Volume 15, Issue 74 (vol. 15, no. 74 2026)
jispp 2026, 15(74): 61-94 |
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Mohammadi H, Pakkish Z, Saffari V R. Modulation of polygalacturonase activity and enhancement of antioxidant capacity in ‘Elberta’ peach fruit by the interaction of preharvest and postharvest methyl jasmonate and salicylic acid treatments. jispp 2026; 15 (74) : 4
URL: http://jispp.iut.ac.ir/article-1-2261-en.html
URL: http://jispp.iut.ac.ir/article-1-2261-en.html
1- Department of Horticultural Sciences, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran
2- Department of Horticultural Sciences, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran ,zahrapakkish@uk.ac.ir
2- Department of Horticultural Sciences, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran ,
Abstract: (191 Views)
Peach (Prunus persica L.) is a stone fruit with high nutritional and economic value, yet it is highly susceptible to chilling injury and postharvest decay. This study aimed to evaluate the effects of methyl jasmonate (100 and 200 mg L⁻¹), salicylic acid (1 and 2 mM), and different spraying timings (green tip, pink tip, and postharvest) on the physiological and antioxidant characteristics of ‘Elberta’ peaches. Results demonstrated that both pre- and postharvest treatments significantly improved fruit storability. The percentage of damaged fruits in the control at the green tip stage was 40.35%, whereas the combination of 200 mg L⁻¹ methyl jasmonate and 1 mM salicylic acid reduced this to 9.22%, representing a 77% decrease compared to the control. Fruit firmness also increased to 2.77 kg cm⁻², approximately 15% higher than the control. Polygalacturonase activity in the control at the green tip stage was 4.93 units/g FW, while the same combined treatment reduced enzyme activity by 49.5%, showing the strongest inhibitory effect. Total soluble solids reached 20.83%, reflecting a 79% increase over the control, and vitamin C content increased by approximately 46%. Antioxidant enzyme activities, including catalase and peroxidase, increased by 14% and 43%, respectively, whereas hydrogen peroxide levels and membrane lipid peroxidation decreased by 54% and 33%. These findings indicate that preharvest application of methyl jasmonate in combination with salicylic acid, especially at the green tip stage, effectively mitigates oxidative stress, reduces membrane damage, and enhances postharvest longevity and fruit quality. Overall, the combination of 200 mg L⁻¹ methyl jasmonate and 1 mM salicylic acid applied at the green tip stage was identified as the most effective strategy to improve both physicochemical quality and storability of ‘Alberta’ peaches, with significant implications for nutritional value and economic returns.
Article number: 4
Keywords: Postharvest quality, Oxidative stress, Antioxidant enzymes, Fruit firmness, Lipid peroxidation, Plant hormone interactions
Type of Study: Research |
Subject:
Horticulture
Received: 2025/09/21 | Accepted: 2026/02/10 | Published: 2026/10/31
Received: 2025/09/21 | Accepted: 2026/02/10 | Published: 2026/10/31
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