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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References
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Phytomining for nickel, thallium and gold
Christopher Anderson,Robert R. Brooks,Alessandro Chiarucci,Cher LaCoste,Marc Leblanc,Brett Robinson,R Simcock,Robert B. Stewart +7 more
TL;DR: The first phytomining experiments were carried out in California using the Ni-hyperaccumulator Streptanthus polygaloides and it was found that a yield of 100 kg=ha of sulphur-free Ni could be produced as mentioned in this paper.
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Do Arabidopsis halleri from nonmetallicolous populations accumulate zinc and cadmium more effectively than those from metallicolous populations
TL;DR: Results show that metallicolous and nonmetallicolous populations of Arabidopsis halleri have the same ability to accumulate Zn and Cd but that neither population type is able to accumulate Pb.
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A comparison of the rhizosphere-based method with DTPA, EDTA, CaCl2, and NaNO3 extraction methods for prediction of bioavailability of metals in soil to barley.
TL;DR: The rhizosphere-based method is the most robust approach for evaluation of bioavailability of metals in soil to barley and was suitable for acidic, neutral and near alkaline soils.
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In search of the Holy Grail – a further step in understanding metal hyperaccumulation?
Journal ArticleDOI
Chromium availability in ultramafic soils from New Caledonia.
TL;DR: Cr concentrations were larger in well aerated colluvial soils, where high levels of Mn-oxides are able to oxidize Cr(III) to Cr(VI), than in piedmont soil where the Mn-oxide content is lower, or in alluvial soil from the lowlands, where waterlogging occurs.