Plant Molecular Biology Reporter

, Volume 15, Issue 2, pp 148–153

Isolation of milligram quantities of nuclear DNA from tomato (Lycopersicon esculentum), A plant containing high levels of polyphenolic compounds

  • Daniel G. Peterson
  • Kevin S. Boehm
  • Stephen M. Stack
Protocols

Abstract

We have developed a protocol for isolating milligram quantities of highly purified DNA from tomato nuclei. The protocol utilizes fresh seedlings or leaves without freezing. Tissues are treated with ethyl ether, thoroughly washed, and placed in a buffer containing the nuclear-stabilizing agent 2-methyl-1,4-pentanediol. Nuclei are liberated from tomato cells by homogenization in a Waring blender. The interaction of nuclear DNA with oxidized polyphenols is inhibited by compounds that adsorb polyphenols or prevent oxidation reactions. Chloroplasts and mitochondria are preferentially eliminated with Triton X-100. Nuclei are concentrated using a Percoll gradient and lysed with SDS. DNA is subsequently purified by RNase and protease digestions and phenol/chloroform extractions. The isolated DNA is essentially free of polyphenols and other major contaminants based upon its lack of coloration, A260/A280 ratio, digestibility with restriction enzymes, melting profile, and reassociation properties.

Keywords

tomato Lycopersicon esculentum polyphenols tannins DNA nuclei 

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Copyright information

© International Society for Plant Molecular Biology 1997

Authors and Affiliations

  • Daniel G. Peterson
    • 1
  • Kevin S. Boehm
    • 1
  • Stephen M. Stack
    • 1
  1. 1.Department of BiologyColorado State UniversityFort CollinsUSA

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