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Lilay GH, Castro PH, Campilho A, Assunção AGL. The Arabidopsis bZIP19 and bZIP23 Activity Requires Zinc Deficiency - Insight on Regulation From Complementation Lines. FRONTIERS IN PLANT SCIENCE 2018; 9:1955. [PMID: 30723487 PMCID: PMC6349776 DOI: 10.3389/fpls.2018.01955] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Accepted: 12/17/2018] [Indexed: 05/06/2023]
Abstract
All living organisms require zinc as an essential micronutrient. Maintaining appropriate intracellular zinc supply, and avoiding deficiency or toxic excess, requires a tight regulation of zinc homeostasis. In Arabidopsis, bZIP19 and bZIP23 (basic-leucine zipper) transcription factors are the central regulators of the zinc deficiency response. Their targets include members of the ZIP (Zrt/Irt-like Protein) transporter family, involved in cellular zinc uptake, which are up-regulated at zinc deficiency. However, the mechanisms by which these transcription factors are regulated by cellular zinc status are not yet known. Here, to further our insight, we took advantage of the zinc deficiency hypersensitive phenotype of the bzip19 bzip23 double mutant, and used it as background to produce complementation lines of each Arabidopsis F-bZIP transcription factor, including bZIP24. On these lines, we performed complementation and localization studies, analyzed the transcript level of a subset of putative target genes, and performed elemental tissue profiling. We find evidence supporting that the zinc-dependent activity of bZIP19 and bZIP23 is modulated by zinc at protein level, in the nucleus, where cellular zinc sufficiency represses their activity and zinc deficiency is required. In addition, we show that these two transcription factors are functionally redundant to a large extent, and that differential tissue-specific expression patterns might, at least partly, explain distinct regulatory activities. Finally, we show that bZIP24 does not play a central role in the Zn deficiency response. Overall, we provide novel information that advances our understanding of the regulatory activity of bZIP19 and bZIP23.
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Affiliation(s)
- Grmay H. Lilay
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Frederiksberg, Denmark
| | - Pedro Humberto Castro
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Frederiksberg, Denmark
| | - Ana Campilho
- CIBIO/InBIO – Research Centre in Biodiversity and Genetic Resources, University of Porto, Vairão, Portugal
- Department of Biology, University of Porto, Porto, Portugal
| | - Ana G. L. Assunção
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, University of Copenhagen, Frederiksberg, Denmark
- CIBIO/InBIO – Research Centre in Biodiversity and Genetic Resources, University of Porto, Vairão, Portugal
- *Correspondence: Ana G. L. Assunção,
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152
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Barabasz A, Palusińska M, Papierniak A, Kendziorek M, Kozak K, Williams LE, Antosiewicz DM. Functional Analysis of NtZIP4B and Zn Status-Dependent Expression Pattern of Tobacco ZIP Genes. FRONTIERS IN PLANT SCIENCE 2018; 9:1984. [PMID: 30687374 PMCID: PMC6335357 DOI: 10.3389/fpls.2018.01984] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Accepted: 12/20/2018] [Indexed: 05/06/2023]
Abstract
Tobacco is frequently considered as a plant useful for phytoremediation of metal-contaminated soil, despite the mechanisms for regulation of uptake and accumulation being largely unknown. Here we cloned and characterized a new tobacco Zn and Cd transporter NtZIP4B from the ZIP family (ZRT-IRT-Like proteins). It complemented the Zn-uptake defective yeast mutant zrt1zrt2, and rendered the wild type DY1457 yeast more sensitive to Cd. Bioinformatic analysis and transient expression of the NtZIP4B-GFP fusion protein in tobacco leaves indicated its localization to the plasma membrane. Real-time q-PCR based analysis showed that it is expressed in all vegetative organs with the highest level in leaves. The Zn status determined transcript abundance; NtZIP4B was upregulated by Zn-deficiency and downregulated by Zn excess. At the tissue level, in roots NtZIP4B is expressed in the vasculature of the middle part of the roots and in surrounding tissues including the root epidermis; in leaves primarily in the vasculature. Bioinformatic analysis identified two copies of ZIP4 in tobacco, NtZIP4A and NtZIP4B with 97.57% homology at the amino acid level, with the same expression pattern for both, indicating a high degree of functional redundancy. Moreover, the present study provides new insights into the coordinated function of NtZIP1, NtZIP2, NtZIP4, NtZIP5, NtZIP8, NtIRT1, and NtIRT1-like in response to low-to-high Zn status. Leaves were the major site of NtZIP4, NtZIP5, and NtZIP8 expression, and roots for NtZIP1, NtZIP2, NtIRT1, and NtIRT1-like. Contrasting expression level in the apical and basal root parts indicates distinct roles in root-specific processes likely contributing to the regulation of Zn root-to-shoot translocation. In summary, new insight into the role of ZIP genes in Zn homeostasis pointing to their overlapping and complementary functions, offers opportunities for strategies to modify Zn and Cd root/shoot partition in tobacco.
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Affiliation(s)
- Anna Barabasz
- Faculty of Biology, Institute of Experimental Plant Biology and Biotechnology, University of Warsaw, Warsaw, Poland
- *Correspondence: Anna Barabasz, Danuta Maria Antosiewicz,
| | - Małgorzata Palusińska
- Faculty of Biology, Institute of Experimental Plant Biology and Biotechnology, University of Warsaw, Warsaw, Poland
| | - Anna Papierniak
- Faculty of Biology, Institute of Experimental Plant Biology and Biotechnology, University of Warsaw, Warsaw, Poland
| | - Maria Kendziorek
- Faculty of Biology, Institute of Experimental Plant Biology and Biotechnology, University of Warsaw, Warsaw, Poland
| | - Katarzyna Kozak
- Faculty of Biology, Institute of Experimental Plant Biology and Biotechnology, University of Warsaw, Warsaw, Poland
| | | | - Danuta Maria Antosiewicz
- Faculty of Biology, Institute of Experimental Plant Biology and Biotechnology, University of Warsaw, Warsaw, Poland
- *Correspondence: Anna Barabasz, Danuta Maria Antosiewicz,
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153
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Papierniak A, Kozak K, Kendziorek M, Barabasz A, Palusińska M, Tiuryn J, Paterczyk B, Williams LE, Antosiewicz DM. Contribution of NtZIP1-Like to the Regulation of Zn Homeostasis. FRONTIERS IN PLANT SCIENCE 2018; 9:185. [PMID: 29503658 PMCID: PMC5820362 DOI: 10.3389/fpls.2018.00185] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Accepted: 01/31/2018] [Indexed: 05/20/2023]
Abstract
Tobacco has frequently been suggested as a candidate plant species for use in phytoremediation of metal contaminated soil but knowledge on the regulation of its metal-homeostasis is still in the infancy. To identify new tobacco metal transport genes that are involved in Zn homeostasis a bioinformatics study using the tobacco genome information together with expression analysis was performed. Ten new tobacco metal transport genes from the ZIP, NRAMP, MTP, and MRP/ABCC families were identified with expression levels in leaves that were modified by exposure to Zn excess. Following exposure to high Zn there was upregulation of NtZIP11-like, NtNRAMP3, three isoforms of NtMTP2, three MRP/ABCC genes (NtMRP5-like, NtMRP10-like, and NtMRP14 like) and downregulation of NtZIP1-like and NtZIP4. This suggests their involvement in several processes governing the response to Zn-related stress and in the efficiency of Zn accumulation (uptake, sequestration, and redistribution). Further detailed analysis of NtZIP1-like provided evidence that it is localized at the plasma membrane and is involved in Zn but not Fe and Cd transport. NtZIP1-like is expressed in the roots and shoots, and is regulated developmentally and in a tissue-specific manner. It is highly upregulated by Zn deficiency in the leaves and the root basal region but not in the root apical zone (region of maturation and absorption containing root hairs). Thus NtZIP1-like is unlikely to be responsible for Zn uptake by the root apical region but rather in the uptake by root cells within the already mature basal zone. It is downregulated by Zn excess suggesting it is involved in a mechanism to protect the root and leaf cells from accumulating excess Zn.
