RefDoc
Haut

Faire une nouvelle recherche
Make a new search
Lancer la recherche


Titre du document / Document title

Copper toxicity in Ceratophyllum demersum L. (Coontail), a free floating macrophyte : Response of antioxidant enzymes and antioxidants

Auteur(s) / Author(s)

RAMA DEVI S. (1) ; PRASAD M. N. V. (1) ;

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

(1) Department of Plant Sciences, School of Life Sciences, University of Hyderabad, Hyderabad 500046, A.P., INDE

Résumé / Abstract

Copper-induced oxidative stress, response of antioxidative enzymes and substances were investigated in Ceratophyllum demersum L. (Coontail), a free floating macrophyte to understand the mechanisms of Cu resistance. Bioconcentration of Cu in plants treated with 2 and 4 μM Cu for 24 h was dependent on external Cu concentration. Cu uptake decreased the chlorophyll content and increased both lipid peroxidation and leakage of ions which were attributed to Cu-induced oxidative stress. Plants responded to Cu-induced oxidative stress by modulating antioxidative enzymes and antioxidants. Cu (2 and 4 μM) considerably increased the activities of ascorbate peroxidase, catalase and superoxide dismutase. The extent of increase with 4 μM Cu was lower compared to μM Cu for catalase and superoxide dismutase, while for ascorbate peroxidase the activity remained virtually identical. Cu also altered the antioxidants level such as GSH and other non-protein thiols. At 2 μM Cu, both GSH and other non-protein thiols were increased and the extent of increase varied among them. However, 4 μM Cu decreased their levels, possibly due to the greater oxidation in the presence of Cu compared to the rate of synthesis. This decrease could also partly due to limited activity of antioxidant enzymes fostering oxidation. The results suggest that Cu accumulation in C. demersum induces oxidative stress and the level of tolerance depends on the antioxidative capacity of the plants.

Revue / Journal Title

Plant science    ISSN  0168-9452   CODEN PLSCE4 

Source / Source

1998, vol. 138, no2, pp. 157-165 (40 ref.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Shannon, IRLANDE  (1985) (Revue)

Mots-clés anglais / English Keywords

Phytotoxicity

;

Antioxidant

;

Defense mechanism

;

Sensitivity resistance

;

Oxidative stress

;

Biological accumulation

;

Concentration

;

Absorption

;

L-Ascorbate peroxidase

;

Ceratophyllum demersum

;

Glutathione

;

Copper

;

Catalase

;

Superoxide dismutase

;

Peroxidases

;

Oxidoreductases

;

Enzyme

;

Ceratophyllaceae

;

Dicotyledones

;

Angiospermae

;

Spermatophyta

;

Enzymatic activity

;

Aquatic weed

;

Mots-clés français / French Keywords

Phytotoxicité

;

Antioxydant

;

Mécanisme défense

;

Sensibilité résistance

;

Stress oxydatif

;

Accumulation biologique

;

Concentration

;

Absorption

;

L-Ascorbate peroxidase

;

Ceratophyllum demersum

;

Glutathion

;

Cuivre

;

Catalase

;

Superoxide dismutase

;

Peroxidases

;

Oxidoreductases

;

Enzyme

;

Ceratophyllaceae

;

Dicotyledones

;

Angiospermae

;

Spermatophyta

;

Activité enzymatique

;

Mauvaise herbe aquatique

;

Mots-clés espagnols / Spanish Keywords

Fitotoxicidad

;

Antioxidante

;

Mecanismo defensa

;

Sensibilidad resistencia

;

Stress oxidativo

;

Acumulación biológica

;

Concentración

;

Absorción

;

L-Ascorbate peroxidase

;

Ceratophyllum demersum

;

Glutatión

;

Cobre

;

Catalase

;

Superoxide dismutase

;

Peroxidases

;

Oxidoreductases

;

Enzima

;

Ceratophyllaceae

;

Dicotyledones

;

Angiospermae

;

Spermatophyta

;

Actividad enzimática

;

Malezas acuáticas

;

Localisation / Location

INIST-CNRS, Cote INIST : 15982, 35400007317556.0040

Nº notice refdoc (ud4) : 1606443



Faire une nouvelle recherche
Make a new search
Lancer la recherche
Bas