Abstract
Plants release a multitude of organic compounds into the rhizosphere, some of which are flavonoids. These products of secondary metabolism are mainly studied for their antioxidant properties and for their role in the establishment of rhizobium-legume symbiosis; however, it has been recently demonstrated that flavonoids can also affect nutrient availability through soil chemical changes. This review will give an overview of the types and amounts of flavonoids released by roots of different plant species, as well as summarize the available knowledge on root exudation mechanisms. Subsequently, factors influencing their release will be reported, and the methodological approaches used in the literature will be critically described. Finally, the direct contribution of plant-borne flavonoids on the nitrogen, phosphorous and iron availability into the rhizosphere will be discussed.
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Acknowledgements
We would like to thank Dr. Kirsty Agnoli for English corrections and Prof. Hans Lambers (University of Western Australia) for his critical revision of the manuscript which also greatly benefited from the detailed and constructive criticisms of four anonymous reviewers. Research was supported by grant from Italian M.U.R.S.T.
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Cesco, S., Neumann, G., Tomasi, N. et al. Release of plant-borne flavonoids into the rhizosphere and their role in plant nutrition. Plant Soil 329, 1–25 (2010). https://doi.org/10.1007/s11104-009-0266-9
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DOI: https://doi.org/10.1007/s11104-009-0266-9