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Evaluation of Biochemical and Antioxidant Changes of Two Strawberries (Paros and Queen Eliza) Cultivars under Deficit Irrigation Conditions
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Mohammad Sarsaifee   , Ali Solamani , Naser Ghaderi , Esmaail Amiri |
| University of Zanjan |
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Abstract: (440 Views) |
The current study aimed to investigate the impact of water deficit treatment on the antioxidant and biochemical properties of the fruits and leaves of two strawberry cultivars, namely Fragaria × ananassa Duch. 'Paros' and 'Queen Eliza'. The study was conducted over two consecutive years (2019–2020) and across different growing seasons-spring, summer, and autumn-to gain a comprehensive understanding of the plants' responses to water stress. The experiment was carried out in a split-plot design with a completely randomized block layout at the agricultural research station in Graze, Sanandaj City. The study included three levels of irrigation: 0%, 30%, and 65% soil moisture depletion, applied in a hilling planting system with drip irrigation in a soil bed. The results of the study revealed that the lowest amount of ascorbate (44.8 mmol/g DW) was observed in the control treatment, while the highest amount (73.5 mmol/g DW) was observed in the severe water stress treatment. Similarly, the amount of glutathione (in mmol/g DW) in the severe water stress treatment showed an increase of approximately 74% compared to the control treatment. Furthermore, our findings indicated that the contents of polyphenol oxidase (PPO) and phenylalanine ammonia-lyase (PAL) significantly increased with the increase in water stress treatment in strawberry leaves. The highest amounts of PAL (43.3 protein units per mg) and PPO (0.58 protein units per mg) were observed in the severe water stress treatment during the summer season. The antioxidant capacity, as well as the total phenol and flavonoid content, exhibited an increase with rising water stress levels. Under severe water stress conditions, the amounts of these parameters increased by 35%, 48%, and 92%, respectively, compared to the control. The interaction effect of cultivar and year on PAL enzyme and phenolic acid content was significant, particularly in the summer and autumn seasons. The mean comparison test showed that the highest amounts of these characteristics were observed in 'Queen Eliza', with 41.67 units per mg of protein and 4.80 mg/g FW, respectively. Overall, the biochemical characteristics of the fruit were maintained and improved under low-stress deficit irrigation treatment. The changes in characteristics in leaves and fruits also indicated that 'Queen Eliza' had higher tolerance compared to the other cultivar.
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| Keywords: Antioxidant properties, Drought stress, Polyphenols, Strawberry, Proline |
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Full-Text [PDF 580 kb]
(116 Downloads)
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Type of Study: Research |
Subject:
Environmental stresses
Received: 2023/10/7 | Accepted: 2024/07/19 | Published: 2025/03/8
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