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Chen Y, Li Y, Luo G, Luo C, Xiao Z, Lu Y, Xiang Z, Hou Z, Xiao Q, Zhou Y, Tang Q. Gene identification, expression analysis, and molecular docking of SAT and OASTL in the metabolic pathway of selenium in Cardamine hupingshanensis. PLANT CELL REPORTS 2024; 43:148. [PMID: 38775862 PMCID: PMC11111505 DOI: 10.1007/s00299-024-03227-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Accepted: 05/02/2024] [Indexed: 05/25/2024]
Abstract
KEY MESSAGE Identification of selenium stress-responsive expression and molecular docking of serine acetyltransferase (SAT) and O-acetyl serine (thiol) lyase (OASTL) in Cardamine hupingshanensis. A complex coupled with serine acetyltransferase (SAT) and O-acetyl serine (thiol) lyase (OASTL) is the key enzyme that catalyzes selenocysteine (Sec) synthesis in plants. The functions of SAT and OASTL genes were identified in some plants, but it is still unclear whether SAT and OASTL are involved in the selenium metabolic pathway in Cardamine hupingshanensis. In this study, genome-wide identification and comparative analysis of ChSATs and ChOASTLs were performed. The eight ChSAT genes were divided into three branches, and the thirteen ChOASTL genes were divided into four branches by phylogenetic analysis and sequence alignment, indicating the evolutionary conservation of the gene structure and its association with other plant species. qRT-PCR analysis showed that the ChSAT and ChOASTL genes were differentially expressed in different tissues under various selenium levels, suggesting their important roles in Sec synthesis. The ChSAT1;2 and ChOASTLA1;2 were silenced by the VIGS system to investigate their involvement in selenium metabolites in C. hupingshanensis. The findings contribute to understanding the gene functions of ChSATs and ChOASTLs in the selenium stress and provide a reference for further exploration of the selenium metabolic pathway in plants.
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Affiliation(s)
- Yushan Chen
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Hubei Minzu University, Enshi, 44500, China
- Hubei Key Laboratory of Selenium Resource Research and Biological Application, Hubei Minzu University, Enshi, 44500, China
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, 44500, China
| | - Yao Li
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, 44500, China
| | - Guoqiang Luo
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, 44500, China
| | - Cihang Luo
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, 44500, China
| | - Zhijing Xiao
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, 44500, China
| | - Yanke Lu
- Hubei Key Laboratory of Selenium Resource Research and Biological Application, Hubei Minzu University, Enshi, 44500, China
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, 44500, China
| | - Zhixin Xiang
- Hubei Key Laboratory of Selenium Resource Research and Biological Application, Hubei Minzu University, Enshi, 44500, China
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, 44500, China
| | - Zhi Hou
- Hubei Key Laboratory of Selenium Resource Research and Biological Application, Hubei Minzu University, Enshi, 44500, China
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, 44500, China
| | - Qiang Xiao
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Hubei Minzu University, Enshi, 44500, China
- College of Forestry and Horticulture, Hubei Minzu University, Enshi, 44500, China
| | - Yifeng Zhou
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Hubei Minzu University, Enshi, 44500, China.
- Hubei Key Laboratory of Selenium Resource Research and Biological Application, Hubei Minzu University, Enshi, 44500, China.
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, 44500, China.
| | - Qiaoyu Tang
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Hubei Minzu University, Enshi, 44500, China.
- College of Forestry and Horticulture, Hubei Minzu University, Enshi, 44500, China.
