INVESTIGADORES
CONCELLON Analia
artículos
Título:
Ethylene signaling triggered by low concentrations of ascorbic acid regulates biomass accumulation in Arabidopsis thaliana
Autor/es:
CAVIGLIA, M; MAZORRA MORALES, LM; CONCELLÓN, ANALIA; GERGOFF GROZEFF, GE; WILSON, M; FOYER, CH; BARTOLI, C
Revista:
FREE RADICAL BIOLOGY AND MEDICINE
Editorial:
ELSEVIER SCIENCE INC
Referencias:
Lugar: Amsterdam; Año: 2018 vol. 122 p. 130 - 136
ISSN:
0891-5849
Resumen:
Ascorbic acid (AA) is a major redox buffer in plant cells. The role of ethylene in the redox signaling pathwaysthat influence photosynthesis and growth was explored in two independent AA deficient Arabidopsis thaliana mutants (vtc2-1 and vtc2-4). Both mutants, which are defective in the AA biosynthesis gene GDP-L-galactose phosphorylase, produce higher amounts of ethylene than wt plants. In contrast to the wt, the inhibition of ethylene signaling increased leaf conductance, photosynthesis and dry weight in both vtc2 mutant lines. The AAdeficient mutants showed altered expression of genes encoding proteins involved in the synthesis/responses to phytohormones that control growth, particularly auxin, cytokinins, abscisic acid, brassinosterioids, ethylene and salicylic acid. These results demonstrate that AA deficiency modifies hormone signaling in plants, redox-ethylene interactions providing a regulatory node controlling shoot biomass accumulation.
