Hyperaccumulators of metal and metalloid trace elements: Facts and fiction
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Abstract:
Plants that accumulate metal and metalloid trace elements to extraordinarily high concentrations in their living biomass have inspired much research worldwide during the last decades. Hyperaccumulators have been recorded and experimentally confirmed for elements such as nickel, zinc, cadmium, manganese, arsenic and selenium. However, to date, hyperaccumulation of lead, copper, cobalt, chromium and thallium remain largely unconfirmed. Recent uses of the term in relation to rare-earth elements require critical evaluation. Since the mid-1970s the term ‘hyperaccumulator’ has been used millions of times by thousands of people, with varying degrees of precision, aptness and understanding that have not always corresponded with the views of the originators of the terminology and of the present authors. There is therefore a need to clarify the circumstances in which the term ‘hyperaccumulator’ is appropriate and to set out the conditions that should be met when the terms are used. We outline here the main considerations for establishing metal or metalloid hyperaccumulation status of plants, (re)define some of the terminology and note potential pitfalls. Unambiguous communication will require the international scientific community to adopt standard terminology and methods for confirming the reliability of analytical data in relation to metal and metalloid hyperaccumulators.read more
Citations
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Journal ArticleDOI
Nickel translocation via the phloem in the hyperaccumulator Noccaea caerulescens (Brassicaceae)
Teng-Hao-Bo Deng,Teng-Hao-Bo Deng,Ye-Tao Tang,Antony van der Ent,Antony van der Ent,Thibault Sterckeman,Guillaume Echevarria,Jean Louis Morel,Rongliang Qiu +8 more
TL;DR: Phloem sap of N. caerulescens is enriched in Ni and malate, the majority of which moves upward to young tissues, which suggests phloem translocation may play an important role for Ni accumulation in young leaves of the hyperaccumulator.
Journal ArticleDOI
Increasing purity of ammonium nickel sulfate hexahydrate and production sustainability in a nickel phytomining process
Xin Zhang,Baptiste Laubie,Baptiste Laubie,Vivian Houzelot,Vivian Houzelot,Edouard Plasari,Edouard Plasari,Guillaume Echevarria,Guillaume Echevarria,Marie-Odile Simonnot,Marie-Odile Simonnot +10 more
TL;DR: In this article, a method for the synthesis of a nickel salt, ammonium nickel sulfate hexahydrate (ANSH: Ni(NH4)2(SO4) 2·6H2O), from the biomass of the hyperaccumulator plant Alyssum murale, grown in the Balkans, was presented.
Journal ArticleDOI
Commentary: Toward a more physiologically and evolutionarily relevant definition of metal hyperaccumulation in plants.
Antony van der Ent,Antony van der Ent,Alan J. M. Baker,Alan J. M. Baker,Alan J. M. Baker,Roger D. Reeves,A. Joseph Pollard,Henk Schat +7 more
TL;DR: Several key issues with previous guidelines are highlighted, and a refined definition that is more reflective of both the genetic and physiological mechanisms underlying hyperaccumulation and the evolutionary history of this phenomenon is proposed.
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Metal accumulation and shoot yield of Miscanthus × giganteus growing in contaminated agricultural soils: Insights into agronomic practices
Florien Nsanganwimana,Bertrand Pourrut,Christophe Waterlot,Brice Louvel,Géraldine Bidar,Sonia Labidi,Sonia Labidi,Joël Fontaine,J. Muchembled,A. Lounès-Hadj Sahraoui,H. Fourrier,Francis Douay +11 more
TL;DR: The results demonstrated that the three miscanthus cultivars could be potential candidates for coupling phytostabilization and biomass production on metal-contaminated soils.
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Delimiting soil chemistry thresholds for nickel hyperaccumulator plants in Sabah (Malaysia)
TL;DR: The available evidence primarily supports hypothesis (2) that hyperaccumulators have extremely high nickel uptake efficiency thereby severely depleting nickel and stimulating re-supply of Ni from diffusion from labile Ni pools.
References
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Terrestrial higher plants which hyperaccumulate metallic elements. a review of their distribution, ecology and phytochemistry
TL;DR: Phytochemical studies suggest that hyperaccumulation is closely linked to the mechanism of metal tolerance involved in the successful colonization of metalliferous and otherwise phytotoxic soils.
Journal ArticleDOI
Accumulators and excluders ?strategies in the response of plants to heavy metals
TL;DR: In this paper, two basic strategies of plant response are suggested, accumulators and excluders, which do not generally suppress metal uptake but result in internal detoxification, and indicators are seen as a further mode of response where proportional relationships exist between metal levels in the soil, uptake and accumulation in plant parts.
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A fern that hyperaccumulates arsenic
TL;DR: A hardy, versatile, fast-growing plant that helps to remove arsenic from contaminated soils.
Journal ArticleDOI
Zinc in plants
Martin R. Broadley,Philip J. White,John P. Hammond,Ivan Zelko,Ivan Zelko,Alexander Lux,Alexander Lux +6 more
TL;DR: The dominant fluxes of Zn in the soil-root-shoot continuum are described, including Zn inputs to soils, the plant availability of soluble Zn(2+) at the root surface, and plant uptake and accumulation of ZN.
Book
Phytoremediation of toxic metals : using plants to clean up the environment
Ilya Raskin,Burt D. Ensley +1 more
TL;DR: Why Use Phytoremediation?