The rice cultivars carrying dep1 (dense and erect panicle 1) have the potential to achieve both high grain yield and high nitrogen use efficiency (NUE). However, few studies have focused on the agronomic and physiological performance of those cultivars associated with high yield and high NUE under field conditions. Therefore, we evaluated the yield performance and NUE of two near-isogenic lines (NILs) carrying DEP1 (NIL-DEP1) and dep1-1 (NIL-dep1) genes under the Nanjing 6 background at 0 and 120 kg N ha–1. Grain yield and NUE for grain production (NUEg) were 25.5 and 21.9％ higher in NIL-dep1 compared to NIL-DEP1 averaged across N treatments and planting years, respectively. The yield advantage of NIL-dep1 over NIL-DEP1 was mainly due to larger sink size (i.e., higher total spikelet number), grainfilling percentage, total dry matter production, and harvest index. N utilization rather than N uptake contributed to the high yield of NIL-dep1. Significantly higher NUEg in NIL-dep1 was associated with higher N and dry matter translocation efficiency, lower leaf and stem N concentration at maturity, and higher glutamine synthetase (GS) activity in leaves. In conclusion, dep1 improved grain yield and NUE by increasing N and dry matter transport due to higher leaf GS activity under field conditions during the grain-filling period.

HUANG Li-ying;LI Xiao-xiao;ZHANG Yun-bo;Shah FAHAD;WANG Fei

Engineering Research Center of Ecology and Agricultural Use of Wetland,Ministry of Education,Yangtze University,Jingzhou 434025,P.R.China;College of Agriculture,Yangtze University,Jingzhou 434025,P.R.China;National Key Laboratory of Crop Genetic Improvement,MARA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River,College of Plant Science and Technology,Huazhong Agricultural University,Wuhan 430070,P.R.China;Hubei Collaborative Innovation Center for Grain Industry,Yangtze University,Jingzhou 434025,P.R.China;Department of Agronomy,The University of Haripur,Haripur 22620,Pakistan

农业科学学报（英文）

[1]HUANG Li-ying;LI Xiao-xiao;ZHANG Yun-bo;Shah FAHAD;WANG Fei-.dep1 improves rice grain yield and nitrogen use efficiency simultaneously by enhancing nitrogen and dry matter translocation)[J].农业科学学报（英文）,2022(11):3185-3198

dep1,NILs,DEP1,NUEg,grainfilling

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