تأثير السيلينيوم النانوي على مؤشرات الإجهاد التأكسدي و الفعالية الأنزيمية في نخيل التمر Phoenix dactylifera L. صنف البرحي النسيجي تحت إجهاد الملوحة

Abstract EN

This study was conducted in order to find out the effects of selenium nanoparticles (SeNPs) on the antioxidant responses in the date palm of the Barhi cultivar derived from tissue culture under the stress of different salt levels.

The field study was carried out at the Fadak orchard in the Kutaiban area of the Shatt al-Arab district during the 2020–2021 growing season.

Three levels of SeNPs (0, 80, and 160) ppm were used as foliar spray on the leaves of palm trees exposed to the stress of four levels of salinity (2.5 (control), 5, 10, and 20) ds m-1 .

The results of the study showed that salinity, especially at 20 ds m-1, led to a significant increase in the accumulation of oxidative indices in date palm leaves, which included MDA (4.47 nmole g-1) and hydrogen peroxide (3.34 µmole g-1), as well as a significant increase in the activity of catalase and peroxidase enzymes, which amounted to 32.94 and 23.11 unit-1 g-1 Min-1, respectively compared to control treatment.

While salinity at this level led to a decrease in the value of the membrane stability index from 75.04% in control plants to 62.13%.

The results of the study proved that foliar spray of SeNPs at 80 ppm improved the antioxidant response of date palm by reducing the accumulation of MDA and hydrogen peroxide compounds and increasing the value of the membrane stability index and the activity of catalase and peroxidase enzymes compared to their levels in all saline concentrations tested levels in this study, while the results of spraying at a concentration of 160 ppm In contrast to that