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Zeng X, Luo G, Fan Z, Xiao Z, Lu Y, Xiao Q, Hou Z, Tang Q, Zhou Y. Whole genome identification, molecular docking and expression analysis of enzymes involved in the selenomethionine cycle in Cardamine hupingshanensis. BMC PLANT BIOLOGY 2024; 24:199. [PMID: 38500044 PMCID: PMC10949594 DOI: 10.1186/s12870-024-04898-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 03/10/2024] [Indexed: 03/20/2024]
Abstract
BACKGROUND The selenomethionine cycle (SeMTC) is a crucial pathway for the metabolism of selenium. The basic bioinformatics and functions of four enzymes involved in the cycle including S-adenosyl-methionine synthase (MAT), SAM-dependent methyltransferase (MTase), S-adenosyl-homocysteine hydrolase (SAHH) and methionine synthase (MTR), have been extensively reported in many eukaryotes. The identification and functional analyses of SeMTC genes/proteins in Cardamine hupingshanensis and their response to selenium stress have not yet been reported. RESULTS In this study, 45 genes involved in SeMTC were identified in the C. hupingshanensis genome. Phylogenetic analysis showed that seven genes from ChMAT were clustered into four branches, twenty-seven genes from ChCOMT were clustered into two branches, four genes from ChSAHH were clustered into two branches, and seven genes from ChMTR were clustered into three branches. These genes were resided on 16 chromosomes. Gene structure and homologous protein modeling analysis illustrated that proteins in the same family are relatively conserved and have similar functions. Molecular docking showed that the affinity of SeMTC enzymes for selenium metabolites was higher than that for sulfur metabolites. The key active site residues identified for ChMAT were Ala269 and Lys273, while Leu221/231 and Gly207/249 were determined as the crucial residues for ChCOMT. For ChSAHH, the essential active site residues were found to be Asn87, Asp139 and Thr206/207/208/325. Ile204, Ser111/329/377, Asp70/206/254, and His329/332/380 were identified as the critical active site residues for ChMTR. In addition, the results of the expression levels of four enzymes under selenium stress revealed that ChMAT3-1 genes were upregulated approximately 18-fold, ChCOMT9-1 was upregulated approximately 38.7-fold, ChSAHH1-2 was upregulated approximately 11.6-fold, and ChMTR3-2 genes were upregulated approximately 28-fold. These verified that SeMTC enzymes were involved in response to selenium stress to varying degrees. CONCLUSIONS The results of this research are instrumental for further functional investigation of SeMTC in C. hupingshanensis. This also lays a solid foundation for deeper investigations into the physiological and biochemical mechanisms underlying selenium metabolism in plants.
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Affiliation(s)
- Xixi Zeng
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Enshi, China, Enshi
- Hubei Key Laboratory of Selenium Resource Research and Biological Application, Enshi, China, 44500
- College of Forestry and Horticulture, Hubei Minzu University, Enshi, China, 44500
| | - Guoqiang Luo
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, China, 44500
| | - Zhucheng Fan
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, China, 44500
| | - Zhijing Xiao
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Enshi, China, Enshi
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, China, 44500
| | - Yanke Lu
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Enshi, China, Enshi
| | - Qiang Xiao
- College of Forestry and Horticulture, Hubei Minzu University, Enshi, China, 44500
| | - Zhi Hou
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, China, 44500
| | - Qiaoyu Tang
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Enshi, China, Enshi.
- College of Forestry and Horticulture, Hubei Minzu University, Enshi, China, 44500.
- Hubei Engineering Research Center of Selenium Food Nutrition and Health Intelligent Technology, Enshi, China, 44500.
| | - Yifeng Zhou
- Hubei Key Laboratory of Selenium Resource Research and Biological Application, Enshi, China, 44500.
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, China, 44500.
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Guo Y, Xu S, Yan S, Lei S, Gao Y, Chen K, Shi X, Yuan M, Yao H. The translocation and fractionation of rare earth elements (REEs) via the phloem in Phytolacca americana L. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:114044-114055. [PMID: 37858022 DOI: 10.1007/s11356-023-30473-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Accepted: 10/10/2023] [Indexed: 10/21/2023]
Abstract
Rare earth elements (REEs) are considered to be emerging contaminants due to their widespread use and lack of recycling. Phytolacca americana L. has great potential for REEs phytoextraction. Our understanding of REEs in P. americana focuses mostly on root absorption and xylem translocation, but the role of phloem translocation has received little attention. In this research, the translocation and fractionation of REEs from phloem to organs in P. americana were investigated. In addition, the effect of organic acids in the REEs translocation via phloem exudates was also examined. The results showed that REEs could transport bidirectionally via the phloem, and 86% of REEs exported from old leaves could move downwards to the root, whereas only 14% of them transported upwards to the young leaves. Heavy rare earth elements (HREEs) enrichment was found in the REEs fractionation processes both from phloem to leaf and from stem to root, indicating that HREEs were preferentially transferred not only down to roots, but also up to the young leaves. The concentration of oxalic acid in phloem exudates was much higher than other organic acids. 94.7% oxalic acid in phloem exudates was preferred to combine with REEs, especially HREEs. Additionally, the concentrations of HREEs had a high positive correlation with oxalic acid in phloem exudates, which demonstrated oxalic acid may play a significant role in the long-distance transport of HREEs in phloem. In conclusion, HREEs have higher translocation ability than light rare earth elements (LREEs) in both xylem and phloem of P. americana. As far as we know, this is the first report focused on the phloem translocation and redistribution of REEs in P. americana, which provides a valuable understanding of the mechanism for phytoremediation of REEs contaminated soils.
