The role of the nitrate transporter NRT1.1 in plant iron homeostasis and toxicity on ammonium

文献类型： 外文期刊

第一作者： Li, Guangjie

作者： Li, Guangjie;Zhang, Lin;Wang, Yanqin;Li, Yan;Wang, Zhaoyue;Shi, Weiming;Kronzucker, Herbert J.;Kronzucker, Herbert J.;Chen, Gui

作者机构：

关键词： Ammonium toxicity; Iron; Nitrate; NRT1.1; Root growth

期刊名称：ENVIRONMENTAL AND EXPERIMENTAL BOTANY （ 影响因子：4.7； 五年影响因子：5.4 ）

ISSN： 0098-8472

年卷期： 2025 年 232 卷

页码：

收录情况： SCI

摘要： Ammonium (NH4+) is toxic to root growth in most plants, and NH4+ toxicity has been linked to disruptions in plant Fe homeostasis. However, only a few genes have been linked to the disruption of Fe homeostasis under NH4+ nutrition, and pathway details have as yet to be resolved. Here, using RNA-seq analysis and RT-qPCR, we explore the response of different genes expressed in the roots of Fe-replete and Fe-starved Arabidopsis plants under NH4+ conditions. The Nitrate Transporter 1.1 (NRT1.1) gene, known to code for a dual-affinity nitrate transporter, but not other NRTs genes, was specifically induced in Fe-replete plants in response to NH4+ provision. NRT1.1 antagonizes NH4+-dependent Fe accumulation, and this antagonism requires NO3- supply. Constitutively expressing NRT1.1 confers higher NO3- uptake and reduces NH4+-dependent Fe accumulation by increasing pH in the rhizosphere. Building on previous evidence establishing the involvement of root Fe accumulation in the root growth response to elevated NH4+, our study shows that NRT1.1-mediated nitrate uptake curtails symptoms of NH4+ toxicity under elevated NH4+ and in the presence of NO3-, by increasing rhizospheric pH, offering new insights into possible pathways for improving the tolerance to NH4+ toxicity in plants.

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