Volume 13, Issue 60 (vol. 13, no. 60 2024)
2024, 13(60): 167-184 |
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Pirinejad S, Mumivand H, Ehtesham Nia A, Raji M R. The effect of ultraviolet A and B radiation on morpho-physiological and antioxidants characteristics of rosemary (Rosmarinus officinalis L.). Plant Process and Function 2024; 13 (60) : 10
URL: http://jispp.iut.ac.ir/article-1-1959-en.html
URL: http://jispp.iut.ac.ir/article-1-1959-en.html
1- Department of Horticultural Sciences, Faculty of Agriculture, Lorestan University, Lorestan, Iran
2- Department of Horticultural Sciences, Faculty of Agriculture, Lorestan University, Lorestan, Iran ,mumivand.h@lu.ac.ir
2- Department of Horticultural Sciences, Faculty of Agriculture, Lorestan University, Lorestan, Iran ,
Abstract: (352 Views)
Over the past few decades, human industrial activities have significantly reduced the blocking effect of the ozone layer in the stratosphere. As a consequence, there has been an increase in the penetration of ultraviolet (UV) radiation to the Earth's surface. This amplified exposure to UV rays poses a serious threat to living organisms, particularly plants. In our study, we investigated the impact of UV-A and UV-B radiation on some morpho-physiological traits as well as enzymatic and non-enzymatic antioxidants of rosemary (Rosmarinus officinalis L.). The study was conducted using a completely randomized design with three replications. UV radiation treatments were applied at three levels: control (no UV radiation), UV-A radiation, and UV-B radiation. The UV radiation was administered using broadband lamps manufactured by Q-Lab in the USA. These 40-watt lamps were employed for a duration of four hours per day. Our findings reveal that exposure to UV-B radiation resulted in a decrease in leaf dry weight, plant height, and the levels of chlorophyll a, b, and total chlorophyll by 29.57%, 13.44%, 17.7%, 33.77%, and 22.51%, respectively, compared to the control. Conversely, UV-B radiation led to an increase in the levels of non-enzymatic antioxidants such as carotenoids, phenols, and total flavonoids. Additionally, the activity of enzymatic antioxidants, including peroxidase, catalase, and ascorbate peroxidase enzymes, as well as the levels of proline and malondialdehyde, exhibited significant increases of 23.45%, 37.54%, 41.59%, 82.75%, 412.5%, 100%, 87.5%, and 359.32%, respectively, compared to the control. Regarding UV-A treatment, the levels of chlorophyll a, b, and total chlorophyll decreased. However, there was an increase in the levels of malondialdehyde, proline, and the activity of antioxidant enzymes catalase and peroxidase. Overall, the rosemary plants exposed to UV-B radiation exhibited higher quality in terms of medicinal and biological properties due to the increased presence of UV-absorbing compounds such as phenols, flavonoids, and carotenoids. However, it is worth noting that the yield of the plant decreased under UV-B treatment.
Article number: 10
Type of Study: Research |
Subject:
Horticulture
Received: 2023/08/29 | Accepted: 2023/11/13 | Published: 2024/06/18
Received: 2023/08/29 | Accepted: 2023/11/13 | Published: 2024/06/18
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