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Melatonin may exert a protective role against drought stress in maize

机译:褪黑素可能对玉米干旱胁迫产生保护作用

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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.
机译:褪黑素(N-乙酰-5-乙氧基色胺)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的远古生物中。它可以由植物合成,并作为一种有效的抗氧化剂和/或植物生长发育的调节器。在这里,我们研究了褪黑素在玉米(Zea mays L.)植物对干旱胁迫的反应和恢复中的作用,重点是其可能的光保护和抗氧化作用和/或与胁迫相关的植物激素、脱落酸、水杨酸和茉莉酸有关的信号传递功能。结果表明,内源性褪黑素含量与光保护呈正相关,光系统II光化学的最大效率(Fv/Fm比)表明了这一点,这一点在干旱胁迫恢复期间外源性应用褪黑素进一步证实。在干旱恢复期间施用褪黑素提高了暴露于随后干旱胁迫的玉米植株的Fv/Fm比率。此外,内源性褪黑素的含量与应激相关植物激素的含量呈正相关,尤其是与水杨酸的含量呈正相关,尽管外源性应用褪黑素不会改变这些防御化合物的含量。因此,褪黑素可以在干旱胁迫下对玉米植株发挥防御作用,尤其是提高光系统II光化学的效率。

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