Plant Process and Function

en Silicon and selenium supplementations modulate antioxidant systems and mineral nutrition to mitigate salinity-alkalinity stresses in cucumber (Cucumis sativus L.) plants under hydroponic conditions Silicon and Selenium supplementations modulate antioxidant systems and mineral nutrition to mitigate salinity-alkalinity stresses in cucumber (Cucumis Sativus L.) plants under hydroponic conditions تنش شوري Salt Stress پژوهشي Research <div dir="ltr">This experiments was conducted to investigate the role of silicon (Si, 75, 100 mg. L-1 sodium silicate) and selenium (Se, 4, 6 mg. L-1 sodium selenate) in ameliorating the salinity (75 mM NaCl and 75 mM NaHCO3) causing strong detrimental effects on mineral ions uptake and the oxidative damage in cucumber (Cucumis sativus L.) plants. Salinity and alkalinity stresses reduced macro and micro elements content which were significantly improved by Si and Se supplementation. Furthermore, peroxide hydrogen was more in salinity- alkalinity stressed plants without Si and Se as compared to those supplemented with Si and Se. Si protected cucumber plants from NaCl induced oxidative damage by improving the activity of antioxidant enzymes (glutathione reductase, guaiacol peroxidase, ascorbate peroxidase). More importantly Si and Se supplementation improved the accumulation of P, Mg, Ca, Fe, Zn, Mn and Cu. In conclusion, Si and Se mitigate the negative effects of NaCl and NaHCO3 in cucumber plants by modifying nutrient uptake and up-regulating antioxidant system.</div> This experiments was conducted to investigate the role of silicon (Si, 75, 100 mg. L-1 sodium silicate) and selenium (Se, 4, 6 mg. L-1 sodium selenate) in ameliorating the salinity (75 mM NaCl and 75 mM NaHCO3) causing strong detrimental effects on mineral ions uptake and the oxidative damage in cucumber (Cucumis sativus L.) plants. Salinity and alkalinity stresses reduced macro and micro elements content which were significantly improved by Si and Se supplementation. Furthermore, peroxide hydrogen was more in salinity- alkalinity stressed plants without Si and Se as compared to those supplemented with Si and Se. Si protected cucumber plants from NaCl induced oxidative damage by improving the activity of antioxidant enzymes (glutathione reductase, guaiacol peroxidase, ascorbate peroxidase). More importantly Si and Se supplementation improved the accumulation of P, Mg, Ca, Fe, Zn, Mn and Cu. In conclusion, Si and Se mitigate the negative effects of NaCl and NaHCO3 in cucumber plants by modifying nutrient uptake and up-regulating antioxidant system. Ascorbate peroxidase, NaCl stress, NaHCO3 stress, Nutrient uptake, Selenate Ascorbate peroxidase, NaCl stress, NaHCO3 stress, Nutrient uptake, Selenate 41 49 http://jispp.iut.ac.ir/browse.php?a_code=A-10-492-1&slc_lang=en&sid=1 Seyed Ali Asghar Mousavi Seyed Ali Asghar Mousavi mousavihort@yahoo.com Yes Department of Horticultural Science, Faculty of Agriculture, Vali Asr University, Rafsanjan. Iran Department of Horticultural Science, Faculty of Agriculture, Vali Asr University, Rafsanjan. Iran Hamid Reza Roosta Hamid Reza Roosta roosta@vru.ac.ir No Department of Horticultural Science, Faculty of Agriculture and Natural Resources, Arak University, Arak Department of Horticultural Science, Faculty of Agriculture and Natural Resources, Arak University, Arak Majid Esmaeilizadeh Majid Esmaeilizadeh esmaeilizadeh@vru.ac.ir No Department of Horticultural Science, Faculty of Agriculture, Vali Asr University, Rafsanjan. Iran Department of Horticultural Science, Faculty of Agriculture, Vali Asr University, Rafsanjan. Iran Saeid Eshghi Saeid Eshghi eshghi@shirazu.ac.ir No Department of Horticultural Science, Faculty of Agriculture, Shiraz University, Shiraz. Iran Department of Horticultural Science, Faculty of Agriculture, Shiraz University, Shiraz. Iran