Zeitschrift für Gartenbau
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Abstrakt

Foliar Application of Jasmonic and Salicylic Acid on Garden Thyme under Drought Stress Conditions

Z Karimi, M Nasri, P Kasraei, M Oveysi, HR Larijani

Background and objectives: This research was conducted to investigate the effect of foliar application of different levels of salicylic acid and jasmonic acid on the morphological, physiological, and biochemical characteristics of garden thyme under water deficit stress conditions with evaporation pans. This research was conducted as split factorial based on a randomized complete block design with three factors with three replications at the Varamin research field in during the 2019 crop year.

Method: The main treatment includes irrigation levels: Irrigation was applied after 60 mm and 110 mm of evaporation from the class A evaporation pan, respectively, as normal irrigation and water deficit stress. And the sub factor includes foliar application treatment with different levels of salicylic acid and jasmonic acid was performed as factorial in random complete block design with three replications. Foliar application levels of salicylic acid at three levels: Control (zero), 25 mg/lit, and 50 mg/lit. Foliar spraying levels of jasmonic acid at three levels: Control (zero), 1 mg/lit and 2 mg/lit.

Finding: The results showed that drought stress had a significant decrease in plant height, fresh and dry weight yield components, chlorophyll a, b, and total chlorophyll content, and increased the amount of proline. Also, the interaction of the foliar application with different levels of salicylic acid and jasmonic acid reduced the destructive effects of drought stress and increased the tolerance of garden thyme medicinal plant. The highest and lowest plant heights, dry weight of shoot, and total chlorophyll were obtained from the treatments of (S₀^*SA₂^*JA₂) and (S₁^*SA₀^*JA₀), respectively. The comparison table of the average of the three effects showed that a significant difference was obtained from treatments of the highest and lowest percentage of shoot essential oil, proline and Ec observed (S₁^*SA₂^*JA₂) and (S₀^*SA₁^*JA₀), respectively.

Conclusion: In fact, it can be said that these substances indirectly reduced the activity of these enzymes and improved plant growth conditions.