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Affiliation(s)
- Anna Papierniak
- Institute of Experimental Plant Biology and Biotechnology, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Katarzyna Kozak
- Institute of Experimental Plant Biology and Biotechnology, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Maria Kendziorek
- Institute of Experimental Plant Biology and Biotechnology, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Anna Barabasz
- Institute of Experimental Plant Biology and Biotechnology, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Małgorzata Palusińska
- Institute of Experimental Plant Biology and Biotechnology, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Jerzy Tiuryn
- Faculty of Mathematics, Informatics, and Mechanics, University of Warsaw, Warsaw, Poland
| | - Bohdan Paterczyk
- Laboratory of Electron and Confocal Microscopy, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | | | - Danuta M. Antosiewicz
- Institute of Experimental Plant Biology and Biotechnology, Faculty of Biology, University of Warsaw, Warsaw, Poland
- *Correspondence: Danuta M. Antosiewicz,
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154
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Garcia-Oliveira AL, Chander S, Ortiz R, Menkir A, Gedil M. Genetic Basis and Breeding Perspectives of Grain Iron and Zinc Enrichment in Cereals. FRONTIERS IN PLANT SCIENCE 2018; 9:937. [PMID: 30013590 PMCID: PMC6036604 DOI: 10.3389/fpls.2018.00937] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Accepted: 06/11/2018] [Indexed: 05/18/2023]
Abstract
Micronutrient deficiency, also known as "hidden hunger," is an increasingly serious global challenge to humankind. Among the mineral elements, Fe (Iron) and Zn (Zinc) have earned recognition as micronutrients of outstanding and diverse biological relevance, as well as of clinical importance to global public health. The inherently low Fe and Zn content and poor bioavailability in cereal grains seems to be at the root of these mineral nutrient deficiencies, especially in the developing world where cereal-based diets are the most important sources of calories. The emerging physiological and molecular understanding of the uptake of Fe and Zn and their translocation in cereal grains regrettably also indicates accumulation of other toxic metals, with chemically similar properties, together with these mineral elements. This review article emphasizes breeding to develop bioavailable Fe- and Zn-efficient cereal cultivars to overcome malnutrition while minimizing the risks of toxic metals. We attempt to critically examine the genetic diversity regarding these nutritionally important traits as well as the progress in terms of quantitative genetics. We sought to integrate findings from the rhizosphere with Fe and Zn accumulation in grain, and to discuss the promoters as well as the anti-nutritional factors affecting Fe and Zn bioavailability in humans while restricting the content of toxic metals.
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Affiliation(s)
- Ana Luisa Garcia-Oliveira
- International Institute of Tropical Agriculture, Ibadan, Nigeria
- *Correspondence: Ana Luisa Garcia-Oliveira
| | - Subhash Chander
- Department of Genetics & Plant Breeding, Chaudhary Charan Singh Haryana Agricultural University, Hisar, India
| | - Rodomiro Ortiz
- Department of Plant Breeding, Swedish University of Agricultural Sciences, Alnarp, Sweden
- Rodomiro Ortiz
| | - Abebe Menkir
- International Institute of Tropical Agriculture, Ibadan, Nigeria
| | - Melaku Gedil
- International Institute of Tropical Agriculture, Ibadan, Nigeria
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155
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Vigani G, Bohic S, Faoro F, Vekemans B, Vincze L, Terzano R. Cellular Fractionation and Nanoscopic X-Ray Fluorescence Imaging Analyses Reveal Changes of Zinc Distribution in Leaf Cells of Iron-Deficient Plants. FRONTIERS IN PLANT SCIENCE 2018; 9:1112. [PMID: 30123229 PMCID: PMC6085429 DOI: 10.3389/fpls.2018.01112] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 07/10/2018] [Indexed: 05/07/2023]
Abstract
Multilevel interactions among nutrients occur in the soil-plant system. Among them, Fe and Zn homeostasis in plants are of great relevance because of their importance for plant and human nutrition. However, the mechanisms underlying the interplay between Fe and Zn in plants are still poorly understood. In order to elucidate how Zn interacts with Fe homeostasis, it is crucial to assess Zn distribution either in the plant tissues or within the cells. In this study, we investigated the subcellular Zn distribution in Fe-deficient leaf cells of cucumber plants by using two different approaches: cellular fractionation coupled with inductively coupled plasma mass spectrometry (ICP/MS) and nanoscopic synchrotron X-ray fluorescence imaging. Fe-deficient leaves showed a strong accumulation of Zn as well as a strong alteration of the organelles' ultrastructure at the cellular level. The cellular fractionation-ICP/MS approach revealed that Zn accumulates in both chloroplasts and mitochondria of Fe deficient leaves. Nano-XRF imaging revealed Zn accumulation in chloroplast and mitochondrial compartments, with a higher concentration in chloroplasts. Such results show that (i) both approaches are suitable to investigate Zn distribution at the subcellular level and (ii) cellular Fe and Zn interactions take place mainly in the organelles, especially in the chloroplasts.
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Affiliation(s)
- Gianpiero Vigani
- Plant Physiology Unit, Department of Life Sciences and Systems Biology, University of Turin, Turin, Italy
- Department of Agricultural and Environmental Sciences, Production, Landscape, Agroenergy, University of Milano, Milan, Italy
- *Correspondence: Gianpiero Vigani, ; Roberto Terzano,
| | - Sylvain Bohic
- European Synchrotron Radiation Facility, NINA Beamline, Grenoble, France
| | - Franco Faoro
- Department of Agricultural and Environmental Sciences, Production, Landscape, Agroenergy, University of Milano, Milan, Italy
| | - Bart Vekemans
- Department of Analytical Chemistry, Ghent University, Ghent, Belgium
| | - Lazlo Vincze
- Department of Analytical Chemistry, Ghent University, Ghent, Belgium
| | - Roberto Terzano
- Department of Soil, Plant and Food Sciences, University of Bari, Bari, Italy
- *Correspondence: Gianpiero Vigani, ; Roberto Terzano,
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156
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Bothe H, Słomka A. Divergent biology of facultative heavy metal plants. JOURNAL OF PLANT PHYSIOLOGY 2017; 219:45-61. [PMID: 29028613 DOI: 10.1016/j.jplph.2017.08.014] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 08/29/2017] [Accepted: 08/30/2017] [Indexed: 05/04/2023]
Abstract
Among heavy metal plants (the metallophytes), facultative species can live both in soils contaminated by an excess of heavy metals and in non-affected sites. In contrast, obligate metallophytes are restricted to polluted areas. Metallophytes offer a fascinating biology, due to the fact that species have developed different strategies to cope with the adverse conditions of heavy metal soils. The literature distinguishes between hyperaccumulating, accumulating, tolerant and excluding metallophytes, but the borderline between these categories is blurred. Due to the fact that heavy metal soils are dry, nutrient limited and are not uniform but have a patchy distribution in many instances, drought-tolerant or low nutrient demanding species are often regarded as metallophytes in the literature. In only a few cases, the concentrations of heavy metals in soils are so toxic that only a few specifically adapted plants, the genuine metallophytes, can cope with these adverse soil conditions. Current molecular biological studies focus on the genetically amenable and hyperaccumulating Arabidopsis halleri and Noccaea (Thlaspi) caerulescens of the Brassicaceae. Armeria maritima ssp. halleri utilizes glands for the excretion of heavy metals and is, therefore, a heavy metal excluder. The two endemic zinc violets of Western Europe, Viola lutea ssp. calaminaria of the Aachen-Liège area and Viola lutea ssp. westfalica of the Pb-Cu-ditch of Blankenrode, Eastern Westphalia, as well as Viola tricolor ecotypes of Eastern Europe, keep their cells free of excess heavy metals by arbuscular mycorrhizal fungi which bind heavy metals. The Caryophyllaceae, Silene vulgaris f. humilis and Minuartia verna, apparently discard leaves when overloaded with heavy metals. All Central European metallophytes have close relatives that grow in areas outside of heavy metal soils, mainly in the Alps, and have, therefore, been considered as relicts of the glacial epoch in the past. However, the current literature favours the idea that hyperaccumulation of heavy metals serves plants as deterrent against attack by feeding animals (termed elemental defense hypothesis). The capability to hyperaccumulate heavy metals in A. halleri and N. caerulescens is achieved by duplications and alterations of the cis-regulatory properties of genes coding for heavy metal transporting/excreting proteins. Several metallophytes have developed ecotypes with a varying content of such heavy metal transporters as an adaption to the specific toxicity of a heavy metal site.
