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Extracellular DNA in soil and sediment: fate and ecological relevance

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Abstract

The review discusses origin, state and function of extracellular DNA in soils and sediments. Extracellular DNA can be released from prokaryotic and eukaryotic cells and can be protected against nuclease degradation by its adsorption on soil colloids and sand particles. Laboratory experiments have shown that DNA adsorbed by colloids and sand particles can be taken up by prokaryotic competent cells and be involved in natural transformation. Most of these experiments have been carried out under artificial conditions with pure DNA molecules and pure adsorbing matrices, but in soils and sediments, pure surface-reactive colloids are not present and DNA is present with other cellular components (wall debris, proteins, lipids, RNA, etc.) especially if released after cell lysis. The presence of inorganic compounds and organic molecules on both soil particles and DNA molecules can influence the DNA adsorption, degradation and transformation of competent cells. Extracellular DNA can be used as C, N and P sources by heterotrophic microorganisms and plays a significant role in bacterial biofilm formation. The nucleotides and nucleosides originated from the degradation of extracellular DNA can be re-assimilated by soil microorganisms. Extracellular DNA in soil can be leached and moved by water through the soil profile by capillarity. In this way, the extracellular DNA secreted by a cell can reach a competent bacterial cell far from the donor cell. Finally, the characterisation of extracellular DNA can integrate information on the composition of the microbial community of soil and sediments obtained by analysing intracellular DNA.

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Acknowledgements

This work was supported in part by an Italian Ministry of Agriculture and Forestry (MiPAF) Research Project on “OGM in Agriculture” and a Special Integrative Found for Research (FISR) of the Italian Ministry for University and Research (MIUR) on “Sustainable developments and climate change”.

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  1. Department of Soil Science and Plant Nutrition, University of Florence, Piazzale delle Cascine 28, 50144, Florence, Italy

    G. Pietramellara, J. Ascher, F. Borgogni, M. T. Ceccherini, G. Guerri & P. Nannipieri

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  1. G. Pietramellara
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Pietramellara, G., Ascher, J., Borgogni, F. et al. Extracellular DNA in soil and sediment: fate and ecological relevance. Biol Fertil Soils 45, 219–235 (2009). https://doi.org/10.1007/s00374-008-0345-8

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