Hyperaccumulators of metal and metalloid trace elements: Facts and fiction
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
How metal hyperaccumulating plants can advance Zn biofortification
TL;DR: First, Zn hyperaccumulation is the result of changes in metal homeostasis networks shared by all higher plants, not strictly dependent on high Zn levels in the soil, and mechanistic insights gained from the study of Znhyperaccumulators can support the breeding and engineering of ZN-biofortified crops.
Journal ArticleDOI
Selenium Accumulation Characteristics and Biofortification Potentiality in Turnip (Brassica rapa var. rapa) Supplied with Selenite or Selenate.
TL;DR: The results indicated that Se (IV) should be more suitable as an artificial Se fertilizer for turnips, although the levels found in most samples in this study could cause selenosis to humans.
Journal ArticleDOI
The first tropical ‘metal farm’: Some perspectives from field and pot experiments
Philip Nti Nkrumah,Romane Tisserand,Rufus L. Chaney,Alan J. M. Baker,Alan J. M. Baker,Alan J. M. Baker,Jean Louis Morel,Romain Goudon,Peter D. Erskine,Guillaume Echevarria,Guillaume Echevarria,Antony van der Ent,Antony van der Ent +12 more
TL;DR: In this article, the authors investigated the soil chemistry of a newly established tropical "metal farm" and elucidated the performance of a prospective "metal crop" species (Phyllanthus rufuschaneyi) to be used in a large-scale tropical Ni agromining program on ultramafic soils in Sabah (Malaysia).
Journal ArticleDOI
Copper and cobalt mobility in soil and accumulation in a metallophyte as influenced by experimental manipulation of soil chemical factors.
Bastien Lange,Olivier Pourret,Pierre Jacques Meerts,Petru Jitaru,Benjamin Cancès,Claude Grison,Michel-Pierre Faucon +6 more
TL;DR: Investigation of the influence of Fe oxides, Mn oxides and organic matter on the Cu and Co mobility in soil and accumulation in the metallophyte Anisopappus chinensis revealed promising perspectives for the use of Ac in Cu-contaminated environment phytoremediation applications.
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Recovering a copper mine soil using organic amendments and phytomanagement with Brassica juncea L.
TL;DR: A 3-month greenhouse experiment was carried out for evaluating the effect of an amendment mixture and mustards on the chemical characteristics of a mine soil and the metal uptake by plants, meaning B. juncea as a potential candidate for phytostabilization of mine soils.
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.
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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.
Journal ArticleDOI
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?