Journal articles: 'Nickel hyperaccumulator plants'

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Gei, Vidiro, Sandrine Isnard, Peter D. Erskine, Guillaume Echevarria, Bruno Fogliani, Tanguy Jaffré, and Antony van der Ent. "A systematic assessment of the occurrence of trace element hyperaccumulation in the flora of New Caledonia." Botanical Journal of the Linnean Society 194, no. 1 (July 21, 2020): 1–22. http://dx.doi.org/10.1093/botlinnean/boaa029.

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Abstract New Caledonia is a global biodiversity hotspot known for its metal hyperaccumulator plants. X-ray fluorescence technology (XRF) has enabled non-destructive and quantitative determination of elemental concentrations in herbarium specimens from the ultramafic flora of the island. Specimens belonging to six major hyperaccumulator families (Cunoniaceae, Phyllanthaceae, Salicaceae, Sapotaceae, Oncothecaceae and Violaceae) and one to four specimens per species of the remaining ultramafic taxa in the herbarium were measured. XRF scanning included a total of c. 11 200 specimens from 35 orders, 96 families, 281 genera and 1484 species (1620 taxa) and covered 88.5% of the ultramafic flora. The study revealed the existence of 99 nickel hyperaccumulator taxa (65 known previously), 74 manganese hyperaccumulator taxa (11 known previously), eight cobalt hyperaccumulator taxa (two known previously) and four zinc hyperaccumulator taxa (none known previously). These results offer new insights into the phylogenetic diversity of hyperaccumulators in New Caledonia. The greatest diversity of nickel hyperaccumulators occur in a few major clades (Malphigiales and Oxalidales) and families (Phyllanthaceae, Salicaceae, Cunoniaceae). In contrast, manganese hyperaccumulation is phylogenetically scattered in the New Caledonian flora.

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Ghasemi, Rasoul, S. Majid Ghaderian, and Sahar Ebrazeh. "Nickel stimulates copper uptake by nickel-hyperaccumulator plants in the genus Alyssum." Australian Journal of Botany 63, no. 2 (2015): 56. http://dx.doi.org/10.1071/bt14219.

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The greatest number of nickel (Ni)-hyperaccumulator plants belonging to the genus Alyssum originate from serpentine soils. They possess physiological mechanisms that enable them tolerate very high internal concentrations of Ni. The specificity of these traits has still not been fully clarified; however, by studying the interactions of different metals, some clues may be given. In the present study, the tolerance, uptake, accumulation and interactions of Ni and copper (Cu) were assessed in a range of Alyssum species. A. bracteatum (Harsin and Paveh populations) and A. inflatum were selected as Ni hyperaccumulators from western Iran. A. montanum and A. saxatile were selected as non-accumulators originating from the Mediterranean region, now being used as ornamental plants. Different concentrations of Ni (0, 100 and 250 µM for hyperaccumulators and 0, 10 and 25 µM for the non-accumulator plants), and Cu (0.5, 1 and 2.5 µM) were employed as treatments in a hydroponic growth experiment with a fully randomised factorial design. No tolerance to high concentrations of Cu was observed in any of the species tested. In the presence of Ni, an increased Cu concentration was observed in both roots and shoots of the Ni-hyperaccumulator plants, but not in the non-accumulators. Furthermore, no negative interaction was detected between Ni and Cu in metal uptake by roots, suggesting that different uptake mechanisms are involved. Stimulation of Cu uptake by Ni in the Ni hyperaccumulators hints that this particular feature may be among the characteristics that enable them to hyperaccumulate Ni, unlike their congeneric non-accumulators.

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Rosatto, Stefano, Mauro Mariotti, Sara Romeo, and Enrica Roccotiello. "Root and Shoot Response to Nickel in Hyperaccumulator and Non-Hyperaccumulator Species." Plants 10, no. 3 (March 9, 2021): 508. http://dx.doi.org/10.3390/plants10030508.

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The soil–root interface is the micro-ecosystem where roots uptake metals. However, less than 10% of hyperaccumulators’ rhizosphere has been examined. The present study evaluated the root and shoot response to nickel in hyperaccumulator and non-hyperaccumulator species, through the analysis of root surface and biomass and the ecophysiological response of the related aboveground biomass. Ni-hyperaccumulators Alyssoides utriculata (L.) Medik. and Noccaea caerulescens (J. Presl and C. Presl) F.K. Mey. and non-hyperaccumulators Alyssum montanum L. and Thlaspi arvense L. were grown in pot on Ni-spiked soil (0–1000 mg Ni kg−1, total). Development of root surfaces was analysed with ImageJ; fresh and dry root biomass was determined. Photosynthetic efficiency was performed by analysing the fluorescence of chlorophyll a to estimate the plants’ physiological conditions at the end of the treatment. Hyperaccumulators did not show a Ni-dependent decrease in root surfaces and biomass (except Ni 1000 mg kg−1 for N. caerulescens). The non-hyperaccumulator A. montanum suffers metal stress which threatens plant development, while the excluder T. arvense exhibits a positive ecophysiological response to Ni. The analysis of the root system, as a component of the rhizosphere, help to clarify the response to soil nickel and plant development under metal stress for bioremediation purposes.

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Jovanović, Gvozden, Dragana Ranđelović, Branislav Marković, and Miroslav Sokić. "Overview of extraction technologies and applications for metals from Balkan hyperaccumulators." Tehnika 77, no. 5 (2022): 543–49. http://dx.doi.org/10.5937/tehnika2205543j.

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Phytomining is a currently developing biotechnology aiming to extract rare and precious metals from naturally enriched or polluted soils with the help of hyperaccumulator plants. On the territory of the Balkans, hyperaccumulating species mainly accumulate elements such as nickel, zinc, thallium, copper and arsenic. This paper provides an overview of the studied technologies around the world for the extraction of these elements from hyperaccumulator's biomass, as well as the areas of potential application of the obtained products. Phytomining has a potential for development in Serbia, and for this purpose it is necessary to utilitized available hyperaccumulators, as well as to investigate technologies for the extraction of metals from their biomass.

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Paul, Adrian L. D., Vidiro Gei, Sandrine Isnard, Bruno Fogliani, Guillaume Echevarria, Peter D. Erskine, Tanguy Jaffré, Jérôme Munzinger, and Antony van der Ent. "Nickel hyperaccumulation in New Caledonian Hybanthus (Violaceae) and occurrence of nickel-rich phloem in Hybanthus austrocaledonicus." Annals of Botany 126, no. 5 (June 24, 2020): 905–14. http://dx.doi.org/10.1093/aob/mcaa112.

