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An improved method for chromosome counting in maize

A Kato1

  • 1Institute of Radiation Breeding, NIAR, MAFF, Ibaraki, Japan. akiokato@irb.affrc.go.jp

Biotechnic & Histochemistry : Official Publication of the Biological Stain Commission
|December 31, 1997
PubMed
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A new method enhances chromosome counting in maize (Zea mays L.) by using specific cold and heat treatments. This technique improves the visualization of countable metaphase chromosomes for accurate ploidy determination.

Area of Science:

  • Plant genetics
  • Cytology
  • Agricultural science

Background:

  • Accurate chromosome counting is essential for understanding plant genetics and breeding.
  • Existing methods for maize (Zea mays L.) chromosome analysis can be challenging due to chromosome dispersion and condensation.

Purpose of the Study:

  • To develop an improved and reliable method for counting chromosomes in maize.
  • To enhance the number of countable metaphase chromosome figures for cytological analysis.

Main Methods:

  • Root tips of maize were subjected to a sequential cold-heat-cold treatment (5°C for 24 hr, 42°C for 5 min, 5°C for 24 hr) prior to fixation.
  • Enzymatic maceration-air drying technique was employed for sample preparation.
  • Preparations were stained with acetic orcein for chromosome visualization.

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Main Results:

  • The described treatment significantly increased the number of condensed and dispersed countable metaphase chromosome figures.
  • The method yields 50-100 countable chromosome figures per preparation in diploid maize under optimal conditions.
  • Factors influencing chromosome dispersion were identified and described.

Conclusions:

  • This improved method provides a more efficient and effective way to count chromosomes in maize.
  • The technique is particularly valuable for determining somatic chromosome numbers in triploid and tetraploid maize lines.
  • Enhanced chromosome visualization facilitates genetic studies and breeding programs in maize.