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Colangelo MT, Elviri L, Belletti S, Mattarozzi M, Govoni P, Bergonzi C, Careri M, Bettini R, Guizzardi S, Galli C. 3D-printed chitosan scaffolds modified with D-(+) raffinose and enriched with type IV collagen to improve epithelial cell colonization. Biomed Mater 2020; 15:055018. [DOI: 10.1088/1748-605x/ab9552] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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van der Ent A, Spiers KM, Brueckner D, Echevarria G, Aarts MGM, Montargès-Pelletier E. Spatially-resolved localization and chemical speciation of nickel and zinc in Noccaea tymphaea and Bornmuellera emarginata. Metallomics 2020; 11:2052-2065. [PMID: 31651002 DOI: 10.1039/c9mt00106a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Hyperaccumulator plants present the ideal model system for studying the physiological regulation of the essential (and potentially toxic) transition elements nickel and zinc. This study used synchrotron X-ray Fluorescence Microscopy (XFM) elemental imaging and spatially resolved X-ray Absorption Spectroscopy (XAS) to elucidate elemental localization and chemical speciation of nickel and zinc in the hyperaccumulators Noccaea tymphaea and Bornmuellera emarginata (synonym Leptoplax emarginata). The results show that in the leaves of N. tymphaea nickel and zinc have contrasting localization, and whereas nickel is present in vacuoles of epidermal cells, zinc occurs mainly in the mesophyll cells. In the seeds Ni and Zn are similarly localized and strongly enriched in the cotyledons in N. tymphaea. Nickel is strongly enriched in the tip of the radicle of B. emarginata. Noccaea tymphaea has an Fe-rich provascular strand network in the cotyledons of the seed. The chemical speciation of Ni in the seeds of N. tymphaea is unequivocally associated with carboxylic acids, whereas Zn is present as the phytate complex. The spatially resolved spectroscopy did not reveal any spatial variation in chemical speciation of Ni and Zn within the N. tymphaea seed. The dissimilar ecophysiological behaviour of Ni and Zn in N. tymphaea and B. emarginata raises questions about the evolution of hyperaccumulation in these species.
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Affiliation(s)
- Antony van der Ent
- Centre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, Australia.
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Kaneko Y, Tokunaga M, Tanaka K, Atsuzawa K, Nishimura M. Backscattered electron imaging and elemental analysis of rapidly frozen plant cells using variable accelerating voltage. Microscopy (Oxf) 2018; 67:125-128. [PMID: 29373748 DOI: 10.1093/jmicro/dfx133] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 12/19/2017] [Indexed: 11/12/2022] Open
Abstract
Rapidly frozen rosemary leaves were observed at variable accelerating voltages in a low-vacuum scanning electron microscope equipped with a cryo transfer system. After water was sublimated from the fractured face of the leaf, distinct backscattered electron (BSE) images were obtained depending on the accelerating voltages applied. At 5 kV, surface cell wall structure was observed, whereas at 10 and 15 kV chloroplasts lining the inside of the cell wall and membrane were visualized. With energy dispersive X-ray microanalysis, elemental information corresponding to the BSE images was obtained. Besides visualization of the structures and elemental composition close to the living state, information on layers at different depths from the surface could be detected by varying the accelerating voltage in this system.
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Affiliation(s)
- Yasuko Kaneko
- Department of Natural Sciences, Faculty of Education, Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan
| | - Makoto Tokunaga
- Comprehensive Analysis Center for Science, Saitama University, Saitama 338-8570, Japan
| | - Kyoko Tanaka
- Comprehensive Analysis Center for Science, Saitama University, Saitama 338-8570, Japan
| | - Kimie Atsuzawa
- Comprehensive Analysis Center for Science, Saitama University, Saitama 338-8570, Japan
| | - Masako Nishimura
- Science & Medical System Service Div., Hitachi High-Tech Fielding Corporation, Kanagawa 213-0012, Japan
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van der Ent A, Przybyłowicz WJ, de Jonge MD, Harris HH, Ryan CG, Tylko G, Paterson DJ, Barnabas AD, Kopittke PM, Mesjasz-Przybyłowicz J. X-ray elemental mapping techniques for elucidating the ecophysiology of hyperaccumulator plants. THE NEW PHYTOLOGIST 2018; 218:432-452. [PMID: 28994153 DOI: 10.1111/nph.14810] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 07/26/2017] [Indexed: 06/07/2023]
Abstract
Contents Summary 432 I. Introduction 433 II. Preparation of plant samples for X-ray micro-analysis 433 III. X-ray elemental mapping techniques 438 IV. X-ray data analysis 442 V. Case studies 443 VI. Conclusions 446 Acknowledgements 449 Author contributions 449 References 449 SUMMARY: Hyperaccumulators are attractive models for studying metal(loid) homeostasis, and probing the spatial distribution and coordination chemistry of metal(loid)s in their tissues is important for advancing our understanding of their ecophysiology. X-ray elemental mapping techniques are unique in providing in situ information, and with appropriate sample preparation offer results true to biological conditions of the living plant. The common platform of these techniques is a reliance on characteristic X-rays of elements present in a sample, excited either by electrons (scanning/transmission electron microscopy), protons (proton-induced X-ray emission) or X-rays (X-ray fluorescence microscopy). Elucidating the cellular and tissue-level distribution of metal(loid)s is inherently challenging and accurate X-ray analysis places strict demands on sample collection, preparation and analytical conditions, to avoid elemental redistribution, chemical modification or ultrastructural alterations. We compare the merits and limitations of the individual techniques, and focus on the optimal field of applications for inferring ecophysiological processes in hyperaccumulator plants. X-ray elemental mapping techniques can play a key role in answering questions at every level of metal(loid) homeostasis in plants, from the rhizosphere interface, to uptake pathways in the roots and shoots. Further improvements in technological capabilities offer exciting perspectives for the study of hyperaccumulator plants into the future.
