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Coordination of Carbon and Nitrogen Metabolism Through Well-Timed Mid-Stage Nitrogen Compensation in Japonica Super Rice

文献类型： 外文期刊

作者： Hu, Qun 1 ; Zhang, Kaiwei 1 ; Jiang, Weiqin 2 ; Qiu, Shi 3 ; Li, Guangyan 1 ; Xu, Fangfu 1 ; Zhu, Ying 1 ; Liu, Guodong 1 ; Gao, Hui 1 ; Zhang, Hongcheng 1 ; Wei, Haiyan 1 ;

作者机构： 1.Yangzhou Univ, Res Inst Rice Ind Engn Technol, Jiangsu Coinnovat Ctr Modern Prod Technol Grain Cr, Jiangsu Key Lab Crop Cultivat & Physiol, Yangzhou 225009, Peoples R China

2.Huaiyin Inst Agr Sci Xuhuai Reg Jiangsu, Huaian 223001, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Germplasm Resources & Biotechnol, Nanjing 210014, Peoples R China

关键词： compensation timing; nitrogen uptake; soluble sugar; starch concentration; non-structural carbohydrates; yield; Japonica rice

期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）

ISSN： 2223-7747

年卷期： 2024 年 13 卷 23 期

页码：

收录情况： SCI

摘要： The carbon and nitrogen (N) metabolism of rice under different mid-stage N compensation timings is unclear. Two Japonica super rice cultivars were examined under four N compensation timings (N1-N3: N compensation at mid-tillering, panicle initiation, and spikelet differentiation. N0: no N compensation) and CK with no N application. Mid-stage N compensation increased the N concentrations of various tissues, and N2 showed the highest plant N uptake at both the heading stage, maturity, and the grain filling period. Among the treatments, N2 showed the highest N utilization efficiency. With delayed compensation timing, there was a gradual decrease in soluble sugar and starch concentrations in each tissue, accompanied by a decline in the non-structural carbohydrate (NSC) concentration. Specifically, N2 treatment exhibited the highest NSC accumulation and the remobilized NSC reserve, but NSCs per spikelet decreased with delayed compensation timing. The highest yield was also obtained with N2, exhibiting a 4.5% increase compared to the N0 treatment, primarily due to an improvement in spikelets per panicle. Conclusively, N compensation at the panicle initiation stage is a reasonable N management strategy that can coordinate the improvement of carbon and N metabolism, enhance N accumulation with efficient utilization and NSC accumulation, and ultimately increase the yield.

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