Abstract
Using the whole plant and model systems, we demonstrate that the aluminum ions (Al3+) stimulate phenolic-dependent lipid peroxidation. Lipid peroxidation in barley (Hordeum vulgare L. cv. Donor) roots was 30 % higher under AlCl3 treatment than without Al. Major decomposition product of lipid peroxidation was 4-hydroxynonenal (4-HNE) but not thiobarbituric acid reactive substances (TBARS), a widely used markers for lipid peroxidation. Similarly, AlCl3 stimulated lipid peroxidation of soybean liposomes in the presence of chlorogenic acid (CGA) and H2O2/horseradish peroxidase system which can oxidize phenolics. Al3+ was found to enhance lipid peroxidation induced by oxidized CGA. Intermediates of lignin biosynthesis in plants, including p-coumaric acid, ferulic acid, sinapic acid and coniferyl alcohol, also showed similar effects. These results suggest that Al3+ has a potential to induce oxidative stress in plants by stimulating the prooxidant nature of endogenous phenolic compounds.
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