Split nitrogen fertilizer application improved grain yield in winter wheat (Triticum aestivum L.) via modulating antioxidant capacity and ^(13)C photosynthate mobilization under water-saving irrigation conditions  

作　　者：Zhen Zhang Zhenwen Yu Yongli Zhang Yu Shi 

机构地区：[1]Key Laboratory of Crop Ecophysiology and Farming System,Ministry of Agriculture,Shandong Agricultural University,Tai-an 271017,Shandong,China

出　　处：《Ecological Processes》2021年第1期290-302,共13页生态过程（英文）

基　　金：The National Natural Science Foundation of China(31771715,31771717);Project of Technology System in Modern Wheat Industry,Ministry of Agriculture,China(CARS-3-1-19);Field Station Union Project of Chinese Academy of Sciences(KFJ-SW-YW035).

摘　　要：A water-saving cultivation technique of supplementary irrigation based on soil moisture levels has been adopted for winter wheat production in the Huang-Huai-Hai Plain of China,due to the enhanced water-use efficiency.However,appropriate split nitrogen management may further improve crop growth and grain yield.Here,we conducted a 2-year field experiment to determine if split nitrogen management might improve wheat productivity by enhancing ^(13)C photosynthate mobilization and the antioxidant defense system under water-saving conditions.Split nitrogen management involved a constant total nitrogen rate(240 kg ha^(−1))split in four different proportions between sowing and jointing stage,i.e.,10:0(N1),7:3(N2),5:5(N3),and 3:7(N4).The N3 treatment significantly enhanced“soil-plant analysis development”values,superoxide dismutase antioxidant activity,soluble protein content,sucrose content,and sucrose phosphate synthetase activity,although it reduced the accumulation of malondialdehyde(MDA).The N3 treatment ultimately increased the amount of dry matter assimilation after anthesis significantly.In addition,the ^(13)C isotope tracer experiment revealed that the N3 treatment promoted the assimilation of carbohydrates after anthesis and their partitioning to the developing grains.Compared to the unequal ratio treatments(N1,N2,and N4),the equal ratio treatment(N3)increased grain yield by 5.70–16.72%via increasing 1000-grain weight and number of grains per spike in both growing seasons.Therefore,we recommend the use of a 5:5 basal-topdressing split nitrogen fertilizer application under water-saving irrigation conditions to promote antioxidant enzyme activity and the remobilization of photosynthate after anthesis for improving wheat grain yield.

关 键 词：Split nitrogen fertilization Modulating antioxidant capacity ^(13)C photosynthate mobilization Water-saving irrigation 

分 类 号：S512[农业科学—作物学]