biologia plantarum

Biologia plantarum 43:141-144, 2000 | DOI: 10.1023/A:1026579702967

Involvement of Lipid Peroxidation in Water Stress-Promoted Senescence of Detached Rice Leaves

J.-N. Lin¹, C. H. Kao¹

¹ Department of Agronomy, National Taiwan University, Taipei, Taiwan, Republic of China

Role of lipid peroxidation and antioxidative enzymes (catalase, peroxidase, superoxide dismutase, ascorbate peroxidase and glutathione reductase) in water stress-promoted senescence of detached rice leaves was investigated. The senescence was followed by measuring the decrease in protein content. Increased lipid peroxidation was closely correlated with senescence in water stressed leaves. Decrease in superoxide dismutase activity was evident 8 h after beginning of water stress. However, decreased catalase, peroxidase, and ascorbate peroxidase activity was observed only when senescence was observed. Glutathione reductase was not affected by water stress. Free radical scavengers retarded water stress-enhanced senescence.

Keywords: antioxidative enzymes; Oryza sativa

Subjects: antioxidative enzymes, water stress-promoted senescence; ascorbate peroxidase, water stress-promoted senescence; catalase, water stress-promoted senescence; glutathione reductase, water stress-promoted senescence; lipid peroxidation, water stress-promoted senescence; Oryza sativa; peroxidase, water stress-promoted senescence; rice, water stress-promoted senescence; superoxide dismutase, water stress-promoted senescence

Published: March 1, 2000  Show citation