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Related Concept Videos

Role of Microtubules in Cell Wall Deposition01:02

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Cell division is essential for organismal growth and development. In animal cells, the central spindle and its associated proteins form the midbody, a structure that has an essential role in cytokinesis. In plants, the central spindle, along with the microtubules, actin, and other cell components, matures into the phragmoplast, which is necessary for cytokinesis. Unlike the stationary midbody, the phragmoplast expands centrifugally, eventually leading to the formation of the new cell wall.
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Live Cell Imaging of Microtubule Cytoskeleton and Micromechanical Manipulation of the Arabidopsis Shoot Apical Meristem
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WAKL8 Regulates Arabidopsis Stem Secondary Wall Development.

Yingxuan Ma1,2, Luke Stafford2, Julian Ratcliffe2

  • 1School of BioSciences, University of Melbourne, Parkville, VIC 3052, Australia.

Plants (Basel, Switzerland)
|September 9, 2022
PubMed
Summary

Wall-associated kinase-like 8 (WAKL8) regulates secondary cell wall thickening in Arabidopsis stems. Mutants showed reduced stem length and thinner xylem vessel and fiber walls, indicating WAKL8

Keywords:
cell wall integrity (CWI)celluloseligninsecondary cell wall (SCW)wall-associated kinases (WAKs)/kinase-likes (WAKLs)

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Area of Science:

  • Plant biology
  • Cell wall development
  • Molecular genetics

Background:

  • Wall-associated kinases/kinase-likes (WAKs/WAKLs) are plant cell surface receptors.
  • Their roles in primary cell wall regulation are known, but less is understood about their function in secondary cell wall (SCW) development.

Purpose of the Study:

  • To identify WAK/WAKL genes involved in SCW development in Arabidopsis thaliana.
  • To investigate the function of the candidate gene WAKL8 in SCW formation.

Main Methods:

  • RNA sequencing (RNA-seq) to screen for candidate WAKs/WAKLs.
  • Analysis of T-DNA insertion mutants (wakl8-1 and wakl8-2) and comparison with wild-type (WT) plants.
  • Phenotypic analysis of stem growth and cell wall composition (cellulose, lignin).

Main Results:

  • WAKL8 was identified as a candidate gene involved in SCW development.
  • Wakl8-2 mutants exhibited reduced stem length and thinner walls in xylem vessels (XV) and interfascicular fibers (IFs).
  • No significant changes in crystalline cellulose or lignin content were observed in mutant stems.

Conclusions:

  • WAKL8 plays a role in regulating SCW thickening in Arabidopsis stems.
  • Alternative spliced versions of WAKL8 might influence its function.