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Partial replacement by ammonium nutrition enhances Brassica napus growth by promoting root development, photosynthesis, and nitrogen metabolism

文献类型： 外文期刊

作者： Zhang, Wen 1 ; Munyaneza, Venuste 1 ; Wang, Dandan 1 ; Huang, Chenfeng 1 ; Wu, Siyuan 1 ; Han, Mingcun 1 ; Wang, Xu 2 ; Kant, Surya 3 ; Ding, Guangda 1 ;

作者机构： 1.Huazhong Agr Univ, Key Lab Arable Land Conservat Middle & Lower Reach, Coll Resources & Environm, Microelement Res Ctr,Minist Agr & Rural Affairs, Wuhan 430070, Peoples R China

2.Minist Agr & Rural Affairs, Inst Qual Stand & Monitoring Technol Agroprod, Guangdong Acad Agr Sci, Key Lab Testing & Evaluat Agroprod Safety & Qual, Guangzhou, Peoples R China

3.La Trobe Univ, Sch Agr Biomed & Environm, AgriBio, 5 Ring Rd, Bundoora, Vic 3083, Australia

关键词： Brassica napus; Ammonium; Nitrate; Photosynthesis; Nitrogen metabolism

期刊名称：JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：4.1； 五年影响因子：4.3 ）

ISSN： 0176-1617

年卷期： 2025 年 304 卷

页码：

收录情况： SCI

摘要： Nitrogen (N) is crucial for plant growth, available primarily as nitrate (NO3-) and ammonium (N-H(4)+). However, its presence in soil is often limited, necessitating strategies to augment N availability. This study delves into the enigmatic interplay between NO3- and NH4+ in fostering the growth of Brassica napus, an important oil crop worldwide. Here, we examined the growth responses of 49 B. napus varieties to five NH4+:NO3- ratios (12:0, 9:3, 3:9, 1:11, 0:12). In general, the biomass of 49 rapeseed varieties increased with the decrease of NH4+ to NO3- ratios in the growth environment. However, different varieties may respond diversely to the mixed N sources, or sole NO3- or NH4+ condition. For some cultivars, the mixed N supply significantly enhanced the plant growth compared with the sole NO3- conditions. Thus, we further investigate the morphological, physiological and molecular response of rapeseed to the mixed N source condition using sole NO3- as a control. The results show that partial replacement by ammonium nutrition in the environment can promote rapeseed root development, net photosynthetic rate and NO3- reduction compared to NO3--only conditions. Using transcriptome analysis, we found a total of 399 and 465 genes which were differentially expressed in root and shoot under A1N11 compared to A0N12 treatments, respectively. Genes involved in photosynthesis, N uptake and assimilation were upregulated by mixed N supplies. These findings highlight that the mixed N supply primarily stimulates B. napus growth by enhancing root development, photosynthesis and N metabolism in the shoot. Such insights are crucial for optimizing N form selection in B. napus to enhance plant performance and N use efficiency.

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