Exogenous Melatonin Improves Tolerance to Water Deficit by Promoting Cuticle Formation in Tomato Plants.
Exogenous Melatonin Improves Tolerance to Water Deficit by Promoting Cuticle Formation in Tomato Plants.
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DOI：
10.3390/molecules23071605
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发表时间：
2018-07-02
期刊：
影响因子：
--
通讯作者：
Zhang S
中科院分区：
文献类型：
--
作者：
Ding F;Wang G;Wang M;Zhang S
植物角质层由角质和蜡质组成，是覆盖在陆生植物地上器官上的疏水层，在限制水分流失方面起着关键作用。虽然褪黑激素最近已被证明参与植物对干旱胁迫的反应，但其与角质层形成的关系尚不清楚。本文报道了褪黑激素对水分亏缺条件下番茄叶片角质层形成的影响。通过光学显微镜初步分析表明，在水分亏缺条件下，外源褪黑激素处理的番茄叶片角质层可能比未处理的番茄叶片更厚。化学特性表明，外源褪黑激素的施用增加了水分亏缺下番茄叶片表皮蜡质的水平。与表皮蜡质变化一致的是蜡质相关基因转录物的丰度增加。此外，番茄叶片中水分损失和叶绿素浸出的评估揭示了角质层沉积与叶片渗透性降低的关联，这在限制水分亏缺胁迫的番茄植物中的水分损失方面是重要的。这些结果表明，褪黑激素在调节叶片角质层的形成和非气孔失水的作用。
The plant cuticle, composed of cutin and waxes, is a hydrophobic layer coating the aerial organs of terrestrial plants and playing a critical role in limiting water loss. While melatonin has been recently demonstrated to be involved in responses to drought stress in plants, its relationship with cuticle formation is not known. In the present work, we report the effects of melatonin on the formation of cuticle in tomato leaves subjected to water deficit. Preliminary analysis by light microscope showed that tomato leaves pretreated with exogenous melatonin might have thicker cutin than tomato leaves without melatonin pretreatment under water deficit condition. Chemical characterization showed that exogenous application of melatonin increased the level of cuticular waxes in tomato leaves under water deficit. Consistent with the change in cuticular waxes was the increased abundance of wax-associated gene transcripts. Further, assessment of water loss and chlorophyll leaching in tomato leaves revealed the association of cuticle deposition with reduced leaf permeability, which is important in restricting water loss in water deficit-stressed tomato plants. These results suggest a role for melatonin in regulating leaf cuticle formation and non-stomatal water loss in leaves.
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影响因子：
10.3
作者：
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