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. 2016 Nov 8;7:1637. doi: 10.3389/fpls.2016.01637

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Copyright © 2016 Fu, Feng, Zhang, Yang, Yang, Chen, Zhao, Zhang, Jin and Tao.

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) or licensor 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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Changes in the pollen viability, pollen number and pollen germinating on stigma, and pistil ROS between superior and inferior spikelets. SS and IS were indicated as superior spikelets and inferior spikelets, respectively. (a–d,I) were pollen viability, (i–p,II) was pollen numbers and pollen germinating on stigma, and (q–x,III) were pistil ROS. The data in the figures (I,II,III) were showed as the mean of 10 replicates. Vertical bars denote standard deviations (n = 10). Different letters indicate significant differences between the superior spikelets and inferior spikelets in the same cultivar (P < 0.05).