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Redox Interactions of Vitamin C and Iron: Inhibition of the Pro-Oxidant Activity by Deferiprone. Int J Mol Sci 2020; 21:ijms21113967. [PMID: 32486511 PMCID: PMC7312906 DOI: 10.3390/ijms21113967] [Citation(s) in RCA: 70] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 05/12/2020] [Accepted: 05/28/2020] [Indexed: 02/07/2023] Open
Abstract
Ascorbic acid (AscH2) is one of the most important vitamins found in the human diet, with many biological functions including antioxidant, chelating, and coenzyme activities. Ascorbic acid is also widely used in medical practice especially for increasing iron absorption and as an adjuvant therapeutic in iron chelation therapy, but its mode of action and implications in iron metabolism and toxicity are not yet clear. In this study, we used UV–Vis spectrophotometry, NMR spectroscopy, and EPR spin trapping spectroscopy to investigate the antioxidant/pro-oxidant effects of ascorbic acid in reactions involving iron and the iron chelator deferiprone (L1). The experiments were carried out in a weak acidic (pH from 3 to 5) and neutral (pH 7.4) medium. Ascorbic acid exhibits predominantly pro-oxidant activity by reducing Fe3+ to Fe2+, followed by the formation of dehydroascorbic acid. As a result, ascorbic acid accelerates the redox cycle Fe3+ ↔ Fe2+ in the Fenton reaction, which leads to a significant increase in the yield of toxic hydroxyl radicals. The analysis of the experimental data suggests that despite a much lower stability constant of the iron–ascorbate complex compared to the FeL13 complex, ascorbic acid at high concentrations is able to substitute L1 in the FeL13 chelate complex resulting in the formation of mixed L12AscFe complex. This mixed chelate complex is redox stable at neutral pH = 7.4, but decomposes at pH = 4–5 during several minutes at sub-millimolar concentrations of ascorbic acid. The proposed mechanisms play a significant role in understanding the mechanism of action, pharmacological, therapeutic, and toxic effects of the interaction of ascorbic acid, iron, and L1.
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Sharma R, Yeh K. The dual benefit of a dominant mutation in Arabidopsis IRON DEFICIENCY TOLERANT1 for iron biofortification and heavy metal phytoremediation. PLANT BIOTECHNOLOGY JOURNAL 2020; 18:1200-1210. [PMID: 31671241 PMCID: PMC7152604 DOI: 10.1111/pbi.13285] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 10/17/2019] [Accepted: 10/22/2019] [Indexed: 05/12/2023]
Abstract
One of the goals of biofortification is to generate iron-enriched crops to combat growth and developmental defects especially iron (Fe) deficiency anaemia. Fe-fortification of food is challenging because soluble Fe is unstable and insoluble Fe is nonbioavailable. Genetic engineering is an alternative approach for Fe-biofortification, but so far strategies to increase Fe content have only encompassed a few genes with limited success. In this study, we demonstrate that the ethyl methanesulfonate (EMS) mutant, iron deficiency tolerant1 (idt1), can accumulate 4-7 times higher amounts of Fe than the wild type in roots, shoots and seeds, and exhibits the metal tolerance and iron accumulation (Metina) phenotype in Arabidopsis. Fe-regulated protein stability and nuclear localisation of the upstream transcriptional regulator bHLH34 were uncovered. The C to T transition mutation resulting in substitution of alanine to valine at amino acid position 320 of bHLH34 (designated as IDT1A320V ) in a conserved motif among mono- and dicots was found to be responsible for a dominant phenotype that possesses constitutive activation of the Fe regulatory pathway. Overexpression of IDT1A320V in Arabidopsis and tobacco led to the Metina phenotype; a phenotype that has escalated specificity towards optimising Fe homeostasis and may be useful in Fe-biofortification. Knowledge of the high tolerance and accumulation of heavy metals of this mutant can aid the development of tools for phytoremediation of contaminants.
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Affiliation(s)
- Reena Sharma
- Agricultural Biotechnology Research CenterAcademia SinicaTaipeiTaiwan
- Molecular and Biological Agricultural Sciences ProgramTaiwan International Graduate ProgramAcademia Sinica and National Chung Hsing UniversityTaipeiTaiwan
- Graduate Institute of BiotechnologyNational Chung Hsing UniversityTaichungTaiwan
| | - Kuo‐Chen Yeh
- Agricultural Biotechnology Research CenterAcademia SinicaTaipeiTaiwan
- Molecular and Biological Agricultural Sciences ProgramTaiwan International Graduate ProgramAcademia Sinica and National Chung Hsing UniversityTaipeiTaiwan
- Biotechnology CenterNational Chung Hsing UniversityTaichungTaiwan
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Terai Y, Ueno H, Ogawa T, Sawa Y, Miyagi A, Kawai-Yamada M, Ishikawa T, Maruta T. Dehydroascorbate Reductases and Glutathione Set a Threshold for High-Light-Induced Ascorbate Accumulation. PLANT PHYSIOLOGY 2020; 183:112-122. [PMID: 32205453 PMCID: PMC7210653 DOI: 10.1104/pp.19.01556] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Accepted: 03/09/2020] [Indexed: 05/20/2023]
Abstract
Plants require a high concentration of ascorbate as a redox buffer for survival under stress conditions, such as high light. Dehydroascorbate reductases (DHARs) are enzymes that catalyze the reduction of DHA to ascorbate using reduced glutathione (GSH) as an electron donor, allowing rapid ascorbate recycling. However, a recent study using an Arabidopsis (Arabidopsis thaliana) triple mutant lacking all three DHAR genes (herein called ∆dhar) did not find evidence for their role in ascorbate recycling under oxidative stress. To further study the function of DHARs, we generated ∆dhar Arabidopsis plants as well as a quadruple mutant line combining ∆dhar with an additional vtc2 mutation that causes ascorbate deficiency. Measurements of ascorbate in these mutants under low- or high-light conditions indicated that DHARs have a nonnegligible impact on full ascorbate accumulation under high light, but that they are dispensable when ascorbate concentrations are low to moderate. Because GSH itself can reduce DHA nonenzymatically, we used the pad2 mutant that contains ∼30% of the wild-type GSH level. The pad2 mutant accumulated ascorbate at a wild-type level under high light; however, when the pad2 mutation was combined with ∆dhar, there was near-complete inhibition of high-light-dependent ascorbate accumulation. The lack of ascorbate accumulation was consistent with a marked increase in the ascorbate degradation product threonate. These findings indicate that ascorbate recycling capacity is limited in ∆dhar pad2 plants, and that both DHAR activity and GSH content set a threshold for high-light-induced ascorbate accumulation.
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Affiliation(s)
- Yusuke Terai
- Department of Life Science and Biotechnology, Faculty of Life and Environmental Science, Shimane University, Shimane 690-8504, Japan
| | - Hiromi Ueno
- Graduate School of Natural Science and Technology, Shimane University, Shimane 690-8504, Japan
| | - Takahisa Ogawa
- Department of Life Science and Biotechnology, Faculty of Life and Environmental Science, Shimane University, Shimane 690-8504, Japan
- Graduate School of Natural Science and Technology, Shimane University, Shimane 690-8504, Japan
- Institute of Agricultural and Life Sciences, Academic Assembly, Shimane University, Shimane 690-8504, Japan
| | - Yoshihiro Sawa
- Department of Life Science and Biotechnology, Faculty of Life and Environmental Science, Shimane University, Shimane 690-8504, Japan
| | - Atsuko Miyagi
- Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan
| | - Maki Kawai-Yamada
- Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan
| | - Takahiro Ishikawa
- Department of Life Science and Biotechnology, Faculty of Life and Environmental Science, Shimane University, Shimane 690-8504, Japan
- Graduate School of Natural Science and Technology, Shimane University, Shimane 690-8504, Japan
- Institute of Agricultural and Life Sciences, Academic Assembly, Shimane University, Shimane 690-8504, Japan
| | - Takanori Maruta
- Department of Life Science and Biotechnology, Faculty of Life and Environmental Science, Shimane University, Shimane 690-8504, Japan
- Graduate School of Natural Science and Technology, Shimane University, Shimane 690-8504, Japan
- Institute of Agricultural and Life Sciences, Academic Assembly, Shimane University, Shimane 690-8504, Japan
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Foyer CH, Kyndt T, Hancock RD. Vitamin C in Plants: Novel Concepts, New Perspectives, and Outstanding Issues. Antioxid Redox Signal 2020; 32:463-485. [PMID: 31701753 DOI: 10.1089/ars.2019.7819] [Citation(s) in RCA: 66] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Significance: The concept that vitamin C (l-ascorbic acid) is at the heart of the peroxide processing and redox signaling hub in plants is well established, but our knowledge of the precise mechanisms involved remains patchy at best. Recent Advances: Ascorbate participates in the multifaceted signaling pathways initiated by both reactive oxygen species (ROS) and reactive nitrogen species. Crucially, the apoplastic ascorbate/dehydroascorbate (DHA) ratio that is regulated by ascorbate oxidase (AO) sculpts the apoplastic ROS (apoROS) signal that controls polarized cell growth, biotic and abiotic defences, and cell to cell signaling, as well as exerting control over the light-dependent regulation of photosynthesis. Critical Issues: Here we re-evaluate the roles of ascorbate in photosynthesis and other processes, addressing the question of how much we really know about the regulation of ascorbate homeostasis and its functions in plants, or how AO is regulated to modulate apoROS signals. Future Directions: The role of microRNAs in the regulation of AO activity in relation to stress perception and signaling must be resolved. Similarly, the molecular characterization of ascorbate transporters and mechanistic links between photosynthetic and respiratory electron transport and ascorbate synthesis/homeostasis are a prerequisite to understanding ascorbate homeostasis and function. Similarly, there is little in vivo evidence for ascorbate functions as an enzyme cofactor.
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Affiliation(s)
- Christine H Foyer
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Edgbaston, United Kingdom
| | - Tina Kyndt
- Department Biotechnology, University of Ghent, Ghent, Belgium
| | - Robert D Hancock
- Cell and Molecular Sciences, The James Hutton Institute, Dundee, United Kingdom
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55
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Handing off iron to the next generation: how does it get into seeds and what for? Biochem J 2020; 477:259-274. [DOI: 10.1042/bcj20190188] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 12/18/2019] [Accepted: 12/23/2019] [Indexed: 01/24/2023]
Abstract
To ensure the success of the new generation in annual species, the mother plant transfers a large proportion of the nutrients it has accumulated during its vegetative life to the next generation through its seeds. Iron (Fe) is required in large amounts to provide the energy and redox power to sustain seedling growth. However, free Fe is highly toxic as it leads to the generation of reactive oxygen species. Fe must, therefore, be tightly bound to chelating molecules to allow seed survival for long periods of time without oxidative damage. Nevertheless, when conditions are favorable, the seed's Fe stores have to be readily remobilized to achieve the transition toward active photosynthesis before the seedling becomes able to take up Fe from the environment. This is likely critical for the vigor of the young plant. Seeds constitute an important dietary source of Fe, which is essential for human health. Understanding the mechanisms of Fe storage in seeds is a key to improve their Fe content and availability in order to fight Fe deficiency. Seed longevity, germination efficiency and seedling vigor are also important traits that may be affected by the chemical form under which Fe is stored. In this review, we summarize the current knowledge on seed Fe loading during development, long-term storage and remobilization upon germination. We highlight how this knowledge may help seed Fe biofortification and discuss how Fe storage may affect the seed quality and germination efficiency.
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Pongrac P, Arčon I, Castillo-Michel H, Vogel-Mikuš K. Mineral Element Composition in Grain of Awned and Awnletted Wheat ( Triticum aestivum L.) Cultivars: Tissue-Specific Iron Speciation and Phytate and Non-Phytate Ligand Ratio. PLANTS 2020; 9:plants9010079. [PMID: 31936205 PMCID: PMC7020463 DOI: 10.3390/plants9010079] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 01/04/2020] [Accepted: 01/06/2020] [Indexed: 11/16/2022]
Abstract
In wheat (Triticum aestivum L.), the awns—the bristle-like structures extending from lemmas—are photosynthetically active. Compared to awned cultivars, awnletted cultivars produce more grains per unit area and per spike, resulting in significant reduction in grain size, but their mineral element composition remains unstudied. Nine awned and 11 awnletted cultivars were grown simultaneously in the field. With no difference in 1000-grain weight, a larger calcium and manganese—but smaller iron (Fe) concentrations—were found in whole grain of awned than in awnletted cultivars. Micro X-ray absorption near edge structure analysis of different tissues of frozen-hydrated grain cross-sections revealed that differences in total Fe concentration were not accompanied by differences in Fe speciation (64% of Fe existed as ferric and 36% as ferrous species) or Fe ligands (53% were phytate and 47% were non-phytate ligands). In contrast, there was a distinct tissue-specificity with pericarp containing the largest proportion (86%) of ferric species and nucellar projection (49%) the smallest. Phytate ligand was predominant in aleurone, scutellum and embryo (72%, 70%, and 56%, respectively), while nucellar projection and pericarp contained only non-phytate ligands. Assuming Fe bioavailability depends on Fe ligands, we conclude that Fe bioavailability from wheat grain is tissue specific.
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Affiliation(s)
- Paula Pongrac
- Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia; (I.A.); (K.V.-M.)
- Correspondence: ; Tel.: +386-51-222-963; Fax: +386-477-31-51
| | - Iztok Arčon
- Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia; (I.A.); (K.V.-M.)
- Laboratory for quantum optics, University of Nova Gorica, Vipavska 13, SI-5000 Nova Gorica, Slovenia
| | | | - Katarina Vogel-Mikuš
- Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia; (I.A.); (K.V.-M.)
- Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia
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57
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Broad RC, Bonneau JP, Beasley JT, Roden S, Sadowski P, Jewell N, Brien C, Berger B, Tako E, Glahn RP, Hellens RP, Johnson AAT. Effect of Rice GDP-L-Galactose Phosphorylase Constitutive Overexpression on Ascorbate Concentration, Stress Tolerance, and Iron Bioavailability in Rice. FRONTIERS IN PLANT SCIENCE 2020; 11:595439. [PMID: 33343598 PMCID: PMC7744345 DOI: 10.3389/fpls.2020.595439] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Accepted: 11/16/2020] [Indexed: 05/12/2023]
Abstract
Ascorbate (vitamin C) is an essential multifunctional molecule for both plants and mammals. In plants, ascorbate is the most abundant water-soluble antioxidant that supports stress tolerance. In humans, ascorbate is an essential micronutrient and promotes iron (Fe) absorption in the gut. Engineering crops with increased ascorbate levels have the potential to improve both crop stress tolerance and human health. Here, rice (Oryza sativa L.) plants were engineered to constitutively overexpress the rice GDP-L-galactose phosphorylase coding sequence (35S-OsGGP), which encodes the rate-limiting enzymatic step of the L-galactose pathway. Ascorbate concentrations were negligible in both null segregant (NS) and 35S-OsGGP brown rice (BR, unpolished grain), but significantly increased in 35S-OsGGP germinated brown rice (GBR) relative to NS. Foliar ascorbate concentrations were significantly increased in 35S-OsGGP plants in the vegetative growth phase relative to NS, but significantly reduced at the reproductive growth phase and were associated with reduced OsGGP transcript levels. The 35S-OsGGP plants did not display altered salt tolerance at the vegetative growth phase despite having elevated ascorbate concentrations. Ascorbate concentrations were positively correlated with ferritin concentrations in Caco-2 cells - an accurate predictor of Fe bioavailability in human digestion - exposed to in vitro digests of NS and 35S-OsGGP BR and GBR samples.
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Affiliation(s)
- Ronan C. Broad
- School of Biosciences, The University of Melbourne, Melbourne, VIC, Australia
- *Correspondence: Ronan C. Broad,
| | - Julien P. Bonneau
- School of Biosciences, The University of Melbourne, Melbourne, VIC, Australia
| | - Jesse T. Beasley
- School of Biosciences, The University of Melbourne, Melbourne, VIC, Australia
| | - Sally Roden
- Centre for Agriculture and the Bioeconomy, Institute for Future Environments, Queensland University of Technology, Brisbane, QLD, Australia
| | - Pawel Sadowski
- Central Analytical Research Facility, Institute for Future Environments, Queensland University of Technology, Brisbane, QLD, Australia
| | - Nathaniel Jewell
- Australian Plant Phenomics Facility and School for Agriculture, Food and Wine, The University of Adelaide, Adelaide, SA, Australia
| | - Chris Brien
- Australian Plant Phenomics Facility and School for Agriculture, Food and Wine, The University of Adelaide, Adelaide, SA, Australia
| | - Bettina Berger
- Australian Plant Phenomics Facility and School for Agriculture, Food and Wine, The University of Adelaide, Adelaide, SA, Australia
| | - Elad Tako
- Department of Food Science, Cornell University, Ithaca, NY, United States
| | - Raymond P. Glahn
- Robert W. Holley Center for Agriculture and Health, USDA-ARS, Ithaca, NY, United States
| | - Roger P. Hellens
- Centre for Agriculture and the Bioeconomy, Institute for Future Environments, Queensland University of Technology, Brisbane, QLD, Australia
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58
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Perea-García A, Andrés-Bordería A, Vera-Sirera F, Pérez-Amador MA, Puig S, Peñarrubia L. Deregulated High Affinity Copper Transport Alters Iron Homeostasis in Arabidopsis. FRONTIERS IN PLANT SCIENCE 2020; 11:1106. [PMID: 32793263 PMCID: PMC7390907 DOI: 10.3389/fpls.2020.01106] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Accepted: 07/06/2020] [Indexed: 05/08/2023]
Abstract
The present work describes the effects on iron homeostasis when copper transport was deregulated in Arabidopsis thaliana by overexpressing high affinity copper transporters COPT1 and COPT3 (COPTOE ). A genome-wide analysis conducted on COPT1OE plants, highlighted that iron homeostasis gene expression was affected under both copper deficiency and excess. Among the altered genes were those encoding the iron uptake machinery and their transcriptional regulators. Subsequently, COPTOE seedlings contained less iron and were more sensitive than controls to iron deficiency. The deregulation of copper (I) uptake hindered the transcriptional activation of the subgroup Ib of basic helix-loop-helix (bHLH-Ib) factors under copper deficiency. Oppositely, copper excess inhibited the expression of the master regulator FIT but activated bHLH-Ib expression in COPTOE plants, in both cases leading to the lack of an adequate iron uptake response. As copper increased in the media, iron (III) was accumulated in roots, and the ratio iron (III)/iron (II) was increased in COPTOE plants. Thus, iron (III) overloading in COPTOE roots inhibited local iron deficiency responses, aimed to metal uptake from soil, leading to a general lower iron content in the COPTOE seedlings. These results emphasized the importance of appropriate spatiotemporal copper uptake for iron homeostasis under non-optimal copper supply. The understanding of the role of copper uptake in iron metabolism could be applied for increasing crops resistance to iron deficiency.
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Affiliation(s)
- Ana Perea-García
- Departamento de Biotecnología, Instituto de Agroquímica y Tecnología de Alimentos (IATA), Consejo Superior de Investigaciones Científicas (CSIC), Paterna, Valencia, Spain
| | - Amparo Andrés-Bordería
- Departament de Bioquímica i Biologia Molecular and Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina (ERI BIOTECMED), Universitat de València, Burjassot, Valencia, Spain
| | - Francisco Vera-Sirera
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), Consejo Superior de Investigaciones Científicas (CSIC)—Universidad Politécnica de Valencia (UPV), Valencia, Spain
| | - Miguel Angel Pérez-Amador
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), Consejo Superior de Investigaciones Científicas (CSIC)—Universidad Politécnica de Valencia (UPV), Valencia, Spain
| | - Sergi Puig
- Departamento de Biotecnología, Instituto de Agroquímica y Tecnología de Alimentos (IATA), Consejo Superior de Investigaciones Científicas (CSIC), Paterna, Valencia, Spain
| | - Lola Peñarrubia
- Departament de Bioquímica i Biologia Molecular and Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina (ERI BIOTECMED), Universitat de València, Burjassot, Valencia, Spain
- *Correspondence: Lola Peñarrubia,
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Kaur G, Shukla V, Kumar A, Kaur M, Goel P, Singh P, Shukla A, Meena V, Kaur J, Singh J, Mantri S, Rouached H, Pandey AK. Integrative analysis of hexaploid wheat roots identifies signature components during iron starvation. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:6141-6161. [PMID: 31738431 PMCID: PMC6859736 DOI: 10.1093/jxb/erz358] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Accepted: 07/24/2019] [Indexed: 05/05/2023]
Abstract
Iron (Fe) is an essential micronutrient for all organisms. In crop plants, Fe deficiency can decrease crop yield significantly; however, our current understanding of how major crops respond to Fe deficiency remains limited. Herein, the effect of Fe deprivation at both the transcriptomic and metabolic level in hexaploid wheat was investigated. Genome-wide gene expression reprogramming was observed in wheat roots subjected to Fe starvation, with a total of 5854 genes differentially expressed. Homoeologue and subgenome-specific analysis unveiled the induction-biased contribution from the A and B genomes. In general, the predominance of genes coding for nicotianamine synthase, yellow stripe-like transporters, metal transporters, ABC transporters, and zinc-induced facilitator-like protein was noted. Expression of genes related to the Strategy II mode of Fe uptake was also predominant. Our transcriptomic data were in agreement with the GC-MS analysis that showed the enhanced accumulation of various metabolites such as fumarate, malonate, succinate, and xylofuranose, which could be contributing to Fe mobilization. Interestingly, Fe starvation leads to a significant temporal increase of glutathione S-transferase at both the transcriptional level and enzymatic activity level, which indicates the involvement of glutathione in response to Fe stress in wheat roots. Taken together, our result provides new insight into the wheat response to Fe starvation at the molecular level and lays the foundation to design new strategies for the improvement of Fe nutrition in crops.
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Affiliation(s)
- Gazaldeep Kaur
- National Agri-Food Biotechnology Institute (Department of Biotechnology), Mohali, Punjab, India
- Department of Biotechnology, Panjab University, Chandigarh, India
| | - Vishnu Shukla
- National Agri-Food Biotechnology Institute (Department of Biotechnology), Mohali, Punjab, India
- University Institute of Engineering and Technology, Panjab University, Chandigarh, India
| | - Anil Kumar
- National Agri-Food Biotechnology Institute (Department of Biotechnology), Mohali, Punjab, India
- Department of Biotechnology, Panjab University, Chandigarh, India
| | - Mandeep Kaur
- National Agri-Food Biotechnology Institute (Department of Biotechnology), Mohali, Punjab, India
- Department of Biotechnology, Panjab University, Chandigarh, India
| | - Parul Goel
- National Agri-Food Biotechnology Institute (Department of Biotechnology), Mohali, Punjab, India
| | - Palvinder Singh
- National Agri-Food Biotechnology Institute (Department of Biotechnology), Mohali, Punjab, India
| | - Anuj Shukla
- National Agri-Food Biotechnology Institute (Department of Biotechnology), Mohali, Punjab, India
| | - Varsha Meena
- National Agri-Food Biotechnology Institute (Department of Biotechnology), Mohali, Punjab, India
| | - Jaspreet Kaur
- University Institute of Engineering and Technology, Panjab University, Chandigarh, India
| | - Jagtar Singh
- Department of Biotechnology, Panjab University, Chandigarh, India
| | - Shrikant Mantri
- National Agri-Food Biotechnology Institute (Department of Biotechnology), Mohali, Punjab, India
| | - Hatem Rouached
- BPMP, Université de Montpellier, INRA, CNRS, Montpellier SupAgro, Montpellier, France
| | - Ajay Kumar Pandey
- National Agri-Food Biotechnology Institute (Department of Biotechnology), Mohali, Punjab, India
- Correspondence: or
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Vitamin C in Plants: From Functions to Biofortification. Antioxidants (Basel) 2019; 8:antiox8110519. [PMID: 31671820 PMCID: PMC6912510 DOI: 10.3390/antiox8110519] [Citation(s) in RCA: 97] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 10/25/2019] [Accepted: 10/26/2019] [Indexed: 12/18/2022] Open
Abstract
Vitamin C (l-ascorbic acid) is an excellent free radical scavenger, not only for its capability to donate reducing equivalents but also for the relative stability of the derived monodehydroascorbate radical. However, vitamin C is not only an antioxidant, since it is also a cofactor for numerous enzymes involved in plant and human metabolism. In humans, vitamin C takes part in various physiological processes, such as iron absorption, collagen synthesis, immune stimulation, and epigenetic regulation. Due to the functional loss of the gene coding for l-gulonolactone oxidase, humans cannot synthesize vitamin C; thus, they principally utilize plant-based foods for their needs. For this reason, increasing the vitamin C content of crops could have helpful effects on human health. To achieve this objective, exhaustive knowledge of the metabolism and functions of vitamin C in plants is needed. In this review, the multiple roles of vitamin C in plant physiology as well as the regulation of its content, through biosynthetic or recycling pathways, are analyzed. Finally, attention is paid to the strategies that have been used to increase the content of vitamin C in crops, emphasizing not only the improvement of nutritional value of the crops but also the acquisition of plant stress resistance.
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61
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Clemens S. Metal ligands in micronutrient acquisition and homeostasis. PLANT, CELL & ENVIRONMENT 2019; 42:2902-2912. [PMID: 31350913 DOI: 10.1111/pce.13627] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 07/22/2019] [Accepted: 07/23/2019] [Indexed: 05/09/2023]
Abstract
Acquisition and homeostasis of micronutrients such as iron (Fe) and zinc (Zn) pose specific challenges. Poor solubility and high reactivity require controlled synthesis and supply of ligands to complex these metals extracellularly and intracellularly. Cytosolic labile pools represent only a minute fraction of the total cellular content. Several low-molecular-weight ligands are known in plants, including sulfur ligands (cysteine and peptides), nitrogen/oxygen ligands (S-adenosyl-l-methionine-derived molecules and histidine), and oxygen ligands (phenolics and organic acids). Some ligands are secreted into the extracellular space and influence the phytoavailability of metal ions. A second principal function is the intracellular buffering of micronutrients as well as the facilitation of long-distance transport in xylem and phloem. Furthermore, low-molecular-weight ligands are involved in the storage of metals, predominantly in vacuoles. A detailed molecular understanding is hampered by technical limitations, in particular the difficulty to detect and quantify cellular metal-ligand complexes. More, but still too little, is known about ligand synthesis and the transport across membranes, either with or without a complexed metal. Metal ligands have an immediate impact on human well-being. Engineering metal ligand synthesis and distribution in crops has tremendous potential to improve the nutritional quality of food and to tackle major human health risks.
