|Effect of oxidative stress caused by hydrogen peroxide on senescence of rice leaves
Ching Huei Kao
|Free radical scavengers;H2 O2;leaf senescence;lipid peroxidation;oryza sativa;oxidative stress
|Institute of Plant and Microbial Biology, Academia Sinica
. Lipid peroxidation is considered to be an important mechanism of leaf senescence. The peroxidation of lipids can be initiated by free radicals. H2 O2 itself is active oxygen species and can react with superoxide radicals to form more reactive hydroxyl radicals in the presence of trace amounts of Fe or Cu. Thus, it is of interest to investigate the relationship between lipid peroxidation and H2 O2-promoted senescence in detached rice leaves. H2 O2 effectively promoted senescence and increased malondialdehyde levels in detached rice leaves under both light and dark conditions. However, the promotion of senescence by the exogenous level of H2 O2 is not associated with an increase in its endogenous level. Thiourea (a scavenger of hydroxyl radical) almost completely prevented H2 O2promoted senescence and the H2 O2-induced decrease in superoxide dismutase and ascorbate peroxidase activities in light and darkness. It seems that promoted senescence by H2 O2 in detached rice leaves is associated free radicalinduced lipid peroxidation.
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