| چکیده
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Drought is an important environmental stress that has negative efects on plant growth leading to
a reduction in yield. In this study, the positive role of nanoparticles of SiO2, Se, and Se/SiO2 (SiO2NPs, Se-NPs and Se/SiO2-NPs) has been investigated in modulating negative efects of drought on
the growth and yield of strawberry plants. Spraying of solutions containing nanoparticles of SiO2,
Se, and Se/SiO2 (50 and 100 mg L−1) improved the growth and yield parameters of strawberry plants
grown under normal and drought stress conditions (30, 60, and 100%FC). Plants treated with Se/SiO2
(100 mg L−1) preserved more of their photosynthetic pigments compared with other treated plants
and presented higher levels of key osmolytes such as carbohydrate and proline. This treatment also
increased relative water content (RWC), membrane stability index (MSI) and water use efciency
(WUE). In addition, exogenous spraying of Se/SiO2 increased drought tolerance through increasing
the activity of antioxidant enzymes including catalase (CAT), ascorbate peroxidase (APX), guaiacol
peroxidase (GPX) and superoxide dismutase (SOD) as well as decreasing lipid peroxidation and
hydrogen peroxide (H2O2) content. Increase in biochemical parameters of fruits such as anthocyanin,
total phenolic compounds (TPC), vitamin C and antioxidant activity (DPPH) in strawberry plants
treated with Se/SiO2 under drought stress revealed the positive efects of these nanoparticles in
improving fruit quality and nutritional value. In general, our results supported the positive efect of the
application of selenium and silicon nanoparticles, especially the absolute role of Se/SiO2 (100 mg L−1),
on the management of harmful efects of soil drought stress not only in strawberry plants, but also in
other agricultural crops.
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