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Affiliation(s)
- Hermann Bothe
- Botanical Institute, The University of Cologne, Zuelpicher Str. 47b, 50674 Cologne, Germany.
| | - Aneta Słomka
- Department of Plant Cytology and Embryology, Jagiellonian University, Gronostajowa 9 Str., 30-387 Cracow, Poland.
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157
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Petrová Š, Rezek J, Soudek P, Vaněk T. Preliminary study of phytoremediation of brownfield soil contaminated by PAHs. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 599-600:572-580. [PMID: 28494283 DOI: 10.1016/j.scitotenv.2017.04.163] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 04/19/2017] [Accepted: 04/21/2017] [Indexed: 05/16/2023]
Abstract
Our project was aimed at improving a brownfield in the city of Kladno, where an old steel producing facility used to be in operation. Ecological risk is mainly caused by the processing of co-products during coal production (tars, oils). Knowledge of toxicology and environmental aspects can help us protect human health and the environment. Primarily, we focused on soil sampling and identification of pollutants. Results showed that organic contamination on the site is very high. Average concentration of total petroleum carbon in the soil was about 13g/kg DW, which is much more than the maximum allowed concentration. For selection of suitable plant species for phytoremediation at the site, experiments were conducted in a greenhouse. Biomass growth, root morphology, and pigment content in the leaves of Brassica napus var. Opus-C1 and Sorghum×drummondii var. Honey Graze BMR plants were studied. Plant analysis confirmed that polyaromatic hydrocarbons (PAHs) accumulated in the shoots of both plant species. B. napus plants grown on Poldi soil in a greenhouse were able to survive the toxicity of PAHs in soil, and their ability to accumulate PAHs from soil was evident. However, more studies are needed to decide if the plants are usable for phytoremediation of this brownfield.
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Affiliation(s)
- Šárka Petrová
- Laboratory of Plant Biotechnologies, Institute of Experimental Botany AS CR, Prague, Czech Republic
| | - Jan Rezek
- Laboratory of Plant Biotechnologies, Institute of Experimental Botany AS CR, Prague, Czech Republic
| | - Petr Soudek
- Laboratory of Plant Biotechnologies, Institute of Experimental Botany AS CR, Prague, Czech Republic
| | - Tomáš Vaněk
- Laboratory of Plant Biotechnologies, Institute of Experimental Botany AS CR, Prague, Czech Republic.
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158
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Abreu I, Saéz Á, Castro-Rodríguez R, Escudero V, Rodríguez-Haas B, Senovilla M, Larue C, Grolimund D, Tejada-Jiménez M, Imperial J, González-Guerrero M. Medicago truncatula Zinc-Iron Permease6 provides zinc to rhizobia-infected nodule cells. PLANT, CELL & ENVIRONMENT 2017; 40:2706-2719. [PMID: 28732146 DOI: 10.1111/pce.13035] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2017] [Revised: 06/07/2017] [Accepted: 07/09/2017] [Indexed: 05/16/2023]
Abstract
Zinc is a micronutrient required for symbiotic nitrogen fixation. It has been proposed that in model legume Medicago truncatula, zinc is delivered by the root vasculature into the nodule and released in the infection/differentiation zone. There, transporters must introduce this element into rhizobia-infected cells to metallate the apoproteins that use zinc as a cofactor. MtZIP6 (Medtr4g083570) is an M. truncatula Zinc-Iron Permease (ZIP) that is expressed only in roots and nodules, with the highest expression levels in the infection/differentiation zone. Immunolocalization studies indicate that it is located in the plasma membrane of nodule rhizobia-infected cells. Down-regulating MtZIP6 expression levels with RNAi does not result in any strong phenotype when plants are fed mineral nitrogen. However, these plants displayed severe growth defects when they depended on nitrogen fixed by their nodules, losing of 80% of their nitrogenase activity. The reduction of this activity was likely an indirect effect of zinc being retained in the infection/differentiation zone and not reaching the cytosol of rhizobia-infected cells. These data are consistent with a model in which MtZIP6 would be responsible for zinc uptake by rhizobia-infected nodule cells in the infection/differentiation zone.
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Affiliation(s)
- Isidro Abreu
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA), Campus de Montegancedo, Crta, M-40 km 38, 28223, Pozuelo de Alarcón, Madrid, Spain
| | - Ángela Saéz
- ECOLAB, Université de Toulouse, CNRS, INPT, UPS, F-31062, Toulouse, France
| | - Rosario Castro-Rodríguez
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA), Campus de Montegancedo, Crta, M-40 km 38, 28223, Pozuelo de Alarcón, Madrid, Spain
| | - Viviana Escudero
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA), Campus de Montegancedo, Crta, M-40 km 38, 28223, Pozuelo de Alarcón, Madrid, Spain
| | - Benjamín Rodríguez-Haas
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA), Campus de Montegancedo, Crta, M-40 km 38, 28223, Pozuelo de Alarcón, Madrid, Spain
| | - Marta Senovilla
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA), Campus de Montegancedo, Crta, M-40 km 38, 28223, Pozuelo de Alarcón, Madrid, Spain
| | - Camille Larue
- ECOLAB, Université de Toulouse, CNRS, INPT, UPS, F-31062, Toulouse, France
| | - Daniel Grolimund
- Paul Scherrer Institute, Swiss Light Source, microXAS Beamline Project, CH-5232, Villigen, Switzerland
| | - Manuel Tejada-Jiménez
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA), Campus de Montegancedo, Crta, M-40 km 38, 28223, Pozuelo de Alarcón, Madrid, Spain
| | - Juan Imperial
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA), Campus de Montegancedo, Crta, M-40 km 38, 28223, Pozuelo de Alarcón, Madrid, Spain
- Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - Manuel González-Guerrero
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA), Campus de Montegancedo, Crta, M-40 km 38, 28223, Pozuelo de Alarcón, Madrid, Spain
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159
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Banakar R, Alvarez Fernandez A, Díaz-Benito P, Abadia J, Capell T, Christou P. Phytosiderophores determine thresholds for iron and zinc accumulation in biofortified rice endosperm while inhibiting the accumulation of cadmium. JOURNAL OF EXPERIMENTAL BOTANY 2017; 68:4983-4995. [PMID: 29048564 PMCID: PMC5853871 DOI: 10.1093/jxb/erx304] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2017] [Accepted: 08/04/2017] [Indexed: 05/04/2023]
Abstract
Nicotianamine (NA) and 2'-deoxymugenic acid (DMA) are metal-chelating ligands that promote the accumulation of metals in rice endosperm, but it is unclear how these phytosiderophores regulate the levels of different metals and limit their accumulation. In this study, transgenic rice plants producing high levels of NA and DMA accumulated up to 4-fold more iron (Fe) and 2-fold more zinc (Zn) in the endosperm compared with wild-type plants. The distribution of Fe and Zn in vegetative tissues suggested that both metals are sequestered as a buffering mechanism to avoid overloading the seeds. The buffering mechanism involves the modulation of genes encoding metal transporters in the roots and aboveground vegetative tissues. As well as accumulating more Fe and Zn, the endosperm of the transgenic plants accumulated less cadmium (Cd), suggesting that higher levels of Fe and Zn competitively inhibit Cd accumulation. Our data show that although there is a strict upper limit for Fe (~22.5 µg g-1 dry weight) and Zn (~84 µg g-1 dry weight) accumulation in the endosperm, the careful selection of strategies to increase endosperm loading with essential minerals can also limit the accumulation of toxic metals such as Cd, thus further increasing the nutritional value of rice.
