Cadmium hyperaccumulation and genetic differentiation of Thlaspi caerulescens populations

Basic, Nevena; Salamin, Nicolas; Keller, Catherine; Galland, Nicole; Besnard, Guillaume

doi:10.1016/j.bse.2006.04.001

Cited by 31 publications

(12 citation statements)

References 46 publications

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“…In addition to variations in element concentrations due to the heterogeneous nature of the soil elemental levels (Baker, Reeves & Hajar 1994; Vogel‐Mikuš et al. 2005) and genetic variability of the level of metal hyperaccumulation (Pollard & Baker 1995; Basic et al. 2006), the leaf developmental stage and plant life cycle may influence the results (Perronet, Schwartz & Morel 2003; Pongrac et al.…”

Section: Discussionmentioning

confidence: 99%

Comparison of essential and non‐essential element distribution in leaves of the Cd/Zn hyperaccumulator Thlaspi praecox as revealed by micro‐PIXE

Vogel‐Mikuš

Simčič

Pelicon

et al. 2008

Plant Cell & Environment

107

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A detailed localization of elements in leaf tissues of the field-collected Cd/Zn hyperaccumulator Thlaspi praecox (Brassicaceae) growing at a highly metal-polluted site was determined by micro-proton-induced X-ray emission (micro-PIXE) in order to reveal and compare nutrient and non-essential element accumulation patterns in the case of multiple metal accumulation within particular leaf tissues, including the detailed distribution between apoplast and symplast regions. On the larger scans, the highest concentrations of metals were observed in the epidermis, S and Ca in the palisade mesophyll, Cl in the spongy mesophyll and vascular bundles, and P and K in the vascular bundles. On the more detailed scans, the highest Cd, Pb, Cl and K concentrations were observed in vascular bundle collenchyma. The relative element distribution (%) was calculated based on concentrations of elements in particular leaf tissues and their relative weight portions, indicating that most of the accumulated Zn was located in epidermises, while the majority of Cd and Pb was distributed within the mesophyll. Detailed scans of epidermal/mesophyll tissues revealed that Zn was mainly accumulated and detoxified in the symplast of large vacuolated epidermal cells, Cd in the mesophyll symplast, and Pb in the mesophyll symplast and apoplast.

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Section: Discussionmentioning

confidence: 99%

Comparison of essential and non‐essential element distribution in leaves of the Cd/Zn hyperaccumulator Thlaspi praecox as revealed by micro‐PIXE

Vogel‐Mikuš

Simčič

Pelicon

et al. 2008

Plant Cell & Environment

107

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“…Further, the complex interactions between various nutrients and metals present in high concentrations in effluent might also be responsible for such differential accumulation. Cadmium hyperaccumulation has been discovered in a few plants with the most studied one being Thlaspi caerulescens (Basic et al 2006;Sun et al 2007). Various species of Pteris (Ma et al 2001;Wang et al 2007) and aquatic macrophytes like Ceratophyllum demersum (Robinson et al 2006) are known to be hyperaccumulators of As while the most prominent hyperaccumulator of Cr has been reported as Leersia hexandra (Zhang et al 2007).…”

Section: Discussionmentioning

confidence: 99%

Phytoremediation efficiency of Portulaca tuberosa rox and Portulaca oleracea L. naturally growing in an industrial effluent irrigated area in Vadodra, Gujrat, India

Tiwari

Dwivedi

Mishra

et al. 2008

Environ Monit Assess

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Phytoremediation is a novel, solar-driven and cost-effective technology for the remediation of heavy metal contaminated environments through exploitation of plants ability to accumulate heavy metals in their harvestable shoot parts. In the present investigation, we collected plants of two species of Portulaca i.e. P. tuberosa and P. oleracea from field sites in Vadodra, Gujrat, India. At one site, field was being irrigated with industrial effluent while at other with tube well water. Analysis of heavy metals was performed in industrial effluent, tube well water, soils irrigated with them, and in different parts viz., roots, stem, leaves and flowers of the plant samples. Industrial effluent and soil irrigated with it had very high level of heavy metals (Fe, Zn, Cd, Cr and As) as compared to the tube well water and soil irrigated with that. Plants of both the species growing in effluent irrigated soils showed high accumulation of metals in all plant parts with the maximum being in roots and the least in flowers. Interestingly, both species of Portulaca hyperaccumulated more than one heavy metal viz., Cd, Cr and As. The total shoot concentrations (microg g(-1) dw) of Cd, Cr and As in P. tuberosa were 1,571, 7,957 and 3,118, respectively while in P. oleracea, these were 1,128, 7,552 and 2,476, respectively. Portulaca plants have good biomass and high regeneration potential; hence appear to be suitable for the remediation of effluent (metal) contaminated areas.

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“…The work of Dechamps et al (2008), described above, demonstrated local adaptation of metallicolous populations to their native, metalliferous environment, while suggesting that non-metallicolous populations are not as strongly locally adapted. Other studies aiming to assess genetic signatures of adaptation have suggested that patterns of genetic diversity observed at metal-related candidate loci in Swiss N. caerulescens populations are caused by local adaptation to soil conditions (Basic et al, 2006; Besnard et al, 2009). …”

Section: The Impact Of Population Structure On the Evolution Of “Elemmentioning

confidence: 99%

The current status of the elemental defense hypothesis in relation to pathogens

2013

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Metal hyperaccumulating plants are able to accumulate exceptionally high concentrations of metals, such as zinc, nickel, or cadmium, in their aerial tissues. These metals reach concentrations that would be toxic to most other plant species. This trait has evolved multiple times independently in the plant kingdom. Recent studies have provided new insight into the ecological and evolutionary significance of this trait, by showing that some metal hyperaccumulating plants can use high concentrations of accumulated metals to defend themselves against attack by pathogenic microorganisms and herbivores. Here, we review the evidence that metal hyperaccumulation acts as a defensive trait in plants, with particular emphasis on plant–pathogen interactions. We discuss the mechanisms by which defense against pathogens might have driven the evolution of metal hyperaccumulation, including the interaction of this trait with other forms of defense. In particular, we consider how physiological adaptations and fitness costs associated with metal hyperaccumulation could have resulted in trade-offs between metal hyperaccumulation and other defenses. Drawing on current understanding of the population ecology of metal hyperaccumulator plants, we consider the conditions that might have been necessary for metal hyperaccumulation to be selected as a defensive trait, and discuss the likelihood that these were fulfilled. Based on these conditions, we propose a possible scenario for the evolution of metal hyperaccumulation, in which selective pressure for resistance to pathogens or herbivores, combined with gene flow from non-metallicolous populations, increases the likelihood that the metal hyperaccumulating trait becomes established in plant populations.

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Cadmium hyperaccumulation and genetic differentiation of Thlaspi caerulescens populations

Cited by 31 publications

References 46 publications

Comparison of essential and non‐essential element distribution in leaves of the Cd/Zn hyperaccumulator Thlaspi praecox as revealed by micro‐PIXE

Comparison of essential and non‐essential element distribution in leaves of the Cd/Zn hyperaccumulator Thlaspi praecox as revealed by micro‐PIXE

Phytoremediation efficiency of Portulaca tuberosa rox and Portulaca oleracea L. naturally growing in an industrial effluent irrigated area in Vadodra, Gujrat, India

The current status of the elemental defense hypothesis in relation to pathogens

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