Superoxide dismutase activity in leaf-cell organelles and protective role of 6-BA against damage in corn under waterlogging stress
1992
Li Jiankun | Wang Zongli (Jiangsu Provincial Inst. of Agricultural Sciences, Nanjing (China). Inst. of Agrobiological Genetics and Physiology)
The proportions of superoxide dismutase (SOD) activity in corn leaf-cell organelles under normal growth condition and changes in the SOD activity as affected by waterlogging stress were investigated. The effect of 6-benzylademine (6-BA) on the induced SOD activity in cytosol, chloroplasts and mitochondria of waterlogged corn leaves was also studied. The results indicated that about 85% of the total SOD activity in corn leaves was present in cytosol (11,000 X g supernatant fraction). The rest was in chloroplasts (1000 X g precipitate fraction) and mitochondria (11,000 X g precipitate fraction), approximately 13% and 2 % of the total SOD activity respectively. Waterlogging caused an obvious decrease in SOD activity in all organelles examined. The SOD sensitivity to waterlogging varied with orgnelles. The chloroplast was the most sensitive one. It is interesting to note that applications of 6-BA (10 ppm) just before waterlogging and 12 h later led to an apparent increase in SOD activity in all cell components examined, and to a marked decrease in membrane lipid peroxidation in the leaves. Thus, 6-BA enhanced the resistance of corn plants to waterlogging
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