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Affiliation(s)
- Raviraj Banakar
- Departament de Producció Vegetal i Ciència Forestal, Universitat de Lleida-Agrotecnio Center Lleida, Spain
| | - Ana Alvarez Fernandez
- Department of Plant Nutrition, Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas (CSIC), Zaragoza, Spain
| | - Pablo Díaz-Benito
- Department of Plant Nutrition, Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas (CSIC), Zaragoza, Spain
| | - Javier Abadia
- Department of Plant Nutrition, Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas (CSIC), Zaragoza, Spain
| | - Teresa Capell
- Departament de Producció Vegetal i Ciència Forestal, Universitat de Lleida-Agrotecnio Center Lleida, Spain
| | - Paul Christou
- Departament de Producció Vegetal i Ciència Forestal, Universitat de Lleida-Agrotecnio Center Lleida, Spain
- ICREA, Catalan Institute for Research and Advanced Studies, Passeig Lluís Companys, Barcelona, Spain
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160
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Benáková M, Ahmadi H, Dučaiová Z, Tylová E, Clemens S, Tůma J. Effects of Cd and Zn on physiological and anatomical properties of hydroponically grown Brassica napus plants. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:20705-20716. [PMID: 28714046 DOI: 10.1007/s11356-017-9697-7] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 07/04/2017] [Indexed: 06/07/2023]
Abstract
Clarifying the connection between metal exposure and anatomical changes represents an important challenge for a better understanding of plant phytoextraction potential. A hydroponic screening experiment was carried out to evaluate the effects of combined interactions of Cd and Zn on mineral uptake (Mg, K, Ca, Na) and on the physiological and anatomical characteristics of Brassica napus L cv. Cadeli, Viking, and Navajo. Plants were exposed to 5 μM Cd (CdCl2), 10 μM Zn (ZnSO4), or both Cd + Zn, for 14 days. Cadmium exposure led to a significant reduction in root growth, shoot biomass, and chlorophyll content. After Cd-only and Cd + Zn treatment, primary root tips became thicker and pericycle cells were enlarged compared to the control and Zn-only treatment. No differences between metals were observed under UV excitation, where all treatments showed more intensive autofluorescence connected with lignin/suberin accumulation compared to control conditions. The highest concentrations of Cd and Zn were found in the roots of all tested plants, and translocation factors did not exceed the threshold of 1.0. The root mineral composition was not affected by any treatment. In the shoots, the Mg concentration slightly increased after Cd-only and Cd + Zn treatments, whereas Zn-only treatment caused a sharp decrease in Ca content. Slight increases in K were seen after the addition of Zn. Significantly higher concentrations of Na were induced by Cd- or Zn-only treatment.
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Affiliation(s)
- Martina Benáková
- Department of Biology, Faculty of Science, University of Hradec Králové, Rokitanského 62, 500 03, Hradec Králové, Czech Republic.
| | - Hassan Ahmadi
- Department of Plant Physiology, University of Bayreuth, Bayreuth, Germany
| | - Zuzana Dučaiová
- Department of Biology, Faculty of Science, University of Hradec Králové, Rokitanského 62, 500 03, Hradec Králové, Czech Republic
| | - Edita Tylová
- Department of Experimental Plant Biology, Charles University, Prague, Czech Republic
| | - Stephan Clemens
- Department of Plant Physiology, University of Bayreuth, Bayreuth, Germany
| | - Jiří Tůma
- Department of Biology, Faculty of Science, University of Hradec Králové, Rokitanského 62, 500 03, Hradec Králové, Czech Republic
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161
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Campos ACAL, Kruijer W, Alexander R, Akkers RC, Danku J, Salt DE, Aarts MGM. Natural variation in Arabidopsis thaliana reveals shoot ionome, biomass, and gene expression changes as biomarkers for zinc deficiency tolerance. JOURNAL OF EXPERIMENTAL BOTANY 2017; 68:3643-3656. [PMID: 28859376 DOI: 10.1093/jxb/erx191] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 05/20/2017] [Indexed: 05/12/2023]
Abstract
Zinc (Zn) is an essential nutrient for plants, with a crucial role as a cofactor for many enzymes. Approximately one-third of the global arable land area is Zn deficient, leading to reduced crop yield and quality. To improve crop tolerance to Zn deficiency, it is important to understand the mechanisms plants have adopted to tolerate suboptimal Zn supply. In this study, physiological and molecular aspects of traits related to Zn deficiency tolerance were examined in a panel of 19 Arabidopsis thaliana accessions. Accessions showed a larger variation for shoot biomass than for Zn concentration, indicating that they have different requirements for their minimal Zn concentration required for growth. Accessions with a higher tolerance to Zn deficiency showed an increased expression of the Zn deficiency-responsive genes ZIP4 and IRT3 in comparison with Zn deficiency-sensitive accessions. Changes in the shoot ionome, as a result of the Zn treatment of the plants, were used to build a multinomial logistic regression model able to distinguish plants regarding their Zn nutritional status. This set of biomarkers, reflecting the A. thaliana response to Zn deficiency and Zn deficiency tolerance, can be useful for future studies aiming to improve the performance and Zn status of crop plants grown under suboptimal Zn concentrations.
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Affiliation(s)
- Ana Carolina A L Campos
- Laboratory of Genetics, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
- Institute of Biological and Environmental Sciences, University of Aberdeen, Cruickshank Building, Aberdeen AB24 3UU, UK
| | - Willem Kruijer
- Biometris, Wageningen University and Research, PO Box 100, 6700AC Wageningen, The Netherlands
| | - Ross Alexander
- Laboratory of Genetics, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
- School of Life Sciences, John Muir Building, Heriot Watt University, Edinburgh EH14 4AS, UK
| | - Robert C Akkers
- Laboratory of Genetics, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
| | - John Danku
- Institute of Biological and Environmental Sciences, University of Aberdeen, Cruickshank Building, Aberdeen AB24 3UU, UK
| | - David E Salt
- Institute of Biological and Environmental Sciences, University of Aberdeen, Cruickshank Building, Aberdeen AB24 3UU, UK
| | - Mark G M Aarts
- Laboratory of Genetics, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
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162
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Peroxide reduction by a metal-dependent catalase in Nostoc punctiforme (cyanobacteria). Appl Microbiol Biotechnol 2017; 101:3781-3800. [DOI: 10.1007/s00253-017-8130-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Revised: 11/09/2016] [Accepted: 01/13/2017] [Indexed: 11/27/2022]
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163
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Nair PMG, Chung IM. Regulation of morphological, molecular and nutrient status in Arabidopsis thaliana seedlings in response to ZnO nanoparticles and Zn ion exposure. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 575:187-198. [PMID: 27741454 DOI: 10.1016/j.scitotenv.2016.10.017] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Revised: 09/28/2016] [Accepted: 10/03/2016] [Indexed: 06/06/2023]
Abstract
This study examined the mechanism of toxicity in Arabidopsis thaliana seedlings to zinc oxide nanoparticles (ZnO NPs) and zinc (Zn) ions. We subjected plants to different ZnO NPs and Zn ion concentrations (0, 20, 50, 100 and 200mg/L) and analyzed resulting morphological changes, transcriptional regulation of genes involved in Zn-homeostasis, macro- and microelement homeostasis, as well as auxin regulation. Except for 20mg/L, the fresh weight and primary root length was reduced after exposure to all other concentrations of Zn ion and ZnO NP concentrations. An increase in lateral root formation (19 and 32%) was observed after exposure to 20 and 50mg/L of Zn ions respectively; whereas 20mg/L ZnO NPs treatment triggered a 9% increase in lateral root formation. Both qualitative, using Zynpyr-1 fluorescent probe and quantitative analysis revealed Zn uptake and translocation from roots to shoots after Zn ion exposure. However, ZnO NPs-treated seedlings resulted in no root to shoot translocation and Zn accumulation was mainly located in root tips, primary-lateral root junctions and root- shoot junctions. The macronutrients viz. P (1.34mg/kg DW), K (13.29mg/kg DW), S (1.29mg/kg DW) and micronutrients Cu (0.004mg/kg DW) and Fe (0.345mg/kg DW) contents were highly decreased as a result of exposure to 200mg/L of Zn ions. Similarly, the highest reduction of P (2.30mg/kg DW), K (6.36mg/kg DW), S (2.63mg/kg DW) and Cu (0.004mg/kg DW) was observed after exposure to 200mg/L of ZnO NPs. Gene regulation studies indicated the transcriptional modulation of various genes involved in Zn, macro- and micro nutrient homeostasis as well as hormone regulation. Taken together, it was observed that the mechanism of toxicity of Zn ions and ZnO NPs were different. These findings will help to design safer strategies for the application of ZnO NPs as plant fertilizer without compromising the morphological and nutritional qualities as well as for the future phytoremediation purposes.