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Abstract Background and Aims Hybanthus austrocaledonicus (Violaceae) is a nickel (Ni) hyperaccumulator endemic to New Caledonia. One of the specimens stored at the local herbarium had a strip of bark with a remarkably green phloem tissue attached to the sheet containing over 4 wt% Ni. This study aimed to collect field samples from the original H. austrocaledonicus locality to confirm the nature of the green ‘nickel-rich phloem’ in this taxon and to systematically assess the occurrence of Ni hyperaccumulation in H. austrocaledonicus and Hybanthus caledonicus populations. Methods X-ray fluorescence spectroscopy scanning of all collections of the genus Hybanthus (236 specimens) was undertaken at the Herbarium of New Caledonia to reveal incidences of Ni accumulation in populations of H. austrocaledonicus and H. caledonicus. In parallel, micro-analytical investigations were performed via synchrotron X-ray fluorescence microscopy (XFM) and scanning electron microscopy with X-ray microanalysis (SEM-EDS). Key Results The extensive scanning demonstrated that Ni hyperaccumulation is not a characteristic common to all populations in the endemic Hybanthus species. Synchrotron XFM revealed that Ni was exclusively concentrated in the epidermal cells of the leaf blade and petiole, conforming with the majority of (tropical) Ni hyperaccumulator plants studied to date. SEM-EDS of freeze-dried and frozen-hydrated samples revealed the presence of dense solid deposits in the phloem bundles that contained >8 wt% nickel. Conclusions The occurrence of extremely Ni-rich green phloem tissues appears to be a characteristic feature of tropical Ni hyperaccumulator plants.

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Ghaderian, S. Majid, Rasoul Ghasemi, and Faeze Hajihashemi. "Interaction of nickel and manganese in uptake, translocation and accumulation by the nickel-hyperaccumulator plant, Alyssum bracteatum (Brassicaceae)." Australian Journal of Botany 63, no. 2 (2015): 47. http://dx.doi.org/10.1071/bt14210.

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Serpentine soils are often characterised by high concentrations of heavy metals, high plant diversity and endemism, and, in some cases, the presence of plants that hyperaccumulate nickel (Ni). Nickel uptake by hyperaccumulator plants could potentially be affected by other heavy metals in serpentine soils, such as manganese (Mn), which competes for uptake at roots. The present study investigated interactions between Ni and Mn in metal uptake, translocation and storage in a serpentine-endemic Ni-hyperaccumulator plant, Alyssum bracteatum (Brassicaceae), native to western Iran. The results based on a factorial treatment of seedlings using Ni and Mn and elemental analyses showed that whole shoot and root Ni concentrations were inversely correlated with Mn in the growing medium. Likewise, whole shoot and root Mn concentrations were inversely correlated with Ni in the medium, suggesting competition between Ni and Mn for uptake at roots. No evidence was found for competition between Ni and Mn for translocation between the roots and shoot.

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Brej, Teresa, and Jerzy Fabiszewski. "Plants accumulating heavy metals in the Sudety Mts." Acta Societatis Botanicorum Poloniae 75, no. 1 (2011): 61–68. http://dx.doi.org/10.5586/asbp.2006.009.

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The Sudeten flora consists of some plants we can recognize as heavy metal accumulators. Between others there are: Thlaspi caerulescens, Arabidopsis halleri, Armeria maritima ssp. halleri s.l. and probably the endemic fern Asplenium onopteris var. silesiaca. The authors present the concentrations of some important heavy metals measured in aboveground plant dry weight. The highest concentration of zinc was 8220 ppm (Thlaspi), nickel - 3100 ppm (Thlaspi), lead - 83 ppm (Armeria), copper - 611 ppm (Arabidopsis) and cadmium - 28 ppm (Thlaspi). The concentrations depend rather on species or population specification than on ore deposit quality. There are no typical hyperaccumulator among plants we have examined, but some signs of hyperaccumulation of nickel, zinc and lead could be observed. There are no typical endemic taxa, only Asplenium onopteris var. silesiaca and Armeria maritima ssp. halleri may be recognized as neoendemic taxa, but still of unclear systematic position. During the study we tried to find out why some Sudeten vascular plants do not develop heavy metals hyperaccumulation and why they are rather latent hyperaccumulators. Finally, we suggest to protect some metallicolous areas in spite they are rather territories with low plant biodiversity.

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Boyd, Robert S. "High-nickel insects and nickel hyperaccumulator plants: A review." Insect Science 16, no. 1 (February 2009): 19–31. http://dx.doi.org/10.1111/j.1744-7917.2009.00250.x.

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Rue, Marie, Adrian L. D. Paul, Guillaume Echevarria, Antony van der Ent, Marie-Odile Simonnot, and Jean Louis Morel. "Uptake, translocation and accumulation of nickel and cobalt in Berkheya coddii, a ‘metal crop’ from South Africa." Metallomics 12, no. 8 (2020): 1278–89. http://dx.doi.org/10.1039/d0mt00099j.

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van der Ent, Antony, Kathryn M. Spiers, Dennis Brueckner, Guillaume Echevarria, Mark G. M. Aarts, and Emmanuelle Montargès-Pelletier. "Spatially-resolved localization and chemical speciation of nickel and zinc in Noccaea tymphaea and Bornmuellera emarginata." Metallomics 11, no. 12 (2019): 2052–65. http://dx.doi.org/10.1039/c9mt00106a.

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Plessl, Markus, Diana Rigola, Viivi Hassinen, Mark G. M. Aarts, Henk Schat, and Dieter Ernst. "Transcription Profiling of the Metal-hyperaccumulator Thlaspi caerulescens (J. & C. PRESL)." Zeitschrift für Naturforschung C 60, no. 3-4 (April 1, 2005): 216–23. http://dx.doi.org/10.1515/znc-2005-3-406.

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Abstract Thlaspi caerulescens is a well-studied metal-hyperaccumulator of zinc, cadmium and nickel, belonging to the Brassicaceae family. Moreover it is one of the few hyperaccumulators that occur on different metalliferous soil types, as well as on nonmetalliferous soils. We are interested in the development of systems to improve phytoremediation of metal contaminated soils through improved metal-accumulation. About 1900 cDNAs isolated from T. caerulescens roots were hybridized with reverse transcribed RNA from zinc-treated T. caerulescens plants of two accessions originating from two different soil types. This comparative transcript profiling of T. caerulescens plants resulted in the identification of genes that are affected by heavy metals. The developed microarray proved to be an appropriate tool for a large scale analysis of gene expression in this metal-accumulator species.

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Doroshenko, Alisa, Vitaliy Budarin, Robert McElroy, Andrew J. Hunt, Elizabeth Rylott, Christopher Anderson, Mark Waterland, and James Clark. "Using in vivo nickel to direct the pyrolysis of hyperaccumulator plant biomass." Green Chemistry 21, no. 6 (2019): 1236–40. http://dx.doi.org/10.1039/c8gc03015d.

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Teptina, Anzhelika Yu, and Alexander G. Paukov. "Nickel accumulation by species of Alyssum and Noccaea (Brassicaceae) from ultramafic soils in the Urals, Russia." Australian Journal of Botany 63, no. 2 (2015): 78. http://dx.doi.org/10.1071/bt14265.

