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Cadmium and copper induction of oxidative stress and antioxidative response in tomato (Solanum lycopersicon) leaves

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Abstract

We compare cadmium and copper induced oxidative stress in tomato leaves and the antioxidative enzyme response during a time course of 96 h. Plants were subjected to 25 μM of CdCl2 or CuSO4 and malondialdehyde (MDA) level and activity of guaiacol peroxidase, superoxide dismutase, catalase, ascorbate peroxidase and glutathione reductase were determined. The results showed that there was an early increase in the MDA level and in the guaiacol peroxidase activity more pronounced with copper exposure during almost all the time course of the experiment. The activity of superoxide dismutase and catalase was induced very early after cadmium and copper treatment, reached a maximal value after 12 h and then declined but it remained always slightly higher than the control at the end of the experiment. Ascorbate peroxidase activity pathway was similar to superoxide dismutase or catalase with a maximal activity after 48 h of heavy metal exposure. Induction of glutathione reductase activity observed only under copper exposure is maintained during almost all the experimental time. The antioxidative activity developed by tomato leaves is more induced by copper treatment. This can be related to the ability of this metal to induce more than cadmium an accumulation of reactive oxygen species (ROS) at the cellular level. Decline in the antioxidative enzymes activity at the end of the experiment can be a consequence of cadmium- and copper-inducing a further ROS formation that might affect enzymes activity.

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Abbreviations

APX:

Ascorbate peroxidase

ASC:

Ascorbate

BSA:

Bovine serum albumin

CAT:

Catalase

EDTA:

Ethylenediaminetetraacetic acid

GPOD:

Guaiacol peroxidase

GR:

Glutathione reductase

GSH:

Reduced glutathione

h:

Hour

H2O2 :

Hydrogen peroxide

MDA:

Malondialdehyde

NBT:

Nitro blue tetrazolium

PVP:

Polyvinylpyrrolidone

ROS:

Reactive oxygen species

SOD:

Superoxide dismutase

TBA:

Thiobarbituric acid

TBARS:

Thiobarbituric acid-reacting substances

TCA:

Trichloroacetic acid

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Correspondence to Mediouni Chamseddine.

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Chamseddine, M., Wided, B.A., Guy, H. et al. Cadmium and copper induction of oxidative stress and antioxidative response in tomato (Solanum lycopersicon) leaves. Plant Growth Regul 57, 89–99 (2009). https://doi.org/10.1007/s10725-008-9324-1

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  • DOI: https://doi.org/10.1007/s10725-008-9324-1

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