Detection of nickeliferous rocks by analysis of herbarium specimens of indicator plants

Brooks, Robert R.; Lee, J; Reeves, Roger D.; Jaffré, Tanguy

doi:10.1016/0375-6742(77)90074-7

Cited by 777 publications

(332 citation statements)

References 6 publications

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“…In contrast, some species of the genera Stanleya (Brassicaceae) and Astragalus (Fabaceae) can hyperaccumulate Se to concentrations of 1,000 to 15,000 mg Se g 21 dry weight in their shoots (0.1%-1.5%) while growing on soils containing only 2 to 10 mg Se g 21 dry weight (Byers, 1935;Virupaksha and Shrift, 1965;Davis, 1972Davis, , 1986Galeas et al, 2007). Hyperaccumulation is a phenomenon where plants accumulate metals or metalloids to much higher concentrations compared with nonaccumulator plants, typically more than 100-fold when growing in their natural habitat on metalliferous soils (Minguzzi and Vergnano, 1948;Jaffré et al, 1976;Brooks et al, 1977). Metals that can be hyperaccumulated by plants include nickel, zinc, cobalt, chromium, molybdenum, cadmium, arsenic, and Se (Reeves and Baker, 2000).…”

mentioning

confidence: 99%

Molecular Mechanisms of Selenium Tolerance and Hyperaccumulation in Stanleya pinnata

Freeman

Tamaoki²,

Stushnoff³

et al. 2010

Plant Physiol.

217

187

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The molecular mechanisms responsible for selenium (Se) tolerance and hyperaccumulation were studied in the Se hyperaccumulator Stanleya pinnata (Brassicaceae) by comparing it with the related secondary Se accumulator Stanleya albescens using a combination of physiological, structural, genomic, and biochemical approaches. S. pinnata accumulated 3.6-fold more Se and was tolerant to 20 mM selenate, while S. albescens suffered reduced growth, chlorosis and necrosis, impaired photosynthesis, and high levels of reactive oxygen species. Levels of ascorbic acid, glutathione, total sulfur, and nonprotein thiols were higher in S. pinnata, suggesting that Se tolerance may in part be due to increased antioxidants and up-regulated sulfur assimilation. S. pinnata had higher selenocysteine methyltransferase protein levels and, judged from liquid chromatography-mass spectrometry, mainly accumulated the free amino acid methylselenocysteine, while S. albescens accumulated mainly the free amino acid selenocystathionine. S. albescens leaf x-ray absorption near-edge structure scans mainly detected a carbon-Se-carbon compound (presumably selenocystathionine) in addition to some selenocysteine and selenate. Thus, S. albescens may accumulate more toxic forms of Se in its leaves than S. pinnata. The species also showed different leaf Se sequestration patterns: while S. albescens showed a diffuse pattern, S. pinnata sequestered Se in localized epidermal cell clusters along leaf margins and tips, concentrated inside of epidermal cells. Transcript analyses of S. pinnata showed a constitutively higher expression of genes involved in sulfur assimilation, antioxidant activities, defense, and response to (methyl)jasmonic acid, salicylic acid, or ethylene. The levels of some of these hormones were constitutively elevated in S. pinnata compared with S. albescens, and leaf Se accumulation was slightly enhanced in both species when these hormones were supplied. Thus, defense-related phytohormones may play an important signaling role in the Se hyperaccumulation of S. pinnata, perhaps by constitutively up-regulating sulfur/Se assimilation followed by methylation of selenocysteine and the targeted sequestration of methylselenocysteine.

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mentioning

confidence: 99%

Molecular Mechanisms of Selenium Tolerance and Hyperaccumulation in Stanleya pinnata

Freeman

Tamaoki²,

Stushnoff³

et al. 2010

Plant Physiol.

217

187

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“…These fascinating plant species, first coined hyperaccumulators by Brooks et al (1977), are loosely categorized as plants that can accumulate metals in the shoot from 100-to 1,000-fold higher than normal, nonaccumulator plants (McGrath et al, 2002). Hyperaccumulating plant species have been identified for a number of heavy metals, including nickel (Ni), zinc (Zn), and cadmium (Cd), as well as for the metalloids selenium and arsenic.…”

mentioning

confidence: 99%

Identification of Thlaspi caerulescens Genes That May Be Involved in Heavy Metal Hyperaccumulation and Tolerance. Characterization of a Novel Heavy Metal Transporting ATPase