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Affiliation(s)
- Yingying Guo
- Key Laboratory of Green Chemical Engineering Process of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, 430205, China
| | - Shengwen Xu
- Key Laboratory of Green Chemical Engineering Process of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, 430205, China
| | - Shengpeng Yan
- Key Laboratory of Green Chemical Engineering Process of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, 430205, China
| | - Shihan Lei
- Key Laboratory of Green Chemical Engineering Process of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, 430205, China
| | - Yuan Gao
- Key Laboratory of Green Chemical Engineering Process of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, 430205, China
| | - Keyi Chen
- Key Laboratory of Green Chemical Engineering Process of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, 430205, China
| | - Xiaoyu Shi
- Key Laboratory of Green Chemical Engineering Process of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, 430205, China
| | - Ming Yuan
- Key Laboratory of Green Chemical Engineering Process of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
| | - Huaiying Yao
- Key Laboratory of Green Chemical Engineering Process of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, 430205, China
- Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
- Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, Ningbo Urban Environment Observation and Research Station, Chinese Academy of Sciences, Ningbo, China
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van der Ent A, Salinitro M, Brueckner D, Spiers KM, Montanari S, Tassoni A, Schiavon M. Differences and similarities in selenium biopathways in Astragalus, Neptunia (Fabaceae) and Stanleya (Brassicaceae) hyperaccumulators. ANNALS OF BOTANY 2023; 132:349-361. [PMID: 37602676 PMCID: PMC10583200 DOI: 10.1093/aob/mcad110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 08/17/2023] [Indexed: 08/22/2023]
Abstract
BACKGROUND AND AIMS Selenium hyperaccumulator species are of primary interest for studying the evolution of hyperaccumulation and for use in biofortification because selenium is an essential element in human nutrition. In this study, we aimed to determine whether the distributions of selenium in the three most studied hyperaccumulating taxa (Astragalus bisulcatus, Stanleya pinnata and Neptunia amplexicaulis) are similar or contrasting, in order to infer the underlying physiological mechanisms. METHODS This study used synchrotron-based micro-X-ray fluorescence (µXRF) techniques to visualize the distribution of selenium and other elements in fresh hydrated plant tissues of A. racemosus, S. pinnata and N. amplexicaulis. KEY RESULTS Selenium distribution differed widely in the three species: in the leaves of A. racemosus and N. amplexicaulis selenium was mainly concentrated in the pulvini, whereas in S. pinnata it was primarilylocalized in the leaf margins. In the roots and stems of all three species, selenium was absent in xylem cells, whereas it was particularly concentrated in the pith rays of S. pinnata and in the phloem cells of A. racemosus and N. amplexicaulis. CONCLUSIONS This study shows that Astragalus, Stanleya and Neptunia have different selenium-handling physiologies, with different mechanisms for translocation and storage of excess selenium. Important dissimilarities among the three analysed species suggest that selenium hyperaccumulation has probably evolved multiple times over under similar environmental pressures in the US and Australia.