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Cool temperate regions have a limited number of species able to accumulate nickel (Ni) and other heavy metals in above-ground tissues. Our study was conducted in order to find accumulators of Ni on serpentine soils in the Middle and Southern Urals. Above-ground tissues of plants as well as soil samples were collected in 10 ultramafic massifs. Our results confirmed hyperaccumulation activity of Alyssum obovatum (C.A.Mey.) Turcz. Three species that appeared to be hemi-accumulators of Ni are Alyssum litvinovii Knjaz., Alyssum tortuosum Willd. and Noccaea thlaspidioides (Pall.) F.K.Mey. All these species are facultative accumulators/hyperaccumulators and exhibit different concentrations of Ni under a range of soil conditions. The highest Ni concentration was found in A. obovatum in Krakinskiy massif (6008 μg·g–1 dry mass), A. tortuosum (1789 μg·g–1) and A. litvinovii (160 μg·g–1) in Khabarninskiy massif, and N. thlaspidioides (741 μg·g–1) in Sugomakskiy massif (Southern Urals). Regression analysis shows statistically significant dependence of Ni concentrations in soil and tissue of both A. obovatum and A. tortuosum. The latter shows a dramatically high difference in the level of accumulation that varies from excluder to 20 μg g–1 Ni to hyperaccumulator levels, suggesting the existence of genetically distinct populations with the ability to vary their accumulation of Ni.

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Tognacchini, Alice, Theresa Rosenkranz, Antony van der Ent, Gaylord Erwan Machinet, Guillaume Echevarria, and Markus Puschenreiter. "Nickel phytomining from industrial wastes: Growing nickel hyperaccumulator plants on galvanic sludges." Journal of Environmental Management 254 (January 2020): 109798. http://dx.doi.org/10.1016/j.jenvman.2019.109798.

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Alves, Ana R. A., Eduardo F. Silva, and Luís A. B. Novo. "Morais Ultramafic Complex: A Survey towards Nickel Phytomining." Resources 8, no. 3 (August 11, 2019): 144. http://dx.doi.org/10.3390/resources8030144.

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Ultramafic areas are critical for nickel (Ni) phytomining due to the high concentration of this element in their soils and the number of hyperaccumulators they harbor. The aim of the present study was to evaluate the potential of the Morais massif, an ultramafic area in Portugal, for phytomining using the hyperaccumulator species Alyssum serpyllifolium subsp. lusitanicum. Soil samples and A. serpyllifolium specimens were collected in four locations of the Morais massif. After determination of Ni concentrations in the samples, the results show that soil pseudo-total Ni concentrations in sites number 1 and 2 are significantly higher than in the soil samples collected in the other two locations, with 1918 and 2092 mg kg−1, respectively. Nickel accumulation is significantly greater in the aerial parts of plants collected at sites 1, 2, and 4, presenting Ni harvestable amount means of 88.36, 93.80, and 95.56 mg per plant, respectively. These results suggest that the sites with highest potential for phytomining are sites 1, 2, and 4. A nickel agromining system in these locations could represent an additional source of income to local farmers, since ultramafic soils have low productivity for agriculture and crop production.

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Guilpain, Mathilde, Baptiste Laubie, Xin Zhang, Jean Louis Morel, and Marie-Odile Simonnot. "Speciation of nickel extracted from hyperaccumulator plants by water leaching." Hydrometallurgy 180 (September 2018): 192–200. http://dx.doi.org/10.1016/j.hydromet.2018.07.024.

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Alfonso González, Dubiel, Rolando Reyes Fernández, Daymara Rodriguez Alonso, and Eduardo Menéndez Álvarez. "Plantas que acumulan metales, su importancia. Leucocroton havanensis Borhidi hiperacumuladora de níquel." Revista de Investigaciones de la Universidad Le Cordon Bleu 6, no. 2 (December 5, 2019): 7–18. http://dx.doi.org/10.36955/riulcb.2019v6n2.001.

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Noell, I., and D. Morris. "Localisation of hyperaccumulated nickel in Stackhousia tryonii using Electron-probe microanalysis." Proceedings, annual meeting, Electron Microscopy Society of America 54 (August 11, 1996): 92–93. http://dx.doi.org/10.1017/s0424820100162922.

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Proton microprobe and electron probe X-ray microanalysis (EPXMA) simultaneously measure and map elemental content, and hence are excellent tools for investigating the distribution and function of elevated Ni levels in hyperaccumulating plants (Ni concentration >1000 μg g−1 dry weight). Five major hypotheses have been proposed for the function of Ni hyperaccumulation. Our research focuses on the hypothesis that Ni defends against herbivore or pathogen attack and examines the movement of Ni from soil through plant to herbivore in Stackhousia tryonii, the only known hyperaccumulator in eastern Australia. Using a JEOL JXA-840-A electron probe microanalyzer with Moran Scientific Analysis software, we located features of high mean atomic number in whole leaves and cross-sections through backscattered-electron imaging (BEI), then we used EPXMA to identify the elements present and to prepare semi-quantitative x-ray maps of seven key elements.

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CECCHI, LORENZO, ISABELLA BETTARINI, ILARIA COLZI, ANDREA COPPI, GUILLAUME ECHEVARRIA, LUIGIA PAZZAGLI, AIDA BANI, CRISTINA GONNELLI, and FEDERICO SELVI. "The genus Odontarrhena (Brassicaceae) in Albania: Taxonomy and Nickel accumulation in a critical group of metallophytes from a major serpentine hot-spot." Phytotaxa 351, no. 1 (May 29, 2018): 1. http://dx.doi.org/10.11646/phytotaxa.351.1.1.

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Metal hyperaccumulator plants represent a unique biological resource for scientific research and practical applications. Though essential, however, an adequate knowledge of the systematics of these plants is often missing. This is the case of Odontarrhena, a large but taxonomically critical group of nickel hyperaccumulators from Eurasia. We present a study on this genus in Albania, to fill a gap in our knowledge of this group from a major centre of diversity of metallicolous flora, and to contribute updated information to the Global Hyperaccumulator Database. Morphological and karyological analyses of material from field collections across all major serpentine outcrops in the country, in different years and seasons, allowed to delimit seven taxa: O. albiflora, O. chalcidica, O. moravensis, O. sibirica, O. decipiens, O. smolikana subsp. glabra and O. rigida. The three latter taxa have been long neglected and were resurrected in view of their clear distinctness, while commonly accepted taxa such as O. bertolonii subsp. scutarina and O. markgrafii were reduced to synonymy of O. chalcidica due to the lack of consistent differentiation. Polyploidy was prevalent, while diploid complements were typical of the two vicariant endemics O. rigida and O. moravensis. Types are indicated or newly designated for each entity, and nomenclatural issues are addressed based on in-depth studies of literature and herbarium material. Revised descriptions, phenology, habitat and distribution data are given for each taxon, as well as original iconographies and chromosome counts. A revised identification key is provided. Shoot nickel concentrations were determined to assess accumulation levels of taxa and populations in natural conditions and their potential for phytoextraction of this metal from the soil. With ca. 23000 and 17000 µg of Ni g-1 of shoot dry weight, respectively, the tetraploids O. chalcidica and O. decipiens were the most promising candidates, especially the latter for its robust habit.