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Affiliation(s)
| | - Ill Min Chung
- Department of Applied Bioscience, College of Life and Environmental Sciences, Konkuk University, Seoul, South Korea.
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164
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Fu XZ, Zhou X, Xing F, Ling LL, Chun CP, Cao L, Aarts MGM, Peng LZ. Genome-Wide Identification, Cloning and Functional Analysis of the Zinc/Iron-Regulated Transporter-Like Protein ( ZIP) Gene Family in Trifoliate Orange ( Poncirus trifoliata L. Raf.). FRONTIERS IN PLANT SCIENCE 2017; 8:588. [PMID: 28469631 PMCID: PMC5395618 DOI: 10.3389/fpls.2017.00588] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Accepted: 03/31/2017] [Indexed: 05/18/2023]
Abstract
Zinc (Zn) and iron (Fe) deficiency are widespread among citrus plants, but the molecular mechanisms regarding uptake and transport of these two essential metal ions in citrus are still unclear. In the present study, 12 members of the Zn/Fe-regulated transporter (ZRT/IRT)-related protein (ZIP) gene family were identified and isolated from a widely used citrus rootstock, trifoliate orange (Poncirus trifoliata L. Raf.), and the genes were correspondingly named as PtZIPs according to the sequence and functional similarity to Arabidopsis thaliana ZIPs. The 12 PtZIP genes were predicted to encode proteins of 334-419 amino acids, harboring 6-9 putative transmembrane (TM) domains. All of the PtZIP proteins contained the highly conserved ZIP signature sequences in TM-IV, and nine of them showed a variable region rich in histidine residues between TM-III and TM-IV. Phylogenetic analysis subdivided the PtZIPs into four groups, similar as found for the ZIP family of A. thaliana, with clustered PtZIPs sharing a similar gene structure. Expression analysis showed that the PtZIP genes were very differently induced in roots and leaves under conditions of Zn, Fe and Mn deficiency. Yeast complementation tests indicated that PtIRT1, PtZIP1, PtZIP2, PtZIP3, and PtZIP12 were able to complement the zrt1zrt2 mutant, which was deficient in Zn uptake; PtIRT1 and PtZIP7 were able to complement the fet3fet4 mutant, which was deficient in Fe uptake, and PtIRT1 was able to complement the smf1 mutant, which was deficient in Mn uptake, suggesting their respective functions in Zn, Fe, and Mn transport. The present study broadens our understanding of metal ion uptake and transport and functional divergence of the various PtZIP genes in citrus plants.
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Affiliation(s)
- Xing-Zheng Fu
- Citrus Research Institute, Southwest UniversityChongqing, China
- Citrus Research Institute, Chinese Academy of Agricultural SciencesChongqing, China
| | - Xue Zhou
- Citrus Research Institute, Southwest UniversityChongqing, China
- Citrus Research Institute, Chinese Academy of Agricultural SciencesChongqing, China
| | - Fei Xing
- Citrus Research Institute, Southwest UniversityChongqing, China
| | - Li-Li Ling
- Citrus Research Institute, Southwest UniversityChongqing, China
- Citrus Research Institute, Chinese Academy of Agricultural SciencesChongqing, China
| | - Chang-Pin Chun
- Citrus Research Institute, Southwest UniversityChongqing, China
- Citrus Research Institute, Chinese Academy of Agricultural SciencesChongqing, China
| | - Li Cao
- Citrus Research Institute, Southwest UniversityChongqing, China
- Citrus Research Institute, Chinese Academy of Agricultural SciencesChongqing, China
| | - Mark G. M. Aarts
- Laboratory of Genetics, Wageningen UniversityWageningen, Netherlands
| | - Liang-Zhi Peng
- Citrus Research Institute, Southwest UniversityChongqing, China
- Citrus Research Institute, Chinese Academy of Agricultural SciencesChongqing, China
- *Correspondence: Liang-Zhi Peng
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165
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Kumar V, Sharma A, Dhunna G, Chawla A, Bhardwaj R, Thukral AK. A tabulated review on distribution of heavy metals in various plants. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:2210-2260. [PMID: 27726084 DOI: 10.1007/s11356-016-7747-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 09/18/2016] [Indexed: 06/06/2023]
Abstract
Plants are a rich source of elements, and knowledge of their elemental composition determines their use for various purposes, especially for food and medicine. Therefore, it is necessary to create a database of the elemental composition of plants. The present review focuses on the concentration of various heavy metals as reported by various workers from time to time by using different sophisticated techniques. Cluster analysis was applied on the basis of mean values of heavy metals in plants. Co, Cu, and Cr have similar proximities. Cluster analysis was also applied to different families on the basis of their heavy metal contents. Elaeagnaceae, Adoxaceae, Thymelaeaceae, Cupressaceae, and Acoraceae had close proximities with each other. First three components of principal component analysis explained 95.7 % of the total variance. Factor analysis explained four underlying factors for heavy metal analysis. Factor 1 explained for 26.5 % of the total variance and had maximum loadings on Co, Cu, and Cr. Of the total variance, 21.7 % was explained by factor 2 and had maximum loadings on Zn and Cd. Factor 3 accounted for 19.2 % of the total variance and had maximum loadings on Ni and Pb. Mn had maximum loading on factor 4. The mean values of heavy metals as listed in this paper are Cu (18.7 μg/g dw), Mn (99.67 μg/g dw), Cr (22.9 μg/g dw), Co (19.7 μg/g dw), As (1.25 μg/g dw), Hg (0.17 μg/g dw), Zn (94.0 μg/g dw), Pb (6.93 μg/g dw), Cd (26.9 μg/g dw), Ni (19.9 μg/g dw), and Sb (0.25 μg/g dw).