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Affiliation(s)
- Antony van der Ent
- Laboratory of Genetics, Wageningen University and Research, Wageningen, The Netherlands
- Centre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, Brisbane, Queensland, Australia
- Université de Lorraine, INRAE, LSE, F-54000 Nancy, France
| | - Mirko Salinitro
- Department of Biological Geological and Environmental Sciences, University of Bologna, Bologna, Italy
| | | | | | - Sofia Montanari
- Department of Biological Geological and Environmental Sciences, University of Bologna, Bologna, Italy
| | - Annalisa Tassoni
- Department of Biological Geological and Environmental Sciences, University of Bologna, Bologna, Italy
| | - Michela Schiavon
- Department of Agricultural, Forest and Food Sciences (DISAFA), University of Turin, Turin, Italy
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Corzo Remigio A, Harris HH, Paterson DJ, Edraki M, van der Ent A. Chemical transformations of arsenic in the rhizosphere-root interface of Pityrogramma calomelanos and Pteris vittata. Metallomics 2023; 15:mfad047. [PMID: 37528060 PMCID: PMC10427965 DOI: 10.1093/mtomcs/mfad047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 07/31/2023] [Indexed: 08/03/2023]
Abstract
Pityrogramma calomelanos and Pteris vittata are cosmopolitan fern species that are the strongest known arsenic (As) hyperaccumulators, with potential to be used in the remediation of arsenic-contaminated mine tailings. However, it is currently unknown what chemical processes lead to uptake of As in the roots. This information is critical to identify As-contaminated soils that can be phytoremediated, or to improve the phytoremediation process. Therefore, this study identified the in situ distribution of As in the root interface leading to uptake in P. calomelanos and P. vittata, using a combination of synchrotron micro-X-ray fluorescence spectroscopy and X-ray absorption near-edge structure imaging to reveal chemical transformations of arsenic in the rhizosphere-root interface of these ferns. The dominant form of As in soils was As(V), even in As(III)-dosed soils, and the major form in P. calomelanos roots was As(III), while it was As(V) in P. vittata roots. Arsenic was cycled from roots growing in As-rich soil to roots growing in control soil. This study combined novel analytical approaches to elucidate the As cycling in the rhizosphere and roots enabling insights for further application in phytotechnologies to remediated As-polluted soils.
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Affiliation(s)
- Amelia Corzo Remigio
- Centre for Water in the Minerals Industry, Sustainable Minerals Institute, The University of Queensland, Brisbane, Australia
| | - Hugh H Harris
- Department of Chemistry, The University of Adelaide, Adelaide, Australia
| | | | - Mansour Edraki
- Centre for Water in the Minerals Industry, Sustainable Minerals Institute, The University of Queensland, Brisbane, Australia
| | - Antony van der Ent
- Centre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, Brisbane, Australia
- Laboratory of Genetics, Wageningen University and Research, Wageningen, The Netherlands
- Laboratoire Sols et Environnement, INRAE, Université de Lorraine, Nancy, France
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Montanari S, Salinitro M, Simoni A, Ciavatta C, Tassoni A. Foraging for selenium: a comparison between hyperaccumulator and non-accumulator plant species. Sci Rep 2023; 13:10661. [PMID: 37391494 PMCID: PMC10313833 DOI: 10.1038/s41598-023-37249-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 06/19/2023] [Indexed: 07/02/2023] Open
Abstract
Selenium (Se) hyperaccumulators are a unique group of plants that can accumulate this element in their aerial parts at concentrations exceeding 100 mg kgDW-1. These plants actively search for Se in the soil, a phenomenon known as root foraging, reported to date only by few studies. In this study, the effect of localized Se enrichment, in the form of selenite and selenate, was investigated on the root architecture of two Se-hyperaccumulators (Stanleya pinnata and Astragalus bisulcatus) and two non-accumulators (Brassica juncea and Medicago sativa). Rhizoboxes were divided into two halves: one half was filled with control soil while the other with selenate or selenite (30 mg kgDW-1) spiked soil. Seedling were transferred into the interface of the two soils and allowed to grow for three weeks under controlled light and temperature conditions. Staneya pinnata exhibited equal root density in both halves of the rhizobox when grown in control/control and selenite/control soil treatments. However, in the presence of selenate, S. pinnata developed 76% of the roots towards the selenate-enriched half, indicating an active root foraging. In contrast, A. bisulcatus and the non-accumulators B. juncea and M. sativa did not show any preferential distribution of roots. This study revealed that only S. pinnata showed the ability to detect and forage for Se when provided as selenate. Non-accumulators did not show any morphological or Se-accumulation difference associated with the presence of Se in soil in either form.
