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. 2020 Jun 18;11:785. doi: 10.3389/fpls.2020.00785

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Copyright © 2020 Xu, Tang, Wang, Ge, Sun, Qi, He, Zhou, Chen, Xu, Ma and Chen.

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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A proposed model for the role of SiMYB56 in drought tolerance regulation. Under drought stress, SiMYB56 expression is up-regulated, activating the expression of lignin synthesis related genes, such as 4CL5 and F5H1, which results in increased lignin content and subsequent drought tolerance. Up-regulation of SiMYB56 also increased ABA accumulation and upregulates ABA responsive genes, such as P5CS1 and LEA7, leading to osmolyte accumulation that supplements enhanced drought tolerance provided by increased lignin content.