Journal
FREE RADICAL BIOLOGY AND MEDICINE
Volume 122, Issue -, Pages 130-136Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.freeradbiomed.2018.01.032
Keywords
Ascorbic acid; Ethylene, leaf conductance; Photosynthesis; Plants
Funding
- Agencia Nacional de Promocion Cientifica y Tecnologica [PICT 2012-0809]
- Consejo Nacional de Investigaciones Cientificas y Tecnicas [PIP 2012 - 0483]
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Ascorbic acid (AA) is a major redox buffer in plant cells. The role of ethylene in the redox signaling pathways that 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 AA-deficient 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.
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