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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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Effects of exogenous melatonin on polyamine metabolism under salt stress. (A) Cellular polyamine including putrescine, spermidine (Spd) and spermine (Spe), (B) two polyamine precursor amino acids, arginine (Arg) and methionine (Met), and (C) the activity of polyamine oxidase (PAO) and diamine oxidase (DAO) were measured in wheat seedlings pretreated with or without 1 μM melatonin under control and salt stress (100 mM NaCl) conditions for 16 days. Data represent the mean ± SE of three biological repeats; different lowercase letters above the bars indicating significant differences at P < 0.05 according to Duncan’s multiple range tests.