Volume 17, Issue 1 (Journal of Soil and Plant Interactions 2026)
2026, 17(1): 75-94 |
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1- Department of Horticultural Sciences, Sari University of Agriculture and Natural Resources, Sari, Iran
2- 1- Department of Horticultural Sciences, Sari University of Agriculture and Natural Resources, Sari, Iran 2- Department of Agricultural Engineering, Mahrat National University, Tehran, Iran ,somaye.tayefeh1388@gmail.com
2- 1- Department of Horticultural Sciences, Sari University of Agriculture and Natural Resources, Sari, Iran 2- Department of Agricultural Engineering, Mahrat National University, Tehran, Iran ,
Abstract: (184 Views)
Background and Objective: Previous studies have demonstrated that salicylic acid, as a plant growth regulator, effectively mitigates the detrimental effects of abiotic stresses including salinity in plants; however, limited information is available regarding its impact on ornamental plants, particularly ornamental kale. This study aimed to investigate the effects of salicylic acid (SA) on tolerance of ornamental kale (Brassica oleracea var. acephala) under salinity stress.
Methods: This study was conducted as a factorial experiment in a complete randomized blocks design with three replications in a greenhouse. Two experimental treatments were evaluated: salicylic acid concentrations (0, 100, and 200 mg L-1) and salinity levels (0, 2.5, and 5.12 dS m-1). Fifty-four ornamental kale seedlings at the four-leaf stage were planted in 27 pots containing mixture of loam soil, perlite, and cocopeat. Salicylic acid was applied via foliar spraying five times (every three days) over two weeks, followed by salinity stress induced using sodium chloride solution over two weeks. Plants were nourished with Hoagland’s solution. Measured traits included morphological characteristics, physiological parameters and phytochemical properties as assessed using standard protocols.
Results: The results showed that salinity alone negatively affected growth traits, particularly reducing leaf number. However, salicylic acid significantly mitigated these adverse effects. At 2.5 dS m-1 salinity, 200 mg L-1 salicylic acid increased chlorophyll a by 195% and chlorophyll b by 65% compared to the control. At 5.12 dS m-1 salinity, 100 mg L-1 salicylic acid improved leaf turgor weight by 20% and significantly enhanced antioxidant capacity. Total phenol and flavonoid contents also increased significantly after salicylic acid application.
Conclusion: Salicylic acid enhanced moderate salinity tolerance in ornamental kale by improving photosynthesis, maintaining water balance, and increasing antioxidant compounds. Salicylic acid concentrations of 100 and 200 mg L-1 were most effective at 2.5 dS m-1 salinity. Application of this growth stimulant is recommended for developing sustainable green spaces in moderately saline areas.
Methods: This study was conducted as a factorial experiment in a complete randomized blocks design with three replications in a greenhouse. Two experimental treatments were evaluated: salicylic acid concentrations (0, 100, and 200 mg L-1) and salinity levels (0, 2.5, and 5.12 dS m-1). Fifty-four ornamental kale seedlings at the four-leaf stage were planted in 27 pots containing mixture of loam soil, perlite, and cocopeat. Salicylic acid was applied via foliar spraying five times (every three days) over two weeks, followed by salinity stress induced using sodium chloride solution over two weeks. Plants were nourished with Hoagland’s solution. Measured traits included morphological characteristics, physiological parameters and phytochemical properties as assessed using standard protocols.
Results: The results showed that salinity alone negatively affected growth traits, particularly reducing leaf number. However, salicylic acid significantly mitigated these adverse effects. At 2.5 dS m-1 salinity, 200 mg L-1 salicylic acid increased chlorophyll a by 195% and chlorophyll b by 65% compared to the control. At 5.12 dS m-1 salinity, 100 mg L-1 salicylic acid improved leaf turgor weight by 20% and significantly enhanced antioxidant capacity. Total phenol and flavonoid contents also increased significantly after salicylic acid application.
Conclusion: Salicylic acid enhanced moderate salinity tolerance in ornamental kale by improving photosynthesis, maintaining water balance, and increasing antioxidant compounds. Salicylic acid concentrations of 100 and 200 mg L-1 were most effective at 2.5 dS m-1 salinity. Application of this growth stimulant is recommended for developing sustainable green spaces in moderately saline areas.
Type of Study: Research |
Subject:
Plant growth under stressful conditions
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Journal of Soil and Plant Interactions by http://jspi.iut.ac.ir is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.
This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.