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Affiliation(s)
- Sofia Montanari
- Department of Biological Geological and Environmental Sciences, University of Bologna, Via Irnerio 42, 40126, Bologna, Italy
| | - Mirko Salinitro
- Department of Biological Geological and Environmental Sciences, University of Bologna, Via Irnerio 42, 40126, Bologna, Italy.
| | - Andrea Simoni
- Department of Agricultural and Food Sciences, University of Bologna, Viale Giuseppe Fanin 40, 40127, Bologna, Italy
| | - Claudio Ciavatta
- Department of Agricultural and Food Sciences, University of Bologna, Viale Giuseppe Fanin 40, 40127, Bologna, Italy
- Centro Interdipartimentale di Ricerca Industriale sull'Agroalimentare, University of Bologna, Via Quinto Bucci 336, 47521, Cesena, Italy
| | - Annalisa Tassoni
- Department of Biological Geological and Environmental Sciences, University of Bologna, Via Irnerio 42, 40126, Bologna, Italy
- Centro Interdipartimentale di Ricerca Industriale sull'Agroalimentare, University of Bologna, Via Quinto Bucci 336, 47521, Cesena, Italy
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Pinto Irish K, Harvey MA, Harris HH, Aarts MGM, Chan CX, Erskine PD, van der Ent A. Micro-analytical and molecular approaches for understanding the distribution, biochemistry, and molecular biology of selenium in (hyperaccumulator) plants. PLANTA 2022; 257:2. [PMID: 36416988 PMCID: PMC9684236 DOI: 10.1007/s00425-022-04017-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/06/2021] [Accepted: 10/22/2022] [Indexed: 06/16/2023]
Abstract
Micro-analytical techniques to untangle Se distribution and chemical speciation in plants coupled with molecular biology analysis enable the deciphering of metabolic pathways responsible for Se tolerance and accumulation. Selenium (Se) is not essential for plants and is toxic at high concentrations. However, Se hyperaccumulator plants have evolved strategies to both tolerate and accumulate > 1000 µg Se g-1 DW in their living above-ground tissues. Given the complexity of the biochemistry of Se, various approaches have been adopted to study Se metabolism in plants. These include X-ray-based techniques for assessing distribution and chemical speciation of Se, and molecular biology techniques to identify genes implicated in Se uptake, transport, and assimilation. This review presents these techniques, synthesises the current state of knowledge on Se metabolism in plants, and highlights future directions for research into Se (hyper)accumulation and tolerance. We conclude that powerful insights may be gained from coupling information on the distribution and chemical speciation of Se to genome-scale studies to identify gene functions and molecular mechanisms that underpin Se tolerance and accumulation in these ecologically and biotechnologically important plants species. The study of Se metabolism is challenging and is a useful testbed for developing novel analytical approaches that are potentially more widely applicable to the study of the regulation of a wide range of metal(loid)s in hyperaccumulator plants.
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Affiliation(s)
- Katherine Pinto Irish
- The University of Queensland, Sustainable Minerals Institute, Centre for Mined Land Rehabilitation, Brisbane, QLD, 4072, Australia
| | - Maggie-Anne Harvey
- The University of Queensland, Sustainable Minerals Institute, Centre for Mined Land Rehabilitation, Brisbane, QLD, 4072, Australia
| | - Hugh H Harris
- Department of Chemistry, The University of Adelaide, Adelaide, SA, Australia
| | - Mark G M Aarts
- Laboratory of Genetics, Wageningen University and Research, Wageningen, The Netherlands
| | - Cheong Xin Chan
- The University of Queensland, School of Chemistry and Molecular Biosciences, Australian Centre for Ecogenomics, Brisbane, QLD, 4072, Australia
| | - Peter D Erskine
- The University of Queensland, Sustainable Minerals Institute, Centre for Mined Land Rehabilitation, Brisbane, QLD, 4072, Australia
| | - Antony van der Ent
- The University of Queensland, Sustainable Minerals Institute, Centre for Mined Land Rehabilitation, Brisbane, QLD, 4072, Australia.
