INFIVE   05416
INSTITUTO DE FISIOLOGIA VEGETAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Control of antioxidant accumulation by plant hormones
Autor/es:
BARTOLI, CARLOS GUILLERMO; SENN, MARÍA EUGENIA; MAZORRA, LUIS MIGUEL; GERGOFF GROZEFF, GUSTAVO
Lugar:
Buenos Aires
Reunión:
Congreso; VIII Meeting of the Society for Free Radical Biology and Medicine Reactive oxygen and nitrogen species in plants.; 2013
Resumen:
Plant
tissues contain a large diversity of antioxidants present in high amounts.
These metabolites are important scavenging reactive oxygen species; however, some
of them are now recognized participating in other physiological processes like
cell expansion, division and differentiation. Consequently, their accumulation
must be accurately controlled during plant growth and development in different
tissues. We focus our experiments in the processes regulating the steady state
of ascorbic acid in leaves. The amount and quality of light constitute the main
ambient elements affecting AA accumulation. Its synthesis directly interacts
with respiration; the last step of AA formation depends on the oxidation of its
precursor feeding electrons in mitochondria electron transport chain. We
present evidences showing the participation of the phytohormones gibberellins,
brassinosteroids, ethylene and abscisic acid in the accumulation and synthesis
of ascorbic acid. We also analyze the regulation exerted by phytohormones in plant
respiration and the consequences for ascorbic acid synthesis under different
light environments.