Volume 15, Issue 72 (vol. 15, no. 72 2026)
2026, 15(72): 173-192 |
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Orooji M R, Danaee E. The effect of sodium nitroprusside and potassium silicate on growth indices and antioxidant activity of Rosemary (Rosmarinus officinalis L.) under deficit irrigation conditions. Plant Process and Function 2026; 15 (72) : 11
URL: http://jispp.iut.ac.ir/article-1-2270-en.html
URL: http://jispp.iut.ac.ir/article-1-2270-en.html
1- Department of Horticulture, Ga. C., Islamic Azad University, Garmsar, Iran
2- Department of Horticulture, Ga. C., Islamic Azad University, Garmsar, Iran ,dr.edanaee@iau.ac.ir
2- Department of Horticulture, Ga. C., Islamic Azad University, Garmsar, Iran ,
Abstract: (32 Views)
Water deficit is one of the most critical factors limiting plant growth and production, and identifying strategies to increase plant tolerance to this stress is of high practical importance. Sodium nitroprusside, as a nitric oxide donor, and potassium silicate, as a source of silicon and potassium, play important roles in plant tolerance to stress. In this study, the effect of foliar application of sodium nitroprusside and potassium silicate on growth indices and antioxidant activity of the medicinal plant rosemary (Rosmarinus officinalis L.) under different levels of drought stress was investigated. The experiment was conducted as a factorial completely randomized design with three replications in a commercial greenhouse located in Karaj, Iran. The treatments included water deficit levels (control, 30%, and 70% of field capacity) and foliar application of sodium nitroprusside (0, 25, 50, and 100 µM) and potassium silicate (0, 25, 50, and 100 mg/L), along with their interactions. Deficit irrigation was applied using the gravimetric method, and foliar spraying with sodium nitroprusside and potassium silicate was conducted three times every other day. The results showed that drought stress significantly reduced growth traits and antioxidant activity while increasing ion leakage and proline accumulation. In contrast, the application of sodium nitroprusside and potassium silicate significantly reduced the harmful effects of stress by enhancing the antioxidant defense system. The highest fresh and dry weight of shoots, fresh and dry weight of roots, phenol content, and activities of catalase, superoxide dismutase, and peroxidase enzymes were observed in the treatment with 100% field capacity + 50 µM sodium nitroprusside. The most significant root length, root volume, plant height, total chlorophyll content, flavonoid content, and protein content were obtained in the treatment with 100% field capacity + 100 mg/L potassium silicate. The highest percentage of cell membrane ion leakage and proline content were recorded in the 30% field capacity treatment. Overall, the results of this study indicate that the application of sodium nitroprusside and potassium silicate can be used as a strategy to increase the tolerance of rosemary (Rosmarinus officinalis L.) to drought and maintain its yield and quality under water-limited conditions.
Article number: 11
Type of Study: Research |
Subject:
Droughts Stress
Received: 2025/10/14 | Accepted: 2026/02/3 | Published: 2026/06/2
Received: 2025/10/14 | Accepted: 2026/02/3 | Published: 2026/06/2
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