Enhancing aniline blue fluorescent staining of cell wall structures

Area of Science:

• Plant Anatomy
• Wood Science
• Cell Biology

Background:

• Aniline blue is a vital stain for visualizing plant cell structures.
• Compression wood in conifers exhibits unique anatomical features.
• Autofluorescence can obscure details in plant tissues.

Purpose of the Study:

• To investigate the compatibility of common staining and reduction methods with aniline blue fluorescence.
• To determine if these prior treatments improve the visualization of specific conifer compression wood structures.

Main Methods:

• Conifer compression wood samples were subjected to prior staining with periodic acid-Schiff, toluidine blue O, Congo red, or Calcofluor White M2R New.
• Sodium borohydride (NaBH4) reduction was also employed.
• Aniline blue-induced fluorescence of sieve plates, new cell walls, pit fields, and tracheids was then observed.

Main Results:

• Periodic acid-Schiff, toluidine blue O, Congo red, Calcofluor White M2R New, and NaBH4 treatments did not interfere with aniline blue fluorescence.
• These pretreatment methods improved the detailed visualization of fluorescent structures.
• Improvements were attributed to increased contrast, reduced flare, and quenched autofluorescence.

Conclusions:

• Established staining and reduction techniques are compatible with aniline blue fluorescence microscopy.
• These methods enhance the study of conifer compression wood anatomy by improving image quality.
• The findings support the use of these combined techniques for detailed anatomical analysis.