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Affiliation(s)
- Stephan Clemens
- Department of Plant Physiology and Bayreuth Center of Ecology and Environmental Research, University of Bayreuth, Universitätsstrasse 30, 95447, Bayreuth, Germany
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62
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Wang P, McKenna BA, Menzies NW, Li C, Glover CJ, Zhao FJ, Kopittke PM. Minimizing experimental artefacts in synchrotron-based X-ray analyses of Fe speciation in tissues of rice plants. JOURNAL OF SYNCHROTRON RADIATION 2019; 26:1272-1279. [PMID: 31274454 DOI: 10.1107/s1600577519004351] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Accepted: 03/30/2019] [Indexed: 06/09/2023]
Abstract
Iron (Fe) plays an important role within environmental systems. Synchrotron-based X-ray approaches, including X-ray absorption spectroscopy (XAS), provide powerful tools for in situ analyses of Fe speciation, but beam damage during analysis may alter Fe speciation during its measurement. XAS was used to examine whether experimental conditions affect the analysis of Fe speciation in plant tissues. Even when analyzed in a cryostat at 12 K, it was found that FeIII can rapidly (within 0.5-1 min) photoreduce to FeII, although the magnitude of photoreduction varied depending upon the hydration of the sample, the coordination chemistry of the Fe, as well as other properties. For example, photoreduction of FeIII was considerably higher for aqueous standard compounds than for hydrated plant-root tissues. The use of freeze-dried samples in the cryostat (12 K) markedly reduced the magnitude of this FeIII photoreduction, and there was no evidence that the freeze-drying process itself resulted in experimental artefacts under the current experimental conditions, such as through the oxidation of FeII, although some comparatively small differences were observed when comparing spectra of hydrated and freeze-dried FeII compounds. The results of this study have demonstrated that FeIII photoreduction can occur during X-ray analysis, and provides suitable conditions to preserve Fe speciation to minimize the extent of beam damage when analyzing environmental samples. All studies utilizing XAS are encouraged to include a preliminary experiment to determine if beam damage is occurring, and, where appropriate, to take the necessary steps (such as freeze drying) to overcome these issues.
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Affiliation(s)
- Peng Wang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Brigid A McKenna
- School of Agriculture and Food Sciences, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Neal W Menzies
- School of Agriculture and Food Sciences, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Cui Li
- School of Agriculture and Food Sciences, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Chris J Glover
- Australian Synchrotron ANSTO, Clayton, Victoria 3168, Australia
| | - Fang Jie Zhao
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Peter M Kopittke
- School of Agriculture and Food Sciences, The University of Queensland, St Lucia, Queensland 4072, Australia
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Yin C, Wang F, Fan H, Fang Y, Li W. Identification of Tea Plant Purple Acid Phosphatase Genes and Their Expression Responses to Excess Iron. Int J Mol Sci 2019; 20:ijms20081954. [PMID: 31010077 PMCID: PMC6515233 DOI: 10.3390/ijms20081954] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 04/19/2019] [Accepted: 04/19/2019] [Indexed: 12/19/2022] Open
Abstract
Purple acid phosphatase (PAP) encoding genes are a multigene family. PAPs require iron (Fe) to exert their functions that are involved in diverse biological roles including Fe homeostasis. However, the possible roles of PAPs in response to excess Fe remain unknown. In this study, we attempted to understand the regulation of PAPs by excess Fe in tea plant (Camellia sinensis). A genome-wide investigation of PAP encoding genes identified 19 CsPAP members based on the conserved motifs. The phylogenetic analysis showed that PAPs could be clustered into four groups, of which group II contained two specific cysteine-containing motifs “GGECGV” and “YERTC”. To explore the expression patterns of CsPAP genes in response to excessive Fe supply, RNA-sequencing (RNA-seq) analyses were performed to compare their transcript abundances between tea plants that are grown under normal and high iron conditions, respectively. 17 members were shown to be transcribed in both roots and leaves. When supplied with a high amount of iron, the expression levels of four genes were significantly changed. Of which, CsPAP15a, CsPAP23 and CsPAP27c were shown as downregulated, while the highly expressed CsPAP10a was upregulated. Moreover, CsPAP23 was found to be alternatively spliced, suggesting its post-transcriptional regulation. The present work implicates that some CsPAP genes could be associated with the responses of tea plants to the iron regime, which may offer a new direction towards a further understanding of iron homeostasis and provide the potential approaches for crop improvement in terms of iron biofortification.
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Affiliation(s)
- Chaoyan Yin
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China.
| | - Fei Wang
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China.
| | - Huiqin Fan
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China.
| | - Yanming Fang
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China.
| | - Wenfeng Li
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China.
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Martinière A, Fiche JB, Smokvarska M, Mari S, Alcon C, Dumont X, Hematy K, Jaillais Y, Nollmann M, Maurel C. Osmotic Stress Activates Two Reactive Oxygen Species Pathways with Distinct Effects on Protein Nanodomains and Diffusion. PLANT PHYSIOLOGY 2019; 179:1581-1593. [PMID: 30718348 PMCID: PMC6446752 DOI: 10.1104/pp.18.01065] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Accepted: 01/24/2019] [Indexed: 05/19/2023]
Abstract
Physiological acclimation of plants to an everchanging environment is governed by complex combinatorial signaling networks that perceive and transduce various abiotic and biotic stimuli. Reactive oxygen species (ROS) serve as one of the second messengers in plant responses to hyperosmotic stress. The molecular bases of ROS production and the primary cellular processes that they target were investigated in the Arabidopsis (Arabidopsis thaliana) root. Combined pharmacological and genetic approaches showed that the RESPIRATORY BURST OXIDASE HOMOLOG (RBOH) pathway and an additional pathway involving apoplastic ascorbate and iron can account for ROS production upon hyperosmotic stimulation. The two pathways determine synergistically the rate of membrane internalization, within minutes after activation. Live superresolution microscopy revealed at single-molecule scale how ROS control specific diffusion and nano-organization of membrane cargo proteins. In particular, ROS generated by RBOHs initiated clustering of the PLASMA MEMBRANE INTRINSIC PROTEIN2;1 aquaporin and its removal from the plasma membrane. This process is contributed to by clathrin-mediated endocytosis, with a positive role of RBOH-dependent ROS, specifically under hyperosmotic stress.
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Affiliation(s)
- Alexandre Martinière
- BPMP, Univ Montpellier, CNRS, INRA, Montpellier SupAgro, 34090 Montpellier, France
| | - Jean Bernard Fiche
- Centre de Biochimie Structurale, Centre National de la Recherche Scientifique Unité Mixte de Recherche 5048, Institut National de la Santé et de la Recherche Médicale U1054, Université de Montpellier, 34090 Montpellier, France
| | - Marija Smokvarska
- BPMP, Univ Montpellier, CNRS, INRA, Montpellier SupAgro, 34090 Montpellier, France
| | - Stéphane Mari
- BPMP, Univ Montpellier, CNRS, INRA, Montpellier SupAgro, 34090 Montpellier, France
| | - Carine Alcon
- BPMP, Univ Montpellier, CNRS, INRA, Montpellier SupAgro, 34090 Montpellier, France
| | - Xavier Dumont
- BPMP, Univ Montpellier, CNRS, INRA, Montpellier SupAgro, 34090 Montpellier, France
| | - Kian Hematy
- Institut Jean-Pierre Bourgin, Institut National de la Recherche Agronomique, AgroParisTech, Centre National de la Recherche Scientifique, Université Paris-Saclay, 78026 Versailles, France
| | - Yvon Jaillais
- Laboratoire Reproduction et Développement des Plantes, Université Lyon, École Normale Supérieure de Lyon, Université Claude Bernard Lyon 1, Centre National de la Recherche Scientifique, Institut National de la Recherche Agronomique, F-69342 Lyon, France
| | - Marcelo Nollmann
- Centre de Biochimie Structurale, Centre National de la Recherche Scientifique Unité Mixte de Recherche 5048, Institut National de la Santé et de la Recherche Médicale U1054, Université de Montpellier, 34090 Montpellier, France
| | - Christophe Maurel
- BPMP, Univ Montpellier, CNRS, INRA, Montpellier SupAgro, 34090 Montpellier, France
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Wu LB, Holtkamp F, Wairich A, Frei M. Potassium Ion Channel Gene OsAKT1 Affects Iron Translocation in Rice Plants Exposed to Iron Toxicity. FRONTIERS IN PLANT SCIENCE 2019; 10:579. [PMID: 31134118 PMCID: PMC6517512 DOI: 10.3389/fpls.2019.00579] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Accepted: 04/18/2019] [Indexed: 05/17/2023]
Abstract
Iron toxicity is one of the most widely spread mineral disorders in anaerobic soils, but the tolerance mechanisms in plants are poorly understood. Here we characterize the involvement of a rice potassium ion channel gene, OsAKT1, in Fe toxic conditions. Two knock-down lines of OsAKT1 together with azygos lines were investigated. Mutant lines did not differ from azygos lines regarding plant growth, gas exchange rate or chlorophyll fluorescence in control conditions. However, loss-of-function of OsAKT1 increased the sensitivity to excess Fe regarding leaf bronzing symptoms, reactive oxygen species generation, leaf spectral reflectance indices, and chlorophyll fluorescence. Fe toxicity leads to largely reduced uptake of other nutrients into shoots, which illustrates the complexity of Fe stress related to multiple mineral disorders. Less potassium uptake in the mutants compared to azygos lines co-occurred with higher amounts of Fe accumulated in the shoot tissues but not in the roots. These results were consistent with a higher level of Fe loaded into the xylem sap of mutants compared to azygos lines in the early phase of Fe toxicity. In conclusion, OsAKT1 is crucial for the tolerance of rice against Fe toxicity as K homeostasis affects Fe translocation from root to shoot.
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Affiliation(s)
- Lin-Bo Wu
- Department of Plant Nutrition, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
| | - Felix Holtkamp
- Department of Plant Nutrition, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
| | - Andriele Wairich
- Department of Plant Nutrition, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
- Center for Biotechnology, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Michael Frei
- Department of Plant Nutrition, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
- *Correspondence: Michael Frei,
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66
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Sherman HG, Jovanovic C, Stolnik S, Baronian K, Downard AJ, Rawson FJ. New Perspectives on Iron Uptake in Eukaryotes. Front Mol Biosci 2018; 5:97. [PMID: 30510932 PMCID: PMC6254016 DOI: 10.3389/fmolb.2018.00097] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 10/23/2018] [Indexed: 12/20/2022] Open
Abstract
All eukaryotic organisms require iron to function. Malfunctions within iron homeostasis have a range of physiological consequences, and can lead to the development of pathological conditions that can result in an excess of non-transferrin bound iron (NTBI). Despite extensive understanding of iron homeostasis, the links between the “macroscopic” transport of iron across biological barriers (cellular membranes) and the chemistry of redox changes that drive these processes still needs elucidating. This review draws conclusions from the current literature, and describes some of the underlying biophysical and biochemical processes that occur in iron homeostasis. By first taking a broad view of iron uptake within the gut and subsequent delivery to tissues, in addition to describing the transferrin and non-transferrin mediated components of these processes, we provide a base of knowledge from which we further explore NTBI uptake. We provide concise up-to-date information of the transplasma electron transport systems (tPMETSs) involved within NTBI uptake, and highlight how these systems are not only involved within NTBI uptake for detoxification but also may play a role within the reduction of metabolic stress through regeneration of intracellular NAD(P)H/NAD(P)+ levels. Furthermore, we illuminate the thermodynamics that governs iron transport, namely the redox potential cascade and electrochemical behavior of key components of the electron transport systems that facilitate the movement of electrons across the plasma membrane to the extracellular compartment. We also take account of kinetic changes that occur to transport iron into the cell, namely membrane dipole change and their consequent effects within membrane structure that act to facilitate transport of ions.
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Affiliation(s)
- Harry G Sherman
- Division of Regenerative Medicine and Cellular Therapies, School of Pharmacy, University of Nottingham, Nottingham, United Kingdom
| | | | - Snow Stolnik
- Division of Molecular Therapeutics and Formulation, School of Pharmacy, University of Nottingham, Nottingham, United Kingdom
| | - Kim Baronian
- School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
| | - Alison J Downard
- MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Physical and Chemical Sciences, University of Canterbury, Christchurch, New Zealand
| | - Frankie J Rawson
- Division of Regenerative Medicine and Cellular Therapies, School of Pharmacy, University of Nottingham, Nottingham, United Kingdom
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Grillet L, Lan P, Li W, Mokkapati G, Schmidt W. IRON MAN is a ubiquitous family of peptides that control iron transport in plants. NATURE PLANTS 2018; 4:953-963. [PMID: 30323182 DOI: 10.1038/s41477-018-0266-y] [Citation(s) in RCA: 137] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Accepted: 08/28/2018] [Indexed: 05/09/2023]
Abstract
Iron (Fe) is an essential mineral nutrient that severely affects the growth, yield and nutritional quality of plants if not supplied in sufficient quantities. Here, we report that a short C-terminal amino-acid sequence consensus motif (IRON MAN; IMA) conserved across numerous, highly diverse peptides in angiosperms is essential for Fe uptake in plants. Overexpression of the IMA sequence in Arabidopsis induced Fe uptake genes in roots, causing accumulation of Fe and manganese in all plant parts including seeds. Silencing of all eight IMA genes harboured in the Arabidopsis genome abolished Fe uptake and caused severe chlorosis; increasing the Fe supply or expressing IMA1 restored the wild-type phenotype. IMA1 is predominantly expressed in the phloem, preferentially in leaves, and reciprocal grafting showed that IMA1 peptides in shoots positively regulate Fe uptake in roots. IMA homologues are highly responsive to the Fe status and functional when heterologously expressed across species. IMA constitutes a novel family of peptides that are critical for the acquisition and cellular homeostasis of Fe across land plants.
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Affiliation(s)
- Louis Grillet
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan
| | - Ping Lan
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
| | - Wenfeng Li
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan
- Collaborative Innovation Center of Sustainable Forestry in Southern China of Jiangsu Province, Nanjing Forestry University, Nanjing, China
| | - Girish Mokkapati
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan
- Graduate Institute of Biotechnology, National Chung Hsing University, Taichung, Taiwan
- Molecular Biology and Agricultural Sciences Program, Taiwan International Graduate program, Academia Sinica and National ChungHsing University, Taipei, Taiwan
| | - Wolfgang Schmidt
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan.
