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Updated: Feb 15, 2026

Assaying Proteasomal Degradation in a Cell-free System in Plants
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DNA Diffusion Assay Applied to Plant Cells.

Anca Macovei1, Mattia Donà2, Daniela Carbonera1

  • 1Department of Biology and Biotechnology 'Lazzaro Spallanzani', University of Pavia, Pavia, Italy.

Methods in Molecular Biology (Clifton, N.J.)
|January 15, 2018
PubMed
Summary

The DNA diffusion assay effectively detects programmed cell death (PCD) and necrosis in plant cells by analyzing nuclear DNA fragmentation. This optimized protocol ensures reliable assessment of cell death events using nuclear morphology and DNA diffusion patterns.

Keywords:
DNA diffusionNecrosisNuclear morphologyPlant cellsProgrammed cell death

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Area of Science:

  • Plant Biology
  • Cell Biology
  • Molecular Biology

Background:

  • Programmed cell death (PCD) and necrosis are critical cellular processes in plants.
  • Assessing these events often relies on analyzing nuclear morphology and DNA integrity.
  • Existing methods may require optimization for broad applicability across plant tissues.

Purpose of the Study:

  • To describe an optimized protocol for the DNA diffusion assay.
  • To enable sensitive and reliable assessment of programmed cell death (PCD) and necrosis in various plant cells and tissues.
  • To detail critical steps for successful experimental execution.

Main Methods:

  • Isolation of nuclei from plant material.
  • Embedding nuclei in agarose followed by lysis in alkaline buffers.
  • Staining diffused DNA fragments with fluorescent dyes like DAPI (4',6-diamidino-2-phenylindole) for visualization.

Main Results:

  • The DNA diffusion assay reveals characteristic halo patterns around nuclei due to DNA fragmentation.
  • Alkali-labile sites in DNA facilitate the diffusion of small DNA pieces in the agarose gel.
  • The optimized protocol demonstrates applicability across different plant cell and tissue types.

Conclusions:

  • The DNA diffusion assay is a simple, sensitive, and reliable method for evaluating plant cell death.
  • This optimized protocol provides a robust tool for researchers studying programmed cell death (PCD) and necrosis in plants.
  • Successful application relies on careful adherence to critical procedural steps.