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CECCHI, LORENZO, ISABELLA BETTARINI, ILARIA COLZI, ANDREA COPPI, GUILLAUME ECHEVARRIA, LUIGIA PAZZAGLI, AIDA BANI, CRISTINA GONNELLI, and FEDERICO SELVI. "The genus Odontarrhena (Brassicaceae) in Albania: Taxonomy and Nickel accumulation in a critical group of metallophytes from a major serpentine hot-spot." Phytotaxa 351, no. 1 (May 29, 2018): 1. http://dx.doi.org/10.11646/hytotaxa.351.1.1.

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Metal hyperaccumulator plants represent a unique biological resource for scientific research and practical applications. Though essential, however, an adequate knowledge of the systematics of these plants is often missing. This is the case of Odontarrhena, a large but taxonomically critical group of nickel hyperaccumulators from Eurasia. We present a study on this genus in Albania, to fill a gap in our knowledge of this group from a major centre of diversity of metallicolous flora, and to contribute updated information to the Global Hyperaccumulator Database. Morphological and karyological analyses of material from field collections across all major serpentine outcrops in the country, in different years and seasons, allowed to delimit seven taxa: O. albiflora, O. chalcidica, O. moravensis, O. sibirica, O. decipiens, O. smolikana subsp. glabra and O. rigida. The three latter taxa have been long neglected and were resurrected in view of their clear distinctness, while commonly accepted taxa such as O. bertolonii subsp. scutarina and O. markgrafii were reduced to synonymy of O. chalcidica due to the lack of consistent differentiation. Polyploidy was prevalent, while diploid complements were typical of the two vicariant endemics O. rigida and O. moravensis. Types are indicated or newly designated for each entity, and nomenclatural issues are addressed based on in-depth studies of literature and herbarium material. Revised descriptions, phenology, habitat and distribution data are given for each taxon, as well as original iconographies and chromosome counts. A revised identification key is provided. Shoot nickel concentrations were determined to assess accumulation levels of taxa and populations in natural conditions and their potential for phytoextraction of this metal from the soil. With ca. 23000 and 17000 µg of Ni g-1 of shoot dry weight, respectively, the tetraploids O. chalcidica and O. decipiens were the most promising candidates, especially the latter for its robust habit.

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Feigl, Gábor, Viktória Varga, Árpád Molnár, Panayiotis G. Dimitrakopoulos, and Zsuzsanna Kolbert. "Different Nitro-Oxidative Response of Odontarrhena lesbiaca Plants from Geographically Separated Habitats to Excess Nickel." Antioxidants 9, no. 9 (September 7, 2020): 837. http://dx.doi.org/10.3390/antiox9090837.

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Odontarrhena lesbiaca is an endemic species to the serpentine soils of Lesbos Island (Greece). As a nickel (Ni) hyperaccumulator, it possesses an exceptional Ni tolerance; and it can accumulate up to 0.2–2.4% Ni of its leaves’ dry weight. In our study, O. lesbiaca seeds from two geographically separated study sites (Ampeliko and Loutra) were germinated and grown on control and Ni-containing (3000 mg/kg) soil in a rhizotron system. Ni excess induced significant Ni uptake and translocation in both O. lesbiaca ecotypes and affected their root architecture differently: plants from the Ampeliko site proved to be more tolerant; since their root growth was less inhibited compared to plants originated from the Loutra site. In the roots of the Ampeliko ecotype nitric oxide (NO) was being accumulated, while the degree of protein tyrosine nitration decreased; suggesting that NO in this case acts as a signaling molecule. Moreover, the detected decrease in protein tyrosine nitration may serve as an indicator of this ecotype’s better relative tolerance compared to the more sensitive plants originated from Loutra. Results suggest that Ni hypertolerance and the ability of hyperaccumulation might be connected to the plants’ capability of maintaining their nitrosative balance; yet, relatively little is known about the relationship between excess Ni, tolerance mechanisms and the balance of reactive nitrogen species in plants so far.

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Hazotte, Claire, Baptiste Laubie, Stéphanie Pacault, Olivier Dufaud, and Marie-Odile Simonnot. "Evaluation of the performance of nickel hyperaccumulator plants as combustion fuel." Biomass and Bioenergy 140 (September 2020): 105671. http://dx.doi.org/10.1016/j.biombioe.2020.105671.

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van der Ent, Antony, Peter Erskine, and Sukaibin Sumail. "Ecology of nickel hyperaccumulator plants from ultramafic soils in Sabah (Malaysia)." Chemoecology 25, no. 5 (March 14, 2015): 243–59. http://dx.doi.org/10.1007/s00049-015-0192-7.

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van der Ent, Antony, Guillaume Echevarria, and Mark Tibbett. "Delimiting soil chemistry thresholds for nickel hyperaccumulator plants in Sabah (Malaysia)." Chemoecology 26, no. 2 (February 24, 2016): 67–82. http://dx.doi.org/10.1007/s00049-016-0209-x.

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Cassayre, L., C. Hazotte, B. Laubie, W. M. Carvalho, and M. O. Simonnot. "Combustion of nickel hyperaccumulator plants investigated by experimental and thermodynamic approaches." Chemical Engineering Research and Design 160 (August 2020): 162–74. http://dx.doi.org/10.1016/j.cherd.2020.06.003.

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Massoura, Stamatia Tina, Guillaume Echevarria, Elisabeth Leclerc-Cessac, and Jean Louis Morel. "Response of excluder, indicator, and hyperaccumulator plants to nickel availability in soils." Soil Research 42, no. 8 (2004): 933. http://dx.doi.org/10.1071/sr03157.

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Availability is a key property for the assessment of soil-to-plant transfer of heavy metals. This work was conducted to determine whether the available pool of Ni differs according to the ability of plants to take up and accumulate the metal. An excluder plant species (Triticum aestivum L.), an indicator (Trifolium pratense L.), and 3 populations of the Ni-hyperaccumulator Alyssum murale (Waldst. & Kit.) were grown for 90 days on 4 soils with a gradient of concentrations of total and available Ni. Isotopic exchange methods with 63Ni ions were used to measure the exchangeable soil Ni (E-value, intensity, and capacity factors), to monitor its uptake by plants and to determine the size of the available pool (L-value). Results showed that, for a given soil, the L-values were similar for all plant species, showing that they all access the same Ni exchangeable pool regardless of their Ni uptake capacity. Also, L-values for a given soil were equal to the E-value calculated for a 90-day period, demonstrating that plant Ni originated from the isotopically exchangeable soil Ni. This pool can be accurately and simply determined with the isotopic exchange kinetic methods run on soil–solution batch systems without plants. Moreover, the results indicate that the plant species take up Ni as a response to ‘intensity’, ‘capacity’, and ‘quantity’ soil factors and that E-value alone is not enough to predict plant uptake. This work suggests a uniform behaviour of the plants tested towards soil Ni and may have practical applications in phytoextraction and phytomining, as the plants removed Ni exclusively from the exchangeable pool.

