Melatonin: A Potential Agent in Delaying Leaf Senescence

IF 6 2区 生物学 Q1 PLANT SCIENCES Critical Reviews in Plant Sciences Pub Date : 2021-01-02 DOI:10.1080/07352689.2020.1865637
Yuqing Zhao, Zhong-wei Zhang, Yanger Chen, C. Ding, S. Yuan, R. Reiter, M. Yuan
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引用次数: 28

Abstract

Abstract Delaying early leaf senescence is important for improving photosynthetic efficiency and crop productivity. Melatonin, a multitasking bio-stimulator, participates widely in plant development and stress responses. In recent years, the cumulative researches show that melatonin has the ability to delay senescence in plants. This review covers the most recent advances on the mechanisms of melatonin-mediated leaf senescence. Melatonin biosynthesis in senescing leaves employs an alternative pathway and is significantly regulated by light. Melatonin increases the thickness of leaf cuticle, wax accumulation and the ratio of palisade/spongy of senescing leaves to maintain intact leaf structure. Melatonin eliminates free radicals through a scavenging cascade reaction and induces antioxidants and antioxidant enzymes; and provides better protection against lipid peroxidation via arranging parallel to the bilayers at high concentration. Meanwhile, melatonin’s ability to ensure high photosynthetic efficiency is predominantly attributed to the reduction of chlorophylls and chloroplast proteins degradation, and the acceleration of chlorophyll de novo synthesis. The dual role of melatonin-regulated autophagy is beneficial for maintaining cellular homeostasis. NACs, WRKYs and DREBs play essential roles in melatonin-controlled transcriptional reprogramming of senescing leaves. Additionally, melatonin improves the activity of cytokinin and auxin; and inhibits the action of abscisic acid, ethylene and jasmonic acid to impact indirectly leaf senescence. Epigenetic modification may be part of mechanisms of melatonin-mediated alterations in gene expression. Moreover, selection of germplasms rich in melatonin and application of genetic modification in agriculture are extensively discussed. Further studies are needed to detail the mechanisms of melatonin-mediated signaling transduction in leaf senescence.
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褪黑素:延缓叶片衰老的潜在药物
摘要延缓叶片早衰对提高光合效率和作物生产力具有重要意义。褪黑激素是一种多任务生物刺激剂,广泛参与植物发育和应激反应。近年来,越来越多的研究表明褪黑素具有延缓植物衰老的作用。本文综述了褪黑激素介导的叶片衰老机制的最新进展。衰老叶片中褪黑激素的生物合成采用了另一种途径,并受到光的显著调节。褪黑激素增加衰老叶片角质层厚度、蜡质积累和栅栏/海绵比例,以保持叶片结构的完整。褪黑素通过清除级联反应消除自由基,并诱导抗氧化剂和抗氧化酶;并且通过在高浓度下平行于双层布置来提供对脂质过氧化的更好的保护。同时,褪黑激素确保高光合效率的能力主要归因于叶绿素和叶绿体蛋白降解的减少,以及叶绿素从头合成的加速。褪黑激素调节的自噬的双重作用有利于维持细胞稳态。NACs、WRKYs和DREBs在褪黑激素控制的衰老叶片转录重编程中发挥重要作用。此外,褪黑激素还能提高细胞分裂素和生长素的活性;并抑制脱落酸、乙烯和茉莉酸对叶片衰老的间接影响。表观遗传学修饰可能是褪黑激素介导的基因表达改变机制的一部分。此外,还对富含褪黑激素的种质的筛选和遗传修饰在农业中的应用进行了广泛的讨论。需要进一步的研究来详细说明褪黑激素介导的信号转导在叶片衰老中的机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
12.90
自引率
1.40%
发文量
15
审稿时长
>12 weeks
期刊介绍: Critical Reviews in Plant Sciences focuses on presenting in-depth and up-to-date reviews of timely and/or cutting-edge subjects in the broad discipline of plant science, ranging from molecular biology/biochemistry through the areas of cell biology, plant pathology and physiology, genetics, classical botany, and ecology, to practical agricultural applications. Articles in the journal provide an up-to-date literature base for researchers and students, pointing the way towards future research needs. The journal is also a significant source of credible, objective information to aid decision makers at all levels.
期刊最新文献
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