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Regulation of Antioxidant Defense and Hormonal Systems in Two Cut-Flower Rose Cultivars in Response to Different Levels of Zinc Nanoparticles and Their Implications for Growth and Flower Quality
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Rezvan Ghasemi Chamtaghi   , Mohamadreza Salehi Salmi , Ruhollah Abdolinejad , Seid Habibollah Nour-Bakhsh |
| Agricultural Sciences and Natural Resources University of Khuzestan |
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Abstract: (164 Views) |
Zinc nanoparticles (Zn NPs) are recognized as plant growth stimulators, but plant responses are highly dependent on both concentration and genotype. This study aimed to evaluate the morphophysiological and biochemical responses of two commercial cut rose cultivars (‘Jumilia’ and ‘Tanja’) to different concentrations of zinc oxide nanoparticles and to determine the optimal concentration. The experiment was conducted as a factorial arrangement within a randomized complete block design with two factors: cultivar (2) and Zn NP concentration (0, 50, 100, and 200 µM), with three replications. Results revealed significant interaction effects of cultivar and concentration on most traits. The 100 µM concentration was identified as optimal, producing the highest flower diameter (12.77 cm in ‘Jumilia’), flower number, fresh and dry weight, relative leaf water content, and total soluble solids, along with the lowest oxidative damage (malondialdehyde and hydrogen peroxide) and ACC synthase activity. At this concentration, the activities of major antioxidant enzymes were reduced. In contrast, 200 µM Zn NPs triggered defensive responses, including markedly increased antioxidant enzyme activities and proline accumulation, accompanied by a relative decrease in growth and flowering traits. Across all measured traits, ‘Jumilia’ significantly outperformed ‘Tanja’, particularly in membrane stability, efficient antioxidant defense, and the avoidance of excessive responses such as uncontrolled polyphenol oxidase activity observed in ‘Tanja’. In general, the results showed that the response of both rose cultivars to different concentrations of Zn NPs was significant, and the concentration of 100 μM can be recommended as the optimal level for improving growth, flower quality, and physiological indices in both cultivars. Although differences in the magnitude of responses were observed between the two cultivars, both exhibited the best performance at the mentioned concentration compared to other treatment levels.
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| Keywords: Foliar application, Homeostasis, Metabolism, Nanotechnology, Signaling, Toxicity |
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Type of Study: Research |
Subject:
Ornamental plants
Received: 2025/12/20 | Accepted: 2026/04/25 | Published: 2026/05/14
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