biostudies-literatureJiang ZProvincial 458 key R & D plan, Modern AgricultureJiangsu Agriculture Science and Technology Innovation FundNational Natural Science Foundation of China4864https://www.ebi.ac.uk/biostudies/studies/S-EPMC9106009biostudies-literatureUnknown23(9)The remobilization of non-structural carbohydrates (NSCs) in the stem is essential for rice grain filling so as to improve grain yield. We conducted a two-year field experiment to deeply investigate their relationship. Two large-panicle rice varieties with similar spikelet size, CJ03 and W1844, were used to conduct two treatments (removing-spikelet group and control group). Compared to CJ03, W1844 had higher 1000-grain weight, especially for the grain growth of inferior spikelets (IS) after removing the spikelet. These results were mainly ascribed to the stronger sink strength of W1844 than that of CJ03 contrasting in the same group. The remobilization efficiency of NSC in the stem decreased significantly after removing the spikelet for both CJ03 and W1844, and the level of sugar signalingInternational journal of molecular sciencesSink Strength Promoting Remobilization of Non-Structural Carbohydrates by Activating Sugar Signaling in Rice Stem during Grain Filling.PMC9106009BE202136131871573CX (18) 1002Yang HLi GChen QLi JSakr SHong JChen LXu CJiang YJiang ZLiu ZDing YLiu DfalseSink Strength Promoting Remobilization of Non-Structural Carbohydrates by Activating Sugar Signaling in Rice Stem during Grain Filling.The remobilization of non-structural carbohydrates (NSCs) in the stem is essential for rice grain filling so as to improve grain yield. We conducted a two-year field experiment to deeply investigate their relationship. Two large-panicle rice varieties with similar spikelet size, CJ03 and W1844, were used to conduct two treatments (removing-spikelet group and control group). Compared to CJ03, W1844 had higher 1000-grain weight, especially for the grain growth of inferior spikelets (IS) after removing the spikelet. These results were mainly ascribed to the stronger sink strength of W1844 than that of CJ03 contrasting in the same group. The remobilization efficiency of NSC in the stem decreased significantly after removing the spikelet for both CJ03 and W1844, and the level of sugar signaling2022-01-01T00:00:00Z2022 Apr2025-04-22T19:51:08.651Z2025-02-19T03:41:53.003ZS-EPMC91060093556325510.3390/ijms23094864