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An improved pollen number counting method using a cell counter and mesh columns.

Hiroyuki Kakui1, Eriko Tsurisaki2, Hidenori Sassa3

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A new method accurately counts Japanese cedar (Cryptomeria japonica) pollen grains. This technique is crucial for understanding pollinosis and can be adapted for other plant species.

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Area of Science:

  • Botany
  • Plant Science
  • Allergology

Background:

  • Pollen quantification is vital for evolutionary, agricultural, and medical research.
  • Cupressaceae family trees, particularly Japanese cedar (Cryptomeria japonica), are significant global causes of pollinosis.
  • Existing pollen counting methods are unsuitable for Japanese cedar due to its strobilus structure.

Purpose of the Study:

  • To develop an improved and accurate method for counting Japanese cedar pollen grains.
  • To address the limitations of current pollen enumeration techniques for specific plant species.

Main Methods:

  • A precise cell counter was combined with custom-made mesh columns (100- and 20-μm).
  • Male strobili were gently crushed, and debris was efficiently removed using the mesh columns.
  • The method was validated by detecting differences in pollen size and number between two Japanese cedar clones.

Main Results:

  • Successfully quantified pollen from Japanese cedar (Cryptomeria japonica) using the novel method.
  • Demonstrated variability in pollen production between different Japanese cedar clones.
  • The method proved effective in removing debris and counting pollen.

Conclusions:

  • The developed method is effective for Japanese cedar and applicable to other Cupressaceae species.
  • This technique can be adapted for a wider range of plant species, including wheat, without requiring anthesis.
  • Efficient debris removal and precise pollen counting are key advantages of this improved method.