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Cadmium-induced changes in antioxidative systems, hydrogen peroxide content, and lipid peroxidation inArabidopsis thaliana

한국식물학회지 2004년 47권 3호 p.262 ~ 262
 ( Cho Un-Haing ) - Changwon National University Department of Biology

 ( Sohn Ji-Young ) - Changwon National University Department of Biology

Abstract


To study the relationship between cadmium (Cd)-induced phytotoxicity and oxidative stress, we grew Cd-sensitive wild-type (WT) and Cd-resistant type (RT) seedlings ofArabidopsis thaliana on MS media containing up to 500 μM CdCl2. The resistant seedlings showed higher biomasses and lower hydrogen peroxide and lipid peroxidation levels, the latter expressed in terms of malondialdehyde (MDA) production. These results indicate that RT plants experience lower oxidative stress when exposed to Cd. Furthermore, compared with the WT, RT seedlings have significantly higher activities of superoxide dismutase (SOD) and enzymes related to hydrogen peroxide removal, e.g., guaiacol peroxidase (GPX), ascorbate peroxidase (APX), and glutathione reductase (GR). These differential responses suggest that such phytotoxicity could be induced by oxidative stress, and that lower accumulations of hydrogen peroxide confer Cd tolerance in seedlings.

키워드

Arabidopsis; cadmium; hydrogen peroxide; oxidative stress
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