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Label-free in situ Imaging of Lignification in Plant Cell Walls
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A rapid and quantitative safranin-based fluorescent microscopy method to evaluate cell wall lignification.

Fabien Baldacci-Cresp1,2, Corentin Spriet1,3, Laure Twyffels4

  • 1UMR 8576 - Unité de Glycobiologie Structurale et Fonctionnelle (UGSF), Université de Lille, Centre national de la recherche scientifique (CNRS), F-59000, Lille, France.

The Plant Journal : for Cell and Molecular Biology
|January 10, 2020
PubMed
Summary

This study introduces a new, quantitative method using safranin-O staining and fluorescent microscopy to measure plant cell wall lignin. This faster, safer approach aids in plant cell wall research and lignin biosynthesis studies.

Keywords:
cell wallconfocal microscopyligninsafranintechnical advance

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Area of Science:

  • Plant Biology
  • Biochemistry
  • Microscopy

Background:

  • Plant cell walls are reinforced by lignin, a polymer crucial for vascular plants.
  • Lignin provides hydrophobicity to conducting tissues and mechanical support.
  • Accurate lignin quantification is essential for understanding plant development and function.

Purpose of the Study:

  • To develop a quantitative, rapid, and safe method for determining lignin content in plant cell walls.
  • To adapt fluorescent microscopy and safranin-O staining for precise lignin analysis.
  • To validate the new methodology using plant mutants and diverse species.

Main Methods:

  • Utilized fluorescent microscopy coupled with safranin-O staining.
  • Developed a ratiometric emission measurement approach.
  • Created an ImageJ macro for automated image analysis.
  • Validated the method on Arabidopsis thaliana mutants and other plant species.

Main Results:

  • Successfully developed a quantitative safranin-O staining method for lignin determination.
  • Demonstrated the method's efficacy in comparing lignin content across Arabidopsis mutants.
  • Provided new insights into laccase gene function in lignin deposition.
  • Validated the methodology across multiple plant species including flax, maize, and poplar.

Conclusions:

  • The safranin-O staining method offers a significant improvement in speed and efficiency for plant cell wall and lignin research.
  • This quantitative approach facilitates anatomical and developmental investigations of lignin.
  • The methodology holds potential for broader applications in plant science and biotechnology.