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Staining tomato fruit cuticle and exocarp tissues

E T Graham1

  • 1Department of Ornamental Horticulture, University of Tennessee, Knoxville 37901-1071, USA.

Biotechnic & Histochemistry : Official Publication of the Biological Stain Commission
|May 1, 1997
PubMed
Summary

Researchers explored tomato fruit histology, finding Bismarck brown-hematoxylin-alcian blue staining effectively visualizes cuticle and nuclei. This method aids in studying epidermal cell structures in Lycopersicon esculentum.

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Area of Science:

  • Plant biology
  • Histology
  • Fruit development

Background:

  • The tomato (Lycopersicon esculentum) fruit cuticle and epidermis are crucial for fruit protection and development.
  • Understanding their histological features requires effective staining techniques.

Purpose of the Study:

  • To investigate the cuticle, its interface with the epidermis, and the histology of the outer exocarp of immature tomato fruit.
  • To evaluate different staining combinations for optimal visualization of these structures.

Main Methods:

  • Immature tomato fruits (Lycopersicon esculentum cv. Celebrity) were sectioned using paraffin embedding.
  • Sections were stained with Bismarck brown Y, followed by azure B, aluminum hematoxylin and alcian blue SGX, or periodic acid-Schiff (PAS) reaction.
  • Staining efficacy was assessed for contrast, nuclear identification, and specific tissue staining.

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Main Results:

  • Bismarck brown-azure B provided good cuticle contrast but poor nuclear visibility at low magnification.
  • Bismarck brown-hematoxylin-alcian blue yielded excellent contrast, clearly distinguishing yellow cuticle, blue cell walls, and purple nuclei, easily identifiable at x100.
  • Bismarck brown-PAS stained the cuticle golden brown and subjacent tissues magenta; notably, epidermal cells stained intensely with PAS, a reaction blocked by aldehyde blockade and omission of periodic acid.

Conclusions:

  • The Bismarck brown-hematoxylin-alcian blue staining method is superior for visualizing tomato fruit exocarp histology, particularly for identifying nuclei.
  • The periodic acid-Schiff (PAS) reaction specifically stains tomato epidermal cells, suggesting the presence of unique carbohydrate or glycoprotein components.
  • These findings offer improved histological tools for studying tomato fruit development and structure.