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O'Donohue B, Hiti-Bandaralage J, Gleeson M, O'Brien C, Harvey MA, van der Ent A, Pinto Irish K, Mitter N, Hayward A. Tissue culture tools for selenium hyperaccumulator Neptunia amplexicaulis for development in phytoextraction. NATURAL PRODUCTS AND BIOPROSPECTING 2022; 12:28. [PMID: 35927534 PMCID: PMC9352830 DOI: 10.1007/s13659-022-00351-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 06/08/2022] [Indexed: 06/15/2023]
Abstract
Neptunia amplexicaulis is an herbaceous legume endemic to the Richmond area in central Queensland, Australia and is one of the strongest known Selenium hyperaccumulators on earth, showing significant potential to be utilised in Se phytoextraction applications. Here a protocol was established for in vitro micropropagation of Se hyperaccumulator N. amplexicaulis using nodal segments from in vitro-germinated seedlings. Shoot multiplication was achieved on Murashige and Skoog (MS) basal media supplemented with various concentrations of 6-Benzylaminopurine (BA) (1.0, 2.0, 3.0 mg L-1) alone or in combination with low levels of Naphthaleneacetic acid (NAA) (0.1, 0.2, 0.3 mg L-1), with 2.0 mg L-1 BA + 0.2 mg L-1 NAA found to be most effective. Elongated shoots were rooted in vitro using NAA, with highest root induction rate of 30% observed at 0.2 mg L-1 NAA. About 95% of the in vitro rooted shoots survived acclimatization. Clonally propagated plantlets were dosed with selenate/selenite solution and assessed for Se tissue concentrations using Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) and found to retain their ability to hyperaccumulate. The protocol developed for this study has potential to be optimised for generating clonal plants of N. amplexicaulis for use in research and phytoextraction industry applications.
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Affiliation(s)
- Billy O'Donohue
- Centre for Horticultural Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, Australia.
| | - Jayeni Hiti-Bandaralage
- Centre for Horticultural Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, Australia
| | - Madeleine Gleeson
- Centre for Horticultural Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, Australia
| | - Chris O'Brien
- Centre for Horticultural Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, Australia
| | - Maggie-Anne Harvey
- Centre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, Brisbane, QLD, Australia
| | - Antony van der Ent
- Centre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, Brisbane, QLD, Australia
| | - Katherine Pinto Irish
- Centre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, Brisbane, QLD, Australia
| | - Neena Mitter
- Centre for Horticultural Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, Australia
| | - Alice Hayward
- Centre for Horticultural Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, Australia
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9
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van der Ent A, Casey LW, Blamey FPC, Kopittke PM. Time-resolved laboratory micro-X-ray fluorescence reveals silicon distribution in relation to manganese toxicity in soybean and sunflower. ANNALS OF BOTANY 2020; 126:331-341. [PMID: 32337539 PMCID: PMC7380460 DOI: 10.1093/aob/mcaa081] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Accepted: 04/21/2020] [Indexed: 05/14/2023]
Abstract
BACKGROUND AND AIMS Synchrotron- and laboratory-based micro-X-ray fluorescence (µ-XRF) is a powerful technique to quantify the distribution of elements in physically large intact samples, including live plants, at room temperature and atmospheric pressure. However, analysis of light elements with atomic number (Z) less than that of phosphorus is challenging due to the need for a vacuum, which of course is not compatible with live plant material, or the availability of a helium environment. METHOD A new laboratory µ-XRF instrument was used to examine the effects of silicon (Si) on the manganese (Mn) status of soybean (Glycine max) and sunflower (Helianthus annuus) grown at elevated Mn in solution. The use of a helium environment allowed for highly sensitive detection of both Si and Mn to determine their distribution. KEY RESULTS The µ-XRF analysis revealed that when Si was added to the nutrient solution, the Si also accumulated in the base of the trichomes, being co-located with the Mn and reducing the darkening of the trichomes. The addition of Si did not reduce the concentrations of Mn in accumulations despite seeming to reduce its adverse effects. CONCLUSIONS The ability to gain information on the dynamics of the metallome or ionome within living plants or excised hydrated tissues can offer valuable insights into their ecophysiology, and laboratory µ-XRF is likely to become available to more plant scientists for use in their research.
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Affiliation(s)
- Antony van der Ent
- Sustainable Minerals Institute, The University of Queensland, Brisbane, Australia
| | - Lachlan W Casey
- Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, Australia
| | - F Pax C Blamey
- School of Agriculture and Food Sciences, The University of Queensland, Brisbane, Australia
| | - Peter M Kopittke
- School of Agriculture and Food Sciences, The University of Queensland, Brisbane, Australia
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