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
Effect of hyperaccumulating plant cover composition and rhizosphere associated bacteria on the efficiency of nickel extraction from soil.
Pierre Lucisine,Guillaume Echevarria,Thibault Sterckeman,Jessica Vallance,Patrice Rey,Emile Benizri +5 more
TL;DR: The highest values of microbial biomass were obtained with the multispecies cover and a consistent production of auxin compounds by bacterial communities was measured, which emphasized the role of rhizosphere bacteria.
Journal ArticleDOI
Marigold (Tagetes erecta): The Potential Value in the Phytoremediation of Chromium
Lívia Cristina Coelho,Ana Rosa Ribeiro Bastos,Paulo Jorge de Pinho,Guilherme Amaral de Souza,Janice Guedes de Carvalho,Viviane Amaral Toledo Coelho,Luiz C.A. Oliveira,Rimena R Domingues,Valdemar Faquin +8 more
TL;DR: In this paper, the potential value of marigold (Tagetes erecta) in the phytoremediation of chromium has been investigated, and a randomized experimental design involved the exposure of plants to nutrient solutions containing 0.12 mmol L−1 Cr(III).
Journal ArticleDOI
Accumulation of Cr, Cd, Pb, Cu, and Zn by plants in tanning sludge storage sites: opportunities for contamination bioindication and phytoremediation
TL;DR: Plant species, including Phragmites australis, Zephyranthes candida, Cynodon dactylon, and Alternanthera philoxeroides accumulated moderate-high concentrations of Cr and other metals, which could make them good bioindicators of heavy metal pollution.
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Guidelines for a phytomanagement plan by the phytostabilization of mining wastes
TL;DR: In this article, the authors proposed guidelines for the phytomanagement of mine wastes, which is a new concept, still very rarely used especially in Morocco, and they conducted a detailed analysis of this approach and demonstrated its usefulness and benefits over the long term.
Journal ArticleDOI
Trace element bioavailability, yield and seed quality of rapeseed (Brassica napus L.) modulated by biochar incorporation into a contaminated technosol.
Lilian Marchand,Céline Pelosi,María Reyes González-Centeno,Anne Maillard,Alain Ourry,William Galland,Pierre-Louis Teissedre,Jean-Jacques Bessoule,Sébastien Mongrand,Annette Morvan-Bertrand,Qinzhong Zhang,Claire Grosbellet,Valérie Bert,Nadège Oustriere,Michel Mench,Sophie Brunel-Muguet +15 more
TL;DR: The biochar incorporation into this technosol did not promote Cd, Cu and Zn phytoextraction by rapeseed and its potential oilseed production, but increased the solubility of several metal(loid)s.
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?