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Pishchik, Veronika, Galina Mirskaya, Elena Chizhevskaya, Vladimir Chebotar, and Debasis Chakrabarty. "Nickel stress-tolerance in plant-bacterial associations." PeerJ 9 (September 29, 2021): e12230. http://dx.doi.org/10.7717/peerj.12230.

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Nickel (Ni) is an essential element for plant growth and is a constituent of several metalloenzymes, such as urease, Ni-Fe hydrogenase, Ni-superoxide dismutase. However, in high concentrations, Ni is toxic and hazardous to plants, humans and animals. High levels of Ni inhibit plant germination, reduce chlorophyll content, and cause osmotic imbalance and oxidative stress. Sustainable plant-bacterial native associations are formed under Ni-stress, such as Ni hyperaccumulator plants and rhizobacteria showed tolerance to high levels of Ni. Both partners (plants and bacteria) are capable to reduce the Ni toxicity and developed different mechanisms and strategies which they manifest in plant-bacterial associations. In addition to physical barriers, such as plants cell walls, thick cuticles and trichomes, which reduce the elevated levels of Ni entrance, plants are mitigating the Ni toxicity using their own antioxidant defense mechanisms including enzymes and other antioxidants. Bacteria in its turn effectively protect plants from Ni stress and can be used in phytoremediation. PGPR (plant growth promotion rhizobacteria) possess various mechanisms of biological protection of plants at both whole population and single cell levels. In this review, we highlighted the current understanding of the bacterial induced protective mechanisms in plant-bacterial associations under Ni stress.

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Wenzel, W. W., M. Bunkowski, M. Puschenreiter, and O. Horak. "Rhizosphere characteristics of indigenously growing nickel hyperaccumulator and excluder plants on serpentine soil." Environmental Pollution 123, no. 1 (May 2003): 131–38. http://dx.doi.org/10.1016/s0269-7491(02)00341-x.

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van der Ent, Antony, Tanguy Jaffré, Laurent L'Huillier, Neil Gibson, and Roger D. Reeves. "The flora of ultramafic soils in the Australia–Pacific Region: state of knowledge and research priorities." Australian Journal of Botany 63, no. 4 (2015): 173. http://dx.doi.org/10.1071/bt15038.

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In the Australia–Pacific Region ultramafic outcrops are both widespread and extensive, covering thousands of km2. Soils derived from ultramafic bedrock impose edaphic challenges and are widely known to host highly distinctive floras with high levels of endemism. In the Australia–Pacific Region, the ultramafics of the island of New Caledonia are famed for harbouring 2150 species of vascular plants of which 83% are endemic. Although the ultramafic outcrops in Western Australia are also extensive and harbour 1355 taxa, only 14 species are known to be endemic or have distributions centred on ultramafics. The ultramafic outcrops in New Zealand and Tasmania are small and relatively species-poor. The ultramafic outcrops in Queensland are much larger and host 553 species of which 18 (or possibly 21) species are endemic. Although New Caledonia has a high concentration of Ni hyperaccumulator species (65), only one species from Western Australia and two species from Queensland have so far been found. No Ni hyperaccumulator species are known from Tasmania and New Zealand. Habitat destruction due to forest clearing, uncontrolled fires and nickel mining in New Caledonia impacts on the plant species restricted to ultramafic soils there. In comparison with the nearby floras of New Guinea and South-east Asia, the flora of the Australia–Pacific Region is relatively well studied through the collection of a large number of herbarium specimens. However, there is a need for studies on the evolution of plant lineages on ultramafic soils especially regarding their distinctive morphological characteristics and in relation to hyperaccumulation.

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Kozhevnikova, A. D., I. V. Seregin, N. V. Zhukovskaya, A. V. Kartashov, and H. Schat. "Histidine-Mediated Nickel and Zinc Translocation in Intact Plants of the Hyperaccumulator Noccaea caerulescens." Russian Journal of Plant Physiology 68, S1 (July 2021): S37—S50. http://dx.doi.org/10.1134/s1021443721070074.

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Durand, A., S. Piutti, M. Rue, J. L. Morel, G. Echevarria, and E. Benizri. "Improving nickel phytoextraction by co-cropping hyperaccumulator plants inoculated by plant growth promoting rhizobacteria." Plant and Soil 399, no. 1-2 (October 2, 2015): 179–92. http://dx.doi.org/10.1007/s11104-015-2691-2.

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Bhatia, Naveen P., Alan J. M. Baker, Kerry B. Walsh, and David J. Midmore. "A role for nickel in osmotic adjustment in drought-stressed plants of the nickel hyperaccumulator Stackhousia tryonii Bailey." Planta 223, no. 1 (October 1, 2005): 134–39. http://dx.doi.org/10.1007/s00425-005-0133-8.

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Dimitrakopoulos, Panayiotis G., Maria Aloupi, Georgios Tetradis, and George C. Adamidis. "Broomrape Species Parasitizing Odontarrhena lesbiaca (Brassicaceae) Individuals Act as Nickel Hyperaccumulators." Plants 10, no. 4 (April 20, 2021): 816. http://dx.doi.org/10.3390/plants10040816.

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The elemental defense hypothesis supports that metal hyperaccumulation in plant tissues serves as a mechanism underpinning plant resistance to herbivores and pathogens. In this study, we investigate the interaction between Odontarrhena lesbiaca and broomrape parasitic species, in the light of the defense hypothesis of metal hyperaccumulation. Plant and soil samples collected from three serpentine sites in Lesbos, Greece were analyzed for Ni concentrations. Phelipanche nowackiana and Phelipanche nana were found to infect O. lesbiaca. In both species, Ni concentration decreased gradually from tubercles to shoots and flowers. Specimens of both species with shoot nickel concentrations above 1000 mg.kg−1 were found, showing that they act as nickel hyperaccumulators. Low values of parasite to O. lesbiaca leaf or soil nickel quotients were observed. Orobanche pubescens growing on a serpentine habitat but not in association with O. lesbiaca had very low Ni concentrations in its tissues analogous to excluder plants growing on serpentine soils. Infected O. lesbiaca individuals showed lower leaf nickel concentrations relative to the non-infected ones. Elevated leaf nickel concentration of O. lesbiaca individuals did not prevent parasitic plants to attack them and to hyperaccumulate metals to their tissues, contrary to predictions of the elemental defense hypothesis.

