Hyperaccumulation of nickel by Alyssum corsicum is related to solubility of Ni mineral species

Centofanti, Tiziana; Siebecker, Matthew G.; Chaney, Rufus L.; Davis, Allen P.; Sparks, Donald L.

doi:10.1007/s11104-012-1176-9

Cited by 25 publications

(8 citation statements)

References 37 publications

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“…In a and b, percentages in parentheses represent the percentages of the total variability explained by each axis ments. Normally, increased biomass production, as shown in this study for the fertilized treatment, should be positively related to greater amounts of metal accumulated by the hyperaccumulator plants, as observed by several authors (Centofanti et al 2012;Bani et al 2015). However, a phenomenon of Ni dilution was observed in the plant parts of A. murale in the case of mineral fertilization; in this study, the more the plant biomass increased, the more the Ni concentrations are diluted in plant tissues.…”

Section: Discussionsupporting

confidence: 80%

Crop rotation associating a legume and the nickel hyperaccumulator Alyssum murale improves the structure and biofunctioning of an ultramafic soil

Saad

Kobaissi

Machinet

et al. 2017

Ecological Research

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Nickel (Ni) agromining aims to phytoextract heavy metals using hyperaccumulators whilst at the same time rehabilitating ultramafic soils. After removing the bioavailable metal, ultramafic soils are improved in terms of their agronomic properties with the aim of future agricultural uses. The low fertility of ultramafic soils can be compensated by integrating legumes already used in traditional agro‐systems because of their importance in soil nitrogen enrichment. However, few studies have evaluated the potential profits of legumes on Ni agromining and their potential benefits on soil biological fertility. Here, we characterized the effect of a crop rotation with two plants, a legume (Vicia sativa) and a hyperaccumulator (Alyssum murale), on the phytoextraction efficiency and on soil structure and biofunctioning. A pot experiment was set up in controlled conditions to grow A. murale and four treatments were tested: rotation with V. sativa (Ro), fertilized mono‐culture (FMo), non‐fertilized mono‐culture (NFMo) and bare soil without plants (BS). No significant difference was found between the Ro and NFMo treatments for the dry biomass yield. However, the Ro treatment showed the highest Ni concentrations ([Ni]) in A. murale shoots compared to FMo and NFMo treatments. The Ro treatment plants had more than twice as many leaves [Ni] compared to FMo. Soil physico‐chemical analyses showed that the Ro treatment was better structured and showed the highest presence of bacterial micro‐aggregates, as well as less non‐aggregated particles. Legumes integration in Ni‐agromining systems could be a pioneering strategy to reduce chemical inputs and to improve soil biofunctioning and thus fertility.

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Section: Discussionsupporting

confidence: 80%

Crop rotation associating a legume and the nickel hyperaccumulator Alyssum murale improves the structure and biofunctioning of an ultramafic soil

Saad

Kobaissi

Machinet

et al. 2017

Ecological Research

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“…However, no specific Ni efflux transporter has as yet been identified. When entering xylem vessels, Ni transport is mainly driven by leaf transpiration (Robinson et al 2003;Centofanti et al 2012). The Ni speciation in xylem sap has been studied in a number of hyperaccumulator plants.…”

