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. 2019 Feb 19;10:150. doi: 10.3389/fpls.2019.00150

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Copyright © 2019 Yang, Zhang, Wang, Sun, Zhan, Zhao, Ma, Ma and Li.

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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Phenotypes of apple plants under different concentrations of melatonin treatment (0, 100, 500, 1,000, and 5,000 μM). (A) Growth performance, (B) shoot tip phenotypes, (C) stem height, and (D) growth rate were recorded after 14 days of treatment. The plant height was considered the average of 6 plants per treatment. The red circles indicate the shoot tips. Values are means of four replicates SD. Different letters above the column indicate significant difference at P < 0.05 by Duncan’s test. Scale bars represent 5 cm.