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. 2021 Feb 16;12:625890. doi: 10.3389/fpls.2021.625890

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Copyright © 2021 Liu, Jin, Tan, Zheng, Gao, Zhang, Zhao, 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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A model to explain the regulatory effect of MdTyDc on apple’s alkaline stress response. Under alkaline stress, apple lines overexpressing MdTyDc showed increased photosynthetic pigment content and inhibited the increase of sodium ions, thus the photosynthetic capacity was enhanced and intracellular ion homeostasis was maintained, which may be realized by increasing dopamine content; In addition, overexpression of MdTyDc also improved the enzyme activity related to nitrogen metabolism, thus promoting nitrogen absorption. Therefore, the alkaline tolerance of transgenic apple plants was increased.