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Affiliation(s)
- Vinod Kumar
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, Punjab, 143005, India.
| | - Anket Sharma
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, Punjab, 143005, India
| | - Geeta Dhunna
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, Punjab, 143005, India
| | - Amit Chawla
- High Altitude Biology Division, CSIR Institute of Himalayan Bioresource Technology (Council for Scientific and Industrial Research), Palampur, Himachal Pradesh, 176061, India
| | - Renu Bhardwaj
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, Punjab, 143005, India.
| | - Ashwani Kumar Thukral
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, Punjab, 143005, India
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166
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Viktorova J, Jandova Z, Madlenakova M, Prouzova P, Bartunek V, Vrchotova B, Lovecka P, Musilova L, Macek T. Native Phytoremediation Potential of Urtica dioica for Removal of PCBs and Heavy Metals Can Be Improved by Genetic Manipulations Using Constitutive CaMV 35S Promoter. PLoS One 2016; 11:e0167927. [PMID: 27930707 PMCID: PMC5145202 DOI: 10.1371/journal.pone.0167927] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Accepted: 11/22/2016] [Indexed: 01/20/2023] Open
Abstract
Although stinging nettle (Urtica dioica) has been shown to reduce HM (heavy metal) content in soil, its wider phytoremediation potential has been neglected. Urtica dioica was cultivated in soils contaminated with HMs or polychlorinated biphenyls (PCBs). After four months, up to 33% of the less chlorinated biphenyls and 8% of HMs (Zn, Pb, Cd) had been removed. Bacteria were isolated from the plant tissue, with the endophytic bacteria Bacillus shackletonii and Streptomyces badius shown to have the most significant effect. These bacteria demonstrated not only benefits for plant growth, but also extreme tolerance to As, Zn and Pb. Despite these results, the native phytoremediation potential of nettles could be improved by biotechnologies. Transient expression was used to investigate the functionality of the most common constitutive promoter, CaMV 35S in Urtica dioica. This showed the expression of the CUP and bphC transgenes. Collectively, our findings suggest that remediation by stinging nettle could have a much wider range of applications than previously thought.
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Affiliation(s)
- Jitka Viktorova
- UCT Prague, Faculty of Food and Biochemical Technology, Department of Biochemistry and Microbiology, Technicka 3, Prague, Czech Republic
| | - Zuzana Jandova
- UCT Prague, Faculty of Food and Biochemical Technology, Department of Biochemistry and Microbiology, Technicka 3, Prague, Czech Republic
| | - Michaela Madlenakova
- UCT Prague, Faculty of Food and Biochemical Technology, Department of Biochemistry and Microbiology, Technicka 3, Prague, Czech Republic
| | - Petra Prouzova
- UCT Prague, Faculty of Food and Biochemical Technology, Department of Biochemistry and Microbiology, Technicka 3, Prague, Czech Republic
| | - Vilem Bartunek
- UCT Prague, Faculty of Chemical Technology, Department of Inorganic Chemistry, Technicka 3, Prague, Czech Republic
| | - Blanka Vrchotova
- UCT Prague, Faculty of Food and Biochemical Technology, Department of Biochemistry and Microbiology, Technicka 3, Prague, Czech Republic
| | - Petra Lovecka
- UCT Prague, Faculty of Food and Biochemical Technology, Department of Biochemistry and Microbiology, Technicka 3, Prague, Czech Republic
| | - Lucie Musilova
- UCT Prague, Faculty of Food and Biochemical Technology, Department of Biochemistry and Microbiology, Technicka 3, Prague, Czech Republic
| | - Tomas Macek
- UCT Prague, Faculty of Food and Biochemical Technology, Department of Biochemistry and Microbiology, Technicka 3, Prague, Czech Republic
- * E-mail:
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167
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Fontanili L, Lancilli C, Suzui N, Dendena B, Yin YG, Ferri A, Ishii S, Kawachi N, Lucchini G, Fujimaki S, Sacchi GA, Nocito FF. Kinetic Analysis of Zinc/Cadmium Reciprocal Competitions Suggests a Possible Zn-Insensitive Pathway for Root-to-Shoot Cadmium Translocation in Rice. RICE (NEW YORK, N.Y.) 2016; 9:16. [PMID: 27068924 PMCID: PMC4828370 DOI: 10.1186/s12284-016-0088-3] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 04/02/2016] [Indexed: 05/08/2023]
Abstract
BACKGROUND Among cereals, rice has a genetic propensity to accumulate high levels of cadmium (Cd) in grains. Xylem-mediated root-to-shoot translocation rather than root uptake has been suggested as the main physiological factor accounting for the genotypic variation observed in Cd accumulation in shoots and grains. Several evidence indicate OsHMA2 - a putative zinc (Zn) transporter - as the main candidate protein that could be involved in mediating Cd- and Zn-xylem loading in rice. However, the specific interactions between Zn and Cd in rice often appear anomalous if compared to those observed in other staple crops, suggesting that root-to-shoot Cd translocation process could be more complex than previously thought. In this study we performed a complete set of competition experiments with Zn and Cd in order to analyze their possible interactions and reciprocal effects at the root-to-shoot translocation level. RESULTS The competition analysis revealed the lack of a full reciprocity when considering the effect of Cd on Zn accumulation, and vice versa, since the accumulation of Zn in the shoots was progressively inhibited by Cd increases, whereas that of Cd was only partially impaired by Zn. Such behaviors were probably dependent on Cd-xylem loading mechanisms, as suggested by: i) the analysis of Zn and Cd content in the xylem sap performed in relation to the concentration of the two metals in the mobile fractions of the roots; ii) the analysis of the systemic movement of (107)Cd in short term experiments performed using a positron-emitting tracer imaging system (PETIS). CONCLUSIONS Our results suggest that at least two pathways may mediate root-to-shoot Cd translocation in rice. The former could involve OsHMA2 as Zn(2+)/Cd(2+) xylem loader, whereas the latter appears to involve a Zn-insensitive system that still needs to be identified.
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Affiliation(s)
- Laura Fontanili
- />Dipartimento di Scienze Agrarie e Ambientali - Produzione, Territorio, Agroenergia (DISAA), Università degli Studi di Milano, 20133 Milan, Italy
| | - Clarissa Lancilli
- />Dipartimento di Scienze Agrarie e Ambientali - Produzione, Territorio, Agroenergia (DISAA), Università degli Studi di Milano, 20133 Milan, Italy
- />Istituto di Biologia e Biotecnologia Agraria (IBBA), Consiglio Nazionale delle Ricerche, 20133 Milan, Italy
| | - Nobuo Suzui
- />Department of Radiation-Applied Biology, Takasaki Advanced Radiation Research Institute, Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology (QST), 1233 Watanuki, Takasaki, Gunma 370-1292 Japan
| | - Bianca Dendena
- />Dipartimento di Scienze Agrarie e Ambientali - Produzione, Territorio, Agroenergia (DISAA), Università degli Studi di Milano, 20133 Milan, Italy
| | - Yong-Gen Yin
- />Department of Radiation-Applied Biology, Takasaki Advanced Radiation Research Institute, Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology (QST), 1233 Watanuki, Takasaki, Gunma 370-1292 Japan
| | - Alessandro Ferri
- />Dipartimento di Scienze Agrarie e Ambientali - Produzione, Territorio, Agroenergia (DISAA), Università degli Studi di Milano, 20133 Milan, Italy
| | - Satomi Ishii
- />Department of Radiation-Applied Biology, Takasaki Advanced Radiation Research Institute, Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology (QST), 1233 Watanuki, Takasaki, Gunma 370-1292 Japan
| | - Naoki Kawachi
- />Department of Radiation-Applied Biology, Takasaki Advanced Radiation Research Institute, Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology (QST), 1233 Watanuki, Takasaki, Gunma 370-1292 Japan
| | - Giorgio Lucchini
- />Dipartimento di Scienze Agrarie e Ambientali - Produzione, Territorio, Agroenergia (DISAA), Università degli Studi di Milano, 20133 Milan, Italy
| | - Shu Fujimaki
- />Department of Radiation-Applied Biology, Takasaki Advanced Radiation Research Institute, Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology (QST), 1233 Watanuki, Takasaki, Gunma 370-1292 Japan
| | - Gian Attilio Sacchi
- />Dipartimento di Scienze Agrarie e Ambientali - Produzione, Territorio, Agroenergia (DISAA), Università degli Studi di Milano, 20133 Milan, Italy
| | - Fabio Francesco Nocito
- />Dipartimento di Scienze Agrarie e Ambientali - Produzione, Territorio, Agroenergia (DISAA), Università degli Studi di Milano, 20133 Milan, Italy
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168
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Kühnlenz T, Hofmann C, Uraguchi S, Schmidt H, Schempp S, Weber M, Lahner B, Salt DE, Clemens S. Phytochelatin Synthesis Promotes Leaf Zn Accumulation of Arabidopsis thaliana Plants Grown in Soil with Adequate Zn Supply and is Essential for Survival on Zn-Contaminated Soil. PLANT & CELL PHYSIOLOGY 2016; 57:2342-2352. [PMID: 27694524 DOI: 10.1093/pcp/pcw148] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Accepted: 08/10/2016] [Indexed: 06/06/2023]
Abstract
Phytochelatin (PC) synthesis is essential for the detoxification of non-essential metals such as cadmium (Cd). In vitro experiments with Arabidopsis thaliana seedlings had indicated a contribution to zinc (Zn) tolerance as well. We addressed the physiological role of PC synthesis in Zn homeostasis of plants under more natural conditions. Growth responses, PC accumulation and leaf ionomes of wild-type and AtPCS1 mutant plants cultivated in different soils representing adequate Zn supply, Zn deficiency and Zn excess were analyzed. Growth on Zn-contaminated soil triggers PC synthesis and is strongly impaired in PC-deficient mutants. In fact, the contribution of AtPCS1 to tolerating Zn excess is comparable with that of the major Zn tolerance factor MTP1. For plants supplied with a normal level of Zn, a significant reduction in leaf Zn accumulation of AtPCS1 mutants was detected. In contrast, AtPCS1 mutants grown under Zn-limited conditions showed wild-type levels of Zn accumulation, suggesting the operation of distinct Zn translocation pathways. Contrasting phenotypes of the tested AtPCS1 mutant alleles upon growth in Zn- or Cd-contaminated soil indicated differential activation of PC synthesis by these metals. Experiments with truncated versions identified a part of the AtPCS1 protein required for the activation by Zn but not by Cd.
