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Effect of Selenium on Alleviating Oxidative Stress Caused by a Water Deficit in Cucumber Roots

Department of Plant Physiology, Poznań University of Life Sciences, Poznań 60-637, Poland
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Plants 2019, 8(7), 217; https://doi.org/10.3390/plants8070217
Received: 30 May 2019 / Revised: 18 June 2019 / Accepted: 20 June 2019 / Published: 11 July 2019
(This article belongs to the Special Issue Selenium Metabolism and Accumulation in Plants)
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Abstract

The aim of the study was to evaluate the antioxidant activity of selenium in the roots of Cucumis sativus L. seedlings pre-treated with selenium (Se) in the form of sodium selenite at concentrations of 1, 5, and 10 µM, and then subjected to a water deficit (WD). It has been hypothesized that Se, in low concentrations, alleviates an oxidative stress caused by a WD in the cucumber roots. A WD was introduced by the surface dehydration of roots. The aim of the research was to compare the changes accompanying oxidative stress in plants growing in the presence of Se and in its absence. The study concerns the generation of reactive oxygen species (ROS)—superoxide anions (O2•−), hydrogen peroxide (H2O2), and hydroxyl radicals (OH)—as well the activities of the antioxidant enzymes lowering the ROS level—ascorbate peroxidase (APX), peroxidase (POX), catalase (CAT), and superoxide dismutase (SOD). A WD caused oxidative stress, i.e., the enhanced generation of ROS. Selenium at the concentrations of 1 and 5 μM increased the tolerance of cucumber seedlings to oxidative stress caused by a WD by increasing the activities of the antioxidant enzymes, and it also limited the damage of plasma membranes as a result of the inhibition of lipid peroxidation. View Full-Text
Keywords: selenium; water deficit; Cucumis sativus L.; roots; oxidative stress; antioxidant enzymes selenium; water deficit; Cucumis sativus L.; roots; oxidative stress; antioxidant enzymes
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Jóźwiak, W.; Politycka, B. Effect of Selenium on Alleviating Oxidative Stress Caused by a Water Deficit in Cucumber Roots. Plants 2019, 8, 217.

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