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首页> 外文期刊>Physiologia plantarum >Exogenous melatonin enhances salt stress tolerance in maize seedlings by improving antioxidant and photosynthetic capacity
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Exogenous melatonin enhances salt stress tolerance in maize seedlings by improving antioxidant and photosynthetic capacity

机译：通过改善抗氧化和光合能力，外源褪黑素增强玉米幼苗的盐胁迫耐受性

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摘要

Melatonin (N‐acetyl‐5‐methoxytryptamine) is an important biological hormone in many abiotic stress responses and developmental processes. In this study, the protective roles of melatonin were investigated by measuring the antioxidant defense system and photosynthetic characteristics in maize under salt stress. The results indicated that NaCl treatment led to the decrease in plant growth, chlorophyll contents and photochemical activity of photosystem II (PSII). However, the levels of reactive oxygen species increased significantly under salt stress. Meanwhile, we found that application of exogenous melatonin alleviated reactive oxygen species burst and protected the photosynthetic activity in maize seedlings under salt stress through the activation of antioxidant enzymes. In addition, 100?μM melatonin‐treated plants showed high photosynthetic efficiency and salinity. Immunoblotting analysis of PSII proteins showed that melatonin application alleviated the decline of 34?kDa PSII reaction center protein (D1) and the increase of PSII subunit S protein. Taken together, our study promotes more comprehensive understanding in the protective effects of exogenous melatonin in maize under salt stress, and it may be involved in activation of antioxidant enzymes and regulation of PSII proteins.
机译：褪黑激素（N-乙酰基-5-甲氧基 - 羟基胺）是许多非生物应激反应和发育过程中的重要生物激素。在这项研究中，通过测量盐胁迫下玉米的抗氧化防御系统和光合特性来研究褪黑激素的保护作用。结果表明，NaCl治疗导致植物生长，叶绿素含量和光学系统II（PSII）的光化学活性降低。然而，在盐胁迫下，活性氧物种的水平显着增加。同时，我们发现外源褪黑激素缓解的反应性氧物质的应用突破并保护盐胁迫下玉米幼苗的光合活性通过抗氧化酶的激活。此外，100？μm褪黑激素处理的植物显示出高光合效率和盐度。 PSII蛋白的免疫印迹分析表明，褪黑素应用缓解了34？KDA PSII反应中心蛋白（D1）的下降和PSII亚基S蛋白的增加。在一起，我们的研究促进了在盐胁迫下外源褪黑素在玉米中的保护作用中的更全面的理解，并且可能参与激活抗氧化酶和PSII蛋白的调节。

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  • 来源
    《Physiologia plantarum》 |2018年第3期|共15页
  • 作者

    Chen Yang‐Er; Mao Jing‐Jing; Sun Liang‐Qi; Huang Bo; Ding Chun‐Bang; Gu Yu; Liao Jin‐Qiu; Hu Chao; Zhang Zhong‐Wei; Yuan Shu; Yuan Ming;

  • 作者单位

    College of Life SciencesSichuan Agricultural UniversityYa'an 625014 China;

    College of Life SciencesSichuan Agricultural UniversityYa'an 625014 China;

    College of Life SciencesSichuan Agricultural UniversityYa'an 625014 China;

    College of Life SciencesSichuan Agricultural UniversityYa'an 625014 China;

    College of Life SciencesSichuan Agricultural UniversityYa'an 625014 China;

    College of Life SciencesSichuan Agricultural UniversityYa'an 625014 China;

    College of Life SciencesSichuan Agricultural UniversityYa'an 625014 China;

    College of Life SciencesSichuan Agricultural UniversityYa'an 625014 China;

    College of Resources Science and TechnologySichuan Agricultural UniversityChengdu 611130 China;

    College of Resources Science and TechnologySichuan Agricultural UniversityChengdu 611130 China;

    College of Life SciencesSichuan Agricultural UniversityYa'an 625014 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物生理学;
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