Document Type : Research Paper
Authors
1
Department of Plant production and Genetics, Faculty of Agriculture, university of maragheh
2
2. Ph.D. Graduate in Agrotechnology, Crop Ecology, Faculty of Agriculture, University of Maragheh, East Azerbaijan, Iran; sara73re@gmail.com
3
3. Ph.D. student in Agrotechnology, Crop Ecology, Faculty of Agriculture, University of Maragheh, East Azerbaijan, Iran; shabkhizhaniyeh@gmailcom
4
1. Professor, Department of Plant Production and Genetics, Faculty of Agriculture, University of Maragheh, East Azerbaijan, Iran
10.22034/saps.2025.69204.3403
Abstract
a study was conducted at the research field of the Department of Production Engineering and Plant Genetics, Faculty of Agriculture, University of Maragheh using the Response Surface Method (RSM). The factors included different irrigation levels based on field capacity (75, 65, 50, 35, and 25 % FC), concentration of melatonin (0, 70, 155, 240, and 300 mM), and methyl jasmonate (0, 50, 110, 170, and 210 μM).
Results: The results showed that drought stress significantly reduced the dry weight of grapefruit mint. Also, the nonlinear effects of melatonin and methyl jasmonate on dry weight, proline, phenol, flavonoid, essential oil content and fluorescence indices were significant. The essential oil content was 0.16 percentage in irrgation of 75% FC. As the water stress trend continued, the content of essential oil increased, reaching 225, 518.75, and 400% under irrigation of 65, 50, and 35% FC, respectively. In addition, with increasing stress levels, the F0 content at the levels of 75, 65, 50, 35 and 25% of field capacity was 0.96, 0.88, 0.91, 1.12 and 1.35%, respectively, which indicated that the F0 content increased with increasing drought stress. Also, with increasing drought stress levels, the maximum fluorescence (Fm) of grapefruit mint leaves decreased significantly. The highest and lowest Fm were recorded at 75% and 25% of field capacity. In addition, with increasing concentration of melatonin, the Fm decreased. In addition, the amount of variable fluorescence (Fv) decreased with increasing stress levels, such that the highest Fv was observed at 75% FC.
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