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Two calcium sensor-activated kinases function in root hair growth.

Xianming Fang1, Beibei Liu1, Haiyan Kong1

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Summary
This summary is machine-generated.

Calcium sensors calcineurin B-like proteins (CBLs) and CBL-interacting protein kinases (CIPKs) regulate plant cell growth. This study reveals CBL2/3-CIPK13/18 modules control Arabidopsis root hair growth, distinct from pollen tube growth regulators.

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Area of Science:

  • Plant Biology
  • Cell Biology
  • Molecular Biology

Background:

  • Polarized tip growth in plant cells like pollen tubes and root hairs is crucial for development.
  • Calcium ions (Ca2+) are essential regulators of cell polarity and growth orientation.
  • Calcineurin B-like proteins (CBLs) and CBL-interacting protein kinases (CIPKs) form Ca2+-decoding modules that regulate cellular processes.

Purpose of the Study:

  • To investigate the role of CBL-CIPK modules in regulating root hair polarized growth in Arabidopsis thaliana.
  • To determine if specific CIPKs, CIPK13 and CIPK18, are involved in root hair development.
  • To elucidate the interaction and function of CBL2/3 with CIPK13/18 in root hair growth.

Main Methods:

  • Gene expression analysis to identify root hair-specific CIPKs.
  • Phenotypic analysis of Arabidopsis double mutants (cipk13 cipk18 and cbl2 cbl3).
  • Yeast two-hybrid screening and biochemical assays to confirm protein interactions and activation.

Main Results:

  • CIPK13 and CIPK18 were identified as specifically expressed in Arabidopsis root hairs.
  • Mutants lacking CIPK13/18 or CBL2/3 exhibited reduced root hair length and growth rates.
  • Calcium oscillations at the root hair tip were diminished in cipk13 cipk18 mutants.
  • CBL2 and CBL3 directly interact with and activate CIPK13 and CIPK18.

Conclusions:

  • CBL2/3-CIPK13/18 complexes function as Ca2+-decoding modules regulating root hair polarized growth.
  • This study reveals a conserved yet distinct mechanism of CBL-CIPK action in different plant cell types.
  • Distinct CIPKs are recruited by the same CBLs to control polarized tip growth in both pollen tubes and root hairs.