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. 2021 Feb 4;11:599111. doi: 10.3389/fpls.2020.599111

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Copyright © 2021 Lu, Guan, Gu, Yang, Wang, Qi, Li and Liu.

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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Schematic presentation of DA-6 regulation systematic in tomato leaves under low night temperature stress. Exogenous DA-6 increases the chlorophyll content and stabilizes the chloroplast structure by regulating the expression changes of chlorophyll synthesis and degradation genes and promoting the accumulation of CTK, thereby maintaining the photosynthetic rate. In addition, DA-6 maintains a high level of ABA content under low night temperature stress, and significantly induced CBFs expression, which contribute to the activation of the expression of downstream low temperature response genes and accumulation compatible osmolytes. These will increase the cold acclimation of tomato leaves under low night temperature stress. LNT, low night temperature; DA-6, diethyl aminoethyl hexanoate; CTK, cytokinin; ABA, abscisic acid; CBF, C-repeat-binding factors; COR, cold-regulated genes.