Ali Momenpour; Maryam Dehestani; Vali Soltani Gerdfaramarzi; Mohammad Hadirad; Mohammadreza Vazhfeshenas; Amin Anagholi; Fatemeh Ahmadi; Zahra Jamaati
Abstract
In order to determine salinity tolerance threshold and yield decrease per unit increase of soil salinity in selected pomegranate genotypes, a factorial experiment was carried out based on completely randomized design (CRD), with two factors: genotypes in 12 types (Shisheh Kap Ferdus, Malas Yazdi, Malas ...
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In order to determine salinity tolerance threshold and yield decrease per unit increase of soil salinity in selected pomegranate genotypes, a factorial experiment was carried out based on completely randomized design (CRD), with two factors: genotypes in 12 types (Shisheh Kap Ferdus, Malas Yazdi, Malas Saveh, Rabab Neyriz, Golnar Saveh, Golnar Sarvestan, Golnar Shahdad, Narak Lasjerd Semnan, Vahshi Babolsar, Post Siyah Ardakan, Chah Afzal and Voshik Torsh Saravan) and soil salinity at five levels (1.5, 3.8, 6.2, 9.3 and 12.6 dSm-1). According to the results, the lowest salinity tolerance threshold was observed in Voshik Torsh Saravan (3.02 dS/m), Malas Saveh (3.25 dS/m) and Golnar Saveh (3.40 dS/m) genotypes, and the highest salinity tolerance threshold was observed in Golnar Shahdad (4.90 dS/m), Chah Afzal (4.70 dS/m), Post Siyah Ardakan (4.38 dS/m), and Malas Yazdi (4.17 dS/m) genotypes. The highest yield reduction slope was observed in Golnar Saveh (7.89%), Golnar Sarvestan (7.39%), Voshik Torsh Saravan (6.69%), and Malas Saveh (6.33%) genotypes, respectively. In contrast, the lowest yield reduction slope was observed in Chah Afzal (2.83%), Post Siyah Ardakan (2.88%) and Narak Lasjerd Semnan (2.89%) genotypes, respectively. Overall, the results showed the levels of salinity that reduced the yield by 50% in Chah Afzal, Post Siyah Ardakan and Narak Lasjerd Semnan genotypes were about twice greater than salinity that reduced the yield by 50% in Golnar Saveh, Golnar Sarvestan, Voshik Torsh Saravan and Malas Saveh genotypes. EC50 in Chah Afzal, Post Siyah Ardakan, and Narak Lasjerd Semnan genotypes were observed at 22.37, 21.74 and 21.10 dS/m. At salinity level of 8.4 dS/m, yield reductions in Chah Afzal, Post Siyah Ardakan and Narak Lasjerd Semnan genotypes were only 10.47%, 11.58%, and 13.30%, respectively, which were lower than the 50% value previously reported. Therefore, these three genotypes were selected for further studies and planting as rootstocks in Chah Afzal Station of National Salinity Research Center.
Zahra Jamaati; Ali Momenpour; maryam dehestani; Mostafa Shirmardi
Abstract
To evaluate the effect of salinity stress on some of the growth characteristics of selected pomegranate (Punica granatum) genotypes of regions with soil and water salinity, a factorial experiment was carried out based on completely randomized design (CRD). Treatments included two factors: genotypes ...
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To evaluate the effect of salinity stress on some of the growth characteristics of selected pomegranate (Punica granatum) genotypes of regions with soil and water salinity, a factorial experiment was carried out based on completely randomized design (CRD). Treatments included two factors: genotypes including 3 cultivars (‘Post Siyah Ardakan’,‘Rabab Neyriz’ and ‘Chah Afzal’) and irrigation water salinity at 5 levels (1, 3, 5, 7 and 9 dS/m), with 4 replications. The study was conducted at the National Salinity Research Center of Iran in 2018-2019. The results showed that type of genotype and levels of salinity affected morphological and physiological characteristics and concentration of nutrient elements in leaves. In all of the studied genotypes, with increase in salinity concentration, all of studied characteristics including branch height, branch diameter, number of leaves, green leaves percentage, aerial organs fresh and dry weight, relative water content percentage, SPAD, and contents of a, b and total chlorophylls decreased. However, necrotic leaves percentage, dropped leaves percentage, root fresh weight to aerial organs fresh weight ratio, relative ions leakage percentage, Na+ and Cl- percentage and Na+ to K+ ratio increased at higher salinity levels. At salinity level of 7 dS/m, ‘Chah-Afzal’ and ‘Rabab Neyriz’ showed an increase in necrotic leaves (3% and 5.60%, respectively ), dropped leaves (1.05% and 4.83%), relative ions leakage (3.95 % and 8.60%), Na+ (0.31% and 0.67%), Cl- (0.13% and 0.43%), K+ (0.64% and 0.27%) and Na+ to K+ ratio (0.12 and 0.64), compared to 1 dS/m (control) treatment. Also, in ‘Chah-Afzal’ and ‘Rabab Neyriz’, there was a decrease in green leaves (4.06% and 10.43%, respectively), number of total leaves (2.62% and 12.14%), relative water content (5.68% and 9.77%), and total chlorophylls (5.13% and 14.56%), compared to the control. Overall, ‘Chah-Afzal’ and ‘Rabab Neyriz’ were recognized as, respectively, the most tolerant and sensitive genotypes to salinity stress. ‘Chah-Afzal’ genotype tolerated salinity of 7 dS/m by maintaining its growth characteristics and increasing potassium uptake against sodium.