Plant iron status regulates ammonium-use efficiency through protein N-glycosylation

文献类型： 外文期刊

第一作者： Li, Guangjie

作者： Li, Guangjie;Zhang, Lin;Li, Guangjie;Wu, Jinlin;Wang, Zhaoyue;Wang, Meng;Shi, Weiming;Wu, Jinlin;Wang, Zhaoyue;Wang, Meng;Shi, Weiming;Kronzucker, Herbert J.;Shi, Weiming

作者机构：

期刊名称：PLANT PHYSIOLOGY （ 影响因子：7.4； 五年影响因子：8.7 ）

ISSN： 0032-0889

年卷期： 2024 年 195 卷 2 期

页码：

收录情况： SCI

摘要： Improving nitrogen-use efficiency is an important path toward enhancing crop yield and alleviating the environmental impacts of fertilizer use. Ammonium (NH4+) is the energetically preferred inorganic N source for plants. The interaction of NH4+ with other nutrients is a chief determinant of ammonium-use efficiency (AUE) and of the tipping point toward ammonium toxicity, but these interactions have remained ill-defined. Here, we report that iron (Fe) accumulation is a critical factor determining AUE and have identified a substance that can enhance AUE by manipulating Fe availability. Fe accumulation under NH4+ nutrition induces NH4+ efflux in the root system, reducing both growth and AUE in Arabidopsis (Arabidopsis thaliana). Low external availability of Fe and a low plant Fe status substantially enhance protein N-glycosylation through a Vitamin C1-independent pathway, thereby reducing NH4+ efflux to increase AUE during the vegetative stage in Arabidopsis under elevated NH4+ supply. We confirm the validity of the iron-ammonium interaction in the important crop species lettuce (Lactuca sativa). We further show that dolomite can act as an effective substrate to subdue Fe accumulation under NH4+ nutrition by reducing the expression of Low Phosphate Root 2 and acidification of the rhizosphere. Our findings present a strategy to improve AUE and reveal the underlying molecular-physiological mechanism. Ammonium-use efficiency is regulated by plant iron status through protein N-glycosylation and LPR2-mediated iron accumulation.

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