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Single-cell nuclear transcriptomics reveal root tip adaptations to nitrogen scarcity in wheat

文献类型： 外文期刊

作者： Hai, Chuangbei 1 ; Li, Yan 2 ; Peng, Chaojun 2 ; Hu, Lin 2 ; Xu, Weigang 1 ;

作者机构： 1.Northwest A&F Univ, Coll Agron, Yangling 712100, Shaanxi, Peoples R China

2.Henan Acad Agr Sci, Key Lab Wheat Biol & Genet Breeding Cent Huanghuai, Inst Crops Mol Breeding,Henan Key Lab Wheat Germpl, Natl Engn Lab Wheat,Shennong Lab,Minist Agr, Zhengzhou 450002, Henan, Peoples R China

关键词： Single-nucleus RNA-seq; Root function; Nitrogen scarcity; Epidermal cell

期刊名称：CROP JOURNAL （ 影响因子：5.6； 五年影响因子：6.0 ）

ISSN： 2095-5421

年卷期： 2025 年 13 卷 4 期

页码：

收录情况： SCI

摘要： Roots play a critical role in acquisition and utilization of nitrogen in wheat, influencing nitrogen use efficiency (NUE), and ultimately determining yield. However, the detailed responses of root tips to fluctuations in nitrogen availability and the underlying regulatory mechanisms enabling adaptation to nitrogen-limited conditions, remain elusive. In this study, we used single-cell nuclear transcriptomics of the high-nitrogen utilization variety (HNV) Zhengmai 1860 (ZM1860) to construct a comprehensive map of root tip cells under both controlled and nitrogen starvation (N-starv) conditions. Identification of various cell types and their associated genes highlighted the diversity of cellular processes. Using single-nucleus consensus weighted gene co-expression network analysis (hdWGCNA), we identified key modules central to nitrogen metabolism. These identified the prominent role of epidermal cells (EC). The gene TaGS1.2, which is involved in glutamine synthesis, exhibited increased expression under nitrogen-deficient conditions, validating its functional significance in nutrient acquisition. Serving as a key functional gene that adapts to nitrogen-deficient conditions this gene also positively regulated root development. Analysis of the transcriptional regulatory network in EC further revealed the pivotal role of TaGS1.2 in the nitrogen metabolism network. We also uncovered mechanisms that enhance cell-to-cell communication in nitrogen-deficient environments by identifying specific receptors. Single-cell nuclear transcriptome mapping offers valuable insights into the complex responses of root tip cells to nitrogen scarcity and guides future breeding strategies aimed at developing more nitrogen-efficient wheat varieties. (c) 2025 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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