- Graduate Institute of Biotechnology, National Chung Hsing University, Taichung, Taiwan.
- Genome and Systems Biology Degree Program, College of Life Science, National Taiwan University, Taipei, Taiwan.
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68
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Xiao W, Jones AM, Collins RN, Waite TD. Investigating the effect of ascorbate on the Fe(II)-catalyzed transformation of the poorly crystalline iron mineral ferrihydrite. Biochim Biophys Acta Gen Subj 2018; 1862:1760-1769. [DOI: 10.1016/j.bbagen.2018.05.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 05/07/2018] [Accepted: 05/07/2018] [Indexed: 01/04/2023]
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69
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Gutiérrez-Alanís D, Ojeda-Rivera JO, Yong-Villalobos L, Cárdenas-Torres L, Herrera-Estrella L. Adaptation to Phosphate Scarcity: Tips from Arabidopsis Roots. TRENDS IN PLANT SCIENCE 2018; 23:721-730. [PMID: 29764728 DOI: 10.1016/j.tplants.2018.04.006] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 04/13/2018] [Accepted: 04/20/2018] [Indexed: 05/21/2023]
Abstract
Phosphorus (P) availability is a limiting factor for plant growth and development. Root tip contact with low Pi media triggers diverse changes in the root architecture of Arabidopsis thaliana. The most conspicuous among these modifications is the inhibition of root growth, which is triggered by a shift from an indeterminate to a determinate root growth program. This phenomenon takes place in the root tip and involves a reduction in cell elongation, a decrease in cell proliferation, and the induction of premature cell differentiation, resulting in meristem exhaustion. Here, we review recent findings in the root response of A. thaliana to low Pi availability and discuss the cellular and genetic basis of the inhibition of root growth in Pi-deprived seedlings.
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Affiliation(s)
- Dolores Gutiérrez-Alanís
- Metabolic Engineering Group, Unidad de Genómica Avanzada, Laboratorio Nacional de Genómica para la Biodiversidad (LANGEBIO) del Centro de Investigación y Estudios Avanzados, Km. 9.6 Libramiento Norte Carr. Irapuato-León, 36821, Irapuato, Guanajuato, México; These authors contributed equally to this manuscript
| | - Jonathan Odilón Ojeda-Rivera
- Metabolic Engineering Group, Unidad de Genómica Avanzada, Laboratorio Nacional de Genómica para la Biodiversidad (LANGEBIO) del Centro de Investigación y Estudios Avanzados, Km. 9.6 Libramiento Norte Carr. Irapuato-León, 36821, Irapuato, Guanajuato, México; These authors contributed equally to this manuscript
| | - Lenin Yong-Villalobos
- Metabolic Engineering Group, Unidad de Genómica Avanzada, Laboratorio Nacional de Genómica para la Biodiversidad (LANGEBIO) del Centro de Investigación y Estudios Avanzados, Km. 9.6 Libramiento Norte Carr. Irapuato-León, 36821, Irapuato, Guanajuato, México
| | - Luis Cárdenas-Torres
- Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apartado Postal 510-3, Cuernavaca, 62250, Morelos, México
| | - Luis Herrera-Estrella
- Metabolic Engineering Group, Unidad de Genómica Avanzada, Laboratorio Nacional de Genómica para la Biodiversidad (LANGEBIO) del Centro de Investigación y Estudios Avanzados, Km. 9.6 Libramiento Norte Carr. Irapuato-León, 36821, Irapuato, Guanajuato, México.
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71
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Smirnoff N. Ascorbic acid metabolism and functions: A comparison of plants and mammals. Free Radic Biol Med 2018; 122:116-129. [PMID: 29567393 PMCID: PMC6191929 DOI: 10.1016/j.freeradbiomed.2018.03.033] [Citation(s) in RCA: 303] [Impact Index Per Article: 50.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 03/15/2018] [Accepted: 03/17/2018] [Indexed: 02/07/2023]
Abstract
Ascorbic acid is synthesised by eukaryotes, the known exceptions being primates and some other animal groups which have lost functional gulonolactone oxidase. Prokaryotes do not synthesise ascorbate and do not need an ascorbate supply, so the functions that are essential for mammals and plants are not required or are substituted by other compounds. The ability of ascorbate to donate electrons enables it to act as a free radical scavenger and to reduce higher oxidation states of iron to Fe2+. These reactions are the basis of its biological activity along with the relative stability of the resulting resonance stabilised monodehydroascorbate radical. The importance of these properties is emphasised by the evolution of at least three biosynthetic pathways and production of an ascorbate analogue, erythroascorbate, by fungi. The iron reducing activity of ascorbate maintains the reactive centre Fe2+ of 2-oxoglutarate-dependent dioxygenases (2-ODDs) thus preventing inactivation. These enzymes have diverse functions and, recently, the possibility that ascorbate status in mammals could influence 2-ODDs involved in histone and DNA demethylation thereby influencing stem cell differentiation and cancer has been uncovered. Ascorbate is involved in iron uptake and transport in plants and animals. While the above biochemical functions are shared between mammals and plants, ascorbate peroxidase (APX) is an enzyme family limited to plants and photosynthetic protists. It provides these organisms with increased capacity to remove H2O2 produced by photosynthetic electron transport and photorespiration. The Fe reducing activity of ascorbate enables hydroxyl radical production (pro-oxidant effect) and the reactivity of dehydroascorbate (DHA) and reaction of its degradation products with proteins (dehydroascorbylation and glycation) is potentially damaging. Ascorbate status influences gene expression in plants and mammals but at present there is little evidence that it acts as a specific signalling molecule. It most likely acts indirectly by influencing the redox state of thiols and 2-ODD activity. However, the possibility that dehydroascorbylation is a regulatory post-translational protein modification could be explored.
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Affiliation(s)
- Nicholas Smirnoff
- Biosciences, College of Life and Environmental Sciences, University of Exeter, Geoffrey Pope Building, Stocker Road, Exeter EX4 4QD, UK.
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72
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Pottosin I, Zepeda-Jazo I. Powering the plasma membrane Ca2+-ROS self-amplifying loop. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:3317-3320. [PMID: 29931349 PMCID: PMC6009657 DOI: 10.1093/jxb/ery179] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Affiliation(s)
- Igor Pottosin
- Biomedical Center, University of Colima, Colima, Mexico
- School of Land and Food, University of Tasmania, Hobart Tas., Australia
| | - Isaac Zepeda-Jazo
- Food Genomics Department, University of La Ciénega Michoacán de Ocampo State, Sahuayo Mich, Mexico
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73
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Makavitskaya M, Svistunenko D, Navaselsky I, Hryvusevich P, Mackievic V, Rabadanova C, Tyutereva E, Samokhina V, Straltsova D, Sokolik A, Voitsekhovskaja O, Demidchik V. Novel roles of ascorbate in plants: induction of cytosolic Ca2+ signals and efflux from cells via anion channels. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:3477-3489. [PMID: 29471538 DOI: 10.1093/jxb/ery056] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 02/13/2017] [Indexed: 05/22/2023]
Abstract
Ascorbate is not often considered as a signalling molecule in plants. This study demonstrates that, in Arabidopsis roots, exogenous l-ascorbic acid triggers a transient increase of the cytosolic free calcium activity ([Ca2+]cyt.) that is central to plant signalling. Exogenous copper and iron stimulate the ascorbate-induced [Ca2+]cyt. elevation, while cation channel blockers, free radical scavengers, low extracellular [Ca2+], transition metal chelators, and removal of the cell wall inhibit this reaction. These data show that apoplastic redox-active transition metals are involved in the ascorbate-induced [Ca2+]cyt. elevation. Exogenous ascorbate also induces a moderate increase in programmed cell death symptoms in intact roots, but it does not activate Ca2+ influx currents in patch-clamped root protoplasts. Intriguingly, the replacement of gluconate with ascorbate in the patch-clamp pipette reveals a large ascorbate efflux current, which shows sensitivity to the anion channel blocker, anthracene-9-carboxylic acid (A9C), indicative of the ascorbate release via anion channels. EPR spectroscopy measurements demonstrate that salinity (NaCl) triggers the accumulation of root apoplastic ascorbyl radicals in an A9C-dependent manner, confirming that l-ascorbate leaks through anion channels under depolarization. This mechanism may underlie ascorbate release, signalling phenomena, apoplastic redox reactions, iron acquisition, and control the ionic and electrical equilibrium (together with K+ efflux via GORK channels).
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Affiliation(s)
- M Makavitskaya
- Department of Plant Cell Biology and Bioengineering, Biological Faculty, Belarusian State University, Independence Square, Minsk, Belarusian
| | - D Svistunenko
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, Essex, UK
| | - I Navaselsky
- Department of Plant Cell Biology and Bioengineering, Biological Faculty, Belarusian State University, Independence Square, Minsk, Belarusian
| | - P Hryvusevich
- Department of Plant Cell Biology and Bioengineering, Biological Faculty, Belarusian State University, Independence Square, Minsk, Belarusian
| | - V Mackievic
- Department of Plant Cell Biology and Bioengineering, Biological Faculty, Belarusian State University, Independence Square, Minsk, Belarusian
| | - C Rabadanova
- Russian Academy of Sciences, Komarov Botanical Institute, St Petersburg, Russia
| | - E Tyutereva
- Russian Academy of Sciences, Komarov Botanical Institute, St Petersburg, Russia
| | - V Samokhina
- Department of Plant Cell Biology and Bioengineering, Biological Faculty, Belarusian State University, Independence Square, Minsk, Belarusian
| | - D Straltsova
- Department of Plant Cell Biology and Bioengineering, Biological Faculty, Belarusian State University, Independence Square, Minsk, Belarusian
| | - A Sokolik
- Department of Plant Cell Biology and Bioengineering, Biological Faculty, Belarusian State University, Independence Square, Minsk, Belarusian
| | - O Voitsekhovskaja
- Russian Academy of Sciences, Komarov Botanical Institute, St Petersburg, Russia
| | - V Demidchik
- Department of Plant Cell Biology and Bioengineering, Biological Faculty, Belarusian State University, Independence Square, Minsk, Belarusian
- Russian Academy of Sciences, Komarov Botanical Institute, St Petersburg, Russia
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74
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Guha T, Ravikumar KVG, Mukherjee A, Mukherjee A, Kundu R. Nanopriming with zero valent iron (nZVI) enhances germination and growth in aromatic rice cultivar (Oryza sativa cv. Gobindabhog L.). PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2018; 127:403-413. [PMID: 29679934 DOI: 10.1016/j.plaphy.2018.04.014] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 04/11/2018] [Accepted: 04/11/2018] [Indexed: 05/20/2023]
Abstract
Engineered nanoparticles are utilized in agriculture for various purposes. They can be used as fertilizer, carrier for macro/micro nutrients or priming agents. Various nanoparticles are reported to have toxicity at very high doses, but at optimum concentration, they can be beneficial for plant growth and development. In the present study, low concentrations of nZVI nanoparticles were evaluated for their growth enhancement potential as seed priming agent in an aromatic rice cultivar, Oryza sativa cv. Gobindabhog. Seeds were primed with different concentrations (10, 20, 40, 80, 160 mg L-1) of nZVI and allowed to grow for 14 days. Seed germination and seedling growth were studied by assessing physiological, biochemical, and structural parameters at different time points. Maximum activities of hydrolytic and antioxidant enzymes, along with root dehydrogenase enzyme were observed in 20 mg L-1 nZVI primed seeds. Priming with low doses of nZVI increased seedling vigour, as expressed by increased root and shoot length, biomass and photosynthetic pigment content. Our study also confirmed that after 14 days growth, the seedling showed absence of membrane damage, reduction in proline level and anti-oxidant enzyme activities. However, seedlings primed with 160 mg L-1 nZVI suffered oxidative stress. SEM micrographs also revealed damage in root tissue at that concentration. AAS study confirmed uptake of nZVI by the rice plants as maximum level of iron was found in the plants treated with highest concentration (i.e. 160 mg L-1 nZVI). Thus, nZVI at low concentrations can be considered as priming agent of rice seeds for increasing plant vigour.
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Affiliation(s)
- Titir Guha
- Department of Botany, Centre of Advanced Studies, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, 700 019, India
| | - K V G Ravikumar
- Centre for Nanobiotechnology, Vellore Institute of Technology, Vellore, Tamil Nadu, 632 014, India
| | - Amitava Mukherjee
- Centre for Nanobiotechnology, Vellore Institute of Technology, Vellore, Tamil Nadu, 632 014, India
| | - Anita Mukherjee
- Department of Botany, Centre of Advanced Studies, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, 700 019, India
| | - Rita Kundu
- Department of Botany, Centre of Advanced Studies, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, 700 019, India.
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75
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Moore KL, Rodríguez-Ramiro I, Jones ER, Jones EJ, Rodríguez-Celma J, Halsey K, Domoney C, Shewry PR, Fairweather-Tait S, Balk J. The stage of seed development influences iron bioavailability in pea (Pisum sativum L.). Sci Rep 2018; 8:6865. [PMID: 29720667 PMCID: PMC5932076 DOI: 10.1038/s41598-018-25130-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 04/13/2018] [Indexed: 01/14/2023] Open
Abstract
Pea seeds are widely consumed in their immature form, known as garden peas and petit pois, mostly after preservation by freezing or canning. Mature dry peas are rich in iron in the form of ferritin, but little is known about the content, form or bioavailability of iron in immature stages of seed development. Using specific antibodies and in-gel iron staining, we show that ferritin loaded with iron accumulated gradually during seed development. Immunolocalization and high-resolution secondary ion mass spectrometry (NanoSIMS) revealed that iron-loaded ferritin was located at the surface of starch-containing plastids. Standard cooking procedures destabilized monomeric ferritin and the iron-loaded form. Iron uptake studies using Caco-2 cells showed that the iron in microwaved immature peas was more bioavailable than in boiled mature peas, despite similar levels of soluble iron in the digestates. By manipulating the levels of phytic acid in the digestates we demonstrate that phytic acid is the main inhibitor of iron uptake from mature peas in vitro. Taken together, our data show that immature peas and mature dry peas contain similar levels of ferritin-iron, which is destabilized during cooking. However, iron from immature peas is more bioavailable because of lower phytic acid levels compared to mature peas.
