ACTA AGRICULTURAE BOREALI-SINICA ›› 2021, Vol. 36 ›› Issue (5): 107-117. doi: 10.7668/hbnxb.20192227

Special Issue: Rice

• Tillage & Cultivation·Physiology & Biochemistry • Previous Articles     Next Articles

Effect of Non-structural Carbohydrate in Stem and Sheath on Grain Filling and Quality of Superior and Inferior Spikelets in Large-Panicle Japonica Rice

TANG Yiping1, LI Xiangfeng1, WANG Hui1, HU Wangqin1, REN Chuting1, HUANG Yaru1, XU Peng1, YOU Cuicui1, KE Jian1, HE Haibing1, WU Liquan1,2   

  1. 1. College of Agronomy, Anhui Agricultural University, Hefei 230036, China;
    2. Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing 210095, China
  • Received:2021-05-24 Published:2021-10-28

Abstract: In order to improve grain yield and quality of large-panicle japonica rice, the two large-panicle japonica rice varieties, W1844 and CJ03 were grown in paddy field. The content of non-structural carbohydrate(NSC) in the stem and sheath before heading would be changed through the shading and removing tillering treatments, namely T0(control), S1(50% shading), S2(75% shading), D1(removing the whole row of rice plants in every other row), D2(removing the whole row of rice plants in every other row and the tillering of each hole, reserving only the main stem), to explore the effects of NSC on the grain-setting characteristics, grain filling characteristics and quality of superior and inferior spikelets in large-panicle japonica rice, and to clarify the correlation among carbohydrate-spikelet ratio(amount of non-structural carbohydrate in the stems and sheaths over the number of spikelets) with grains yield and quality formation. The results showed that D1 and D2 treatments significantly increased the carbohydrate-spikelet ratio at heading, filled-grain percentage and 1000-grain weight of inferior spikelets. Compared with the T0, the carbohydrate-spikelet ratio was increased by 47.84%-173.59%, filled-grain percentage of inferior spikelets was increased by 4.1-7.2 percentage points and 1000-grain weight of inferior spikelets was increased by 6.06%-14.29%. The carbohydrate-spikelet ratio at heading, filled-grain percentage and 1000-grain weight of inferior spikelets were significantly decreased under the S1 and S2 treatments. The carbohydrate-spikelet ratio was decreased by 33.28%-53.79%;filled-grain percentage of inferior spikelets was decreased by 6.8-32.8 percentage points and 1000-grain weight of inferior spikelets was decreased by 13.54%-45.02%. The D2 and S2 treatments significantly affected the early stage of filling for inferior spikelets. The filling time in the early stage for inferior spikelets was shortened by 6.80, 7.10 d under D2, respectively; and increased by 9.50, 8.26 d under S2, respectively. The mean grain-filling rate in the early stage for inferior spikelets was increased by 65.78%, 61.15% under D2, respectively; and decreased by 44.35%, 43.28% under S2, respectively. D2 treatments improved grain quality, while the S2 decreased grain quality. The correlation analysis indicated that carbohydrate-spikelet ratio had significantly or extremely significantly positive correlation with filled-grain percentage, 1000-grain weight, processing quality and amylose content of inferior spikelet, and had significantly or extremely significantly negative correlation with chalkiness, chalkiness degree and protein content of inferior spikelet. Together, the results showed that carbohydrate-spikelet ratio at heading stage could increase the grain filling in the early stage for inferior spikelets to enhance the filled-grain percentage and 1000-grain weight of inferior spikelet and improve rice quality.

Key words: Large-panicle japonica rice, Non-structural carbohydrate in the stem and sheath, Grain filling characteristics, Rice quality

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Cite this article

TANG Yiping, LI Xiangfeng, WANG Hui, HU Wangqin, REN Chuting, HUANG Yaru, XU Peng, YOU Cuicui, KE Jian, HE Haibing, WU Liquan. Effect of Non-structural Carbohydrate in Stem and Sheath on Grain Filling and Quality of Superior and Inferior Spikelets in Large-Panicle Japonica Rice[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2021, 36(5): 107-117. doi: 10.7668/hbnxb.20192227.

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