Ethylene signaling triggered by low concentrations of ascorbic acidregulatesbiomass accumulationinArabidopsis thaliana

CAVIGLIA, MARCOS; MAZORRA MORALES, LUIS M; CONCELLÓN, ANALÍA; GERGOFF GROZEFF, GUSTAVO; WILSON, MICHAEL; FOYER, CHRISTINE H; BARTOLI, CARLOS G.

FREE RADICAL BIOLOGY AND MEDICINE

ELSEVIER SCIENCE INC

Lugar: Amsterdam; Año: 2018

0891-5849

Ascorbic acid (AA) is a major redox buffer in plantcells. The role of ethylene in the redox signaling pathways that influencephotosynthesis 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 biosynthesisgene GDP-L-galactose phosphorylase,produce higheramounts of ethylene than wt plants. In contrast to the wt, the inhibition ofethylene signaling increased leaf conductance, photosynthesis and dry weight inbothvtc2 mutant lines. The AA-deficientmutants showed altered expression of genes encoding proteins involved in thesynthesis/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 inplants, redox-ethylene interactions providing a regulatory node controlling shootbiomass accumulation.