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Affiliation(s)
- Katie L Moore
- School of Materials, University of Manchester, Manchester, M13 9PL, UK
| | | | - Eleanor R Jones
- Department of Biological Chemistry, John Innes Centre, Norwich, NR4 7UH, UK
| | - Emily J Jones
- Department of Biological Chemistry, John Innes Centre, Norwich, NR4 7UH, UK
| | - Jorge Rodríguez-Celma
- Department of Biological Chemistry, John Innes Centre, Norwich, NR4 7UH, UK
- School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ, UK
| | - Kirstie Halsey
- Department of Plant Sciences, Rothamsted Research, Harpenden, AL5 2JQ, UK
| | - Claire Domoney
- Department of Metabolic Biology, John Innes Centre, Norwich, NR4 7UH, UK
| | - Peter R Shewry
- Department of Plant Sciences, Rothamsted Research, Harpenden, AL5 2JQ, UK
| | | | - Janneke Balk
- Department of Biological Chemistry, John Innes Centre, Norwich, NR4 7UH, UK.
- School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ, UK.
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76
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Tsai HH, Rodríguez-Celma J, Lan P, Wu YC, Vélez-Bermúdez IC, Schmidt W. Scopoletin 8-Hydroxylase-Mediated Fraxetin Production Is Crucial for Iron Mobilization. PLANT PHYSIOLOGY 2018; 177:194-207. [PMID: 29559590 PMCID: PMC5933141 DOI: 10.1104/pp.18.00178] [Citation(s) in RCA: 80] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Accepted: 03/12/2018] [Indexed: 05/05/2023]
Abstract
Iron (Fe) is an essential mineral nutrient and an important factor for the composition of natural plant communities. Low Fe availability in aerated soils with neutral or alkaline pH has led to the evolution of elaborate mechanisms that extract Fe from the soil solution. In Arabidopsis (Arabidopsis thaliana), Fe is acquired by an orchestrated strategy that comprises mobilization, chelation, and reduction of Fe3+ prior to its uptake. Here, we show that At3g12900, previously annotated as scopoletin 8-hydroxylase (S8H), participates in Fe acquisition by mediating the biosynthesis of fraxetin (7,8-dihydroxy-6-methoxycoumarin), a coumarin derived from the scopoletin pathway. S8H is highly induced in roots of Fe-deficient plants both at the transcript and protein levels. Mutants defective in the expression of S8H showed increased sensitivity to growth on pH 7.0 media supplemented with an immobile source of Fe and reduced secretion of fraxetin. Transgenic lines overexpressing S8H exhibited an opposite phenotype. Homozygous s8h mutants grown on media with immobilized Fe accumulated significantly more scopolin, the storage form of scopoletin, supporting the designated function of S8H in scopoletin hydroxylation. Fraxetin exhibited Fe-reducing properties in vitro with higher rates being observed at neutral relative to acidic pH. Supplementing the media containing immobile Fe with fraxetin partially rescued the s8h mutants. In natural Arabidopsis accessions differing in their performance on media containing immobilized Fe, the amount of secreted fraxetin was highly correlated with growth and Fe and chlorophyll content, indicating that fraxetin secretion is a decisive factor for calcicole-calcifuge behavior (i.e. the ability/inability to thrive on alkaline soils) of plants.
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Affiliation(s)
- Huei-Hsuan Tsai
- Molecular and Biological Agricultural Sciences Program, Taiwan International Graduate Program, Academia Sinica and National Chung-Hsing University, Taipei 11529, Taiwan
- Graduate Institute of Biotechnology, National Chung-Hsing University, Taichung 40227, Taiwan
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei 11529, Taiwan
| | | | - Ping Lan
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, P.R. China
| | - Yu-Ching Wu
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei 11529, Taiwan
| | | | - Wolfgang Schmidt
- Molecular and Biological Agricultural Sciences Program, Taiwan International Graduate Program, Academia Sinica and National Chung-Hsing University, Taipei 11529, Taiwan
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei 11529, Taiwan
- Biotechnology Center, National Chung-Hsing University, Taichung 40227, Taiwan
- Genome and Systems Biology Degree Program, College of Life Science, National Taiwan University, Taipei 10617, Taiwan
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77
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Andresen E, Peiter E, Küpper H. Trace metal metabolism in plants. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:909-954. [PMID: 29447378 DOI: 10.1093/jxb/erx465] [Citation(s) in RCA: 170] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Accepted: 12/04/2017] [Indexed: 05/18/2023]
Abstract
Many trace metals are essential micronutrients, but also potent toxins. Due to natural and anthropogenic causes, vastly different trace metal concentrations occur in various habitats, ranging from deficient to toxic levels. Therefore, one focus of plant research is on the response to trace metals in terms of uptake, transport, sequestration, speciation, physiological use, deficiency, toxicity, and detoxification. In this review, we cover most of these aspects for the essential micronutrients copper, iron, manganese, molybdenum, nickel, and zinc to provide a broader overview than found in other recent reviews, to cross-link aspects of knowledge in this very active research field that are often seen in a separated way. For example, individual processes of metal usage, deficiency, or toxicity often were not mechanistically interconnected. Therefore, this review also aims to stimulate the communication of researchers following different approaches, such as gene expression analysis, biochemistry, or biophysics of metalloproteins. Furthermore, we highlight recent insights, emphasizing data obtained under physiologically and environmentally relevant conditions.
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Affiliation(s)
- Elisa Andresen
- Biology Centre, Czech Academy of Sciences, Institute of Plant Molecular Biology, Department of Plant Biophysics and Biochemistry, Branišovská, Ceské Budejovice, Czech Republic
| | - Edgar Peiter
- Martin Luther University Halle-Wittenberg, Institute of Agricultural and Nutritional Sciences, Plant Nutrition Laboratory, Betty-Heimann-Strasse, Halle (Saale), Germany
| | - Hendrik Küpper
- Biology Centre, Czech Academy of Sciences, Institute of Plant Molecular Biology, Department of Plant Biophysics and Biochemistry, Branišovská, České Budějovice, Czech Republic
- University of South Bohemia, Faculty of Science, Department of Experimental Plant Biology, Branišovská, České Budějovice, Czech Republic
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78
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Martinoia E. Vacuolar Transporters - Companions on a Longtime Journey. PLANT PHYSIOLOGY 2018; 176:1384-1407. [PMID: 29295940 PMCID: PMC5813537 DOI: 10.1104/pp.17.01481] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 11/15/2017] [Indexed: 05/15/2023]
Abstract
Biochemical and electrophysiological studies on plant vacuolar transporters became feasible in the late 1970s and early 1980s, when methods to isolate large quantities of intact vacuoles and purified vacuolar membrane vesicles were established. However, with the exception of the H+-ATPase and H+-PPase, which could be followed due to their hydrolytic activities, attempts to purify tonoplast transporters were for a long time not successful. Heterologous complementation, T-DNA insertion mutants, and later proteomic studies allowed the next steps, starting from the 1990s. Nowadays, our knowledge about vacuolar transporters has increased greatly. Nevertheless, there are several transporters of central importance that have still to be identified at the molecular level or have even not been characterized biochemically. Furthermore, our knowledge about regulation of the vacuolar transporters is very limited, and much work is needed to get a holistic view about the interplay of the vacuolar transportome. The huge amount of information generated during the last 35 years cannot be summarized in such a review. Therefore, I decided to concentrate on some aspects where we were involved during my research on vacuolar transporters, for some our laboratories contributed more, while others contributed less.
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Affiliation(s)
- Enrico Martinoia
- Department of Plant and Microbial Biology, University of Zurich, 8008 Zurich, Switzerland
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79
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Ibeas MA, Grant-Grant S, Coronas MF, Vargas-Pérez JI, Navarro N, Abreu I, Castillo-Michel H, Avalos-Cembrano N, Paez Valencia J, Perez F, González-Guerrero M, Roschzttardtz H. The Diverse Iron Distribution in Eudicotyledoneae Seeds: From Arabidopsis to Quinoa. FRONTIERS IN PLANT SCIENCE 2018; 9:1985. [PMID: 30697224 PMCID: PMC6341002 DOI: 10.3389/fpls.2018.01985] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Accepted: 12/20/2018] [Indexed: 05/08/2023]
Abstract
Seeds accumulate iron during embryo maturation stages of embryogenesis. Using Arabidopsis thaliana as model plant, it has been described that mature embryos accumulate iron within a specific cell layer, the endodermis. This distribution pattern was conserved in most of the analyzed members from Brassicales, with the exception of the basal Vasconcellea pubescens that also showed elevated amounts of iron in cortex cells. To determine whether the V. pubescens iron distribution was indicative of a wider pattern in non-Brassicales Eudicotyledoneae, we studied iron distribution pattern in different embryos belonging to plant species from different Orders from Eudicotyledoneae and one basal from Magnoliidae. The results obtained indicate that iron distribution in A. thaliana embryo is an extreme case of apomorphic character found in Brassicales, not-extensive to the rest of Eudicotyledoneae.
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Affiliation(s)
- Miguel Angel Ibeas
- Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Susana Grant-Grant
- Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Maria Fernanda Coronas
- Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | | | - Nathalia Navarro
- Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Isidro Abreu
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA), Universidad Politécnica de Madrid, Madrid, Spain
| | | | | | - Julio Paez Valencia
- Department of Botany, University of Wisconsin–Madison, Madison, WI, United States
| | - Fernanda Perez
- Departamento de Ecología, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Manuel González-Guerrero
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA), Universidad Politécnica de Madrid, Madrid, Spain
| | - Hannetz Roschzttardtz
- Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
- *Correspondence: Hannetz Roschzttardtz,
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80
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Grillet L, Schmidt W. The multiple facets of root iron reduction. JOURNAL OF EXPERIMENTAL BOTANY 2017; 68:5021-5027. [PMID: 29036459 DOI: 10.1093/jxb/erx320] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The biological significance of iron (Fe) is based on its propensity to oscillate between the ferric and ferrous forms, a transition that also affects its phyto-availability in soils. With the exception of grasses, Fe3+ is unavailable to plants. Most angiosperms employ a reduction-based Fe uptake mechanism, which relies on enzymatic reduction of ferric iron as an obligatory, rate-limiting step prior to uptake. This system functions optimally in acidic soils. Calcicole plants are, however, exposed to environments that are alkaline and/or have suboptimal availability of phosphorous, conditions under which the enzymatic reduction mechanism ceases to work effectively. We propose that auxiliary, non-enzymatic Fe reduction can be of critical importance for conferring fitness to plants thriving in alkaline soils with low bioavailability of Fe and/or phosphorus.
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Affiliation(s)
- Louis Grillet
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei 11529, Taiwan
| | - Wolfgang Schmidt
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei 11529, Taiwan
- Biotechnology Center, National Chung-Hsing University, Taichung 40227, Taiwan
- Genome and Systems Biology Degree Program, College of Life Science, National Taiwan University, Taipei 10617, Taiwan
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81
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Abel S. Phosphate scouting by root tips. CURRENT OPINION IN PLANT BIOLOGY 2017; 39:168-177. [PMID: 28527590 DOI: 10.1016/j.pbi.2017.04.016] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 04/12/2017] [Accepted: 04/22/2017] [Indexed: 05/21/2023]
Abstract
Chemistry assigns phosphate (Pi) dominant roles in metabolism; however, it also renders the macronutrient a genuinely limiting factor of plant productivity. Pi bioavailability is restricted by low Pi mobility in soil and antagonized by metallic toxicities, which force roots to actively seek and selectively acquire the vital element. During the past few years, a first conceptual outline has emerged of the sensory mechanisms at root tips, which monitor external Pi and transmit the edaphic cue to inform root development. This review highlights new aspects of the Pi acquisition strategy of Arabidopsis roots, as well as a framework of local Pi sensing in the context of antagonistic interactions between Pi and its major associated metallic cations, Fe3+ and Al3+.
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Affiliation(s)
- Steffen Abel
- Department of Molecular Signal Processing, Leibniz Institute of Plant Biochemistry, 06120 Halle, Germany; Department of Plant Sciences, University of California, Davis, CA 95616, USA.
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82
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Jeong J, Merkovich A, Clyne M, Connolly EL. Directing iron transport in dicots: regulation of iron acquisition and translocation. CURRENT OPINION IN PLANT BIOLOGY 2017; 39:106-113. [PMID: 28689052 DOI: 10.1016/j.pbi.2017.06.014] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 06/15/2017] [Accepted: 06/19/2017] [Indexed: 05/03/2023]
Abstract
Iron is essential for plant growth and development, but excess iron is cytotoxic. While iron is abundant in soil, it is often a limiting nutrient for plant growth. Consequentially, plants have evolved mechanisms to tightly regulate iron uptake, trafficking and storage. Recent work has contributed to a more comprehensive picture of iron uptake, further elucidating molecular and physiological processes that aid in solubilization of iron and modulation of the root system architecture in response to iron availability. Recent progress in understanding the regulators of the iron deficiency response and iron translocation from root to shoots, and especially to seeds are noteworthy. The molecular bases of iron sensing and signaling are gradually emerging, as well.