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Che-Castaldo, Judy P., and David W. Inouye. "Interspecific competition between a non-native metal-hyperaccumulating plant (Noccaea caerulescens, Brassicaceae) and a native congener across a soil-metal gradient." Australian Journal of Botany 63, no. 2 (2015): 141. http://dx.doi.org/10.1071/bt15045.

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Adaptive traits are hypothesised to incur fitness trade-offs, and a classical example is metal-tolerant plants that exhibit reduced competitive ability when grown on low-metal substrates. In the present study, we examined whether metal-hyperaccumulating plants exhibit a similar trade-off, by assessing competition across a soil-metal gradient in the context of phytoremediation. We studied the cadmium- and zinc-hyperaccumulator Noccaea caerulescens (J. Presl & C. Presl) F.K. Mey., which has been introduced to potential remediation sites contaminated with those metals, and the nickel- and zinc-hyperaccumulator Noccaea fendleri subsp. glauca (A. Nelson) Al-Shehbaz & M. Koch, which is native to our study sites. We performed a greenhouse experiment with a response-surface design to quantify their competitive interactions on higher- and lower-metal substrates from each of three mine sites. Overall competitive effects between the species were weak, but we did find evidence of competition on the substrates that supported the highest rates of plant growth and reproduction. Abiotic factors were more limiting than competitive interactions for both species, and both performed better on substrates containing higher zinc, lower cadmium and lower copper concentrations. A complementary field trial supported these findings. Our results also showed that substrates outside of contaminated mine tailings can still contain sufficiently high zinc concentrations to support N. caerulescens, suggesting that the use of these plants for phytoremediation should be monitored to prevent the unintentional establishment of non-native species.

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Ingle, Robert A., Sam T. Mugford, Jonathan D. Rees, Malcolm M. Campbell, and J. Andrew C. Smith. "Constitutively High Expression of the Histidine Biosynthetic Pathway Contributes to Nickel Tolerance in Hyperaccumulator Plants." Plant Cell 17, no. 7 (May 27, 2005): 2089–106. http://dx.doi.org/10.1105/tpc.104.030577.

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Van der Pas, Llewelyn, and Robert A. Ingle. "Towards an Understanding of the Molecular Basis of Nickel Hyperaccumulation in Plants." Plants 8, no. 1 (January 4, 2019): 11. http://dx.doi.org/10.3390/plants8010011.

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Metal hyperaccumulation is a rare and fascinating phenomenon, whereby plants actively accumulate high concentrations of metal ions in their above-ground tissues. Enhanced uptake and root-to-shoot translocation of specific metal ions coupled with an increased capacity for detoxification and sequestration of these ions are thought to constitute the physiological basis of the hyperaccumulation phenotype. Nickel hyperaccumulators were the first to be discovered and are the most numerous, accounting for some seventy-five percent of all known hyperaccumulators. However, our understanding of the molecular basis of the physiological processes underpinning Ni hyperaccumulation has lagged behind that of Zn and Cd hyperaccumulation, in large part due to a lack of genomic resources for Ni hyperaccumulators. The advent of RNA-Seq technology, which allows both transcriptome assembly and profiling of global gene expression without the need for a reference genome, has offered a new route for the analysis of Ni hyperaccumulators, and several such studies have recently been reported. Here we review the current state of our understanding of the molecular basis of Ni hyperaccumulation in plants, with an emphasis on insights gained from recent RNA-Seq experiments, highlight commonalities and differences between Ni hyperaccumulators, and suggest potential future avenues of research in this field.

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Qin, Hui, and Hua Lin. "Advances in remediation of heavy metal contaminated soil and water by Leersia hexandra Swartz." E3S Web of Conferences 194 (2020): 04035. http://dx.doi.org/10.1051/e3sconf/202019404035.

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Heavy metal pollution is extremely harmful to human beings. Looking for an efficient and environmentally friendly treatment method is the focus of current research. Using plants to treat contaminated water and soil has proven to be an effective and environmentally friendly method. Leersia hexandra Swartz is a chromium hyperaccumulator, and it can also enrich copper and nickel. Since the super enrichment characteristics of Leersia hexandra Swartz were discovered, many scholars have poured into the research on Leersia hexandra Swartz. This article will give an overview of the current application status of Leersia hexandra Swartz’s purification of polluted water and soil, analyze the methods and principles used, and discuss the future development direction of Leersia hexandra Swartz’s plant remediation technology.

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BOYD, ROBERT S., MICHAEL A. WALL, and TANGUY JAFFRE. "Nickel levels in arthropods associated with Ni hyperaccumulator plants from an ultramafic site in New Caledonia." Insect Science 13, no. 4 (August 2006): 271–77. http://dx.doi.org/10.1111/j.1744-7917.2006.00094.x.

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Schickler, Hedva, and Hadar Caspi. "Response of antioxidative enzymes to nickel and cadmium stress in hyperaccumulator plants of the genus Alyssum." Physiologia Plantarum 105, no. 1 (January 1999): 39–44. http://dx.doi.org/10.1034/j.1399-3054.1999.105107.x.

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van der Ent, Antony, Guillaume Echevarria, Philip Nti Nkrumah, and Peter D. Erskine. "Frequency distribution of foliar nickel is bimodal in the ultramafic flora of Kinabalu Park (Sabah, Malaysia)." Annals of Botany 126, no. 6 (June 29, 2020): 1017–27. http://dx.doi.org/10.1093/aob/mcaa119.

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Abstract Background and Aims The aim of this study was to test the frequency distributions of foliar elements from a large dataset from Kinabalu Park (Sabah, Malaysia) for departure from unimodality, indicative of a distinct ecophysiological response associated with hyperaccumulation. Methods We collected foliar samples (n = 1533) comprising 90 families, 198 genera and 495 plant species from ultramafic soils, further foliar samples (n = 177) comprising 45 families, 80 genera and 120 species from non-ultramafic soils and corresponding soil samples (n = 393 from ultramafic soils and n = 66 from non-ultramafic soils) from Kinabalu Park (Sabah, Malaysia). The data were geographically (Kinabalu Park) and edaphically (ultramafic soils) constrained. The inclusion of a relatively high proportion (approx. 14 %) of samples from hyperaccumulator species [with foliar concentrations of aluminium and nickel (Ni) >1000 μg g–1, cobalt, copper, chromium and zinc >300 μg g–1 or manganese (Mn) >10 mg g–1] allowed for hypothesis testing. Key Results Frequency distribution graphs for most elements [calcium (Ca), magnesium (Mg) and phosphorus (P)] were unimodal, although some were skewed left (Mg and Mn). The Ni frequency distribution was bimodal and the separation point for the two modes was between 250 and 850 μg g–1. Conclusions Accounting for statistical probability, the established empirical threshold value (>1000 μg g–1) remains appropriate. The two discrete modes for Ni indicate ecophysiologically distinct behaviour in plants growing in similar soils. This response is in contrast to Mn, which forms the tail of a continuous (approximately log-normal) distribution, suggestive of an extension of normal physiological processes.

