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CHL1 functions as a nitrate sensor in plants.

Cheng-Hsun Ho1, Shan-Hua Lin, Heng-Cheng Hu

  • 1Molecular Cell Biology, Institute of Molecular Biology, Academia Sinica, and Taipei, Taiwan.

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Summary
This summary is machine-generated.

Plants sense soil nitrate levels using the CHL1 transporter, which acts as a dual-affinity ion sensor. Phosphorylation by CIPK23 regulates CHL1

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Area of Science:

  • Plant Biology
  • Molecular Plant Physiology
  • Ion Transport

Background:

  • Ions are vital nutrients and signaling molecules in plants.
  • Plant sensing mechanisms for soil nutrient variations are not fully understood.
  • CHL1 transporter exhibits dual-affinity characteristics based on T101 phosphorylation status.

Purpose of the Study:

  • To investigate the role of the nitrate transporter CHL1 as a nitrate sensor in plants.
  • To elucidate the mechanism by which CHL1 senses varying nitrate concentrations.
  • To understand the function of CHL1 phosphorylation in primary nitrate responses.

Main Methods:

  • Analysis of uptake- and sensing-decoupled CHL1 mutants.
  • Study of CHL1T101D and CHLT101A transgenic plants.
  • In vitro and in vivo biochemical assays.
  • Investigation of protein kinase CIPK23 activity on CHL1.

Main Results:

  • CHL1 functions as a nitrate sensor, independent of its transport activity.
  • Phosphorylated CHL1 mediates a low-level primary nitrate response, while dephosphorylated CHL1 mediates a high-level response.
  • CIPK23 phosphorylates CHL1 at T101, contributing to low-nitrate sensing and response maintenance.

Conclusions:

  • CHL1 functions as a dual-affinity ion sensor in higher plants.
  • A phosphorylation switch mechanism allows CHL1 to sense a wide range of soil nitrate concentrations.
  • CHL1 integrates nutrient sensing and signaling pathways in plants.