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Affiliation(s)
- Jeeyon Jeong
- Department of Biology, Amherst College, Amherst, MA 01002, United States
| | - Aleks Merkovich
- Department of Biology, Amherst College, Amherst, MA 01002, United States
| | - Madeline Clyne
- Department of Biology, Amherst College, Amherst, MA 01002, United States
| | - Erin L Connolly
- Department of Plant Science, Penn State University, University Park, PA 16802, United States.
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83
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Martinez-Cuenca MR, Primo-Capella A, Quiñones A, Bermejo A, Forner-Giner MA. Rootstock influence on iron uptake responses in Citrus leaves and their regulation under the Fe paradox effect. PeerJ 2017; 5:e3553. [PMID: 28966887 PMCID: PMC5619235 DOI: 10.7717/peerj.3553] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Accepted: 06/16/2017] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND AND AIMS This work evaluates the regulation of iron uptake responses in Citrus leaves and their involvement in the Fe paradox effect. METHODS Experiments were performed in field-grown 'Navelina' trees grafted onto two Cleopatra mandarin × Poncirus trifoliata (L.) Raf. hybrids with different Fe-chlorosis symptoms: 030146 (non-chlorotic) and 030122 (chlorotic). RESULTS Chlorotic leaves were smaller than non-chlorotic ones for both dry weight (DW) and area basis, and exhibited marked photosynthetic state affection, but reduced catalase and peroxidase enzymatic activities. Although both samples had a similar total Fe concentration on DW, it was lower in chlorotic leaves when expressed on an area basis. A similar pattern was observed for the total Fe concentration in the apoplast and cell sap and in active Fe (Fe2+) concentration. FRO2 gene expression and ferric chelate reductase (FC-R) activity were also lower in chlorotic samples, while HA1 and IRT1 were more induced. Despite similar apoplasmic pH, K+/Ca2+ was higher in chlorotic leaves, and both citrate and malate concentrations in total tissue and apoplast fluid were lower. CONCLUSION (1) The rootstock influences Fe acquisition system in the leaf; (2) the increased sensitivity to Fe-deficiency as revealed by chlorosis and decreased biomass, was correlated with lower FC-R activity and lower organic acid level in leaf cells, which could cause a decreased Fe mobility and trigger other Fe-stress responses in this organ to enhance acidification and Fe uptake inside cells; and (3) the chlorosis paradox phenomenon in citrus likely occurs as a combination of a marked FC-R activity impairment in the leaf and the strong growth inhibition in this organ.
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Affiliation(s)
- Mary-Rus Martinez-Cuenca
- Centre of Citriculture and Plant Production, Valencian Agricultural and Research Institute (IVIA), Moncada, Valencia, Spain
| | - Amparo Primo-Capella
- Centre of Citriculture and Plant Production, Valencian Agricultural and Research Institute (IVIA), Moncada, Valencia, Spain
| | - Ana Quiñones
- Centre of Sustainable Agricultural Development, Valencian Agricultural and Research Institute (IVIA), Moncada, Valencia, Spain
| | - Almudena Bermejo
- Centre of Citriculture and Plant Production, Valencian Agricultural and Research Institute (IVIA), Moncada, Valencia, Spain
| | - Maria Angeles Forner-Giner
- Centre of Citriculture and Plant Production, Valencian Agricultural and Research Institute (IVIA), Moncada, Valencia, Spain
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84
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Connorton JM, Balk J, Rodríguez-Celma J. Iron homeostasis in plants - a brief overview. Metallomics 2017; 9:813-823. [PMID: 28686269 PMCID: PMC5708359 DOI: 10.1039/c7mt00136c] [Citation(s) in RCA: 181] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Accepted: 06/28/2017] [Indexed: 01/04/2023]
Abstract
Iron plays a crucial role in biochemistry and is an essential micronutrient for plants and humans alike. Although plentiful in the Earth's crust it is not usually found in a form readily accessible for plants to use. They must therefore sense and interact with their environment, and have evolved two different molecular strategies to take up iron in the root. Once inside, iron is complexed with chelators and distributed to sink tissues where it is used predominantly in the production of enzyme cofactors or components of electron transport chains. The processes of iron uptake, distribution and metabolism are overseen by tight regulatory mechanisms, at the transcriptional and post-transcriptional level, to avoid iron concentrations building to toxic excess. Iron is also loaded into seeds, where it is stored in vacuoles or in ferritin. This is important for human nutrition as seeds form the edible parts of many crop species. As such, increasing iron in seeds and other tissues is a major goal for biofortification efforts by both traditional breeding and biotechnological approaches.
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Affiliation(s)
- James M Connorton
- John Innes Centre and University of East Anglia, Norwich Research Park, Norwich, NR4 7UH, UK.
| | - Janneke Balk
- John Innes Centre and University of East Anglia, Norwich Research Park, Norwich, NR4 7UH, UK.
| | - Jorge Rodríguez-Celma
- John Innes Centre and University of East Anglia, Norwich Research Park, Norwich, NR4 7UH, UK.
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85
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Balzergue C, Dartevelle T, Godon C, Laugier E, Meisrimler C, Teulon JM, Creff A, Bissler M, Brouchoud C, Hagège A, Müller J, Chiarenza S, Javot H, Becuwe-Linka N, David P, Péret B, Delannoy E, Thibaud MC, Armengaud J, Abel S, Pellequer JL, Nussaume L, Desnos T. Low phosphate activates STOP1-ALMT1 to rapidly inhibit root cell elongation. Nat Commun 2017; 8:15300. [PMID: 28504266 PMCID: PMC5440667 DOI: 10.1038/ncomms15300] [Citation(s) in RCA: 210] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Accepted: 03/16/2017] [Indexed: 12/12/2022] Open
Abstract
Environmental cues profoundly modulate cell proliferation and cell elongation to inform and direct plant growth and development. External phosphate (Pi) limitation inhibits primary root growth in many plant species. However, the underlying Pi sensory mechanisms are unknown. Here we genetically uncouple two Pi sensing pathways in the root apex of Arabidopsis thaliana. First, the rapid inhibition of cell elongation in the transition zone is controlled by transcription factor STOP1, by its direct target, ALMT1, encoding a malate channel, and by ferroxidase LPR1, which together mediate Fe and peroxidase-dependent cell wall stiffening. Second, during the subsequent slow inhibition of cell proliferation in the apical meristem, which is mediated by LPR1-dependent, but largely STOP1–ALMT1-independent, Fe and callose accumulate in the stem cell niche, leading to meristem reduction. Our work uncovers STOP1 and ALMT1 as a signalling pathway of low Pi availability and exuded malate as an unexpected apoplastic inhibitor of root cell wall expansion. Low Pi availability inhibits primary root growth, but the sensory mechanisms are not known. Here the authors uncover a signalling pathway regulating Pi-mediated root growth inhibition in Arabidopsis, involving the transcription factor STOP1, its direct target ALMT1, a malate channel, and ferroxidase LPR1.
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Affiliation(s)
- Coline Balzergue
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
| | - Thibault Dartevelle
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
| | - Christian Godon
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
| | - Edith Laugier
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
| | - Claudia Meisrimler
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
| | - Jean-Marie Teulon
- CNRS, IBS, Grenoble F-38044, France.,CEA, IBS, Grenoble F-38044, France.,Université Grenoble Alpes, IBS, Grenoble F-38044, France
| | - Audrey Creff
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
| | - Marie Bissler
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
| | - Corinne Brouchoud
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
| | - Agnès Hagège
- Commissariat à l'Energie Atomique et aux énergies alternatives, Service de Biologie et de Toxicologie Nucléaire, Laboratoire d'Etude des Protéines Cibles, 30200 Bagnols sur Cèze, France
| | - Jens Müller
- Department of Molecular Signal Processing, Leibniz Institute of Plant Biochemistry, Halle (Saale) 06120, Germany
| | - Serge Chiarenza
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
| | - Hélène Javot
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
| | - Noëlle Becuwe-Linka
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
| | - Pascale David
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
| | - Benjamin Péret
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
| | - Etienne Delannoy
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
| | - Marie-Christine Thibaud
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
| | - Jean Armengaud
- CEA, DRF, JOLIOT/DMTS/SPI/Li2D, Laboratory 'Innovative Technologies for Detection and Diagnostics', Bagnols-sur-Cèze F-30200, France
| | - Steffen Abel
- Department of Molecular Signal Processing, Leibniz Institute of Plant Biochemistry, Halle (Saale) 06120, Germany
| | - Jean-Luc Pellequer
- CNRS, IBS, Grenoble F-38044, France.,CEA, IBS, Grenoble F-38044, France.,Université Grenoble Alpes, IBS, Grenoble F-38044, France
| | - Laurent Nussaume
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
| | - Thierry Desnos
- Laboratoire de Biologie du Développement des Plantes, Institut de Biosciences et Biotechnology Aix-Marseille, Commissariat à l'Energie Atomique et aux énergies alternatives, Saint-Paul-Lez-Durance 13108, France.,Centre National de la Recherche Scientifique, UMR 7265 Biol. Végét. &Microbiol. Environ., Saint-Paul-Lez-Durance, France.,Aix-Marseille Université, UMR 7265, Marseille, France
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86
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Malate-dependent Fe accumulation is a critical checkpoint in the root developmental response to low phosphate. Proc Natl Acad Sci U S A 2017; 114:E3563-E3572. [PMID: 28400510 DOI: 10.1073/pnas.1701952114] [Citation(s) in RCA: 166] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Low phosphate (Pi) availability constrains plant development and seed production in both natural and agricultural ecosystems. When Pi is scarce, modifications of root system architecture (RSA) enhance the soil exploration ability of the plant and lead to an increase in Pi uptake. In Arabidopsis, an iron-dependent mechanism reprograms primary root growth in response to low Pi availability. This program is activated upon contact of the root tip with low-Pi media and induces premature cell differentiation and the arrest of mitotic activity in the root apical meristem, resulting in a short-root phenotype. However, the mechanisms that regulate the primary root response to Pi-limiting conditions remain largely unknown. Here we report on the isolation and characterization of two low-Pi insensitive mutants (lpi5 and lpi6), which have a long-root phenotype when grown in low-Pi media. Cellular, genomic, and transcriptomic analysis of low-Pi insensitive mutants revealed that the genes previously shown to underlie Arabidopsis Al tolerance via root malate exudation, known as SENSITIVE TO PROTON RHIZOTOXICITY (STOP1) and ALUMINUM ACTIVATED MALATE TRANSPORTER 1 (ALMT1), represent a critical checkpoint in the root developmental response to Pi starvation in Arabidopsis thaliana Our results also show that exogenous malate can rescue the long-root phenotype of lpi5 and lpi6 Malate exudation is required for the accumulation of Fe in the apoplast of meristematic cells, triggering the differentiation of meristematic cells in response to Pi deprivation.
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87
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Wu L, Ueda Y, Lai S, Frei M. Shoot tolerance mechanisms to iron toxicity in rice (
Oryza sativa
L.). PLANT, CELL & ENVIRONMENT 2017; 40:570-584. [PMID: 0 DOI: 10.1111/pce.12733] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 03/07/2016] [Accepted: 03/08/2016] [Indexed: 05/08/2023]
Affiliation(s)
- Lin‐Bo Wu
- Plant Nutrition, Institute of Crop Science and Resource Conservation (INRES)University of Bonn Karlrobert‐Kreiten‐Straße 13 53115 Bonn Germany
| | - Yoshiaki Ueda
- Plant Nutrition, Institute of Crop Science and Resource Conservation (INRES)University of Bonn Karlrobert‐Kreiten‐Straße 13 53115 Bonn Germany
| | - Shang‐Kun Lai
- Agricultral CollegeYangzhou University 225009 Yangzhou China
| | - Michael Frei
- Plant Nutrition, Institute of Crop Science and Resource Conservation (INRES)University of Bonn Karlrobert‐Kreiten‐Straße 13 53115 Bonn Germany
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88
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Curie C, Mari S. New routes for plant iron mining. THE NEW PHYTOLOGIST 2017; 214:521-525. [PMID: 27918629 DOI: 10.1111/nph.14364] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Accepted: 10/22/2016] [Indexed: 05/03/2023]
Abstract
Contents 521 I. 521 II. 522 III. 523 IV. 524 525 References 525 SUMMARY: Plant iron (Fe) uptake relies to a large extent on the capacity of cells to control and extract Fe pools safely conserved in extracytoplasmic environments such as the apoplast and vacuoles, at least as much as on the transport machinery nested in plasma membranes. Recent studies on root and embryo Fe nutrition support this assertion and show that the root Fe-deficiency response also includes the dynamic use of a large Fe reservoir bound to cell wall components in the root apoplast, secretion in the apoplast of phenolic compounds of the coumarin family, which solubilize Fe in calcareous soils, and inhibition of suberization of endodermal cells in order to allow apoplastic and transcellular radial transport of Fe. All of these responses are regulated by the stress hormones ethylene and abscisic acid (ABA), suggesting an integrated strategy within the root to adapt to Fe shortage. For its nutrition, the embryo has developed both an original uptake mechanism, in which ascorbate is effluxed to chemically reduce Fe3+ to the transport-competent Fe2+ form, and an efficient strategy to control utilization of a large Fe pool in vacuoles. This review will attempt to summarize exciting new insights into the diverse routes that Fe takes to feed plant tissues.
