Journal
DEVELOPMENTAL CELL
Volume 56, Issue 6, Pages 781-+Publisher
CELL PRESS
DOI: 10.1016/j.devcel.2021.02.027
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Funding
- National Natural Science Foundation of China (NFSC) [32025004, 31921001]
- Joint Sino-German Research Project - NSFC [31761133011]
- Deutsche Forschungsgemeinschaft (DFG) [391703796]
- Beijing Outstanding University Discipline Program
- Chinese Scholarship Council (CSC) [201806350012]
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The mechanisms underlying plant K+ sensing and downstream responses have been revealed in this study, showing a defined K+ sensing niche and a low-K+ signaling axis that trigger ROS signals and related pathways. These mechanisms coordinate plant growth and development while regulating nutrient uptake by roots.
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. Wedefine the organ-scale K+ pattern of roots and identify a post meristematic 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.
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