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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References
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Journal ArticleDOI
Uptake and accumulation of arsenic by 11 Pteris taxa from southern China.
Haolin Wang,Ming Hung Wong,C. Y. Lan,Alan J. M. Baker,Y. R. Qin,Wen-Sheng Shu,Gongbo Chen,Zhihong Ye +7 more
TL;DR: A field survey at a deserted arsenic (As) mine in Guangxi Province, China showed that the fern Pteris fauriei accumulated over 1000 mg As kg(-1) in its fronds, and revealed a constitutive property of As hyperaccumulation in different populations of P. nervosa, P. oshimensis and P. vittata.
Journal ArticleDOI
Growth response and phytoextraction of copper at different levels in soils by Elsholtzia splendens
TL;DR: Results indicate that phytoextraction of E. splendens can effectively reduce the plant-available Cu level in the polluted soils.
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Accumulation and tolerance characteristics of chromium in a cordgrass Cr-hyperaccumulator, Spartina argentinensis.
TL;DR: Results confirmed that S. argentinensis is a chromium hyperaccumulator and that it may be useful for restoring Cr-contaminated sites, and the transport factors indicated that this species has a higher ability to transfer Cr from roots to tillers at higher Cr concentrations.
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The flora and biogeochemistry of the ultramafic soils of Goiás state, Brazil
TL;DR: The distribution of Ni-values in the Brazilian plant collection is different from that found in the Mediterranean and California, where there is a clear distinction between accumulator and non-accumulator plants: in Brazil the distribution is more continuous, and median Ni concentrations are much greater.