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Phipps, T., S. L. Tank, J. Wirtz, L. Brewer, A. Coyner, L. S. Ortego, and A. Fairbrother. "Essentiality of nickel and homeostatic mechanisms for its regulation in terrestrial organisms." Environmental Reviews 10, no. 4 (December 1, 2002): 209–61. http://dx.doi.org/10.1139/a02-009.

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Nickel (Ni) is a naturally occurring element with many industrial uses, including in stainless steel, electroplating, pigments, and ceramics. Consequently, Ni may enter the environment from anthropogenic sources, resulting in locally elevated concentrations in soils. However, Ni is a minor essential element, and, therefore, biota have established systems that maintain Ni homeostasis. This paper discusses the role of Ni as an essential element and reviews storage, uptake, and transport systems used to maintain homeostasis within terrestrial biota. The bioaccumulation and distribution of metals in these organisms are also addressed. In all cases, information on Ni essentiality is very limited compared to other essential metals. However, the available data indicate that Ni behaves in a similar manner to other metals. Therefore, inferences specific to Ni may be made from an understanding of metal homeostasis in general. Nevertheless, it is evident that tissue and organ Ni concentrations and requirements vary considerably within and between species, and metal accumulation in various tissues within a single organism differs as well. High rates of Ni deposition around smelters indicate that Ni in acidic soils may reach concentrations that are toxic to plants and soil decomposers. However, with the exception of hyperaccumulator plants, Ni does not biomagnify in the terrestrial food web, suggesting that toxicity to higher trophic levels is unlikely.Key words: nickel, essentiality, homeostasis, bioaccumulation, uptake, transport.

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Baklanov, I. A. "Heterogeneity of epidermal cells in relation to nickel accumulation in hyperaccumulator plants belonging to the genus Alyssum L." Cell and Tissue Biology 5, no. 6 (December 2011): 603–11. http://dx.doi.org/10.1134/s1990519x11060034.

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van der Ent, Antony, and David Mulligan. "Multi-element Concentrations in Plant Parts and Fluids of Malaysian Nickel Hyperaccumulator Plants and some Economic and Ecological Considerations." Journal of Chemical Ecology 41, no. 4 (April 2015): 396–408. http://dx.doi.org/10.1007/s10886-015-0573-y.

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Wood, Bruce W., Rufus Chaney, and Mark Crawford. "Correcting Micronutrient Deficiency Using Metal Hyperaccumulators: Alyssum Biomass as a Natural Product for Nickel Deficiency Correction." HortScience 41, no. 5 (August 2006): 1231–34. http://dx.doi.org/10.21273/hortsci.41.5.1231.

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The existence of nickel (Ni) deficiency in certain horticultural crops merits development of fertilizer products suitable for specific niche uses and for correcting or preventing deficiency problems before marketability and yields are affected. The efficacy of satisfying plant nutritional needs for Ni using biomass of Ni hyperaccumulator species was assessed. Aqueous extraction of Alyssum murale (Waldst. & Kit.) biomass yielded a Ni-enriched extract that, upon spray application, corrects and prevents Ni deficiency in pecan [Carya illinoinensis (Wangenh.) K. Koch]. The Ni-Alyssum biomass extract was as effective at correcting or preventing Ni deficiency as was a commercial Ni-sulfate salt. Foliar treatment of pecan with either source at ≥10 mg·L–1 Ni, regardless of source, prevented deficiency symptoms whereas treatment at less than 10 mg·L–1 Ni was only partially effective. Autumn application of Ni to foliage at 100 mg·L–1 Ni during leaf senescence resulted in enough remobilized Ni to prevent expression of morphologically based Ni deficiency symptoms the following spring. The study demonstrates that micronutrient deficiencies are potentially correctable using extracts of metal-accumulating plants.

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van der Ent, Antony, Ana Ocenar, Romane Tisserand, John B. Sugau, Guillaume Echevarria, and Peter D. Erskine. "Herbarium X-ray fluorescence screening for nickel, cobalt and manganese hyperaccumulator plants in the flora of Sabah (Malaysia, Borneo Island)." Journal of Geochemical Exploration 202 (July 2019): 49–58. http://dx.doi.org/10.1016/j.gexplo.2019.03.013.

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İlhanlı, Yasin, and Erman Ulker. "Determination of Heavy Metal Remediation to Soil from Community Buildings’ Rooftop." Turkish Journal of Agriculture - Food Science and Technology 10, no. 10 (October 28, 2022): 1907–12. http://dx.doi.org/10.24925/turjaf.v10i10.1907-1912.5411.

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Considering the importance of water in the world, the amount of usable water is not sufficient throughout the world, the existing available fresh water resources are not enough, therefore, water shortages may be encountered in the following years. Keeping the quality of water as it is demanded gains more importance than before. Particularly, heavy metals begin to interfere with groundwater resources, and the quantity of pollution growing due to industrialization, and urbanization. In the present study, the quantitative analysis of heavy metals in harvested rainwater from the rooftop of public buildings in Bornova, Izmir is investigated. The results show that a minimum of 5 μg of copper, 4 μg of zinc, 2.69 μg of lead, 0.095 μg of cadmium, 0.55 μg of chromium, 89,7 μg of iron, 0.96 μg of arsenic, 0.0119 μg of mercury and 3.88 μg of nickel should be tossed away for obtaining a liter of potable water. In conclusion, first flush diverters are recommended to convert these non-point pollutants to point source. Thus, municipalities can take necessary measures to protect the environment such as using phytoremediation and hyperaccumulator plants in sewages.

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Frolova, A. S., M. K. Pereverzeva, L. K. Asyakina, Yu V. Golubtsova, and M. A. Osintseva. "Enzymative activity of technogenic surface formations of Kuzbass." Agricultural Science Euro-North-East 23, no. 4 (August 25, 2022): 538–47. http://dx.doi.org/10.30766/2072-9081.2022.23.4.538-547.

