Volume 14, Issue 69 (vol. 14, no. 69 2025)
2025, 14(69): 277-298 |
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Safari A, Samsampour D, Soleimanizadeh M. Effect of putrescine and salicylic acid on morphophysiological traits
of rosemary under salinity stress. Plant Process and Function 2025; 14 (69) : 16
URL: http://jispp.iut.ac.ir/article-1-2246-en.html
URL: http://jispp.iut.ac.ir/article-1-2246-en.html
1- DDepartment of Horticultural Sciences, Faculty of Agriculture and Natural Resources, Hormozgan University, Bandar Abbas, Iran
2- Department of Horticultural Sciences, Faculty of Agriculture and Natural Resources, Hormozgan University, Bandar Abbas, Iran ,samsampoor@hormozgan.ac.ir
3- Department of Horticultural Sciences, Faculty of Agriculture and Natural Resources, Hormozgan University, Bandar Abbas, Iran
2- Department of Horticultural Sciences, Faculty of Agriculture and Natural Resources, Hormozgan University, Bandar Abbas, Iran ,
3- Department of Horticultural Sciences, Faculty of Agriculture and Natural Resources, Hormozgan University, Bandar Abbas, Iran
Abstract: (26 Views)
Salinity stress reduces plant growth and performance by disrupting ionic balance, inducing osmotic pressure, and causing oxidative damage. Rosemary, as a salinity-sensitive medicinal plant, is particularly vulnerable under such conditions. Studies have shown that application of putrescine and salicylic acid can mitigate the negative effects of salinity by enhancing antioxidant defenses and regulating osmotic balance. The present study aimed to investigate the effects of putrescine and salicylic acid on growth and physiological responses of rosemary (Rosmarinus officinalis) under salinity stress. Three-month-old rosemary seedlings were foliar-treated every 10 days for one month with different concentrations of putrescine (0, 0.5, 1, and 2 mM) and salicylic acid (0, 0.5, 0.7, and 1 mM). Salinity stress was then applied via irrigation with NaCl at 0, 75, 125, and 150 mM every four days for two months. The results indicated that the combination of putrescine and salicylic acid positively influenced growth, physiological indices, and phytochemical composition. Under 150 mM salinity, the combined treatment of 0.5 mM putrescine and 0.5 mM salicylic acid increased plant height by 25.81% and leaf number by 148.02%. Moreover, 0.5 mM putrescine combined with 1 mM salicylic acid significantly enhanced fresh leaf weight (198.30%) and root dry weight (114%). Salicylic acid at 1 mM showed the greatest effect on relative leaf water content (91.60%). At higher salinity levels (125 and 150 mM), the combination of putrescine and salicylic acid significantly improved physiological traits of rosemary. The highest increase in chlorophyll a was observed in 2 mM putrescine + 0.7 mM salicylic acid and 0.5 mM putrescine + 1 mM salicylic acid treatments (120.97% and 170.21%, respectively), while chlorophyll b peaked at 0.5 mM putrescine + 1 mM salicylic acid (0.55 mg g⁻¹ FW). Furthermore, 0.5 mM putrescine + 1 mM salicylic acid enhanced total phenolic content, and 2 mM putrescine exhibited the highest antioxidant activity (99.4%, equivalent to 40.71% above the control) under 150 mM salinity. Overall, foliar application of putrescine and salicylic acid, individually or in combination, effectively mitigated the adverse effects of salinity stress in rosemary. These findings suggest that exogenous application of these compounds may serve as a practical strategy to improve salinity tolerance in medicinal and aromatic plants such as rosemary.
Article number: 16
Type of Study: Research |
Subject:
Salt Stress
Received: 2025/08/2 | Accepted: 2025/09/2 | Published: 2025/12/16
Received: 2025/08/2 | Accepted: 2025/09/2 | Published: 2025/12/16
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