![]() ![]() The activities of glutathione reductase (GR) and glutathione peroxidase (GPX) remained unchanged under heat stress. Upon heat treatment the activities of ascorbate peroxidase (APX), glutathione S-transferase (GST) and glyoxalase I (Gly I) were increased, while the activities of monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), and catalase (CAT) were decreased. The content of reduced glutathione (GSH) increased only at 24 h of stress, while glutathione disulfide (GSSG) markedly increased at both duration of heat exposure with associated decrease in GSH/GSSG ratio. Ascorbate (AsA) content decreased at any duration of heat treatment. Heat stress caused decrease in chlorophyll and leaf relative water content (RWC) and increased malondialdehyde (MDA), hydrogen peroxide (H 2O 2), proline (Pro), and methylglyoxal (MG) contents. Ten-day-old seedlings which had been supplemented with Se (25 μM Na 2SeO 4) or not were grown separately under control temperature (25 ☌) or high temperature (38 ☌) for a period of 24 or 48 h in nutrient solution. ![]() We investigated the protective role of selenium (Se) in minimizing high temperature-induced damages to rapeseed ( Brassica napus L. ![]()
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