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Affiliation(s)
- Catherine Curie
- Laboratoire de Biochimie et Physiologie Moléculaire des Plantes CNRS UMR5004/INRA/Université Montpellier/SupAgro, Place Viala, 34060, Montpellier CEDEX 1, France
| | - Stéphane Mari
- Laboratoire de Biochimie et Physiologie Moléculaire des Plantes CNRS UMR5004/INRA/Université Montpellier/SupAgro, Place Viala, 34060, Montpellier CEDEX 1, France
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89
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Guo K, Tu L, Wang P, Du X, Ye S, Luo M, Zhang X. Ascorbate Alleviates Fe Deficiency-Induced Stress in Cotton ( Gossypium hirsutum) by Modulating ABA Levels. FRONTIERS IN PLANT SCIENCE 2017; 7:1997. [PMID: 28101095 PMCID: PMC5209387 DOI: 10.3389/fpls.2016.01997] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Accepted: 12/16/2016] [Indexed: 05/30/2023]
Abstract
Fe deficiency causes significant losses to crop productivity and quality. To understand better the mechanisms of plant responses to Fe deficiency, we used an in vitro cotton ovule culture system. We found that Fe deficiency suppressed the development of ovules and fibers, and led to tissue browning. RNA-seq analysis showed that the myo-inositol and galacturonic acid pathways were activated and cytosolic APX (ascorbate peroxidase) was suppressed in Fe-deficient treated fibers, which increased ASC (ascorbate) concentrations to prevent tissue browning. Suppression of cytosolic APX by RNAi in cotton increased ASC contents and delayed tissue browning by maintaining ferric reduction activity under Fe-deficient conditions. Meanwhile, APX RNAi line also exhibited the activation of expression of iron-regulated transporter (IRT1) and ferric reductase-oxidase2 (FRO2) to adapt to Fe deficiency. Abscisic acid (ABA) levels were significantly decreased in Fe-deficient treated ovules and fibers, while the upregulated expression of ABA biosynthesis genes and suppression of ABA degradation genes in Fe-deficient ovules slowed down the decreased of ABA in cytosolic APX suppressed lines to delay the tissue browning. Moreover, the application of ABA in Fe-deficient medium suppressed the development of tissue browning and completely restored the ferric reduction activity. In addition, ABA 8'-hydroxylase gene (GhABAH1) overexpressed cotton has a decreased level of ABA and shows more sensitivity to Fe deficiency. Based on the results, we speculate that ASC could improve the tolerance to Fe deficiency through activating Fe uptake and maintaining ABA levels in cotton ovules and fibers, which in turn reduces symptom formation.
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Affiliation(s)
- Kai Guo
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural UniversityWuhan, China
| | - Lili Tu
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural UniversityWuhan, China
| | - Pengcheng Wang
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural UniversityWuhan, China
| | - Xueqiong Du
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural UniversityWuhan, China
| | - Shue Ye
- Key Laboratory of Biotechnology and Crop Quality Improvement of Ministry of Agriculture, Biotechnology Research Center, Southwest UniversityChongqing, China
| | - Ming Luo
- Key Laboratory of Biotechnology and Crop Quality Improvement of Ministry of Agriculture, Biotechnology Research Center, Southwest UniversityChongqing, China
| | - Xianlong Zhang
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural UniversityWuhan, China
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90
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Ibeas MA, Grant-Grant S, Navarro N, Perez MF, Roschzttardtz H. Dynamic Subcellular Localization of Iron during Embryo Development in Brassicaceae Seeds. FRONTIERS IN PLANT SCIENCE 2017; 8:2186. [PMID: 29312417 PMCID: PMC5744184 DOI: 10.3389/fpls.2017.02186] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 12/12/2017] [Indexed: 05/08/2023]
Abstract
Iron is an essential micronutrient for plants. Little is know about how iron is loaded in embryo during seed development. In this article we used Perls/DAB staining in order to reveal iron localization at the cellular and subcellular levels in different Brassicaceae seed species. In dry seeds of Brassica napus, Nasturtium officinale, Lepidium sativum, Camelina sativa, and Brassica oleracea iron localizes in vacuoles of cells surrounding provasculature in cotyledons and hypocotyl. Using B. napus and N. officinale as model plants we determined where iron localizes during seed development. Our results indicate that iron is not detectable by Perls/DAB staining in heart stage embryo cells. Interestingly, at torpedo development stage iron localizes in nuclei of different cells type, including integument, free cell endosperm and almost all embryo cells. Later, iron is detected in cytoplasmic structures in different embryo cell types. Our results indicate that iron accumulates in nuclei in specific stages of embryo maturation before to be localized in vacuoles of cells surrounding provasculature in mature seeds.
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Affiliation(s)
- Miguel A. Ibeas
- Departamento de Genética Molecular y Microbiología, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Susana Grant-Grant
- Departamento de Genética Molecular y Microbiología, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Nathalia Navarro
- Departamento de Genética Molecular y Microbiología, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - M. F. Perez
- Departamento de Ecología, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Hannetz Roschzttardtz
- Departamento de Genética Molecular y Microbiología, Pontificia Universidad Católica de Chile, Santiago, Chile
- *Correspondence: Hannetz Roschzttardtz,
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91
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Tan GZH, Das Bhowmik SS, Hoang TML, Karbaschi MR, Johnson AAT, Williams B, Mundree SG. Finger on the Pulse: Pumping Iron into Chickpea. FRONTIERS IN PLANT SCIENCE 2017; 8:1755. [PMID: 29081785 PMCID: PMC5646179 DOI: 10.3389/fpls.2017.01755] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Accepted: 09/25/2017] [Indexed: 05/21/2023]
Abstract
Iron deficiency is a major problem in both developing and developed countries, and much of this can be attributed to insufficient dietary intake. Over the past decades several measures, such as supplementation and food fortification, have helped to alleviate this problem. However, their associated costs limit their accessibility and effectiveness, particularly amongst the financially constrained. A more affordable and sustainable option that can be implemented alongside existing measures is biofortification. To date, much work has been invested into staples like cereals and root crops-this has culminated in the successful generation of high iron-accumulating lines in rice and pearl millet. More recently, pulses have gained attention as targets for biofortification. Being secondary staples rich in protein, they are a nutritional complement to the traditional starchy staples. Despite the relative youth of this interest, considerable advances have already been made concerning the biofortification of pulses. Several studies have been conducted in bean, chickpea, lentil, and pea to assess existing germplasm for high iron-accumulating traits. However, little is known about the molecular workings behind these traits, particularly in a leguminous context, and biofortification via genetic modification (GM) remains to be attempted. This review examines the current state of the iron biofortification in pulses, particularly chickpea. The challenges concerning biofortification in pulses are also discussed. Specifically, the potential application of transgenic technology is explored, with focus on the genes that have been successfully used in biofortification efforts in rice.
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Affiliation(s)
- Grace Z. H. Tan
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, QLD, Australia
| | - Sudipta S. Das Bhowmik
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, QLD, Australia
| | - Thi M. L. Hoang
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, QLD, Australia
| | - Mohammad R. Karbaschi
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, QLD, Australia
| | | | - Brett Williams
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, QLD, Australia
| | - Sagadevan G. Mundree
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, QLD, Australia
- *Correspondence: Sagadevan G. Mundree
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92
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Roschzttardtz H, Bustos S, Coronas MF, Ibeas MA, Grant-Grant S, Vargas-Pérez J. Increasing Provasculature Complexity in the Arabidopsis Embryo May Increase Total Iron Content in Seeds: A Hypothesis. FRONTIERS IN PLANT SCIENCE 2017. [PMID: 28642774 PMCID: PMC5463184 DOI: 10.3389/fpls.2017.00960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Anemia due to iron deficiency is a worldwide issue, affecting mainly children and women. Seed iron is a major source of this micronutrient for feeding, however, in most crops these levels are too low to meet daily needs. Thus, increasing iron allocation and its storage in seeds can represent an important step to enhance iron provision for humans and animals. Our knowledge on seed iron homeostasis is mainly based on studies performed in the model plant Arabidopsis thaliana, where iron accumulates in endodermis cells surrounding the embryo provasculature. It has been reported that cotyledon provasculature pattern complexity can be modified, thus we hypothesize that changes in the complexity of embryo vein patterns may affect total iron content in Arabidopsis seeds. This approach could be used as basis to develop strategies aimed to biofortify seeds.
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93
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Bashir K, Rasheed S, Kobayashi T, Seki M, Nishizawa NK. Regulating Subcellular Metal Homeostasis: The Key to Crop Improvement. FRONTIERS IN PLANT SCIENCE 2016; 7:1192. [PMID: 27547212 PMCID: PMC4974246 DOI: 10.3389/fpls.2016.01192] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 07/25/2016] [Indexed: 05/21/2023]
Abstract
Iron (Fe), zinc (Zn), manganese (Mn), and copper (Cu) are essential micronutrient mineral elements for living organisms, as they regulate essential cellular processes, such as chlorophyll synthesis and photosynthesis (Fe, Cu, and Mn), respiration (Fe and Cu), and transcription (Zn). The storage and distribution of these minerals in various cellular organelles is strictly regulated to ensure optimal metabolic rates. Alteration of the balance in uptake, distribution, and/or storage of these minerals severely impairs cellular metabolism and significantly affects plant growth and development. Thus, any change in the metal profile of a cellular compartment significantly affects metabolism. Different subcellular compartments are suggested to be linked through complex retrograde signaling networks to regulate cellular metal homeostasis. Various genes regulating cellular and subcellular metal distribution have been identified and characterized. Understanding the role of these transporters is extremely important to elaborate the signaling between various subcellular compartments. Moreover, modulation of the proteins involved in cellular metal homeostasis may help in the regulation of metabolism, adaptability to a diverse range of environmental conditions, and biofortification. Here, we review progress in the understanding of different subcellular metal transport components in plants and discuss the prospects of regulating cellular metabolism and strategies to develop biofortified crop plants.
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Affiliation(s)
- Khurram Bashir
- Plant Genomics Network Research Team, Center for Sustainable Resource Science, RIKEN, Yokohama Campus, YokohamaJapan
| | - Sultana Rasheed
- Plant Genomics Network Research Team, Center for Sustainable Resource Science, RIKEN, Yokohama Campus, YokohamaJapan
- Kihara Institute for Biological Research, Yokohama City University, YokohamaJapan
| | - Takanori Kobayashi
- Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, NonoichiJapan
| | - Motoaki Seki
- Plant Genomics Network Research Team, Center for Sustainable Resource Science, RIKEN, Yokohama Campus, YokohamaJapan
- Kihara Institute for Biological Research, Yokohama City University, YokohamaJapan
- Core Research for Evolutional Science and Technology – Japan Science and Technology Agency, KawaguchiJapan
| | - Naoko K. Nishizawa
- Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, NonoichiJapan
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, TokyoJapan
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94
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Flis P, Ouerdane L, Grillet L, Curie C, Mari S, Lobinski R. Inventory of metal complexes circulating in plant fluids: a reliable method based on HPLC coupled with dual elemental and high-resolution molecular mass spectrometric detection. THE NEW PHYTOLOGIST 2016; 211:1129-41. [PMID: 27111838 DOI: 10.1111/nph.13964] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Accepted: 03/10/2016] [Indexed: 05/16/2023]
Abstract
Description of metal species in plant fluids such as xylem, phloem or related saps remains a complex challenge usually addressed either by liquid chromatography-mass spectrometry, X-ray analysis or computational prediction. To date, none of these techniques has achieved a complete and true picture of metal-containing species in plant fluids, especially for the least concentrated complexes. Here, we present a generic analytical methodology for a large-scale (> 10 metals, > 50 metal complexes) detection, identification and semiquantitative determination of metal complexes in the xylem and embryo sac liquid of the green pea, Pisum sativum. The procedure is based on direct injection using hydrophilic interaction chromatography with dual detection by elemental (inductively coupled plasma mass spectrometry) and molecular (high-resolution electrospray mass spectrometry) mass spectrometric detection. Numerous and novel complexes of iron(II), iron(III), copper(II), zinc, manganese, cobalt(II), cobalt(III), magnesium, calcium, nickel and molybdenum(IV) with several ligands including nicotianamine, citrate, malate, histidine, glutamine, aspartic acid, asparagine, phenylalanine and others are observed in pea fluids and discussed. This methodology provides a large inventory of various types of metal complexes, which is a significant asset for future biochemical and genetic studies into metal transport/homeostasis.
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Affiliation(s)
- Paulina Flis
- Laboratoire de Chimie Analytique Bio-Inorganique et Environnement (LCABIE), Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les Matériaux (UMR5254), Centre National de la Recherche Scientifique, Université de Pau et des Pays de l'Adour, Pau Cedex 9, F-64063, France
| | - Laurent Ouerdane
- Laboratoire de Chimie Analytique Bio-Inorganique et Environnement (LCABIE), Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les Matériaux (UMR5254), Centre National de la Recherche Scientifique, Université de Pau et des Pays de l'Adour, Pau Cedex 9, F-64063, France
| | - Louis Grillet
- Laboratoire de Biochimie et Physiologie Moléculaire des Plantes (BPMP), Institut de Biologie Intégrative des Plantes, Centre National de la Recherche Scientifique (UMR5004), Institut National de la Recherche Agronomique, Université Montpellier II, Ecole Nationale Supérieure d'Agronomie, Montpellier Cedex 2, F-34060, France
| | - Catherine Curie
- Laboratoire de Biochimie et Physiologie Moléculaire des Plantes (BPMP), Institut de Biologie Intégrative des Plantes, Centre National de la Recherche Scientifique (UMR5004), Institut National de la Recherche Agronomique, Université Montpellier II, Ecole Nationale Supérieure d'Agronomie, Montpellier Cedex 2, F-34060, France
| | - Stéphane Mari
- Laboratoire de Biochimie et Physiologie Moléculaire des Plantes (BPMP), Institut de Biologie Intégrative des Plantes, Centre National de la Recherche Scientifique (UMR5004), Institut National de la Recherche Agronomique, Université Montpellier II, Ecole Nationale Supérieure d'Agronomie, Montpellier Cedex 2, F-34060, France
| | - Ryszard Lobinski
- Laboratoire de Chimie Analytique Bio-Inorganique et Environnement (LCABIE), Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les Matériaux (UMR5254), Centre National de la Recherche Scientifique, Université de Pau et des Pays de l'Adour, Pau Cedex 9, F-64063, France
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95
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Ghssein G, Brutesco C, Ouerdane L, Fojcik C, Izaute A, Wang S, Hajjar C, Lobinski R, Lemaire D, Richaud P, Voulhoux R, Espaillat A, Cava F, Pignol D, Borezée-Durant E, Arnoux P. Biosynthesis of a broad-spectrum nicotianamine-like metallophore in Staphylococcus aureus. Science 2016; 352:1105-9. [PMID: 27230378 DOI: 10.1126/science.aaf1018] [Citation(s) in RCA: 133] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Accepted: 04/12/2016] [Indexed: 12/11/2022]
Abstract
Metal acquisition is a vital microbial process in metal-scarce environments, such as inside a host. Using metabolomic exploration, targeted mutagenesis, and biochemical analysis, we discovered an operon in Staphylococcus aureus that encodes the different functions required for the biosynthesis and trafficking of a broad-spectrum metallophore related to plant nicotianamine (here called staphylopine). The biosynthesis of staphylopine reveals the association of three enzyme activities: a histidine racemase, an enzyme distantly related to nicotianamine synthase, and a staphylopine dehydrogenase belonging to the DUF2338 family. Staphylopine is involved in nickel, cobalt, zinc, copper, and iron acquisition, depending on the growth conditions. This biosynthetic pathway is conserved across other pathogens, thus underscoring the importance of this metal acquisition strategy in infection.
