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
Induced Plant Accumulation of Lithium
TL;DR: In this paper, the authors examined the suitability of several plant species including Brassica napus and Helianthus annuus as Li-accumulators under controlled conditions.
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Habitat heterogeneity in the pseudometallophyte Arabidopsis halleri and its structuring effect on natural variation of zinc and cadmium hyperaccumulation
Hélène Frérot,Nina-Coralie Hautekèete,Isabelle Decombeix,Marie-Hélène Bouchet,Anne Créach,Pierre Saumitou-Laprade,Yves Piquot,Maxime Pauwels +7 more
TL;DR: Soil zinc and cadmium concentrations showed the most contrasting effects on phenotypic divergence between metalliferous and non-metaliferous habitats, however, other abiotic parameters may affect the variation of zinc or Cadmium hyperaccumulation within each habitat type.
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Effects of plant species and traits on metal treatment and phytoextraction in stormwater bioretention.
TL;DR: Results indicate that root biomass affected effluent metal concentrations more strongly and support was obtained for using hyperaccumulators in BRS to remove metals from filter material.
Journal ArticleDOI
Multiple mechanisms of heavy metal tolerance are differentially expressed in ecotypes of Artemisia fragrans
Esmira Alirzayeva,Günter Neumann,Walter J. Horst,Yagut Allahverdiyeva,André Specht,Valida Alizade +5 more
TL;DR: Differential expression of HM exclusion strategies in Artemisia ecotypes are demonstrated and suggest Cd and Cu exclusion from the photosynthetically active tissues as a major tolerance mechanism of the AP ecotype.
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Metal-resistant rhizobacteria isolates improve Mucuna deeringiana phytoextraction capacity in multi-metal contaminated soils from a gold mining area
Cácio Luiz Boechat,Patricia Giovanella,Magno Batista Amorim,Enilson Luiz Saccol de Sá,Flávio Anastácio de Oliveira Camargo +4 more
TL;DR: The translocation and bioconcentration factors for M. deeringiana characterize it as a promising candidate to phytostabilize multi-metal contaminated 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.
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?