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The coal mining is one of the leading industries in the global energy balance. Kuzbass is the main region of Russia that specializes in coal mining. About 60 % of the country's coal is mined there. Coal mining is carried out mainly by the open-pit method. As a result, some 178 thousand hectares ha of disturbed land are formed. Enzymatic activity is an indicator of soil self-repair. The aim of the work was to study the enzymatic activity of technogenic surface formations of the Kuzbass to assess their toxicity and further selection of destructor microorganisms, rhizobacteria and hyperaccumulator plants, which will be further used at the biological stage of recultivation. As objects of research, the samples of technogenic surface formations taken on the territory of the Barzassky and Mokhovsky coal dumps. Enzymatic activity of technogenic surface formations of dumps was: invertase – 2,24 and 2,12 mg of sucrose split 1 g soil in 1 h; nitrite reductase – 0,57 and 0,07 mg reduced NO2- per 1 g soil in 24 h; asparaginase – 71,22 and 60,63 mg NH3 per 1 g soil in 24 h, respectively. When studying the enzymatic activity, it was assumed that the native microflora uses low- and high-molecular hydrocarbons (alkanes, polycyclic aromatic hydrocarbons (PAH), etc.) as carbon sources. The content of mobile forms of heavy metals (HM) in the studied samples exceeds the maximum allowable concentration by 1,2-2,6 times. In the course of statistical analysis, it was revealed that the gross and mobile forms of zinc and copper are nitrite reductase inhibitors, the gross and mobile form of nickel is an asparaginase activator, in technogenic disturbed formations of the studied coal dumps. Nickel is also an invertase inhibitor in the Mokhovsky coal dump.

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Pollard, A. Joseph, Grace L. McCartha, Celestino Quintela-Sabarís, Thomas A. Flynn, Maria K. Sobczyk, and J. Andrew C. Smith. "Intraspecific Variation in Nickel Tolerance and Hyperaccumulation among Serpentine and Limestone Populations of Odontarrhena serpyllifolia (Brassicaceae: Alysseae) from the Iberian Peninsula." Plants 10, no. 4 (April 19, 2021): 800. http://dx.doi.org/10.3390/plants10040800.

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Odontarrhena serpyllifolia (Desf.) Jord. & Fourr. (=Alyssum serpyllifolium Desf.) occurs in the Iberian Peninsula and adjacent areas on a variety of soils including both limestone and serpentine (ultramafic) substrates. Populations endemic to serpentine are known to hyperaccumulate nickel, and on account of this remarkable phenotype have, at times, been proposed for recognition as taxonomically distinct subspecies or even species. It remains unclear, however, to what extent variation in nickel hyperaccumulation within this taxon merely reflects differences in the substrate, or whether the different populations show local adaptation to their particular habitats. To help clarify the physiological basis of variation in nickel hyperaccumulation among these populations, 3 serpentine accessions and 3 limestone accessions were cultivated hydroponically under common-garden conditions incorporating a range of Ni concentrations, along with 2 closely related non-accumulator species, Clypeola jonthlaspi L. and Alyssum montanum L. As a group, serpentine accessions of O. serpyllifolia were able to tolerate Ni concentrations approximately 10-fold higher than limestone accessions, but a continuous spectrum of Ni tolerance was observed among populations, with the least tolerant serpentine accession not being significantly different from the most tolerant limestone accession. Serpentine accessions maintained relatively constant tissue concentrations of Ca, Mg, K, and Fe across the whole range of Ni exposures, whereas in the limestone accessions, these elements fluctuated widely in response to Ni toxicity. Hyperaccumulation of Ni, defined here as foliar Ni concentrations exceeding 1g kg−1 of dry biomass in plants not showing significant growth reduction, occurred in all accessions of O. serpyllifolia, but the higher Ni tolerance of serpentine accessions allowed them to hyperaccumulate more strongly. Of the reference species, C. jonthlaspi responded similarly to the limestone accessions of O. serpyllifolia, whereas A. montanum displayed by far the lowest degree of Ni tolerance and exhibited low foliar Ni concentrations, which only exceeded 1 g kg−1 in plants showing severe Ni toxicity. The continuous spectrum of physiological responses among these accessions does not lend support to segregation of the serpentine populations of O. serpyllifolia as distinct species. However, the pronounced differences in degrees of Ni tolerance, hyperaccumulation, and elemental homeostasis observed among these accessions under common-garden conditions argues for the existence of population-level adaptation to their local substrates.

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Seregin, Ilya V., and Anna D. Kozhevnikova. "Nicotianamine: A Key Player in Metal Homeostasis and Hyperaccumulation in Plants." International Journal of Molecular Sciences 24, no. 13 (June 28, 2023): 10822. http://dx.doi.org/10.3390/ijms241310822.

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Nicotianamine (NA) is a low-molecular-weight N-containing metal-binding ligand, whose accumulation in plant organs changes under metal deficiency or excess. Although NA biosynthesis can be induced in vivo by various metals, this non-proteinogenic amino acid is mainly involved in the detoxification and transport of iron, zinc, nickel, copper and manganese. This review summarizes the current knowledge on NA biosynthesis and its regulation, considers the mechanisms of NA secretion by plant roots, as well as the mechanisms of intracellular transport of NA and its complexes with metals, and its role in radial and long-distance metal transport. Its role in metal tolerance is also discussed. The NA contents in excluders, storing metals primarily in roots, and in hyperaccumulators, accumulating metals mainly in shoots, are compared. The available data suggest that NA plays an important role in maintaining metal homeostasis and hyperaccumulation mechanisms. The study of metal-binding compounds is of interdisciplinary significance, not only regarding their effects on metal toxicity in plants, but also in connection with the development of biofortification approaches to increase the metal contents, primarily of iron and zinc, in agricultural plants, since the deficiency of these elements in food crops seriously affects human health.

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McAlister, Rachel L., Duane A. Kolterman, and A. Joseph Pollard. "Nickel hyperaccumulation in populations of Psychotria grandis (Rubiaceae) from serpentine and non-serpentine soils of Puerto Rico." Australian Journal of Botany 63, no. 2 (2015): 85. http://dx.doi.org/10.1071/bt14337.

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Metal hyperaccumulators are plants that store heavy metals or metalloids in their leaves, often to concentrations much higher than in the soil. Though most occur exclusively on metalliferous soils, some species are facultative, occurring on both metalliferous and nonmetalliferous soils. Psychotria grandis Sw.(Rubiaceae) occurs from Central America through the Caribbean on many soil types, and hyperaccumulates nickel (Ni) on serpentine soils in several localities. In this study, four Puerto Rican populations of P. grandis – two from serpentine soil and two from non-serpentine soil – were examined to compare Ni accumulation between and within populations. Multiple trees were sampled at most sites, with replicate leaves harvested from each tree. Foliar nickel concentrations were measured by atomic absorption spectrometry. Mean Ni concentration differed significantly among the sites, ranging from <165 µg g–1 on non-serpentine soil to >4000 µg g–1 on serpentine soil. There were also significant differences in Ni concentration among trees within sites, with especially wide variation at one of the serpentine sites known to be geologically heterogeneous. Despite these differences in field-collected leaves, a hydroponic common-garden experiment indicated that the Ni accumulation capacities of the populations were approximately equal. Variation in Ni accumulation between and within these populations in the field is likely to result from variation in Ni availability in the soil.

Journal articles on the topic 'Nickel hyperaccumulator plants'

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