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. 2018 Oct 23;9:1457. doi: 10.3389/fpls.2018.01457

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Copyright © 2018 Duan, Wu, Zhou, Ren, Shao, Feng, Zhu, He and Guo.

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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Relationships between grain yield and the ratio of upper- to lower-layer RI, and LAI at anthesis, early, and mid-grain filling. (A–C) Relationships between yield and LAI at anthesis (A), early grain filling stage, (B) and mid grain filling stage (C). (D–F) Relationships between yield and ratio of upper- to lower-layer RI at anthesis (D), early grain filling stage, (E) and mid grain filling stage (F). High DM, DM at anthesis >13,000 kg ha^-1; low DM, DM at anthesis <13,000 kg ha^-1. Significant at ^∗p = 0.05, ^∗∗p = 0.01, and ^∗∗∗p = 0.001.