Journal
PLANTS-BASEL
Volume 8, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/plants8070217
Keywords
selenium; water deficit; Cucumis sativus L; roots; oxidative stress; antioxidant enzymes
Categories
Funding
- Ministry of Science and Higher Education [005/RID/2018/19]
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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 mu M, 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 (O-2(center dot-)), hydrogen peroxide (H2O2), and hydroxyl radicals ((OH)-O-center dot)-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 mu M 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.
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