期刊
EMBO JOURNAL
卷 40, 期 3, 页码 -出版社
WILEY
DOI: 10.15252/embj.2020106862
关键词
auxin transport; nutrients; post‐ translational modification; protein trafficking; root development
资金
- Austrian Science Fund [FWF01_I1774S]
- DOC Fellowship Programme of the Austrian Academy of Sciences [25008]
- Programa de Atraccion de Talento 2017 [2017-T1/BIO-5654]
- Agencia Estatal de Investigacion of Spain [SEV-2016-0672]
- Programa Estatal de Generacion del Conocimiento y Fortalecimiento Cientifico y Tecnologico del Sistema de I+D+I 2019 from MICIU [PGC2018-093387-A-I00]
- Austrian Science Fund (FWF) [I03630]
The availability of nitrogen in soil is crucial for plant growth, where plants have evolved different strategies to sense and respond to heterogeneous nitrogen distribution. The coordination of root growth in response to different nitrogen sources involves modulation of root system architecture and auxin flux between tissue layers. This study provides mechanistic insights into the dynamic mechanisms of root growth in response to nitrogen sources, with implications for agricultural productivity.
Availability of the essential macronutrient nitrogen in soil plays a critical role in plant growth, development, and impacts agricultural productivity. Plants have evolved different strategies for sensing and responding to heterogeneous nitrogen distribution. Modulation of root system architecture, including primary root growth and branching, is among the most essential plant adaptions to ensure adequate nitrogen acquisition. However, the immediate molecular pathways coordinating the adjustment of root growth in response to distinct nitrogen sources, such as nitrate or ammonium, are poorly understood. Here, we show that growth as manifested by cell division and elongation is synchronized by coordinated auxin flux between two adjacent outer tissue layers of the root. This coordination is achieved by nitrate-dependent dephosphorylation of the PIN2 auxin efflux carrier at a previously uncharacterized phosphorylation site, leading to subsequent PIN2 lateralization and thereby regulating auxin flow between adjacent tissues. A dynamic computer model based on our experimental data successfully recapitulates experimental observations. Our study provides mechanistic insights broadening our understanding of root growth mechanisms in dynamic environments.
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