LIPID PEROXIDATION IN RELATION TO SENESCENCE OF MAIZE LEAVES

摘要

Lipid peroxidation in relation to senescence of detached maize leaves in darkness was investigated. There was no change in malondialdehyde (MDA) level in water-treated detached maize leaves during the first day of incubation. Thereafter, there was a significant increase in the level of MDA (lipid peroxidation). Lipid peroxidation seems to be involved in the regulation of the senescence of detached maize leaves. This conclusion was based on the observations that (a) the increase in the level of lipid peroxidation preceded senescence, (b) benzyladenine, which retarded senescence, reduced the increase in lipid peroxidation level, (c) abscisic acid (ABA), methyl jasmonate (MJ) and linolenic acid, which were found to promote senescence, increase the level of lipid peroxidation, and (d) silver thiosulfate, which effectively inhibited MJ-, linolenic acid- and ABA-promoted senescence, reduced MJ-, linolenoc acid- and ABA-increased lipid peroxidation level.