Metal ion ligands in hyperaccumulating plants

Callahan, Damien L.; Baker, A. J. M.; Kolev, Spas D.; Wedd, Anthony G.

doi:10.1007/s00775-005-0056-7

Cited by 307 publications

(163 citation statements)

References 93 publications

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“…As these compounds can make complex with Cd and be involved in its detoxification and/or translocation as well (Callahan et al 2006), hyperaccumulation of Cd in M. malabathricum and P. cretica had been expected. However, these species did not have high Cd accumulating abilities.…”

Section: Resultsmentioning

confidence: 99%

Amaranthus Tricolor Has the Potential for Phytoremediation of Cadmium‐Contaminated Soils

Murata

Osaki

2009

Communications in Soil Science and Plant Analysis

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Phytoremediation is a developing technology that uses plants to cleanup pollutants in soils. To adopt this technology to cadmium (Cd)-contaminated soils efficiently, a Cd hyperaccumulator with high growth rate and large biomass is required. In the present study, we selected Caryophyllales as a potential clade that might include Cd hyperaccumulators because this clade had a high mean concentration of zinc, which was a same group element as Cd. Three species in Caryophyllales and three species in different clades were grown with Cd. Among them, Amaranthus tricolor showed high accumulating ability for Cd under both water culture and soil culture conditions, whereas Brassica juncea, a known Cd hyperaccumulator, 2 accumulated high concentration of Cd in shoots only under water culture conditions. This result suggests that A. tricolor has Cd-solubilizing ability in rhizosphere. Since A. tricolor has large biomass and high growth rate, this species could be useful for phytoremediation of Cd-contaminated fields.

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Section: Resultsmentioning

confidence: 99%

Amaranthus Tricolor Has the Potential for Phytoremediation of Cadmium‐Contaminated Soils

Murata

Osaki

2009

Communications in Soil Science and Plant Analysis

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“…A chelator that appears to have an important role in metal hyperaccumulation is nicotianamine (NA), which is synthesized from three molecules of S-adenosyl-L L-methionine by nicotianamine synthase (NAS) and can form complexes with several divalent metal cations [63]. Physiologically, NA has been linked with Fe and Cu, but also Ni and Zn homeostasis, and is involved in maintaining the mobility of metal ions in vascular tissues and between cells [2,16,63].…”

Section: The Transport Of Chelators and Metal Chelatesmentioning

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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“…Furthermore, the ability of cv Sahara to maintain low root B concentrations was constitutive and occurred across a wide range of B concentrations (1-5 mM; Hayes and Reid, 2004). This mechanism contrasts with those used by plants that are hyperaccumulators of heavy metals through complexation (Callahan et al, 2006) or those that both exclude and/or sequester metals as complexes by secreting organic acids (e.g. malate or citrate) to grow under adverse environmental conditions.…”

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confidence: 99%

An Investigation of Boron Toxicity in Barley Using Metabolomics

et al. 2006

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Boron (B) is an essential micronutrient that affects plant growth at either deficient or toxic concentrations in soil. The aim of this work was to investigate the adaptation of barley (Hordeum vulgare) plants to toxic B levels and to increase our understanding of B toxicity tolerance mechanisms. We used a metabolomics approach to compare metabolite profiles in root and leaf tissues of an intolerant, commercial cultivar (cv Clipper) and a B-tolerant Algerian landrace (cv Sahara). After exposure to elevated B (200 and 1,000 mM), the number and amplitude of metabolite changes in roots was greater in Clipper than in Sahara. In contrast, leaf metabolites of both cultivars only responded following 1,000 mM treatment, at which B toxicity symptoms (necrosis) were visible. In addition, metabolite levels were dramatically altered in the tips of leaves of the sensitive cultivar Clipper after growth in 1,000 mM B compared to those of Sahara. This correlates with a gradual accumulation of B from leaf base to tip in B-intolerant cultivars. Overall, there were always greater differences between tissue types (roots and leaves) than between the two cultivars. This work has provided insights into metabolic differences of two genetically distinct barley cultivars and information about how they respond metabolically to increasing B levels.Boron (B) is an essential micronutrient for vascular plants. However, when B is present at high concentrations in the soil or ground water, plant growth and reproduction can be affected by B toxicity. B toxicity has been recognized as an important problem limiting crop production in the low rainfall and on highly alkaline and saline soils in regions of Australia, West Asia, and North Africa. Because soil amelioration is impractical, the development of B-tolerant cultivars is a rational solution to the problem.B freely diffuses into the roots as boric acid [B(OH) 3 ; pK a 5 9.25] and accumulates in the cytoplasm as the borate anion [B(OH) 4 2 ] due to pH-dependent interconversion. An inability to exclude B from the roots results in high B concentrations in the tissue. B phytotoxicity manifests itself in a broad range of physiological effects, including decreased shoot and root growth, root cell division and RNA content, reduced leaf chlorophyll, lower photosynthetic rates and stomatal conductance, and reduced levels of lignin and suberin (for review, see Nable et al., 1997). Leaf symptoms of toxicity in barley (Hordeum vulgare) are characterized by interveinal chlorotic and/or necrotic patches, generally at the margins and tips of older leaves. This reflects the accumulation of B at the end of the transpiration stream (Nable et al., 1997). Following long-term exposure to high B concentrations in the soil, overall vegetative plant growth is retarded and this leads to either a reduction in or a complete lack of seed set.B is also an essential nutrient, although its role in plant growth, development, and metabolism remains to be clarified. Originally, B was thought to be essentially immobile in the ...

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Metal ion ligands in hyperaccumulating plants

Cited by 307 publications

References 93 publications

Amaranthus Tricolor Has the Potential for Phytoremediation of Cadmium‐Contaminated Soils

Amaranthus Tricolor Has the Potential for Phytoremediation of Cadmium‐Contaminated Soils

Transition metal transport

An Investigation of Boron Toxicity in Barley Using Metabolomics

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