Journal
PLANT AND SOIL
Volume 225, Issue 1-2, Pages 193-200Publisher
SPRINGER
DOI: 10.1023/A:1026512921026
Keywords
anti-oxidant; GSH-Px; pro-oxidant; ryegrass; selenium; SOD; tocopherol
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Selenium is an essential element for antioxidation reactions in human and animals. In order to study its biological role in higher plants, ryegrass ( Lolium perenne) was cultivated in a soil without Se or amended with increasing dosages of H2SeO4 (0.1, 1.0, 10.0 and 30.0 mg Se kg(-1)). Ryegrass was harvested twice and the yields were analyzed for antioxidative systems and growth parameters. Selenium exerted dual effects: At low concentrations it acted as an antioxidant, inhibiting lipid peroxidation, whereas at higher concentrations, it was a pro-oxidant, enhancing the accumulation of lipid peroxidation products. The antioxidative effect was associated with an increase in glutathione peroxidase (GSH-Px) activity, but not with superoxide dismutase (SOD) and alpha -tocopherol, which was the only tocopherol detected. In the second yield, the diminished lipid peroxidation due to a proper Se addition coincided with promoted plant growth. The oxidative stress found at the Se addition level greater than or equal to 10 mg kg(-1) resulted in drastic yield losses. This result indicates that the toxicity of Se can be attributed, in addition to metabolic disturbances, to its pro-oxidative effects. Neither the growth-promoting nor the toxic effect of Se could be explained by the changes in the total chlorophyll concentration.
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