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Affiliation(s)
- Tanja Kühnlenz
- Department of Plant Physiology, University of Bayreuth, Universitätsstrasse 30, D-95440 Bayreuth, Germany
| | - Christian Hofmann
- Department of Plant Physiology, University of Bayreuth, Universitätsstrasse 30, D-95440 Bayreuth, Germany
| | - Shimpei Uraguchi
- Department of Plant Physiology, University of Bayreuth, Universitätsstrasse 30, D-95440 Bayreuth, Germany
- Present address: Department of Public Health, School of Pharmacy, Kitasato University, Tokyo, Japan
| | - Holger Schmidt
- Department of Plant Physiology, University of Bayreuth, Universitätsstrasse 30, D-95440 Bayreuth, Germany
| | - Stefanie Schempp
- Department of Plant Physiology, University of Bayreuth, Universitätsstrasse 30, D-95440 Bayreuth, Germany
| | - Michael Weber
- Department of Plant Physiology, University of Bayreuth, Universitätsstrasse 30, D-95440 Bayreuth, Germany
| | - Brett Lahner
- Purdue University, Horticulture and Landscape Architecture, West Lafayette, IN, USA
| | - David E Salt
- Purdue University, Horticulture and Landscape Architecture, West Lafayette, IN, USA
- Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen, UK
| | - Stephan Clemens
- Department of Plant Physiology, University of Bayreuth, Universitätsstrasse 30, D-95440 Bayreuth, Germany stephan.clemens@uni-bayreuth
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169
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Barabasz A, Klimecka M, Kendziorek M, Weremczuk A, Ruszczyńska A, Bulska E, Antosiewicz DM. The ratio of Zn to Cd supply as a determinant of metal-homeostasis gene expression in tobacco and its modulation by overexpressing the metal exporter AtHMA4. JOURNAL OF EXPERIMENTAL BOTANY 2016; 67:6201-6214. [PMID: 27811086 PMCID: PMC5100030 DOI: 10.1093/jxb/erw389] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
This study links changes in the tobacco endogenous metal-homeostasis network caused by transgene expression with engineering of novel features. It also provides insight into the concentration-dependent mutual interactions between Zn and Cd, leading to differences in the metal partitioning between wild-type and transgenic plants. In tobacco, expression of the export protein AtHMA4 modified Zn/Cd root/shoot distribution, but the pattern depended on their concentrations in the medium. To address this phenomenon, the expression of genes identified by suppression subtractive hybridization and the Zn/Cd accumulation pattern were examined upon exposure to six variants of low/high Zn and Cd concentrations. Five tobacco metal-homeostasis genes were identified: NtZIP2, NtZIP4, NtIRT1-like, NtNAS, and NtVTL. In the wild type, their expression depended on combinations of low/high Zn and Cd concentrations; co-ordinated responses of NtZIP1, NtZIP2, and NtVTL were shown in medium containing 4 µM Cd, and at 0.5 µM versus 10 µM Zn. In transgenics, qualitative changes detected for NtZIP1, NtZIP4, NtIRT1-like, and NtVTL are considered crucial for modification of Zn/Cd supply-dependent Zn/Cd root/shoot distribution. Notwithstanding, NtVTL was the most responsive gene in wild-type and transgenic plants under all concentrations of Zn and Cd tested; thus it is a candidate gene for the regulation of metal cross-homeostasis processes involved in engineering new metal-related traits.
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Affiliation(s)
- Anna Barabasz
- University of Warsaw, Faculty of Biology, Institute of Experimental Plant Biology and Biotechnology, Department of Plant Anatomy and Cytology, Miecznikowa str 1, 02-096 Warszawa, Poland
| | - Maria Klimecka
- University of Warsaw, Faculty of Biology, Institute of Experimental Plant Biology and Biotechnology, Department of Plant Anatomy and Cytology, Miecznikowa str 1, 02-096 Warszawa, Poland
| | - Maria Kendziorek
- University of Warsaw, Faculty of Biology, Institute of Experimental Plant Biology and Biotechnology, Department of Plant Anatomy and Cytology, Miecznikowa str 1, 02-096 Warszawa, Poland
| | - Aleksandra Weremczuk
- University of Warsaw, Faculty of Biology, Institute of Experimental Plant Biology and Biotechnology, Department of Plant Anatomy and Cytology, Miecznikowa str 1, 02-096 Warszawa, Poland
| | - Anna Ruszczyńska
- University of Warsaw, Faculty of Chemistry, Pasteura str. 1, 02-093 Warszawa, Poland
| | - Ewa Bulska
- University of Warsaw, Faculty of Chemistry, Pasteura str. 1, 02-093 Warszawa, Poland
| | - Danuta Maria Antosiewicz
- University of Warsaw, Faculty of Biology, Institute of Experimental Plant Biology and Biotechnology, Department of Plant Anatomy and Cytology, Miecznikowa str 1, 02-096 Warszawa, Poland
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170
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Li S, Zhou X, Zhao Y, Li H, Liu Y, Zhu L, Guo J, Huang Y, Yang W, Fan Y, Chen J, Chen R. Constitutive expression of the ZmZIP7 in Arabidopsis alters metal homeostasis and increases Fe and Zn content. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2016; 106:1-10. [PMID: 27135812 DOI: 10.1016/j.plaphy.2016.04.044] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 04/23/2016] [Accepted: 04/23/2016] [Indexed: 05/14/2023]
Abstract
Iron (Fe) and zinc (Zn) are important micronutrients for plant growth and development. Zinc-regulated transporters and the iron-regulated transporter-like protein (ZIP) are necessary for the homeostatic regulation of these metal micronutrients. In this study, the physiological function of ZmZIP7 which encodes a ZIP family transporter was characterized. We detected the expression profiles of ZmZIP7 in maize, and found that the accumulation of ZmZIP7 in root, stem, leaf, and seed was relatively higher than tassel and young ear. ZmZIP7 overexpression transgenic Arabidopsis lines were generated and the metal contents in transgenic and wild-type (WT) plants were examined using inductively coupled plasma atomic emission spectroscopy (ICP-OES) and Zinpyr-1 staining. Fe and Zn concentrations were elevated in the roots and shoots of ZmZIP7-overexpressing plants, while only Fe content was elevated in the seeds. We also analyzed the expression profiles of endogenous genes associated with metal homeostasis. Both endogenic Fe-deficiency inducible genes and the genes responsible for Zn and Fe transport and storage were stimulated in ZmZIP7 transgenic plants. In conclusion, ZmZIP7 encodes a functional Zn and Fe transporter, and ectopic overexpression of ZmZIP7 in Arabidopsis stimulate endogenous Fe and Zn uptake mechanisms, thereby facilitating both metal uptake and homeostasis. Our results contribute to improved understanding of ZIP family transporter functions and suggest that ZmZIP7 could be used to enhance Fe levels in grains.
