be due to a negative feedback regulation.