A potassium-sensing niche in Arabidopsis roots orchestrates signaling and adaptation responses to maintain nutrient homeostasis.
A potassium-sensing niche in Arabidopsis roots orchestrates signaling and adaptation responses to maintain nutrient homeostasis.
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DOI：
10.1016/j.devcel.2021.02.027
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发表时间：
2021-03
影响因子：
11.8
通讯作者：
Feng-Liu Wang;Ya-Lan Tan;L. Wallrad;Xin-Qiao Du;Anna Eickelkamp;Zhi-fang Wang;Gefeng He;Felix Rehms;Zhen Li;Jian-Pu Han;Ina Schmitz-Thom;Wei-Hua Wu;J. Kudla;Yi Wang
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作者：
Feng-Liu Wang;Ya-Lan Tan;L. Wallrad;Xin-Qiao Du;Anna Eickelkamp;Zhi-fang Wang;Gefeng He;Felix Rehms;Zhen Li;Jian-Pu Han;Ina Schmitz-Thom;Wei-Hua Wu;J. Kudla;Yi Wang
必需离子K+的生物体内平衡需要对其可用性、有效吸收和确定分布的感测。了解植物K+营养对促进可持续农业至关重要，但K+传感和下游响应的协调机制在很大程度上仍然难以捉摸。在这里，我们报告植物的感觉K+剥夺，以及如何将其转化为空间定义的ROS信号来管理特定的下游反应。我们定义了根的器官尺度K+模式，并确定了一个分生后K+敏感生态位（KSN），快速K+下降和Ca 2+信号相吻合。此外，我们概述了CIF肽激活的SGN 3-LKS 4/SGN 1受体复合物的分叉低K+信号传导轴，该复合物传递NADPH氧化酶RBOHC、RBOHD和RBOHF的低K+触发磷酸化。由此产生的ROS信号同时传递HAK 5 K+摄取转运蛋白诱导和加速凯氏带成熟。总的来说，这些机制使发育分化和转录组重编程同步，以维持K+稳态并优化根的营养觅食。
Organismal homeostasis of the essential ion K+requires sensing of its availability, efficient uptake, and defined distribution. Understanding plant K+nutrition is essential to advance sustainable agriculture, but the mechanisms underlying K+sensing and the orchestration of downstream responses have remained largely elusive. Here, we report where plants sense K+deprivation and how this translates into spatially defined ROS signals to govern specific downstream responses. We define the organ-scale K+pattern of roots and identify a postmeristematic K+-sensing niche (KSN) where rapid K+decline and Ca2+signals coincide. Moreover, we outline a bifurcating low-K+-signaling axis of CIF peptide-activated SGN3-LKS4/SGN1 receptor complexes that convey low-K+-triggered phosphorylation of the NADPH oxidases RBOHC, RBOHD, and RBOHF. The resulting ROS signals simultaneously convey HAK5 K+uptake-transporter induction and accelerated Casparian strip maturation. Collectively, these mechanisms synchronize developmental differentiation and transcriptome reprogramming for maintaining K+homeostasis and optimizing nutrient foraging by roots.