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A rapid method for macerating phloem.

C A Peterson1, M A Blais

  • 1Department of Biology, University of Waterloo, Canada.

Biotechnic & Histochemistry : Official Publication of the Biological Stain Commission
|January 1, 1991
PubMed
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A new method uses autoclaving and aniline blue staining to isolate and identify sieve elements in plant phloem. This technique preserves cell walls and callose, allowing for detailed observation of sieve areas and junctures.

Area of Science:

  • Plant Anatomy
  • Phloem Biology
  • Cellular Ultrastructure

Background:

  • Sieve elements, including sieve cells and sieve tube members, are crucial for long-distance transport in plants.
  • Isolating intact sieve elements for detailed study has been challenging due to their delicate nature and the need to preserve specific cellular components.

Purpose of the Study:

  • To develop and validate a mild maceration technique for isolating sieve elements from diverse plant species.
  • To enable clear visualization of sieve element primary walls and callose deposits for anatomical studies.

Main Methods:

  • Autoclaving plant tissues (woody and herbaceous) in a mild macerating medium.
  • Staining isolated cells with aniline blue to detect callose fluorescence.
  • Microscopic examination of macerated and stained sieve elements.

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Main Results:

  • The autoclaving method effectively macerates phloem tissue without degrading primary walls or callose.
  • Aniline blue staining highlights callose on sieve areas and sieve plates, facilitating sieve element identification.
  • The technique allows observation of intact sieve elements, including details of adjacent cell junctures.

Conclusions:

  • This optimized autoclaving and staining protocol provides a reliable method for isolating and identifying sieve elements.
  • The preserved cellular structures, particularly callose, offer valuable insights into sieve element function and development.
  • The technique is applicable across various plant types, supporting comparative anatomical research.