Cadmium induces DNA damage in tobacco roots, but no DNA damage, somatic mutations or homologous recombination in tobacco leaves
Language English Country Netherlands Media print
Document type Comparative Study, Journal Article, Research Support, Non-U.S. Gov't
PubMed
15066573
DOI
10.1016/j.mrgentox.2003.12.008
PII: S1383571803003681
Knihovny.cz E-resources
- MeSH
- Cadmium pharmacokinetics toxicity MeSH
- Comet Assay MeSH
- Plant Roots drug effects MeSH
- Plant Leaves drug effects MeSH
- Mutation drug effects genetics MeSH
- DNA Damage * MeSH
- Recombination, Genetic drug effects genetics MeSH
- Spectrum Analysis MeSH
- Nicotiana drug effects genetics MeSH
- Dose-Response Relationship, Drug MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Comparative Study MeSH
- Names of Substances
- Cadmium MeSH
The heavy metal cadmium (Cd(2+)) applied on tobacco roots in the form of cadmium chloride, induced significantly higher levels of DNA damage as measured by the cellular Comet assay than did treatment of isolated root nuclei, analyzed by use of the acellular Comet assay. DNA damage induced by Cd(2+) in roots of a transgenic catalase-deficient tobacco line (CAT1AS) was higher than in wild-type tobacco (SR1) roots. In contrast to treatment with the positive control ethyl methanesulphonate, Cd(2+) induced no significant DNA damage in leaf nuclei, and neither somatic mutations, nor homologous recombination as measured by the GUS genereactivation assay, were observed in leaves. Analysis of the accumulation of cadmium by inductively coupled plasma optical emission spectrometry demonstrates that roots accumulate almost 50-fold more cadmium than above-ground parts of the tobacco seedlings. This may explain the absence of Cd(2+) genotoxicity in leaves.
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