Artículo
Cadmium induced oxidative stress in soybean plants also by the accumulation of δ-aminolevulinic acid
Noriega, Guillermo Osvaldo
; Balestrasse, Karina Beatriz
; Batlle, Alcira María del C.
; Tomaro, Maria Lujan
Fecha de publicación:
10/01/2007
Editorial:
Springer
Revista:
Biometals
ISSN:
0966-0844
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Cadmium toxicity has been extensively studied in plants, however its biochemical mechanism of action has not yet been well established. To fulfil this objective, four-weeks-old soybean nodulated plants were treated with 200 µM Cd2+ for 48 h. δ-aminolevulinic acid dehydratase (ALA-D, E.C. 4.2.1.24) activity and protein expression, as well as δ-aminolevulinic acid (ALA) and porphobilinogen (PBG) concentrations were determined in nodules, roots and leaves. In vitro experiments carried out in leaves were performed using leaf discs to evaluate the oxidant and antioxidant properties of ALA and S-adenosyl-L-methinone (SAM), respectively. Oxidative stress parameters such as thiobarbituric acid reactive substances (TBARS) and GSH levels as well as superoxide dismutase (SOD, E.C. 1.15.1.1), and guaiacol peroxidase (GPOX, E.C. 1.11.1.7) were also determined. Cadmium treatment caused 100% inhibition of ALA-D activity in roots and leaves, and 72% inhibition in nodules whereas protein expression remained unaltered in the three studied tissues. Plants accumulated ALA in nodules (46%), roots (2.5-fold) and leaves (104%), respect to controls. From in vitro experiments using leaf discs, exposed to ALA or Cd2+, it was found that TBARS levels were enhanced, while GSH content and SOD and GPOX activities and expressions were diminished. The protective role of SAM against oxidative stress generated by Cd2+ and ALA was also demonstrated. Data presented in this paper let us to suggest that accumulation of ALA in nodules, roots and leaves of soybean plants due to treatment with Cd2+ is highly responsible for oxidative stress generation in these tissues.
Palabras clave:
D-AMINOLEVULINIC ACID
,
DAMINOLEVULINIC ACID DEHYDRATASE
,
CADMIUM
Archivos asociados
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Identificadores
Colecciones
Articulos(CIPYP)
Articulos de CENTRO DE INVEST. SOBRE PORFIRINAS Y PORFIRIAS
Articulos de CENTRO DE INVEST. SOBRE PORFIRINAS Y PORFIRIAS
Articulos(INBA)
Articulos de INST.DE INVEST. EN BIOCIENCIAS AGRICOLAS Y AMBIENTALES
Articulos de INST.DE INVEST. EN BIOCIENCIAS AGRICOLAS Y AMBIENTALES
Citación
Noriega, Guillermo Osvaldo; Balestrasse, Karina Beatriz; Batlle, Alcira María del C.; Tomaro, Maria Lujan; Cadmium induced oxidative stress in soybean plants also by the accumulation of δ-aminolevulinic acid; Springer; Biometals; 20; 6; 10-1-2007; 841-851
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