Abstract
Transgenic tobacco plants that synthesize alfalfa ferritin in vegetative tissues—either in its processed form in chloroplasts or in the cytoplasmic nonprocessed form—retained photosynthetic function upon free radical toxicity generated by iron excess or paraquat treatment. Progeny of transgenic plants accumulating ferritin in their leaves exhibited tolerance to necrotic damage caused by viral (tobacco necrosis virus) and fungal (Alternaria alternata, Botrytis cinerea) infections. These transformants exhibited normal photosynthetic function and chlorophyll content under greenhouse conditions. We propose that by sequestering intracellular iron involved in generation of the very reactive hydroxyl radicals through a Fenton reaction, ferritin protects plant cells from oxidative damage induced by a wide range of stresses.
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Acknowledgements
The authors thank Keczánné Czakó Zsuzsa for the excellent work during the preparation of the manuscript. This work was supported by the Körber Foundation, Hamburg, Germany.
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Deák, M., Horváth, G., Davletova, S. et al. Plants ectopically expressing the ironbinding protein, ferritin, are tolerant to oxidative damage and pathogens. Nat Biotechnol 17, 192–196 (1999). https://doi.org/10.1038/6198
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DOI: https://doi.org/10.1038/6198
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