2004

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Thlaspi caerulescens is a heavy metal hyperaccumulator plant species that is able to accumulate extremely high levels of zinc (Zn) and cadmium (Cd) in its shoots (30,000 mg g 21 Zn and 10,000 mg g 21 Cd), and has been the subject of intense research as a model plant to gain a better understanding of the mechanisms of heavy metal hyperaccumulation and tolerance and as a source of genes for developing plant species better suited for the phytoremediation of metal-contaminated soils. In this study, we report on the results of a yeast (Saccharomyces cerevisae) complementation screen aimed at identifying candidate heavy metal tolerance genes in T. caerulescens. A number of Thlaspi genes that conferred Cd tolerance to yeast were identified, including possible metal-binding ligands from the metallothionein gene family, and a P-type ATPase that is a member of the P 1B subfamily of purported heavy metal-translocating ATPases. A detailed characterization of the Thlaspi heavy metal ATPase, TcHMA4, demonstrated that it mediates yeast metal tolerance via active efflux of a number of different heavy metals (Cd, Zn, lead [Pb], and copper [Cu]) out of the cell. However, in T. caerulescens, based on differences in tissue-specific and metal-responsive expression of this transporter compared with its homolog in Arabidopsis (Arabidopsis thaliana), we suggest that it may not be involved in metal tolerance. Instead, we hypothesize that it may play a role in xylem loading of metals and thus could be a key player in the hyperaccumulation phenotype expressed in T. caerulescens. Additionally, evidence is presented showing that the C terminus of the TcHMA4 protein, which contains numerous possible heavy metal-binding His and Cys repeats residues, participates in heavy metal binding. When partial peptides from this C-terminal domain were expressed in yeast, they conferred an extremely high level of Cd tolerance and Cd hyperaccumulation. The possibilities for enhancing the metal tolerance and phytoremediation potential of higher plants via expression of these metal-binding peptides are also discussed.There are a small number of terrestrial plant species that not only can tolerate high levels of toxic heavy metals in the soil but also can accumulate those metals to unusually high levels in their shoot biomass. These fascinating plant species, first coined hyperaccumulators by Brooks et al. (1977), are loosely categorized as plants that can accumulate metals in the shoot from 100-to 1,000-fold higher than normal, nonaccumulator plants (McGrath et al., 2002). Hyperaccumulating plant species have been identified for a number of heavy metals, including nickel (Ni), zinc (Zn), and cadmium (Cd), as well as for the metalloids selenium and arsenic. Probably the best known metal hyperaccumulator is Thlaspi caerulescens, a member of the Brassica family that has been the object of interest in the plant biology community for over a century, based on its ability to colonize calamine and serpentine soils containing naturally elevated levels of heavy metals...

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“…The term 'hyperaccumulation,' describing a highly abnormal level of metal accumulation, was first applied by Jaffré et al (1976) in the title of their paper on Ni concentrations in the New Caledonian tree Sebertia acuminata (Sapotaceae), now classified as Pycnandra acuminata. In discussing Ni concentrations in species of Homalium (Salicaceae) and Hybanthus (Violaceae) from various parts of the world, Brooks et al (1977a) used the term to indicate a defined concentration threshold (>1000 μg g À1 ) for Ni. A similar concept was used earlier by Jaffré and Schmid (1974), who referred to certain Ni-rich plants from the ultramafic soils of New Caledonia as 'hypernickelophores,' i.e.…”

Section: Hyperaccumulationmentioning

confidence: 99%

“…Extensive use was made initially of leaf fragments from herbarium collections, but later this gave way to field studies. Brooks et al (1977a) identified several species of Homalium and Hybanthus in New Caledonia as hyperaccumulators. A comprehensive survey of nearly all of the 170 known species of Alyssum (Brooks and Radford 1978;Brooks et al 1979) established the existence of 48 Ni hyperaccumulators, all in one section (Odontarrhena) of the genus, distributed from Portugal across Mediterranean Europe to Turkey, Armenia, Iraq, Iran, and Russia.…”

Section: Nickelmentioning

confidence: 99%

Global Distribution and Ecology of Hyperaccumulator Plants

Reeves¹,

Ent²,

Baker³

2017

Agromining: Farming for Metals

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A large body of analytical data is available on the inorganic composition of many thousands of plant species, for which typical concentration ranges have been tabulated for major, minor, and trace elements. These elements include those that have been shown essential for plant growth, as well as others that lack this status, at least universally. Metalliferous soils, having abnormally high concentrations of some of the elements that are generally present only at minor (e.g. 200-2000 μg g À1 ) or trace (e.g. 0.1-200 μg g À1 ) levels, vary widely in their effects on plants and have attracted increasing attention during the last 50 years. The effects depend on the species, the relevant elements, and soil characteristics that influence the availability of metals to plants. Some of these soils are toxic to all or most higher plants. Others have hosted the development of specialized plant communities consisting of a restricted and locally characteristic range of metal-tolerant species. These plants often show a slightly elevated concentration of the elements with which the soil is enriched, but in places a species exhibits extreme accumulation of one or more of these elements, to a concentration level that may be hundreds or even thousands of times greater than that usually found in plants on the most common soils. These plants, now widely referred to as hyperaccumulators, are a remarkable resource for many types of fundamental scientific investigation (plant systematics, ecophysiology, biochemistry, genetics, and molecular biology) and for applications such as phytoremediation and agromining, and are discussed in detail below.

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Detection of nickeliferous rocks by analysis of herbarium specimens of indicator plants

Cited by 777 publications

References 6 publications

Molecular Mechanisms of Selenium Tolerance and Hyperaccumulation in Stanleya pinnata

Molecular Mechanisms of Selenium Tolerance and Hyperaccumulation in Stanleya pinnata

Identification of Thlaspi caerulescens Genes That May Be Involved in Heavy Metal Hyperaccumulation and Tolerance. Characterization of a Novel Heavy Metal Transporting ATPase

Global Distribution and Ecology of Hyperaccumulator Plants

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