Volume 16, Issue 3 (Journal of Soil and Plant Interactions 2025)
2025, 16(3): 23-38 |
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1- Department of Horticulture, Ga.C., Islamic Azad University, Garmsar, Iran
2- Department of Horticulture, Ga.C., Islamic Azad University, Garmsar, Iran ,e.danaee@iau-garmsar.ac.ir
2- Department of Horticulture, Ga.C., Islamic Azad University, Garmsar, Iran ,
Abstract: (642 Views)
Background and Objective: African marigold (Tagetes erecta L.) is an annual plant belonging to the Asteraceae family, with ornamental, medicinal, and industrial applications. Water deficit is one of the key factors affecting the quantity and quality of plants. In this context, the use of plant growth stimulators such as amino acids can be beneficial for plants under drought stress. Therefore, the present study aimed to evaluate the effects of foliar application of amino acids arginine, ornithine, and proline on the growth and flowering traits of African marigold under water deficit stress.
Methods: This factorial experiment included water stress consisting of control (no stress), 70%, and 30% of field capacity and foliar application of arginine, ornithine, and proline at three levels (0, 50, and 100 mg L⁻¹), arranged in a completely randomized design with three replications. Water deficit stress was imposed at the 6–8 leaf stage. Foliar applications of amino acids were performed in two stages: the first at the 6-leaf stage, and the second two weeks after the first application. Sampling was conducted at full flowering stage.
Results: The highest fresh and dry weights of aerial parts, flower number, protein content, and flower longevity on the plant were observed under 100% field capacity combined with 100 mg L⁻¹ ornithine. The greatest fresh and dry root weights, longest root length, and activities of catalase, superoxide dismutase, and peroxidase enzymes were recorded under 100% field capacity combined with 100 mg L⁻¹ proline. The tallest plants, highest total chlorophyll content, and carotenoid levels were observed under 100% field capacity combined with 100 mg L⁻¹ arginine. Additionally, the highest membrane ion leakage and proline content were recorded under 30% field capacity.
Conclusion: Based on the results, foliar application of arginine, ornithine, and proline at 100 mg L⁻¹ can effectively mitigate the negative effects of drought stress in African marigold.
Methods: This factorial experiment included water stress consisting of control (no stress), 70%, and 30% of field capacity and foliar application of arginine, ornithine, and proline at three levels (0, 50, and 100 mg L⁻¹), arranged in a completely randomized design with three replications. Water deficit stress was imposed at the 6–8 leaf stage. Foliar applications of amino acids were performed in two stages: the first at the 6-leaf stage, and the second two weeks after the first application. Sampling was conducted at full flowering stage.
Results: The highest fresh and dry weights of aerial parts, flower number, protein content, and flower longevity on the plant were observed under 100% field capacity combined with 100 mg L⁻¹ ornithine. The greatest fresh and dry root weights, longest root length, and activities of catalase, superoxide dismutase, and peroxidase enzymes were recorded under 100% field capacity combined with 100 mg L⁻¹ proline. The tallest plants, highest total chlorophyll content, and carotenoid levels were observed under 100% field capacity combined with 100 mg L⁻¹ arginine. Additionally, the highest membrane ion leakage and proline content were recorded under 30% field capacity.
Conclusion: Based on the results, foliar application of arginine, ornithine, and proline at 100 mg L⁻¹ can effectively mitigate the negative effects of drought stress in African marigold.
Type of Study: Research |
Subject:
Plant growth under stressful conditions
Received: 2025/06/29 | Accepted: 2025/08/25 | Published: 2025/09/22
Received: 2025/06/29 | Accepted: 2025/08/25 | Published: 2025/09/22
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Journal of Soil and Plant Interactions by http://jspi.iut.ac.ir is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.
This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.
