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Artículo

Metabolic rearrangements in imbibed maize (Zea mays L) embryos in the presence of oxidative stressors

Pena, Liliana BeatrizIcon ; Matayoshi, Carolina LucilaIcon ; Mendez, Andrea Analia ElenaIcon ; Aran, MartinIcon ; Moratto, Camila Julieta; Vázquez Ramos, Jorge M.; Gallego, Susana MabelIcon
Fecha de publicación: 10/2020
Editorial: Elsevier France-Editions Scientifiques Medicales Elsevier
Revista: Plant Physiology and Biochemistry
ISSN: 0981-9428
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias Agrícolas

Resumen

Cadmium (Cd) is a metal known to generate oxidative stress in plants and may be particularly harmful during germination. Herein, the growth and metabolic rearrangements of maize embryo axes subjected during the imbibition stage to Cd ions and other two well-known oxidative stressors, methyl viologen (MV) and hydrogen peroxide (H2O2), were assessed for 48 h. Similar decreases in embryo's length were detected for all stressed axes up to 48 h of imbibition. By this time, treated embryos revealed greater accumulation of reactive oxygen species (ROS) and increased levels of carbonylated and ubiquitinated proteins. The proteolytic activities were intensely enhanced in the treated axes, particularly at 48 h of imbibition, and several antioxidant enzymes were induced in most cases. NMR spectroscopy followed by principal component analysis (PCA) and hierarchical cluster analysis (HCA) showed that a large proportion of polar metabolites, mainly amino acids and organic acids, were decreased under stress conditions, while carbohydrates were increased at 48 h of imbibition, with significant increases in glucose and raffinose for treated embryos relatively to controls. We demonstrated that maize embryo axes were capable of shifting their metabolism to improve their antioxidant defense system, at the expense of their growth. Under these adverse conditions, proteolysis seems to play a key role by providing free amino acids needed for the de novo synthesis of defense-related proteins.
Palabras clave: CADMIUM , METABOLITES , NUCLEAR MAGNETIC RESONANCE , OXIDATIVE STRESS , REDOX BALANCE , ZEA MAYS
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/184036
DOI: http://doi.org/10.1016/j.plaphy.2020.08.029
Colecciones
Articulos(IBR)
Articulos de INST.DE BIOLOGIA MOLECULAR Y CELULAR DE ROSARIO
Articulos(IQUIFIB)
Articulos de INST.DE QUIMICA Y FISICO-QUIMICA BIOLOGICAS "PROF. ALEJANDRO C. PALADINI"
Citación
Pena, Liliana Beatriz; Matayoshi, Carolina Lucila; Mendez, Andrea Analia Elena; Aran, Martin; Moratto, Camila Julieta; et al.; Metabolic rearrangements in imbibed maize (Zea mays L) embryos in the presence of oxidative stressors; Elsevier France-Editions Scientifiques Medicales Elsevier; Plant Physiology and Biochemistry; 155; 10-2020; 560-569
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