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. 2020 Apr 16;11:443. doi: 10.3389/fpls.2020.00443

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Copyright © 2020 Wang, Wang, Ge and Dai

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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Daily mean temperature and accumulated chilling days from 1 November 2017 to 1 April 2018. The arrows indicate the three sampling dates. The red line indicates the threshold for accumulating chilling days.