Melatonin may exert a protective role against drought stress in maize
Melatonin may exert a protective role against drought stress in maize
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DOI：
10.1111/jac.12201
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发表时间：
2017-08-01
影响因子：
3.5
通讯作者：
Munne-Bosch, S.
中科院分区：
文献类型：
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作者：
Fleta-Soriano, E.;Diaz, L.;Munne-Bosch, S.
褪黑激素（N-乙酰基-5-甲氧色胺）是一种两亲性低分子量化合物，存在于从细菌到哺乳动物等进化遥远的生物体中。它可以由植物合成，并作为一种有效的抗氧化剂和/或植物生长和发育的调节剂。在这里，我们研究了褪黑激素在植物响应干旱胁迫和恢复玉米（玉米L。）本报告还介绍了对植物的光保护作用和抗氧化作用，以及与胁迫相关的植物激素脱落酸、水杨酸和茉莉酸的信号传递功能。结果表明，褪黑激素和光保护的内源性含量之间的正相关性，所示的光系统II光化学的最大效率（Fv/Fm比），这是进一步证实了外源褪黑激素在恢复过程中从干旱胁迫。褪黑激素在干旱恢复过程中的应用改善了暴露于随后的干旱胁迫的玉米植株的Fv/Fm比。此外，内源性褪黑激素的含量呈正相关，与压力相关的植物激素，特别是与水杨酸，虽然外源性应用褪黑激素没有改变这些防御化合物的内容。因此，褪黑激素可以发挥防御作用，在玉米植株暴露于干旱胁迫，特别是提高光系统II光化学的效率。
Melatonin (N-acetyl-5methoxytryptamine) is an amphiphilic low-molecular-weight compound found in evolutionary distant living organisms, from bacteria to mammals. It can be synthesized by plants and acts as a potent antioxidant and/or a regulator of plant growth and development. Here, we investigated the role of melatonin in plant response to drought stress and recovery in maize (Zea mays L.) plants, with an emphasis on its possible photoprotective and antioxidant role and/or signalling function in relation to the stress-related phytohormones, abscisic acid, salicylic acid and jasmonic acid. Results show a positive correlation between endogenous contents of melatonin and photoprotection, as indicated by the maximum efficiency of photosystem II photochemistry (Fv/Fm ratio), which was confirmed further by exogenous application of melatonin during recovery from drought stress. Melatonin applications during drought recovery improved the Fv/Fm ratio in maize plants exposed to a subsequent drought stress. Furthermore, endogenous contents of melatonin positively correlated with those of stress-related phytohormones, particularly with those of salicylic acid, although exogenous application of melatonin did not alter the contents of these defence compounds. It is concluded that melatonin can exert a defensive role in maize plants exposed to drought stress, particularly improving the efficiency of photosystem II photochemistry.