Responses of photosynthetic characteristics and enzyme activity of nitrogen metabolism to low nitrogen in maize with different nitrogen tolerance

查看全文 作　　者：Pengtao [1]Ji;Yongwei [2]Cui;Xiangling [3]Li;Kai [1]Xiao;Peijun [1]Tao;Yuechen [1]Zhang

机构地区：[1]College of Agronomy,Hebei Agricultural University/State Key Laboratory of North China Crop Improvement and Regulation,Baoding 071001,Hebei,China;[2]Academy of Agricultural Planning and Engineering,Ministry of Agriculture and Rural Affairs,Beijing 100125,China;[3]College of Agronomy and Biotechnology,Hebei Normal University of Science&Technology,Qinhuangdao 066004,Hebei,China

出　　处：《International Journal of Agricultural and Biological Engineering》索引2020年第13卷第6期,共11页

基　　金：This work was supported by the National Key Research and Development Program of China(No.2018YFD0300503);We gratefully acknowledge Jianhang Jia and Wei Ma for revising the manuscript.We also sincerely thank the reviewers for the critical comments on our original manuscript. 摘　　要：Understanding the physiological processes associated with leaf photosynthetic characteristics and nitrogen(N)assimilation during grain-filling stage are helpful for enhancing nitrogen utilization efficiency(NUtE)of maize.In this study,the leaf photosynthetic and N assimilation parameters in maize,including Zhengdan 958(ZD958),a low-N tolerance cultivar and Huanong 138(HN138),a low-N sensitive cultivar under different N rates were examined.Results showed that ZD958 displayed significant increases on grain yield and NUtE than that in HN138.Analyses on the leaf photosynthetic and N assimilation-associated processes indicated that ZD958 had higher leaf N remobilization(Rem N),net photosynthetic rate(Pn)and photosynthetic N use efficiency(PNUE)with respect to those of HN138 during grain-filling stage.In addition,ZD958 was also shown to be higher activities of leaf nitrate reductase(NR),glutamine synthetase(GS),nitrate reductase(GDH)and glutamine synthetase(GAGOT)than those of HN138.The leaf PNUE was significantly positively correlated with NR,GS,GDH,GOGAT suggesting that leaf PNUE and NR,GS,GDH,GOGAT jointly determined the N remobilization efficiency and the leaf N remobilization during post-silking.These results suggested that ZD958 possessed improved PNUE,NR and GS activities in leaves during grain-filling stage that contributes improve grain weights and yield formation capacities upon under low-N conditions. 关键词：low-N PHOTOSYNTHESIS nitrogen assimilation nitrogen utilization efficiency MAIZE

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Responses of photosynthetic characteristics and enzyme activity of nitrogen metabolism to low nitrogen in maize with different nitrogen tolerance

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