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. 2021 Dec 22;12:786043. doi: 10.3389/fpls.2021.786043

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Copyright © 2021 Yang, Sun, Wang, Wang, Kong, Gao and Wen.

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 illustration for melatonin participated in enhancing cold tolerance by exogenous application of selenium. Cold stress inhibited plant growth and increased the production of reactive oxygen species; however, selenium reduced cold stress damage to the plant. Meanwhile, melatonin as the downstream signaling participated in selenium-enhanced cold tolerance of cucumber seedlings. Melatonin biosynthesis genes T5H and COMT play vital roles in exogenous selenium application enhancing the melatonin content, promoting plant cold tolerance.