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. 2018 Jul 3;9:914. doi: 10.3389/fpls.2018.00914

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Copyright © 2018 Ke, Ye, Wang, Ren, Yin, Deng and Wang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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A proposed model illustrating the roles of exogenous melatonin in regulating polyamine metabolism in response to salt stress. Exogenous melatonin induces the biosynthesis of endogenous melatonin. Increased melatonin further accelerated the metabolic flow from the precursors amino acids arginine and methionine to polyamines; melatonin also decreased the degradation of salt-induced polyamines by suppressing the polyamine oxidase (PAO) and diamine oxidase (DAO) activities. Increased PAs further improve tolerance to abiotic stress in wheat seedlings. Abs, Amino butanals.