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Titre du document / Document title

Response of antioxidant enzymes to excess copper in tomato (Lycopersicon esculentum, Mill.)

Auteur(s) / Author(s)

MAZHOUDI S. (1) ; CHAOUI A. (1) ; GHORBAL M. H. (2) ; EL FERJANI E. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Bio-Physiologie Cellulaires, Département des Sciences Naturelles, Faculté des Sciences de Bizerte, 7021-Zarzouna, TUNISIE
(2) Nutrition et Métabolisme Azotés, Département des Sciences Biologiques, Faculté des Sciences de Tunis, 1060-Campus, Tunis, TUNISIE

Résumé / Abstract

15-day-old seedlings of tomato (Lycopersicon esculentum, Mill., cv. Ibiza F1) were treated, for 7 days, by addition of 50 μM Cu to the nutrient medium. Under these conditions, a decrease in growth, more pronounced in leaves and in stems than in roots, was observed, as compared to controls. Copper accumulation was markedly higher in roots as compared to shoots. In all plant parts, excess copper induced an increase in the rate of lipid peroxidation. Catalase (CAT) activity was not modified in leaves and in stems, but it was decreased in roots. The activity of ascorbate peroxidase (APX) was unaltered in roots and in stems, while it was diminished in leaves. However, guaiacol peroxidase (GPX) activity was increased only in roots and stems. Enhancement of this activity was more important in stems than in roots. Analysis of the profile of anionic isoenzymes of GPX revealed quantitative and qualitative changes in roots and stems of stressed plants. These results, together, indicate that a toxic concentration of copper (50 μM) induces oxidative stress and differential responses of antioxidant enzymes in plant parts. Activity level of GPX, but not APX nor CAT, increased in response to damage.

Revue / Journal Title

Plant science    ISSN  0168-9452   CODEN PLSCE4 

Source / Source

1997, vol. 127, no2, pp. 129-137 (37 ref.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Shannon, IRLANDE  (1985) (Revue)

Mots-clés anglais / English Keywords

Nutrition

;

Copper

;

Trace element (nutrient)

;

Growth

;

Root

;

Above ground plant part

;

Biological accumulation

;

Lipids

;

Peroxidation

;

Lycopersicon esculentum

;

Enzymatic activity

;

Peroxidases

;

Catalase

;

Antioxidant

;

Oxidative stress

;

Solanaceae

;

Dicotyledones

;

Angiospermae

;

Spermatophyta

;

Oxidoreductases

;

Enzyme

;

Vegetable crop

;

Mots-clés français / French Keywords

Nutrition

;

Cuivre

;

Oligoélément

;

Croissance

;

Racine

;

Partie aérienne végétal

;

Accumulation biologique

;

Lipide

;

Peroxydation

;

Lycopersicon esculentum

;

Activité enzymatique

;

Peroxidases

;

Catalase

;

Antioxydant

;

Stress oxydatif

;

Solanaceae

;

Dicotyledones

;

Angiospermae

;

Spermatophyta

;

Oxidoreductases

;

Enzyme

;

Plante légumière

;

Mots-clés espagnols / Spanish Keywords

Nutrición

;

Cobre

;

Oligoelemento

;

Crecimiento

;

Raíz

;

Parte aérea vegetal

;

Acumulación biológica

;

Lípido

;

Peroxidación

;

Lycopersicon esculentum

;

Actividad enzimática

;

Peroxidases

;

Catalase

;

Antioxidante

;

Stress oxidativo

;

Solanaceae

;

Dicotyledones

;

Angiospermae

;

Spermatophyta

;

Oxidoreductases

;

Enzima

;

Planta leguminosa

;

Localisation / Location

INIST-CNRS, Cote INIST : 15982, 35400006886676.0020

Nº notice refdoc (ud4) : 2780643



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