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Low ammonium and high nitrate input improves nitrogen use efficiency and growth in sugarcane through coordinated reprogramming of nitrogen and carbon metabolism

文献类型： 外文期刊

作者： Zhan, Jian 1 ; Zhou, Yifan 1 ; Yang, Linsheng 1 ; Lakshmanan, Prakash 4 ; Deng, Ke 1 ; Zhang, Di 1 ; Meng, Bo 1 ; Wang, Huayang 1 ; Deng, Yan 1 ; Chen, Xinping 1 ; Zhang, Fusuo 1 ;

作者机构： 1.Southwest Univ, Interdisciplinary Res Ctr Agr Green Dev Yangtze Ri, Chongqing 400716, Peoples R China

2.Southwest Univ, Coll Resources & Environm, Chongqing 400716, Peoples R China

3.Southwest Univ, Key Lab Low carbon Green Agr Southwestern China, Minist Agr & Rural Affairs, Chongqing 400716, Peoples R China

4.Guangxi Acad Agr Sci, Sugarcane Res Inst, Nanning 530007, Guangxi, Peoples R China

5.Univ Queensland, Queensland Alliance Agr & Food Innovat, St Lucia, Qld, Australia

6.China Agr Univ, Ctr Resources Environm & Food Secur, Beijing 100193, Peoples R China

关键词： Ammonium-to-nitrate-ratio; Ammonium toxicity; Multi-omics; Nitrogen assimilation; Sugarcane

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：5.7； 五年影响因子：6.4 ）

ISSN： 0981-9428

年卷期： 2025 年 229 卷

页码：

收录情况： SCI

摘要： Providing plants with adequate nitrogen (N) through an appropriate ammonium-to-nitrate-ratio (NH4+/NO3-- ratio) can enhance nitrogen use efficiency (NUE) and promote growth. However, how different NH4+/NO3--ratios affect N and carbon (C) metabolic processes and growth in sugarcane, a fast-growing high-biomass crop, remain unclear. Here, a hydroponic experiment was conducted using sugarcane variety 'Yunzhe05-51 ', applying seven NH4+/NO3--ratios under a constant total N supply level of 10 mmol center dot L-1. Plant growth, activities of N-related enzymes, and dual transcriptomic and untargeted metabolomic responses were measured to investigate the regulation of N and C metabolism. The results indicated that an NH4+/NO3--ratio of 20/80 was optimal for sugarcane growth. Enhanced activities of leaf NO3-reductase and NH4+ anabolic enzymes, together with more balanced C and N metabolic processes, explained the potential regulatory mechanisms that promoted sugarcane growth under this ratio. NO3--only treatment downregulated the expression and abundance of several genes and metabolites associated with photosynthesis, while promoting NO3-transport and reduction. When NH4+ supply exceeded 4 mmol center dot L-1, sugarcane showed signs of toxicity. Although activities of NH4+ assimilation enzymes were relatively lower under exclusive NH4+ supply, high NH4+ concentrations resulted in higher L-glutamate levels, indicating growth inhibition under such conditions related to disruptions in protein posttranslational modifications. Furthermore, several metabolites and metabolic pathways associated with stress tolerance and detoxification were activated under high NH4+ conditions. Collectively, this study elucidates the optimal NH4+/NO3-- ratio for sugarcane growth under adequate N availability and provides insights into the underlying metabolic regulatory mechanisms.

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