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. 2018 Mar 16;9:332. doi: 10.3389/fpls.2018.00332

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Copyright © 2018 Zhao, Zhao, Jiang, Wang, Xiong, Todorovska, Yin, Chen, Wang, Xie, Pan, Rashid, Zhang, Li 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 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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Mesocotyl lengths (MLs) in 621 cultivated rice and relationship among ML, emergence rate (ER) and planting depth. (A) Principal component plot and distribution of accessions with different ML. (B) Neighbor-joining tree and distribution of accessions with ML of more than 3 cm on the tree. (C) Relationship between ER and ML (upper) and histogram of ML (lower) in field plantings with 10 cm of soil cover. (D) Differentiation of MLs in cultivated accessions. (E) Comparison of MLs of indica and japonica. (F) Relationship between ER and ML in box plantings with different depths of soil cover. Different letters above bars indicate significant differences (p < 0.05) detected by Duncan's multiple range test. (G) Relationship between ML and depth of soil cover for accessions with different mesocotyl elongation capacities.