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首页> 外文期刊>Journal of Experimental Botany >Melatonin mediates the regulation of ABA metabolism, free-radical scavenging, and stomatal behaviour in two Malus species under drought stress
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Melatonin mediates the regulation of ABA metabolism, free-radical scavenging, and stomatal behaviour in two Malus species under drought stress

机译：褪黑素介导干旱胁迫下两种海棠属ABA代谢，自由基清除和气孔行为的调节

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摘要

Melatonin pre-treatment significantly increases the tolerance of both drought-tolerant Malus prunifolia and drought-sensitive M. hupehensis plants. Its beneficial effects include better water conservation in leaves, less electrolyte leakage, steady chlorophyll contents, and greater photosynthetic performance under stress conditions. Melatonin selectively down-regulates MdNCED3, an abscisic acid (ABA) synthesis gene, and up-regulates its catabolic genes, MdCYP707A1 and MdCYP707A2, thereby reducing ABA contents in drought-stressed plants. Melatonin also directly scavenges H2O2 and enhances the activities of antioxidant enzymes to detoxify H2O2 indirectly. These two mechanisms work synergistically to improve the functions of stomata, i.e. causing them to re-open. Plants can effectively regulate their water balance under drought conditions by up-regulating the expression of melatonin synthesis genes MdTDC1, MdAANAT2, MdT5H4, and MdASMT1. Therefore, inducing melatonin production is an important mechanism by which plants can counteract the influence of this abiotic stressor.
机译：褪黑素预处理显着提高了耐旱的锦葵和干旱敏感的平邑甜茶植物的耐受性。它的有益作用包括更好的叶片水分保护，更少的电解质泄漏，稳定的叶绿素含量以及在胁迫条件下更高的光合作用性能。褪黑素选择性下调脱落酸（ABA）合成基因MdNCED3，并上调其分解代谢基因MdCYP707A1和MdCYP707A2，从而减少干旱胁迫植物中的ABA含量。褪黑激素还可以直接清除H2O2，并增强抗氧化酶的活性，从而间接地使H2O2解毒。这两种机制协同工作以改善气孔的功能，即使它们重新打开。植物可以通过上调褪黑激素合成基因MdTDC1，MdAANAT2，MdT5H4和MdASMT1的表达来有效调节干旱条件下的水分平衡。因此，诱导褪黑激素的产生是植物抵制这种非生物胁迫源的重要机制。

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