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首页> 外文期刊>Agricultural Water Management >Melatonin reduces oxidative stress and promotes drought tolerance in young Coffea arabica L. plants
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Melatonin reduces oxidative stress and promotes drought tolerance in young Coffea arabica L. plants

机译：褪黑激素可减少氧化应激，促进年轻咖啡阿拉伯植物的耐旱性耐受性

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摘要

Water deficit severely compromises the homeostatic balance of plants and suggests a redox imbalance in cells. Melatonin is described as a promoter of stress tolerance in plants that induces the expression of stress-related genes, reduces lipid peroxidation and increases the antioxidant system. To analyze the influence of exogenous melatonin on the promotion of tolerance to water deficit, we applied concentrations of 300 mu M and 500 mu M to Coffea arabica L seedlings. Here, we show that the intensity of the short-term responses to melatonin may vary according to the concentration of melatonin. We also report that lower concentrations of melatonin (300 mu M) promote an increase in the root system and the protection of the photosynthetic apparatus, allowing greater gas exchange, greater carboxylation efficiency and higher chlorophyll contents. Moreover, melatonin improved the activity of the enzymatic and nonenzymatic antioxidant systems and reduced lipid peroxidation. In addition, we demonstrated that higher concentrations (500 mu M) caused negative effects on stress tolerance, thus demonstrating a toxic level. Overall, these results demonstrated that melatonin mediates the signaling for water deficit responses by acting as an inductor of tolerance, most likely enhanced by increased carboxylation efficiency and antioxidant systems. This study provides evidence that exogenous melatonin protects coffee against water deficit.
机译：水赤字严重损害植物的稳态平衡，并表明细胞中的氧化还原性失衡。褪黑激素被描述为诱导应激相关基因表达的植物中应激耐受性的启动子，降低脂质过氧化并增加抗氧化体系。分析外源褪黑素对水赤字耐受性的影响，我们应用300亩和500亩m〜咖啡阿拉伯幼苗的浓度。在这里，我们表明对褪黑素的短期反应的强度可以根据褪黑素的浓度而变化。我们还报告说，较低浓度的褪黑激素（300μm）促进根系的增加和光合仪的保护，允许更大的气体交换，更高的羧化效率和更高的叶绿素含量。此外，褪黑激素改善了酶促和非酶抗氧化体系的活性并降低了脂质过氧化。此外，我们证明较高浓度（500μm）对应力耐受引起的负面影响，从而展示毒性水平。总体而言，这些结果表明，褪黑素通过作为耐受性的电感而介导水缺损反应的信号传导，最可能通过增加的羧化效率和抗氧化系统增强。本研究提供了证据表明外源褪黑激素保护咖啡免受水赤字。

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