Heavy metal accumulation and tolerance in British populations of the metallophyte <i>Thlaspi caerulescens</i> J. &amp; C. Presl (Brassicaceae)

Baker, A. J. M.; Reeves, Roger D.; Hajar, Abdulrahaman S.

doi:10.1111/j.1469-8137.1994.tb04259.x

Cited by 630 publications

(342 citation statements)

References 23 publications

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“…The high transcript levels of MTP8, MTP11 and other candidate genes with putative functions in Fe, Cu and Mn homeostasis suggest the need to adjust the homeostasis of these metals in Zn hyperaccumulators. In this context, it is interesting to note that in an experiment employing a range of different metal-supplemented nutrient solutions, T. caerulescens had the ability to not only accumulate Zn, Cd and Ni, but also other metal ions, for example Mn and Co in shoots, and Cu, Fe and Pb in roots [55].…”

Section: Uptake Into Root Cellsmentioning

confidence: 99%

Transition metal transport

2007

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Transition metal transporters are of central importance in the plant metal homeostasis network which maintains internal metal concentrations within physiological limits. An overview is given of the functions of known transition metal transporters in the context of the unique chemical properties of their substrates. The modifications of the metal homeostasis network associated with the adaptation to an extreme metalliferous environment are illustrated in two Brassicaceae metal hyperaccumulator model plants based on cross-species transcriptomics studies. In a comparison between higher plants and unicellular algae, hypotheses are generated for evolutionary changes in metal transporter complements associated with the transition to multicellularity.

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Section: Uptake Into Root Cellsmentioning

confidence: 99%

Transition metal transport

2007

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“…A summary of the chemical hydrolyzation reaction is shown below (11,22): (2) Therefore, by hydrolyzing these esters, we may form new binding sites that were previously unavailable to the metal ions. Table 1 shows the milligrams of metal bound by 1.0 g of alfalfa shoot biomass before and after the hydrolyzation reaction.…”

Section: Metal Binding Study With Hydrolyzed Biomassmentioning

confidence: 99%

Use of X-ray Absorption Spectroscopy and Esterification to Investigate Cr(III) and Ni(II) Ligands in Alfalfa Biomass

Tiemann

Gardea‐Torresdey

Gamez

et al. 1998

Environ. Sci. Technol.

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Previously performed studies have shown that alfalfa shoot biomass can bind an appreciable amount of nickel(II) and chromium(III) ions from aqueous solution. Direct and indirect approaches were applied to study the possible mechanisms involved in metal binding by the alfalfa biomass. The direct approach involves investigations of the metal-bound alfalfa shoot biomass by X-ray absorption spectroscopic analysis (XANES and EXAFS). Results from these studies suggest that nickel(II) and chromium(III) binding mostly occurs through coordination with oxygen ligands. Indirect approaches consist of chemical modification of carboxylate groups that have been shown to play an important role in metal binding to the alfalfa biomass. An appreciable decrease in metal binding resulted after acidic methanol esterification of the biomass, indicating that carboxyl groups are entailed in the metal binding by the alfalfa biomass. In addition, base hydrolysis of the alfalfa biomass increased the binding of these metals, which further indicates that carboxyl groups play an important role in the binding of these metal ions from solution. Therefore, by combining two different techniques, our results indicate that carboxylate groups are the major ligands responsible for the binding of nickel(II) and chromium(III) by alfalfa biomass.

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“…The identification of several metalhyperaccumulator plant species (Baker and Brooks, 1989;Baker et al, 1998) demonstrates that the genetic potential exists for successful phytoremediation of contaminated soils. One of the best-known metal hyperaccumulators is Thlaspi caerulescens J&C Presl, which has been reported to have a great potential for extraction of Zn and Cd from metalliferous soils (Reeves and Brooks, 1983;Chaney, 1993;Baker et al, 1994;Brown et al, 1994Brown et al, , 1995aBrown et al, , 1995b. Recently, Brown et al (1995b) reported that from a hydroponic medium, T. caerulescens accumulated more than 25,000 g Zn g Ϫ1 before symptoms of Zn toxicity (i.e.…”

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Altered Zn Compartmentation in the Root Symplasm and Stimulated Zn Absorption into the Leaf as Mechanisms Involved in Zn Hyperaccumulation in Thlaspi caerulescens

1998

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We investigated Zn compartmentation in the root, Zn transport into the xylem, and Zn absorption into leaf cells in Thlaspi caerulescens, a Zn-hyperaccumulator species, and compared them with those of a related nonaccumulator species, Thlaspi arvense. 65 Zncompartmental analysis conducted with roots of the two species indicated that a significant fraction of symplasmic Zn was stored in the root vacuole of T. arvense, and presumably became unavailable for loading into the xylem and subsequent translocation to the shoot. In T. caerulescens, however, a smaller fraction of the absorbed Zn was stored in the root vacuole and was readily transported back into the cytoplasm. We conclude that in T. caerulescens, Zn absorbed by roots is readily available for loading into the xylem. This is supported by analysis of xylem exudate collected from detopped Thlaspi species seedlings. When seedlings of the two species were grown on either low (1 M) or high (50 M) Zn, xylem sap of T. caerulescens contained approximately 5-fold more Zn than that of T. arvense. This increase was not correlated with a stimulated production of any particular organic or amino acid. The capacity of Thlaspi species cells to absorb 65 Zn was studied in leaf sections and leaf protoplasts. At low external Zn levels (10 and 100 M), there was no difference in leaf Zn uptake between the two Thlaspi species. However, at 1 mM Zn 2؉ , 2.2-fold more Zn accumulated in leaf sections of T. caerulescens. These findings indicate that altered tonoplast Zn transport in root cells and stimulated Zn uptake in leaf cells play a role in the dramatic Zn hyperaccumulation expressed in T. caerulescens.Phytoextraction is an emerging technology that involves the use of vascular plants to remediate soils contaminated with heavy metals and/or radionuclides (Nanda Kumar et al., 1995). This approach is based on the ability of higher plants to absorb contaminants from the soil and translocate them to their shoots. The identification of several metalhyperaccumulator plant species (Baker and Brooks, 1989;Baker et al., 1998) demonstrates that the genetic potential exists for successful phytoremediation of contaminated soils. One of the best-known metal hyperaccumulators is Thlaspi caerulescens J&C Presl, which has been reported to have a great potential for extraction of Zn and Cd from metalliferous soils (Reeves and

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Heavy metal accumulation and tolerance in British populations of the metallophyte Thlaspi caerulescens J. & C. Presl (Brassicaceae)

Cited by 630 publications

References 23 publications

Transition metal transport

Transition metal transport

Use of X-ray Absorption Spectroscopy and Esterification to Investigate Cr(III) and Ni(II) Ligands in Alfalfa Biomass

Altered Zn Compartmentation in the Root Symplasm and Stimulated Zn Absorption into the Leaf as Mechanisms Involved in Zn Hyperaccumulation in Thlaspi caerulescens

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