Abstract
Some trace elements are essential for plants but become toxic at high concentration. Remarkably, about 500 plant species worldwide are able to accumulate tremendous amounts of metals in their leaves and are therefore called metal hyperaccumulators. In the context of sustainable development, there is a regain of interest for metal hyperaccumulation mechanisms that may become instrumental for improving metal phytoextraction from contaminated soils to produce metals with a lower net impact on the environment. In addition, studying the molecular mechanisms of hyperaccumulation in diverse plant species is necessary in order to understand the evolution of this extreme and complex adaptation trait. Our current knowledge of metal hyperaccumulation is mostly based on the analysis of a few species from the Brassicaceae family, and suggests that the underlying mechanisms result from an exaggeration of basic mechanisms involved in metal homeostasis. However, the development of Next Generation Sequencing technologies opens today the possibility for studying new hyperaccumulator species that therefore may reveal more diversity in these mechanisms. The goal of this chapter is to provide background information on metal hyperaccumulation and give a clear picture of what we know currently about the molecular mechanisms involved in this trait. We also attempt to outline for the reader the future scientific challenges that this field of research is facing.
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Acknowledgments
We thank members of our laboratories for critical reading of the manuscript. The research of SM and VSGT is supported by the French National Research Agency (ANR-13-ADAP-0004) and by CNRS (Defi Enviromics Gene-4-Chem). Funding to MH is from the “Fonds de la Recherche Scientifique–FNRS” (FRFC-2.4583.08, PDR-T.0206.13, MIS-F.4511.16, CDR J.0009.17), the University of Liège (SFRD-12/03) and the Belgian Program on Interuniversity Poles of Attraction (IAP no. P6/19). MH is a Research Associate of the FNRS.
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Merlot, S., Sanchez Garcia de la Torre, V., Hanikenne, M. (2018). Physiology and Molecular Biology of Trace Element Hyperaccumulation. In: Van der Ent, A., Echevarria, G., Baker, A., Morel, J. (eds) Agromining: Farming for Metals. Mineral Resource Reviews. Springer, Cham. https://doi.org/10.1007/978-3-319-61899-9_6
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