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Related Experiment Videos

New uses for calcium chloride solution as a mounting medium.

J M Herr1

  • 1Department of Biology Sciences, University of South Carolina, Columbia 29208.

Biotechnic & Histochemistry : Official Publication of the Biological Stain Commission
|January 11, 1992
PubMed
Summary

This study presents two reliable methods for identifying lignin in plant tissues. The acid-phloroglucin test stains lignified cells red, while toluidine blue O specifically stains lignin-containing cell walls.

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Area of Science:

  • Plant Anatomy
  • Histology
  • Biochemistry

Background:

  • Lignin is a crucial structural polymer in plant cell walls.
  • Accurate identification of lignin is essential for plant science research.
  • Existing staining methods may have limitations in specificity or application.

Purpose of the Study:

  • To evaluate and compare the effectiveness of the acid-phloroglucin test for lignin detection.
  • To introduce and validate a new staining method using toluidine blue O for specific lignin identification.
  • To provide reliable protocols for visualizing lignified tissues in various plant species.

Main Methods:

  • Plant tissues (stems and roots) were fixed and sectioned.
  • Sections were treated with acid-phloroglucin solutions with varying acid concentrations.

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  • Leaf tissues were processed and stained with acid-phloroglucin mixtures.
  • A novel method involved staining with toluidine blue O followed by treatment with calcium chloride solution.

    • Main Results:

    • The acid-phloroglucin test produced distinct red and orange-red colors in lignified tracheary elements and sclerenchyma, respectively.
    • Astrosclereids in Nymphaea odorata also stained effectively with acid-phloroglucin.
    • Toluidine blue O staining, followed by calcium chloride treatment, specifically highlighted lignified cell walls, with other tissues destaining.

    Conclusions:

    • Both acid-phloroglucin and toluidine blue O are effective for staining lignified plant tissues.
    • The toluidine blue O method offers a specific and reliable alternative for lignin detection.
    • These staining techniques enhance the study of plant cell wall composition and structure.