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.
Ali Momenpour; Ali Imani; davod bakhshi; Gholamhasan ranjbar
Abstract
Salinity tolerance threshold of fruit crops is obtained based on the reduction in yield under saline conditions compared to non-saline conditions. In order to determine salinity tolerance threshold and yield reduction per unit increase in soil salinity in selected almond genotypes, a factorial experiment ...
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Salinity tolerance threshold of fruit crops is obtained based on the reduction in yield under saline conditions compared to non-saline conditions. In order to determine salinity tolerance threshold and yield reduction per unit increase in soil salinity in selected almond genotypes, a factorial experiment was carried out. The study was based on completely randomized design (CRD), with two factors: (1) genotypes in 11 types (Tuono, Nonpareil, Mamaei, Shokoufeh, Sahand, Shahrood12, A200,1-25, 1-16 and 13-40 budded on GF677 rootstock, and GF677 rootstock (without budding as control), and (2) salinity of irrigation water at five levels (0.5, 2.5, 4.9, 7.3 and 9.8 dSm-1). At the end of experiment, salinity tolerance threshold and yield reduction slope were calculated based on dry weight (biomass).The results showed that the type and combination of rootstock and scion affect the salinity tolerance threshold and yield reduction slope. The lowest salinity tolerance threshold was observed in 1-16 (2.22 dS/m), Mamaei (2.28 dS/m), and Sahand (2.39 dS/m) genotypes, respectively. On the contrary, the highest salinity tolerance threshold was observed in Shokoufeh (5.80 dS/m), Shahrood12 (4.84 ds/m) and 1-25 (4.80 ds/m).The highest yield reduction slope was observed in 13-40 (8.05%), A200 (7.86%), and Nonpareil (7.55%) genotypes, respectively. In contrast, the lowest yield reduction slope was observed in Shahrood 12 (5.60%). Overall, the results showed the level of salinity that reduced the yield by 50% in Shahrood 12, Shokoufeh, and 1-25, were 5.05, 4.43 and 3.55 dS/m greater than GF677 rootstock (without budding), respectively. EC50 in Shahrood 12, Shokoufeh, 1-25 and GF677 was observed in salinity intensity of 13.23, 12.59, 11.71 and 8.16 dS/m. It should be noted that in previous studies, 100% decrease in yield was reported by salinity level of 7 dS/m, while in Shahrood 12 and Shokoufeh cultivars budded on GF677 rootstock, we observed only 12% and 9% yield reduction by salinity of 7 dS/m. Therefore, we suggest that Shahrood 12 and Shokoufeh cultivars budded on GF677 rootstock could be cultivated in areas with moderate salinity.