Moustafa-Farag Mohamed, Mahmoud Ahmed, Arnao Marino B, Sheteiwy Mohamed S, Dafea Mohamed, Soltan Mahmoud, Elkelish Amr, Hasanuzzaman Mirza, Ai Shaoying
Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China.
Horticulture Research Institute, Agriculture Research Center, 9 Gmaa St, Giza 12619, Egypt.
Antioxidants (Basel). 2020 Sep 1;9(9):809. doi: 10.3390/antiox9090809.
Water stress (drought and waterlogging) is severe abiotic stress to plant growth and development. Melatonin, a bioactive plant hormone, has been widely tested in drought situations in diverse plant species, while few studies on the role of melatonin in waterlogging stress conditions have been published. In the current review, we analyze the biostimulatory functions of melatonin on plants under both drought and waterlogging stresses. Melatonin controls the levels of reactive oxygen and nitrogen species and positively changes the molecular defense to improve plant tolerance against water stress. Moreover, the crosstalk of melatonin and other phytohormones is a key element of plant survival under drought stress, while this relationship needs further investigation under waterlogging stress. In this review, we draw the complete story of water stress on both sides-drought and waterlogging-through discussing the previous critical studies under both conditions. Moreover, we suggest several research directions, especially for waterlogging, which remains a big and vague piece of the melatonin and water stress puzzle.
水分胁迫（干旱和涝害）是影响植物生长发育的严重非生物胁迫。褪黑素作为一种具有生物活性的植物激素，已在多种植物的干旱环境中得到广泛测试，而关于褪黑素在涝害胁迫条件下作用的研究报道较少。在本综述中，我们分析了褪黑素在干旱和涝害胁迫下对植物的生物刺激作用。褪黑素可控制活性氧和活性氮的水平，并积极改变分子防御机制，以提高植物对水分胁迫的耐受性。此外，褪黑素与其他植物激素的相互作用是植物在干旱胁迫下存活的关键因素，而这种关系在涝害胁迫下还需要进一步研究。在本综述中，我们通过讨论此前在这两种条件下的关键研究，全面阐述了干旱和涝害这两种水分胁迫情况。此外，我们提出了几个研究方向，特别是针对涝害方面，这在褪黑素与水分胁迫的难题中仍是一个庞大且模糊的部分。
