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. 2025 Feb 3;16:1537378. doi: 10.3389/fpls.2025.1537378

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Copyright © 2025 Ning, Su, Shi, Ji, Ouyang, Song, Shao, Zhu and Chang

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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Carbon concentration of rice single stem nutrient organs at various stages. (A) leaf, (B) sheath, (C) internode. Note: T1: booting stage, T2: grain filling stage, T3: maturity; L1: flag leaf, L2: basipetal 2^nd leaf, L3: basipetal 3^rd leaf; Sh1: flag sheath, Sh2: basipetal 2^nd l sheath, Sh3: basipetal 3^rd sheath; I1: basipetal 1^st internode, I2: basipetal 2^nd internode, I3: basipetal 3^rd internode. The flag internode was not elongated at T1, so no data were available, and the uppermost internode of this stage is I2. Booting stage samples were obtained on June 12^th to June 18^th, the day of the ¹³CO₂ labeling, grain filling stage samples were obtained on June 27^th, maturity stage samples were obtained on July 17^th. 6 replications were measured for each treatment.