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. 2019 Feb 1;10:44. doi: 10.3389/fpls.2019.00044

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Copyright © 2019 Zhang, Liu, Zhang, Liu, Li and Hu.

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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Effect of waterlogging (WL) and exogenous melatonin (MT) pretreatment on ADC (A), ornithine decarboxylase (ODC, B) and S-adenosylmethionine decarboxylase (SAMDC, C) activity in leaves of alfalfa plants. 45-day-old alfalfa plants pretreated with 100 μM melatonin and then exposed to 10 days of waterlogging stress. CK-MT, control without melatonin pretreatment; CK+MT, control with melatonin pretreatment; WL-MT, waterlogging without melatonin pretreatment; WL+MT, waterlogging with melatonin pretreatment. Data are expressed as mean ± SE of four replications. Letters marked by the same letters are not significant at P < 0.05 (Ducan’s multiple range test).