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Exogenous melatonin enhances drought tolerance and germination in common buckwheat seeds through the coordinated effects of antioxidant and osmotic regulation

文献类型： 外文期刊

作者： Tian, Zemiao 1 ; He, Jiadong 3 ; Wang, Zhanyu 1 ; Zhang, Zhuo 4 ; Quinet, Muriel 5 ; Meng, Yu 1 ;

作者机构： 1.Hebei Agr Univ, Country Coll Landscape Architecture & Tourism, Baoding 071001, Peoples R China

2.Chinese Acad Agr Sci, Inst Crop Sci, Beijing, Peoples R China

3.Univ Catholique Louvain UCLouvain, Earth & Life Inst, Lab Mycol, B-1348 Louvain La Neuve, Belgium

4.Univ Catholique Louvain UCLouvain, Louvain Inst Biomol Sci & Technol, B-1348 Louvain La Neuve, Belgium

5.Univ Catholique Louvain UCLouvain, Earth & Life Inst, Grp Rech Physiol Vegetale, B-1348 Louvain La Neuve, Belgium

关键词： Antioxidant enzymes; Buckwheat germination; Drought stress; Melatonin; Osmotic regulation; Rutin

期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.8； 五年影响因子：5.4 ）

ISSN： 1471-2229

年卷期： 2025 年 25 卷 1 期

页码：

收录情况： SCI

摘要： BackgroundDrought stress is a major constraint on seed germination and crop productivity, particularly for drought-sensitive crops like common buckwheat (Fagopyrum esculentum). Exogenous melatonin has emerged as a promising strategy to mitigate drought stress by enhancing plant physiological and biochemical responses. However, its specific roles in regulating antioxidant defenses, osmotic adjustment, and plant compounds biosynthesis during buckwheat seed germination under drought stress remain poorly understood.ResultsThis study investigated the effects of 200 mu M exogenous melatonin on common buckwheat germination under polyethylene glycol (PEG-6000)-induced drought stress. Melatonin significantly improved germination rates and radicle growth, reduced membrane damage, and enhanced osmotic regulation by increasing proline, soluble sugars, and proteins. Antioxidant enzyme activities (catalase, peroxidase, and superoxide dismutase) and associated gene expression (FtCAT, FtPOD, FtSOD) were markedly upregulated. Molecular docking and dynamics simulations revealed a stable interaction between rutin, a secondary metabolite, and catalase, suggesting enhanced enzyme stabilization. Additionally, melatonin increased rutin and methyl jasmonate synthesis, which contributed to antioxidant defenses and reduced oxidative damage. The coordinated effects of melatonin improved drought tolerance in buckwheat seeds by optimizing osmotic balance, strengthening antioxidant capacity, and stabilizing cellular structures.ConclusionsExogenous melatonin enhances drought tolerance in common buckwheat seeds through the coordinated regulation of antioxidant defenses, osmotic adjustment, and plant compounds production, including methyl jasmonate and rutin, during germination. These findings offer valuable insights for developing practical strategies to improve drought resilience and crop establishment in sensitive agricultural species under water-limited conditions.

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