Melatonin acts as a growth-stimulating compound in some monocot species
Melatonin acts as a growth-stimulating compound in some monocot species
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DOI：
10.1111/j.1600-079x.2005.00226.x
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发表时间：
2005-09-01
影响因子：
10.3
通讯作者：
Arnao, MB
中科院分区：
文献类型：
--
作者：
Hernández-Ruiz, J;Cano, A;Arnao, MB
在最近的一项研究中，褪黑激素（N-乙酰基-5-甲氧基色胺）是一种经过充分研究的动物分子，但在植物中的研究很少，它被认为在羽扇豆下胚轴中具有作为生长促进分子的生理作用。在本研究中，褪黑素作为生长促进剂的作用扩展到金丝雀草、小麦、大麦和燕麦的胚芽鞘，其中它显示出10%至55%的相对生长素活性[相对于吲哚-3-乙酸(IAA)，植物中的主要生长素]。此外，褪黑素被认为对根部具有重要的抑制生长作用，类似于生长素的作用。对单子叶植物黄化的胚芽鞘中褪黑素和 IAA 的电化学检测和串联质谱鉴定的液相色谱定量表明，这两种化合物在这些组织中以相似的水平存在。这些结果表明生长素和褪黑素在组织中共存，并提出了它们作为植物生长素激素共同参与某些生理作用的可能性。
In a recent study melatonin (N-acetyl-5-methoxytryptamine), a well-investigated animal molecule but minimally studied in plants, was seen to have a physiological role as growth-promoting molecule in lupin hypocotyls. In the present study, the role of melatonin as a growth promoter is extended to coleoptiles of canary grass, wheat, barley and oat, in which it shows a relative auxinic activity [with respect to indole-3-acetic acid (IAA), the main auxin in plants] of between 10 and 55%. In addition, melatonin is seen to have an important inhibitory growth effect on roots similar to that played by auxin. The quantitation by liquid chromatography with electrochemical detection and identification by tandem mass spectrometry of melatonin and IAA in etiolated coleoptiles of the monocots assayed showed that both compounds are present in similar levels in these tissues. These results point to the co-existence of auxin and melatonin in tissues and raises the possibility of their co-participation in some physiological actions as auxinic hormones in plants.