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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Lead Accumulation Ability of Selected Plants of Noccaea spp.
TL;DR: The results are in agreement with those suggesting no Pb hyperaccumulation potential in these plants.
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Combined passivators regulate the heavy metal accumulation and antioxidant response of Brassica chinensis grown in multi-metal contaminated soils.
TL;DR: In this article, a series of combined passivators containing different ratios of Fe-Mn ore, Fe powder, zeolite, bentonite, etc. were designed and used to study their effects on the growth, heavy metal accumulation, and the antioxidant response of Chinese cabbage.
Journal ArticleDOI
Effects of exogenous spermidine on poplar resistance to leaf and root herbivory as affected by soil cadmium stress.
Siyu Qin,Zhengqin Wu,Jiayao Tang,Guoqing Zhu,Gang Chen,Lianghua Chen,Hao Lei,Xuegui Wang,Tianhui Zhu,Tiantian Lin +9 more
TL;DR: In this article, the supplement of exogenous spermidine (Spd) was reported to alleviate metal-induced toxicity in plants while stimulating metal accumulation in plant tissues, and the authors hypothesized that such application will further improve plant resistance to herbivores.
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Potential of Mestha (Hibiscus sabdarifa) for Remediation of Soils Contaminated with Chromium
TL;DR: In this article, the uptake and translocation of chromium (Cr VI) by an important fiber crop, i.e., mestha (Hibiscus sabdarifa), was investigated to evaluate its potential for cleanup of soil contaminated with Cr.
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.
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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?