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. 2018 Jun 28;9:875. doi: 10.3389/fpls.2018.00875

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Copyright © 2018 Song, Li, Sun, Hu, Wu, Liu, Wang, Ma and Zhao.

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 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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The distribution of cold tolerance for the 150 accessions of landrace in the Ting’s rice core collection. level 1–level 9: level 1, 0% DS; level 3, 0.1 – 20.0% DS; level 5, 20.1 – 50% DS; level 7, 50.1 – 99.9% DS; and level 9, 100% DS. The Y-axis represents number of accessions and X-axis represents cold tolerance level. The value on each bar represents the percentage of the total accessions of the core collection.