Volume 15, Issue 73 (vol. 15, no. 73 2026)
2026, 15(73): 35-44 |
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Zomorodnia R, Karimi M, Hatami M. Melatonin-mediated improvement of ionic homeostasis and antioxidant defense enhances salinity tolerance in Damask Rose (Rosa damascene). Plant Process and Function 2026; 15 (73) : 4
URL: http://jispp.iut.ac.ir/article-1-2266-en.html
URL: http://jispp.iut.ac.ir/article-1-2266-en.html
1- Department of Horticultural Sciences, Faculty of Agricultural Sciences, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
2- Department of Horticultural Sciences, Faculty of Agricultural Sciences, Sari Agricultural Sciences and Natural Resources University, Sari, Iran ,karimi1320@gmail.com
3- Department of Medicinal Plants, Faculty of Agriculture and Environment, Arak University, Arak, Iran
2- Department of Horticultural Sciences, Faculty of Agricultural Sciences, Sari Agricultural Sciences and Natural Resources University, Sari, Iran ,
3- Department of Medicinal Plants, Faculty of Agriculture and Environment, Arak University, Arak, Iran
Abstract: (43 Views)
This study investigated the role of melatonin in alleviating salinity stress in Rosa damascena. A factorial experiment was conducted in a completely randomized design with three replications, combining four salinity levels (0, 60, 120, and 180 mM NaCl) and three melatonin concentrations (0, 150, and 250 μM). Salinity significantly inhibited shoot and root growth, reduced chlorophyll and carotenoid contents, and decreased relative water content (RWC), while increasing electrolyte leakage, proline, malondialdehyde (MDA), and sodium accumulation. Melatonin application significantly alleviated these adverse effects. Under non-saline conditions, 250 μM melatonin enhanced chlorophyll a and carotenoids by 23.8% and 57.6%, respectively, compared with the control, and significantly increased antioxidant enzyme activities, particularly superoxide dismutase (SOD) and catalase (CAT). Similarly, at moderate salinity levels (60–120 mM), 250 μM melatonin maintained high enzyme activity and improved potassium retention. However, under severe salinity (180 mM NaCl), 150 μM melatonin was more effective in maintaining water balance, reducing ion leakage by up to 20%, lowering MDA by 31%, and decreasing Na+ accumulation by up to 53%. The shift in optimal concentration from 250 μM under non-saline or mild stress to 150 μM under severe stress reflects the plant’s adaptive regulation, where higher melatonin enhances growth under optimal conditions, whereas moderate levels suffice to activate antioxidant defenses and maintain ionic balance under stress. Overall, melatonin within the 150 –250 μM range effectively enhanced antioxidant activity, ionic homeostasis, and salinity tolerance in R. damascene.
Article number: 4
Type of Study: Research |
Subject:
Salt Stress
Received: 2025/10/3 | Accepted: 2025/12/8 | Published: 2026/07/27
Received: 2025/10/3 | Accepted: 2025/12/8 | Published: 2026/07/27
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