Section: Xylem Loading and Transport Processesmentioning

confidence: 99%

Nickel hyperaccumulation mechanisms: a review on the current state of knowledge

et al. 2017

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Background Hyperaccumulator plants are unusual plants that accumulate particular metals or metalloids, such as nickel, zinc, cadmium and arsenic, in their living tissues to concentrations that are hundreds to thousands of times greater than what is normal for most plants. The hyperaccumulation phenomenon is rare (exhibited by less than 0.2% of all angiosperms), with most of the ~500 hyperaccumulator species known globally for nickel. Scope This review highlights the contemporary understanding of nickel hyperaccumulation processes, which include root uptake and sequestration, xylem loading and transport, leaf compartmentation and phloem translocation processes. Conclusions Hyperaccumulator plants have evolved highly efficient physiological mechanisms for taking up nickel in their roots followed by rapid translocation and sequestration into the aerial shoots. The uptake of nickel is mainly involved with low affinity transport systems, presumably from the ZIP family. The presence of high concentrations of histidine prevents nickel sequestration in roots. Nickel is efficiently loaded into the xylem, where it mainly presents as Ni 2+. The leaf is the main storage organ, which sequestrates nickel in nonactive sites, e.g. vacuoles and apoplast. Recent studies show that phloem translocates high levels of nickel, which has a strong impact on nickel accumulation in young growing tissues. Nickel hyperaccumulator plants: Discovery and application Nickel (Ni) is the latest element to be considered essential for higher plants (Brown et al. 1987; Marschner 1995; Gerendas et al. 1999), due to its key role in urease, an enzyme that is widely distributed in higher plants (Hogan et al. 1983). The presence of urease prevents the accumulation of urea, which is generated during metabolic processes and is toxic to plants when presents in high concentrations. Apart from its function in urease activation, other physiological functions of Ni are poorly understood in higher plants (Gerendas et al. 1999). Although Ni is an essential micronutrient, its physiological requirement is extremely low. It is shown that 0.1 mg kg −1 or lower is sufficient for seed germination and plant growth (Brown et al. 1987; Gerendas et al. 1999). Hence, Ni deficiency in naturally-grown plants rarely occurs, and the only known case is for the pecan (Wood et al. 2004). Plants usually contain low concentrations of Ni, normally ranging from 0.01-5 mg kg −1 (Welch 1981). In contrast to the low Ni accumulation in normal plants, there is a group of plant species (hyperaccumulators) that can accumulate exceptional concentrations of Ni (>1000 mg kg −1 dry weight) in their living shoots without symptoms of toxicity (Brooks et al. 1977). Amazingly, up to 60.2 and 66.7 g kg −1 foliar Ni concentrations in the Ni hyperaccumulator Phyllanthus × pallidus from Cuba and Alyssum cassium from Turkey have been recorded (Reeves et al. 1996; Reeves and Adıgüzel 2008); while 25% Ni is found in the latex of the New Caledonian tree Pycnandra acuminata, and 16.9% Ni in the phloem sap exu...

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“…High nickel phytoavailability is essential for successful Ni phytomining (Massoura et al 2004), as Ni hyperaccumulator plants take up Ni from the same soil labile Ni pools as 'normal' plants Shallari et al 2001). Nickel hyperaccumulator plants have efficient root absorption mechanisms that deplete the phytoavailable Ni pools to the extent that the soil Ni chemical equilibrium is changed (Centofanti et al 2012;Deng et al 2014). As a result, Ni from non-labile pools replenishes the labile pool over time to maintain equilibration (Centofanti et al 2012), but this is a slow process and depends on the local buffering system (Massoura et al 2004).…”

Section: Soil Ni Availability For 'Metal Crops'mentioning

confidence: 99%

Current status and challenges in developing nickel phytomining: an agronomic perspective

et al. 2016

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Background Nickel (Ni) phytomining operations cultivate hyperaccumulator plants ('metal crops') on Ni-rich (ultramafic) soils, followed by harvesting and incineration of the biomass to produce a high-grade 'bio-ore' from which Ni metal or pure Ni salts are recovered. Scope This review examines the current status, progress and challenges in the development of Ni phytomining agronomy since the first field trial over two decades ago. To date, the agronomy of less than 10 species has been tested, while most research focussed on Alyssum murale and A. corsicum. Nickel phytomining trials have so far been undertaken in Albania, Canada, France, Italy, New Zealand, Spain and USA using ultramafic or Ni-contaminated soils with 0.05-1 % total Ni. Conclusions N, P and K fertilisation significantly increases the biomass of Ni hyperaccumulator plants, and causes negligible dilution in shoot Ni concentration. Organic matter additions have pronounced positive effects on the biomass of Ni hyperaccumulator plants, but may reduce shoot Ni concentration. Soil pH adjustments, S additions, N fertilisation, and bacterial inoculation generally increase Ni phytoavailability, and consequently, Ni yield in 'metal crops'. Calcium soil amendments are necessary because substantial amounts of Ca are removed through the harvesting of 'bio-ore'. Organic amendments generally improve the physical properties of ultramafic soil, and soil moisture has a pronounced positive effect on Ni yield. Repeated 'metal crop' harvesting depletes soil phytoavailable Ni, but also promotes transfer of non-labile soil Ni to phytoavailable forms. Traditional chemical soil extractants used to estimate phytoavailability of trace e l em en ts a re of limi t ed us e t o p re dic t Ni phytoavailability to 'metal crop' species and hence Ni uptake.

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Hyperaccumulation of nickel by Alyssum corsicum is related to solubility of Ni mineral species

Cited by 25 publications

References 37 publications

Crop rotation associating a legume and the nickel hyperaccumulator Alyssum murale improves the structure and biofunctioning of an ultramafic soil

Crop rotation associating a legume and the nickel hyperaccumulator Alyssum murale improves the structure and biofunctioning of an ultramafic soil

Nickel hyperaccumulation mechanisms: a review on the current state of knowledge

Current status and challenges in developing nickel phytomining: an agronomic perspective

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