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Affiliation(s)
- Ghassan Ghssein
- Laboratoire de Bioénergétique Cellulaire, Institut de Biosciences et Biotechnology Aix-Marseille (BIAM), Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), 13108 Saint-Paul-lès-Durance, France. UMR 7265, Centre National de Recherche Scientifique, Saint-Paul-lès-Durance, France. Aix Marseille Université, Marseille, France
| | - Catherine Brutesco
- Laboratoire de Bioénergétique Cellulaire, Institut de Biosciences et Biotechnology Aix-Marseille (BIAM), Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), 13108 Saint-Paul-lès-Durance, France. UMR 7265, Centre National de Recherche Scientifique, Saint-Paul-lès-Durance, France. Aix Marseille Université, Marseille, France
| | - Laurent Ouerdane
- Université de Pau et des Pays de l'Adour/CNRS, Laboratoire de Chimie Analytique Bio-inorganique et Environnement, IPREM-UMR5254, Hélioparc, 2, Avenue Angot, 64053 Pau, France
| | - Clémentine Fojcik
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| | - Amélie Izaute
- Laboratoire de Bioénergétique Cellulaire, Institut de Biosciences et Biotechnology Aix-Marseille (BIAM), Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), 13108 Saint-Paul-lès-Durance, France. UMR 7265, Centre National de Recherche Scientifique, Saint-Paul-lès-Durance, France. Aix Marseille Université, Marseille, France
| | - Shuanglong Wang
- Université de Pau et des Pays de l'Adour/CNRS, Laboratoire de Chimie Analytique Bio-inorganique et Environnement, IPREM-UMR5254, Hélioparc, 2, Avenue Angot, 64053 Pau, France
| | - Christine Hajjar
- Laboratoire de Bioénergétique Cellulaire, Institut de Biosciences et Biotechnology Aix-Marseille (BIAM), Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), 13108 Saint-Paul-lès-Durance, France. UMR 7265, Centre National de Recherche Scientifique, Saint-Paul-lès-Durance, France. Aix Marseille Université, Marseille, France
| | - Ryszard Lobinski
- Université de Pau et des Pays de l'Adour/CNRS, Laboratoire de Chimie Analytique Bio-inorganique et Environnement, IPREM-UMR5254, Hélioparc, 2, Avenue Angot, 64053 Pau, France
| | - David Lemaire
- UMR 7265, Centre National de Recherche Scientifique, Saint-Paul-lès-Durance, France. Aix Marseille Université, Marseille, France. Lab Interact Protein Metal, BIAM, CEA, 13108 Saint-Paul-lès-Durance, France
| | - Pierre Richaud
- UMR 7265, Centre National de Recherche Scientifique, Saint-Paul-lès-Durance, France. Aix Marseille Université, Marseille, France. Lab Bioenerget Biotechnol Bacteries et Microalgues, BIAM, CEA, 13108 Saint-Paul-lès-Durance, France
| | - Romé Voulhoux
- CNRS et Aix-Marseille Université, Laboratoire d'Ingénierie des Systèmes Macromoléculaires (UMR7255), Institut de Microbiologie de la Méditerranée, Marseille, France
| | - Akbar Espaillat
- Laboratory for Molecular Infection Medicine Sweden, Department of Molecular Biology, Umeå Centre for Microbial Research, Umeå University, Umeå, Sweden
| | - Felipe Cava
- Laboratory for Molecular Infection Medicine Sweden, Department of Molecular Biology, Umeå Centre for Microbial Research, Umeå University, Umeå, Sweden
| | - David Pignol
- Laboratoire de Bioénergétique Cellulaire, Institut de Biosciences et Biotechnology Aix-Marseille (BIAM), Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), 13108 Saint-Paul-lès-Durance, France. UMR 7265, Centre National de Recherche Scientifique, Saint-Paul-lès-Durance, France. Aix Marseille Université, Marseille, France
| | - Elise Borezée-Durant
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| | - Pascal Arnoux
- Laboratoire de Bioénergétique Cellulaire, Institut de Biosciences et Biotechnology Aix-Marseille (BIAM), Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), 13108 Saint-Paul-lès-Durance, France. UMR 7265, Centre National de Recherche Scientifique, Saint-Paul-lès-Durance, France. Aix Marseille Université, Marseille, France.
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96
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Lo JC, Tsednee M, Lo YC, Yang SC, Hu JM, Ishizaki K, Kohchi T, Lee DC, Yeh KC. Evolutionary analysis of iron (Fe) acquisition system in Marchantia polymorpha. THE NEW PHYTOLOGIST 2016; 211:569-83. [PMID: 26948158 DOI: 10.1111/nph.13922] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Accepted: 02/02/2016] [Indexed: 05/18/2023]
Abstract
To acquire appropriate iron (Fe), vascular plants have developed two unique strategies, the reduction-based strategy I of nongraminaceous plants for Fe(2+) and the chelation-based strategy II of graminaceous plants for Fe(3+) . However, the mechanism of Fe uptake in bryophytes, the earliest diverging branch of land plants and dominant in gametophyte generation is less clear. Fe isotope fractionation analysis demonstrated that the liverwort Marchantia polymorpha uses reduction-based Fe acquisition. Enhanced activities of ferric chelate reductase and proton ATPase were detected under Fe-deficient conditions. However, M. polymorpha did not show mugineic acid family phytosiderophores, the key components of strategy II, or the precursor nicotianamine. Five ZIP (ZRT/IRT-like protein) homologs were identified and speculated to be involved in Fe uptake in M. polymorpha. MpZIP3 knockdown conferred reduced growth under Fe-deficient conditions, and MpZIP3 overexpression increased Fe content under excess Fe. Thus, a nonvascular liverwort, M. polymorpha, uses strategy I for Fe acquisition. This system may have been acquired in the common ancestor of land plants and coopted from the gametophyte to sporophyte generation in the evolution of land plants.
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Affiliation(s)
- Jing-Chi Lo
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan
- Institute of Plant Biology, National Taiwan University, Taipei, 10617, Taiwan
| | - Munkhtsetseg Tsednee
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan
| | - Ying-Chu Lo
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan
| | - Shun-Chung Yang
- Institute of Earth Sciences, Academia Sinica, Taipei, 11529, Taiwan
| | - Jer-Ming Hu
- Institute of Ecology and Evolutionary Biology, National Taiwan University, Taipei, 10617, Taiwan
| | - Kimitsune Ishizaki
- Graduate School of Science, Kobe University, 1-1 Rokkodai, Kobe, 657-8501, Japan
| | - Takayuki Kohchi
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502, Japan
| | - Der-Chuen Lee
- Institute of Earth Sciences, Academia Sinica, Taipei, 11529, Taiwan
| | - Kuo-Chen Yeh
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan
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97
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Tian Q, Zhang X, Yang A, Wang T, Zhang WH. CIPK23 is involved in iron acquisition of Arabidopsis by affecting ferric chelate reductase activity. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2016; 246:70-79. [PMID: 26993237 DOI: 10.1016/j.plantsci.2016.01.010] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2015] [Revised: 01/23/2016] [Accepted: 01/28/2016] [Indexed: 05/21/2023]
Abstract
Iron deficiency is one of the major limiting factors affecting quality and production of crops in calcareous soils. Numerous signaling molecules and transcription factors have been demonstrated to play a regulatory role in adaptation of plants to iron deficiency. However, the mechanisms underlying the iron deficiency-induced physiological processes remain to be fully dissected. Here, we demonstrated that the protein kinase CIPK23 was involved in iron acquisition. Lesion of CIPK23 rendered Arabidopsis mutants hypersensitive to iron deficiency, as evidenced by stronger chlorosis in young leaves and lower iron concentration than wild-type plants under iron-deficient conditions by down-regulating ferric chelate reductase activity. We found that iron deficiency evoked an increase in cytosolic Ca(2+) concentration and the elevated Ca(2+) would bind to CBL1/CBL9, leading to activation of CIPK23. These novel findings highlight the involvement of calcium-dependent CBL-CIPK23 complexes in the regulation of iron acquisition. Moreover, mutation of CIPK23 led to changes in contents of mineral elements, suggesting that CBL-CIPK23 complexes could be as "nutritional sensors" to sense and regulate the mineral homeostasis in Arabisopsis.
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Affiliation(s)
- Qiuying Tian
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, The Chinese Academy of Sciences, Beijing 100093, PR China
| | - Xinxin Zhang
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, The Chinese Academy of Sciences, Beijing 100093, PR China
| | - An Yang
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, The Chinese Academy of Sciences, Beijing 100093, PR China
| | - Tianzuo Wang
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, The Chinese Academy of Sciences, Beijing 100093, PR China
| | - Wen-Hao Zhang
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, The Chinese Academy of Sciences, Beijing 100093, PR China.
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98
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The effects of hydrothermal processing and germination on Fe speciation and Fe bioaccessibility to human intestinal Caco-2 cells in Tartary buckwheat. Food Chem 2016; 199:782-90. [DOI: 10.1016/j.foodchem.2015.12.071] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 11/13/2015] [Accepted: 12/16/2015] [Indexed: 11/17/2022]
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99
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Niu Y, DesMarais TL, Tong Z, Yao Y, Costa M. Oxidative stress alters global histone modification and DNA methylation. Free Radic Biol Med 2015; 82:22-8. [PMID: 25656994 PMCID: PMC4464695 DOI: 10.1016/j.freeradbiomed.2015.01.028] [Citation(s) in RCA: 217] [Impact Index Per Article: 24.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 01/07/2015] [Accepted: 01/26/2015] [Indexed: 02/07/2023]
Abstract
The JmjC domain-containing histone demethylases can remove histone lysine methylation and thereby regulate gene expression. The JmjC domain uses iron Fe(II) and α-ketoglutarate (αKG) as cofactors in an oxidative demethylation reaction via hydroxymethyl lysine. We hypothesize that reactive oxygen species will oxidize Fe(II) to Fe(III), thereby attenuating the activity of JmjC domain-containing histone demethylases. To minimize secondary responses from cells, extremely short periods of oxidative stress (3h) were used to investigate this question. Cells that were exposed to hydrogen peroxide (H2O2) for 3h exhibited increases in several histone methylation marks including H3K4me3 and decreases of histone acetylation marks including H3K9ac and H4K8ac; preincubation with ascorbate attenuated these changes. The oxidative stress level was measured by generation of 2',7'-dichlorofluorescein, GSH/GSSG ratio, and protein carbonyl content. A cell-free system indicated that H2O2 inhibited histone demethylase activity where increased Fe(II) rescued this inhibition. TET protein showed a decreased activity under oxidative stress. Cells exposed to a low-dose and long-term (3 weeks) oxidative stress also showed increased global levels of H3K4me3 and H3K27me3. However, these global methylation changes did not persist after washout. The cells exposed to short-term oxidative stress also appeared to have higher activity of class I/II histone deacetylase (HDAC) but not class III HDAC. In conclusion, we have found that oxidative stress transiently alters the epigenetic program process through modulating the activity of enzymes responsible for demethylation and deacetylation of histones.
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Affiliation(s)
- Yingmei Niu
- Occupational Disease and Toxicology Department, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China 100020
| | - Thomas L DesMarais
- Department of Environmental Medicine, New York University School of Medicine, Tuxedo, NY 10987, USA
| | - Zhaohui Tong
- Department of Respiratory and Critical Care Medicine, Beijing Institute of Respiratory Medicine, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China 100020.
| | - Yixin Yao
- Department of Environmental Medicine, New York University School of Medicine, Tuxedo, NY 10987, USA; Shanghai Jiao-Tong University School of Public Health, Shanghai, China 200025.
| | - Max Costa
- Department of Environmental Medicine, New York University School of Medicine, Tuxedo, NY 10987, USA; Department of Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, NY 100016, USA.
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100
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Müller J, Toev T, Heisters M, Teller J, Moore K, Hause G, Dinesh D, Bürstenbinder K, Abel S. Iron-Dependent Callose Deposition Adjusts Root Meristem Maintenance to Phosphate Availability. Dev Cell 2015; 33:216-30. [DOI: 10.1016/j.devcel.2015.02.007] [Citation(s) in RCA: 160] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Revised: 12/12/2014] [Accepted: 02/09/2015] [Indexed: 12/11/2022]
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