Modulation of plant root growth by nitrogen source‐defined regulation of polar auxin transport

第一作者：Krisztina Ötvös

第一单位：奥地利科学技术学院

通讯作者：Eva Benková

 Abstract 

大背景：Availability of the essential macronutrient nitrogen in soil plays a critical role in plant growth, development, and impacts agricultural productivity.

研究基础：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.

提出问题：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.

主要研究：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.

结果1-氮依赖性的PIN2去磷酸化和极性定位：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.

结果2-计算模型：A dynamic computer model based on our experimental data successfully recapitulates experimental observations.

结论：Our study provides mechanistic insights broadening our understanding of root growth mechanisms in dynamic environments.

 通讯作者 

** Eva Benková**

doi: https://doi.org/10.15252/embj.2020106862

Journal: the EMBO Journal

Published date: Jan 05, 2021