Volume 14, Issue 68 (vol. 14, no. 68 2025)
2025, 14(68): 69-86 |
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Roostaei P, Kiarostami K, Nazem Bokaei Z, Abdoli M. Physiological responses of lemon balm (Melissa officinalis L.) to manganese oxide nanoparticle toxicity. Plant Process and Function 2025; 14 (68) : 5
URL: http://jispp.iut.ac.ir/article-1-2152-en.html
URL: http://jispp.iut.ac.ir/article-1-2152-en.html
1- Department of Plant Sciences, Faculty of Biological Sciences, Al-Zahra University, Vanak, Tehran, Iran
2- Department of Plant Sciences, Faculty of Biological Sciences, Al-Zahra University, Vanak, Tehran, Iran ,prustaye@gmail.com
3- Department of Plant Production and Genetics, Faculty of Agriculture, Malayer University, Malayer, Iran
2- Department of Plant Sciences, Faculty of Biological Sciences, Al-Zahra University, Vanak, Tehran, Iran ,
3- Department of Plant Production and Genetics, Faculty of Agriculture, Malayer University, Malayer, Iran
Abstract: (110 Views)
Lemon balm, a wild medicinal plant, is exposed in nature to environmental pollutants from industrial, domestic, and agricultural sources. This study investigates the physiological responses of lemon balm to high concentrations of manganese oxide nanoparticles (Mn2O3 NPs). The aim was to understand how this medicinal plant responds to Mn2O3 nanoparticles at concentrations of 0, 250, 500, 750, and 1000 ppm. Mn2O3 NP foliar spray was applied to 120-day-old plants in a completely randomized design. Indices measured to evaluate the effects of Mn2O3 NPs on the plants included relative water content, total phenolic content, total flavonoids, lipid peroxidation, chlorophylls, carotenoids, total protein, proline, and activities of the antioxidant enzymes catalase, peroxidase, superoxide dismutase, as well as phenylalanine ammonia-lyase (PAL) and cinnamate-4-hydroxylase (C4H). Additionally, soluble and insoluble carbohydrate contents, rosmarinic acid, and the expression of the RAS and PAL genes were examined. The results showed that the 250 and 500 ppm treatments increased the production of reactive oxygen species and defense enzyme activities in leaves, while reducing secondary metabolite contents. At 750 ppm, plants exhibited a significant decrease in hydrogen peroxide (H2O2) and malondialdehyde (MDA) and a significant increase in proline by 92.15%, 43.24%, and 54.0%, respectively. Conversely, at 1000 ppm, despite significant stress indices, there were notable increases in antioxidant capacity, total phenolics, flavonoids, rosmarinic acid, and the activities of PAL and C4H by 62.20%, 46.12%, 37.29%, 88.21%, 33.25%, and 9.19%, respectively, compared with the control. Taken together, these results indicate that lemon balm can tolerate certain concentrations of Mn oxide contamination. Further studies could explore its potential as a plant for environmental remediation and its use in programs aimed at rehabilitating contaminated sites.
Article number: 5
Type of Study: Research |
Subject:
Toxic ions stress
Received: 2024/12/9 | Accepted: 2025/01/27 | Published: 2025/10/29
Received: 2024/12/9 | Accepted: 2025/01/27 | Published: 2025/10/29
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