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Affiliation(s)
- Antony van der Ent
- Centre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, St Lucia, Qld, 4072, Australia
- Laboratoire Sols et Environnement, UMR 1120, Université de Lorraine-INRA, 54518, Vandoeuvre-lès-Nancy, France
| | - Wojciech J Przybyłowicz
- iThemba LABS, National Research Foundation, PO Box 722, Somerset West, 7129, South Africa
- Faculty of Physics & Applied Computer Science, AGH University of Science and Technology, Kraków, PL30-059, Poland
| | - Martin D de Jonge
- X-ray Fluorescence Microscopy, Australian Synchrotron, Melbourne, Vic, 3168, Australia
| | - Hugh H Harris
- Department of Chemistry, The University of Adelaide, Adelaide, SA, 5005, Australia
| | - Chris G Ryan
- Commonwealth Scientific and Industrial Research Organization, Mineral Resources, Clayton, Vic, 3168, Australia
| | - Grzegorz Tylko
- Department of Cell Biology and Imaging, Institute of Zoology and Biomedical Research, Jagiellonian University, Kraków, PL30-387, Poland
| | - David J Paterson
- X-ray Fluorescence Microscopy, Australian Synchrotron, Melbourne, Vic, 3168, Australia
| | - Alban D Barnabas
- iThemba LABS, National Research Foundation, PO Box 722, Somerset West, 7129, South Africa
| | - Peter M Kopittke
- School of Agriculture and Food Sciences, The University of Queensland, St Lucia, Qld, 4072, Australia
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Visioli G, Vamerali T, Mattarozzi M, Dramis L, Sanangelantoni AM. Combined endophytic inoculants enhance nickel phytoextraction from serpentine soil in the hyperaccumulator Noccaea caerulescens. FRONTIERS IN PLANT SCIENCE 2015; 6:638. [PMID: 26322074 PMCID: PMC4536374 DOI: 10.3389/fpls.2015.00638] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 07/31/2015] [Indexed: 05/04/2023]
Abstract
This study assesses the effects of specific bacterial endophytes on the phytoextraction capacity of the Ni-hyperaccumulator Noccaea caerulescens, spontaneously growing in a serpentine soil environment. Five metal-tolerant endophytes had already been selected for their high Ni tolerance (6 mM) and plant growth promoting ability. Here we demonstrate that individual bacterial inoculation is ineffective in enhancing Ni translocation and growth of N. caerulescens in serpentine soil, except for specific strains Ncr-1 and Ncr-8, belonging to the Arthrobacter and Microbacterium genera, which showed the highest indole acetic acid production and 1-aminocyclopropane-1-carboxylic acid-deaminase activity. Ncr-1 and Ncr-8 co-inoculation was even more efficient in promoting plant growth, soil Ni removal, and translocation of Ni, together with that of Fe, Co, and Cu. Bacteria of both strains densely colonized the root surfaces and intercellular spaces of leaf epidermal tissue. These two bacterial strains also turned out to stimulate root length, shoot biomass, and Ni uptake in Arabidopsis thaliana grown in MS agar medium supplemented with Ni. It is concluded that adaptation of N. caerulescens in highly Ni-contaminated serpentine soil can be enhanced by an integrated community of bacterial endophytes rather than by single strains; of the former, Arthrobacter and Microbacterium may be useful candidates for future phytoremediation trials in multiple metal-contaminated sites, with possible extension to non-hyperaccumulator plants.
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Affiliation(s)
- Giovanna Visioli
- Department of Life Sciences, University of ParmaParma, Italy
- *Correspondence: Giovanna Visioli, Department of Life Sciences, University of Parma, Parco Area delle Scienze 11/A, 43124 Parma, Italy,
| | - Teofilo Vamerali
- Department of Agronomy, Food, Natural Resources, Animals and the Environment, University of PadovaPadova, Italy
| | | | - Lucia Dramis
- Department of Life Sciences, University of ParmaParma, Italy
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