Effects of active oxygen scavengers on the activities of protective enzymes in waterlogged corn plants.
1991
Li Jiankun | Wang Zongli | Wang Zhixia
Sodium diethyl-dithiocarbamate (DDTC), an inhibitor of superoxide dismutase (SOD) and seven kinds of active oxygen scavengers, i.e. 8-hydroxyquinoline (8-HQ), diphenylamin (DPA), alpha-tocopherol (VE), propyl gallate (PG), sodium benzoate (SB), mannitol (MT), and ascorbate (ASC) were used to spray over corn plants at the beginning of waterlogging and once again 12 hours after waterlogging. Waterlogging treatments were done at the 4-leaf stage. Experimental results showed that DDTC inhibited not only the activity of SOD, but also the activity of catalase in corn leaves, thus increasing malondialdehyde (MDA) content greatly in the leaves of waterlogged corn plants. In other experiments, the waterlogged corn plants sprayed with seven kinds of active oxygen scavengers were less injured. The production of membrane lipid peroxidation, as determined by MDA content in the leaves of waterlogged corn plants, were decreased obviously. Further observations found that the SOD activity was increased markedly and the catalase activity was also enhanced in the leaves of waterlogged corn plants treated with these scavengers, indicating that active oxygens in plant cells were scavenged by the direct effects and the indirect enzyme reactions of these scavengers. It is suggested that active oxygens play an important role in the course of waterlogging injury. The results provided theoretical evidence that the waterlogging injury to corn plants might be lessened by spraying antioxidants.
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