جستجوی مقالات مرتبط با کلیدواژه « کلر » در نشریات گروه « باغبانی »

In order to evaluate the effects of potassium sulfate and nanopotassium fertilizers on two pistachio cultivars under salinity stress a factorial experiment was conducted in a completely randomized design with four replications. Treatments were three levels of salinity (0.5, 8 and 12 dSm-1) and potassium sulfate fertilizer (1 and 2%) and nano–potassium fertilizer (1 and 2 g L-1). The results showed that Akbari cultivar had the highest total chlorophyll, root potassium and proline contents compared with AhmadAghaei cultivar. The highest chloropyll conten was observed in Akbari cultivar under 0.5 dSm-1 NaCl by application of 2 g L-1 nano–potassium fertilizer. The lowest root sodium content was belonged to Akbari cultivar at 0.5 dSm-1 salinity stress with application of 1% sulfate potassium fertilizer. The minimum and maximunm content of proline was related to the salinity of 0.5 dsm-1 in AhmadAghaei cultivar and 12 dSm-1 in Akbari cultivar, respectively. The highest proline content was obtained by application of 2 g L-1 nano–potassium fertilizer. Application of potassium fertilizers reduced the adverse effects of salinity on pistachio seedlings.

In this study, the effect of different concentrations of sodium chloride (0, 3, 6, 9 and 12 ds/m) on growth characteristics and leaves sodium and chlorine content of eight pomegranate cultivars (Malas Saveh, Malas Esfahan, Rabab Qermez Shiraz, Gabry Yazd, Gabry Torosh Yazd, Zaq Sefid Yazd, Zaq Torsh Yazd and Malas Toq Peshva) was investigated. The experiment was carried out as a factorial based on randomized block designs with three replications. At the end of study, growth characteristics and leaves sodium and chlorine content were determined. With increasing salinity, plant height and diameter, branches number and leaf chlorophyll index were decreased, but the leave necrosis and chlorine and sodium concentration were increased. Shoots fresh and dry weight were increased slightly when salinity increased up to 3 dS/m and thereafter decreased.. The lowest leaf abscission was found in Zaqe Sefid Yazd and Gabry Yazd when treated with 6 and 12 dS/m. At 12 dS/m, the lowest leaf necrosis was found in Malas Esfahan, but at 6 dS/m, Zaq Sefid Yazd and Malas Esfahan showed the lowest decreasing percent respectively. At 9 and 12 dS/m Malas Saveh and Rabab Qermaz Shiraz showed the highest leave necrosis as compared to the control. In salinity of 6 and 12 dS/m, the Gabry Torosh Yazd and Malas Esfahan cultivars showed the lowest decreasing in chlorophyll leaf index respectively. The lowest chlorine and sodium accumulation at 12 dS/m was observed in Malas Toq Pishva and Zaq Sefid Yazd cultivars.

This experiment was conducted to study the improvement of biological yield and physiological indicators of Ajwan by application of polyamines under salt stress conditions in 2018. A factorial study was conducted with a randomized complete design with two factors and three replications. The first factor included four levels of water salinity including the control (without salt stress) and salinities of 1000, 2000 and 3000 mg/l. The second factor included five levels of using zero polyamine, 0.5 and 1.5 mmol/l putrescine and 0.5 and 1.5 mmol/l spermidine. The results showed that increasing the salinity levels resulted in a reduction of the height, the biological yield, the lateral branch and the number of umbels in the plant. The lowest amount of chlorophyll a and b and the highest sodium and chloride content in the salt stress of 3000 mg/l was observed. Under salt stress of 2000 mg/l, the spermidine treatment as 1.5 and 0.5 mmol/l led to an increase in the proline content to the amounts of 44.56 and 40.16% as compared with that of the control. Also, the highest peroxidase in the spermidine treatment of 1.5 and 0.5 mmol/l was observed in the amounts of 3.60 and 3.20 micromoles per minute protein. Therefore, the polyamine compounds lead to the reduction of the salt stress effects through improvement in the physiologic characteristics, including increase in the osmotic adjusting compounds and the activity of antioxidant enzymes. Moreover, the polyamine compound of spermidine has a better function than putrescine.

In order to investigate the interaction effect of salinity and supplementary calcium nitrate on growth, quantitative and qualitative attributes of flowers and mineral composition of Rosa hybrida ‘Ilona’, a factorial experiment was carried out in completely randomized design with three replications. Treatments consisted of four sodium chloride rates (0, 5, 10 and 20 mM sodium chloride) and four supplementary calcium nitrate rates (0, 1, 2, and 3 mM) and three replications, under hydroponic conditions. Results showed that sodium and chloride ions’ concentration in rose leaves was increased to toxic levels as the sodium chloride rates were increased which in turn resulted in a significant reduction in the number of flowers per plant, dry flower weight, flower stem diameter and flower vase life. Also, salinity reduced the concentration of nitrogen, calcium and potassium in the plant leaves. The use of calcium nitrate could somewhat alleviate the adverse effects of salinity. At each level of salinity, calcium nitrate consumption decreased leaf sodium and chlorine concentration and increased nitrogen and calcium content of leaves, number of flowers per plant, flower diameter and flower vase life. Significant decrease in dry weight and number of flowers per plant were respectively in the salinity range of 2.85 to 3.15 and 3.50 to 4.19 dS/m. In these salinities, the average concentration of sodium was equal to 0.34 and 0.46 while chlorine concentration was 0.36 and 1.42% respectively. With increasing salt stress, the effect of calcium nitrate on the improvement of flower vase life was decreased and more calcium nitrate was needed to supply nitrogen and calcium to the plant. Therefore, it could be concluded that under salt stress, the nitrogen and calcium requirements of the plant are higher than non-saline conditions. The results of this research showed that with increasing the salinity, supplementation of calcium nitrate can reduce the adverse effects of salinity on rose flower under hydroponic conditions

Salinity, as an abiotic stress, causes significant losses in horticultural production. Future of grape production, as one of the most important economical horticultural fruits, depends on breeding programs and using salt tolerant rootstocks. The aim of this study was to investigate the salinity tolerance and the distribution of ions associated with salinity in six genotypes and Varieties of grapes (Vitis vinifera L.), namely ‘Shahrudi’, ‘Fakhri Sefid’, ‘Sabz Angur’, ‘Divaneh Kashmar’, SH068 and GT01. The factorial experiment based on Completely Randomized design was carried out with two factors of variety and salinity in three replications. Plants were treated with different salinity levels of less than 2 (1.8-1.9), 4 and 6 dS/m for 40 days. Results showed that increasing the amount of sodium chloride in all genotypes, increased sodium and chloride levels in various organs and Potassium in shoot, while it decreased Potassium concentration in roots, significantly (P