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Probing The Structure And Dynamics Of Nucleosomes Using Atomic Force Microscopy Imaging
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Karyotype analysis of buckwheat using atomic force microscopy.

Suresh Neethirajan1, Tamaki Hirose, Junichi Wakayama

  • 1Biological and Nanoscale Systems Group, Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6445, USA. suresh.neethirajan@gmail.com

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|July 14, 2011
PubMed
Summary

Atomic Force Microscopy (AFM) enabled novel karyotype analysis of buckwheat chromosomes without staining. This technique accurately classified common and Tartarian buckwheat, revealing evolutionary differences.

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Area of Science:

  • Cytogenetics
  • Plant Biology
  • Nanotechnology

Background:

  • Traditional karyotype analysis relies on staining and banding, which can introduce subjective inconsistencies.
  • Accurate chromosome classification is crucial for understanding plant evolution and genetics.

Purpose of the Study:

  • To develop and apply Atomic Force Microscopy (AFM) for unstained karyotype analysis and classification of buckwheat chromosomes.
  • To compare the karyomorphology of common buckwheat (Fagopyrum esculentum) and Tartarian buckwheat (Fagopyrum tartaricum).

Main Methods:

  • Chromosomes were isolated from root tissues using enzymatic maceration.
  • Air-dried chromosomes were analyzed using three-dimensional Atomic Force Microscopy (AFM).
  • Morphological characterization included size, volume, arm lengths, and ratios.

Main Results:

  • AFM provided detailed surface topography and 3D volume measurements of buckwheat chromosomes.
  • F. esculentum chromosomes exhibited volumes of 1.08-2.09 μm3, while F. tartaricum chromosomes ranged from 0.49-0.78 μm3.
  • AFM measurements allowed for accurate karyomorphological classification, overcoming limitations of conventional methods.

Conclusions:

  • AFM offers a precise and objective method for plant chromosome analysis, eliminating staining-related subjectivity.
  • Karyomorphological data suggest that common buckwheat (F. esculentum) represents an older evolutionary lineage than Tartarian buckwheat (F. tartaricum).
  • This study presents the first cytological karyotype of buckwheat utilizing AFM.