جستجوی مقالات مرتبط با کلیدواژه "سلنات سدیم" در نشریات گروه "زیست شناسی"

Selenium and hydrogen sulfide can alleviate the adverse effects of oxidative stress on plants by improving the oxidative defense system. In order to improve the oxidative defense system of garlic under lead and salinity stress by selenium and hydrogen sulfide, a factorial experiment was carried out using selenium and hydrogen sulfide in a completely randomized design with three replications. Experimental treatments included sodium chloride at three levels of zero, 25 and 75 mM, lead at three concentrations of zero, 10-5 and 10-3 M lead nitrate as well as stress ameliorators in three levels (5 mg / L sodium selenate, 200 μm sodium hydrogen sulfide and control). The results showed that with increasing salinity and lead concentration, a significant decrease in root length and dry weight was observed. In the treatment of 10-5 M lead under 75 mM salinity, the activity of antioxidant enzymes superoxide dismutase, ascorbate peroxidase and catalase were 4.44, 11.76 and 10.47%, respectively, and compared to the zero lead stress and 75 mM, salinity was improved with selenium application. In general, sodium selenate and sodium hydrogen sulfide decreased the uptake of lead in root tissue whereas increased the length and dry weight of roots under salinity stress at a concentration of 10-5 M, but at a concentration of 10-3 M lead, this effect was not observed. Overall results showed that the positive effect of selenium on hydrogen sulfide during salinity stress was more evident in reducing the negative effects of lead. It seemed that selenium suppressant improved the growth parameters of garlic roots under salinity stress and low lead concentrations by reducing lead absorption and increasing the activity of antioxidant enzymes.

The study was conducted to evaluate the effect of foliar application of sodium selenate and sodium selenite and different flowering stages on growth indices of Echium amoenum Fisch. & Mey as a factorial experiment in a completely randomized block design with three replications in 1397 in northern Iran. Treatments included foliar application of sodium selenate and sodium selenite with four levels (2, 4, 8 and 16 mg/l). Also, the plant without foliar application was considered as a control treatment. Foliar application was done in four stages: two true leaves, ten true leaves, two weeks before flowering and one week before flowering. Fresh and dry weight of shoots, flowers and roots, plant height, number of leaves, flowers and flowering stems in the plant and the length of the highest root at different stages of flower harvest (beginning of flowering, mid-flowering and end of flowering) were evaluated. The results of this study showed that the effect of selenium sources and flowering stages significantly affected the growth indices of Iranian borage. The highest fresh and dry shoot weight, plant height, number of leaves and flowering stems, at the end of flowering and in the treatment of 4 mg/l sodium selenate and the highest fresh and dry weight of flowers and number of flowers in the middle of flowering and in the treatment of 4 mg/l Sodium selenate was obtained, also the highest fresh and dry weight of roots and the length of the highest roots were obtained at the end of flowering and in the treatment of 8 mg/l sodium selenate. In general, the results of this experiment showed that the concentration of 4 mg/l sodium selenate significantly increased the morphological characteristics of the plant, while its higher concentration had a negative effect on the growth characteristics of Echium amoenum Fisch. & Mey

In order to study the effect of Sodium Selenate, Titanium dioxide and Growth regulator (Hamon Green®) on some physiological traits, yield and oil content of Goldasht cultivar of safflower under drought stress, a split plot experiment was conducted in a randomized complete block design with three replications in Agricultural Research Center of Zabol University (Chah-e-Nime). The main factor included irrigation cut off levels based on the phenological stages of growth in three levels: I1 = control (complete irrigation), I2= irrigation up to stage R2 (flowering) and I3= irrigation up to stage R1 (branching) and sub-factor including control(not spraying), Sodium selenate (2 mM), Titanium dioxide (0.03%), Growth regulator (0.1 L). Drought stress reduced biological yield, seed yield, 1000 seed weight, relative water content and chlorophyll content (SPAD), but seed and biological yield did not differ significantly between two levels of I1 and I2. The highest amounts of catalase(I2+not spraying),and proline, ascorbate and guaiacol peroxidase was obtained from the interaction of stress(I3) and not spraying. The highest amount of soluble carbohydrates was observed in irrigation + Hamon Green® spraying. The treatments applied did not have a significant effect on seed oil percentage. In general, treatment in order to observe water consumption in the production of safflower in Goldsch cultivar seems appropriate.