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. 2021 Sep 22;12:673236. doi: 10.3389/fpls.2021.673236

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Copyright © 2021 Xing, Ding, Jin, Song, Chen, Chen, Fang and Jiang.

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 melatonin on chrysanthemum seedling growth, chlorophyll content and Rubisco enzyme activity under heat stress. (A) Fresh weight. (B) Dry weight. (C) Chlorophyll a. (D) Chlorophyll b. (E) Total chlorophyll. (F) Rubisco activity. Con, control; S, heat stress; S + MT, heat stress with exogenous melatonin treatment; Con + MT, control with exogenous melatonin treatment. Error bars indicate SE (n = 3). Duncan’s multiple range test was used to analyze significant differences. Different letters indicate significant differences at P < 0.05.