Abstract:Until now, there has been little data on the isotope fractionation of nickel (Ni) in higher plants and how this can be affected by plant Ni and zinc (Zn) homeostasis. A hydroponic cultivation was conducted to investigate the isotope fractionation of Ni and Zn during plant uptake and translocation processes. The nonaccumulator Thlaspi arvense, the Ni hyperaccumulator Alyssum murale and the Ni and Zn hyperaccumulator Noccaea caerulescens were grown in low (2 μM) and high (50 μM) Ni and Zn solutions. Results show… Show more
“…Isotopically lighter Zn in shoots relative to roots was first reported by Weiss et al, (2005) and similar features are observed in the Ni isotopic studies of plants (Deng et al, 2014;Estrade et 795 al., 2015). In a comparison of shoot-root isotopic differences of Zn and Ni in the same species, Deng et al (2014) noted a more modest fractionations for Ni.…”
supporting
confidence: 74%
“…It should be re-emphasised that most of the species analysed for their Ni isotopic compositions are hyperaccumulators, in which Ni is anomalously enriched shoots relative to roots. The two non-accumulators studied so far show contrasting behaviour, 800 with both positive, Thlapsi arvensa (Deng et al, 2014) and negative, Euphorbia spinosa values of Δ 60/58 Ni shoots-roots , see Figure 9. Some variability in Δ 60/58 Ni between roots, stems and leaves may be related to the growth stage of the plants .…”
mentioning
confidence: 95%
“…In a comparison of shoot-root isotopic differences of Zn and Ni in the same species, Deng et al (2014) noted a more modest fractionations for Ni. They attributed this to higher Ni mobility in plants relative to Zn.…”
mentioning
confidence: 95%
“…Laboratory experiments (Deng et al, 2014) and a field study reported isotopic analyses for several Ni hyperaccumulators, together with a non-accumulator species for comparison. In all but one case, the plants have net isotopically light compositions relative to dissolved Ni in growth media or inferred for soil water (Δ 60/58 Ni bulk plant-solution = -0.06 to -0.8), see 780 Figure 9.…”
“…Isotopically lighter Zn in shoots relative to roots was first reported by Weiss et al, (2005) and similar features are observed in the Ni isotopic studies of plants (Deng et al, 2014;Estrade et 795 al., 2015). In a comparison of shoot-root isotopic differences of Zn and Ni in the same species, Deng et al (2014) noted a more modest fractionations for Ni.…”
supporting
confidence: 74%
“…It should be re-emphasised that most of the species analysed for their Ni isotopic compositions are hyperaccumulators, in which Ni is anomalously enriched shoots relative to roots. The two non-accumulators studied so far show contrasting behaviour, 800 with both positive, Thlapsi arvensa (Deng et al, 2014) and negative, Euphorbia spinosa values of Δ 60/58 Ni shoots-roots , see Figure 9. Some variability in Δ 60/58 Ni between roots, stems and leaves may be related to the growth stage of the plants .…”
mentioning
confidence: 95%
“…In a comparison of shoot-root isotopic differences of Zn and Ni in the same species, Deng et al (2014) noted a more modest fractionations for Ni. They attributed this to higher Ni mobility in plants relative to Zn.…”
mentioning
confidence: 95%
“…Laboratory experiments (Deng et al, 2014) and a field study reported isotopic analyses for several Ni hyperaccumulators, together with a non-accumulator species for comparison. In all but one case, the plants have net isotopically light compositions relative to dissolved Ni in growth media or inferred for soil water (Δ 60/58 Ni bulk plant-solution = -0.06 to -0.8), see 780 Figure 9.…”
“…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
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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.