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    Oxalic Acid’s Impact on the Morphological, Physiological and Biochemical Characteristics of Marigolds under Drought Stress
    (Düzce Üniversitesi, 2024) Kılıç, Tuğba; Doğan Meral, Ezgi; Kırbay, Emine; Dursun, Hilal; Kazaz, Soner
    Due to global climate change, it has become a great necessity to prefer drought-resistant/tolerant species in plant design and to increase plant tolerance. Organic acids can improve plant tolerance to abiotic stress. However, the effectiveness of oxalic acid on seasonal flowers under stress conditions is not fully understood. In this study, the effects of oxalic acid treatment on the morphological, physiological and biochemical characteristics of marigolds under drought stress were investigated. F1 seeds of Tagetes erecta L. 'Bali Orange' variety were used and oxalic acid solution at concentrations of 1 mM, 3 mM and 5 mM was applied by foliar spraying at the seedling stage. Then, the seedlings were kept at 100% (well-watered) and 40% field capacity (limited watering) conditions. The experiment was terminated when drought symptoms were observed in more than 50% of the limited watering plants that had not been treated with oxalic acid. MDA, chlorophyll and proline content, leaf area, flower diameter, plant height, leaf relative water content, membrane damage index parameters were examined. Drought stress generally negatively affected the morphological, physiological and biochemical characteristics of marigolds. On the other hand, oxalic acid treatments improved the physiological and biochemical characteristics of marigolds, reduced the negative effects of drought stress on the morphological characteristics of flowers and enhanced drought stress tolerance. The results showed that oxalic acid has the potential to improve the stress tolerance of seasonal flowers for landscaping.