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Affiliation(s)
- Suzhen Li
- Department of Agronomy, Agricultural University of Hebei/Hebei Sub-center of Chinese National Maize Improvement Center, Baoding, 071001, China; Department of Crop Genomics & Genetic Improvement, Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Xiaojin Zhou
- Department of Crop Genomics & Genetic Improvement, Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Yongfeng Zhao
- Department of Agronomy, Agricultural University of Hebei/Hebei Sub-center of Chinese National Maize Improvement Center, Baoding, 071001, China
| | - Hongbo Li
- Department of Agronomy, Agricultural University of Hebei/Hebei Sub-center of Chinese National Maize Improvement Center, Baoding, 071001, China
| | - Yuanfeng Liu
- Department of Agronomy, Agricultural University of Hebei/Hebei Sub-center of Chinese National Maize Improvement Center, Baoding, 071001, China
| | - Liying Zhu
- Department of Agronomy, Agricultural University of Hebei/Hebei Sub-center of Chinese National Maize Improvement Center, Baoding, 071001, China
| | - Jinjie Guo
- Department of Agronomy, Agricultural University of Hebei/Hebei Sub-center of Chinese National Maize Improvement Center, Baoding, 071001, China
| | - Yaqun Huang
- Department of Agronomy, Agricultural University of Hebei/Hebei Sub-center of Chinese National Maize Improvement Center, Baoding, 071001, China
| | - Wenzhu Yang
- Department of Crop Genomics & Genetic Improvement, Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Yunliu Fan
- Department of Crop Genomics & Genetic Improvement, Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Jingtang Chen
- Department of Agronomy, Agricultural University of Hebei/Hebei Sub-center of Chinese National Maize Improvement Center, Baoding, 071001, China.
| | - Rumei Chen
- Department of Crop Genomics & Genetic Improvement, Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
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171
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Muhammad D, Schmittling S, Williams C, Long TA. More than meets the eye: Emergent properties of transcription factors networks in Arabidopsis. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2016; 1860:64-74. [PMID: 27485161 DOI: 10.1016/j.bbagrm.2016.07.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 07/10/2016] [Accepted: 07/27/2016] [Indexed: 11/30/2022]
Abstract
Uncovering and mathematically modeling Transcription Factor Networks (TFNs) are the first steps in engineering plants with traits that are better equipped to respond to changing environments. Although several plant TFNs are well known, the framework for systematically modeling complex characteristics such as switch-like behavior, oscillations, and homeostasis that emerge from them remain elusive. This review highlights literature that provides, in part, experimental and computational techniques for characterizing TFNs. This review also outlines methodologies that have been used to mathematically model the dynamic characteristics of TFNs. We present several examples of TFNs in plants that are involved in developmental and stress response. In several cases, advanced algorithms capture or quantify emergent properties that serve as the basis for robustness and adaptability in plant responses. Increasing the use of mathematical approaches will shed new light on these regulatory properties that control plant growth and development, leading to mathematical models that predict plant behavior. This article is part of a Special Issue entitled: Plant Gene Regulatory Mechanisms and Networks, edited by Dr. Erich Grotewold and Dr. Nathan Springer.
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Affiliation(s)
| | - Selene Schmittling
- Electrical and Computer Engineering, North Carolina State University, Raleigh, NC, USA
| | - Cranos Williams
- Electrical and Computer Engineering, North Carolina State University, Raleigh, NC, USA
| | - Terri A Long
- Plant and Microbial Biology, North Carolina State University, Raleigh, NC, USA.
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172
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González-Guerrero M, Escudero V, Saéz Á, Tejada-Jiménez M. Transition Metal Transport in Plants and Associated Endosymbionts: Arbuscular Mycorrhizal Fungi and Rhizobia. FRONTIERS IN PLANT SCIENCE 2016; 7:1088. [PMID: 27524990 PMCID: PMC4965479 DOI: 10.3389/fpls.2016.01088] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Accepted: 07/11/2016] [Indexed: 05/03/2023]
Abstract
Transition metals such as iron, copper, zinc, or molybdenum are essential nutrients for plants. These elements are involved in almost every biological process, including photosynthesis, tolerance to biotic and abiotic stress, or symbiotic nitrogen fixation. However, plants often grow in soils with limiting metallic oligonutrient bioavailability. Consequently, to ensure the proper metal levels, plants have developed a complex metal uptake and distribution system, that not only involves the plant itself, but also its associated microorganisms. These microorganisms can simply increase metal solubility in soils and making them more accessible to the host plant, as well as induce the plant metal deficiency response, or directly deliver transition elements to cortical cells. Other, instead of providing metals, can act as metal sinks, such as endosymbiotic rhizobia in legume nodules that requires relatively large amounts to carry out nitrogen fixation. In this review, we propose to do an overview of metal transport mechanisms in the plant-microbe system, emphasizing the role of arbuscular mycorrhizal fungi and endosymbiotic rhizobia.
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Affiliation(s)
- Manuel González-Guerrero
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM) – Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA)Madrid, Spain
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173
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A conveniently prepared and hypersensitized small molecular fluorescent probe: Rapidly detecting free zinc ion in HepG2 cells and Arabidopsis. Biosens Bioelectron 2016; 86:393-397. [PMID: 27414244 DOI: 10.1016/j.bios.2016.06.087] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 06/22/2016] [Accepted: 06/29/2016] [Indexed: 01/04/2023]
Abstract
In this paper, we reported a conveniently prepared fluorescent probe for zinc ions detection, which constructed by the condensation reaction between p-(benzothiazolyl)aniline with 4, 4- diethylaminesalicylaldehyde. The sensing ability of the probe toward zinc ions in vitro was tested by a series of UV-Vis and fluorescence spectroscopy studies, which showed that the probe possessed high sensitivity with a detection limit of 5.8nM and a rapid response time of 10s. We also carried out fluorescent bio-imaging of the probe for zinc ions in human liver hepatocellular carcinoma cells (HepG2), which showed that the probe could be utilized to detect the intracellular endogenous zinc ions visually without introducing external zinc sources. Meanwhile, co-staining experiment with organelle selective trackers was performed to illustrate that the probe could locate at endoplasmic reticulum. Finally, we successfully used it as a zinc ion developer in plant tissue, which clearly demonstrated the distribution of zinc ions in the growth stage of plant tissue.
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174
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Lelandais G, Scheiber I, Paz-Yepes J, Lozano JC, Botebol H, Pilátová J, Žárský V, Léger T, Blaiseau PL, Bowler C, Bouget FY, Camadro JM, Sutak R, Lesuisse E. Ostreococcus tauri is a new model green alga for studying iron metabolism in eukaryotic phytoplankton. BMC Genomics 2016; 17:319. [PMID: 27142620 PMCID: PMC4855317 DOI: 10.1186/s12864-016-2666-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 04/26/2016] [Indexed: 11/17/2022] Open
Abstract
Background Low iron bioavailability is a common feature of ocean surface water and therefore micro-algae developed original strategies to optimize iron uptake and metabolism. The marine picoeukaryotic green alga Ostreococcus tauri is a very good model for studying physiological and genetic aspects of the adaptation of the green algal lineage to the marine environment: it has a very compact genome, is easy to culture in laboratory conditions, and can be genetically manipulated by efficient homologous recombination. In this study, we aimed at characterizing the mechanisms of iron assimilation in O. tauri by combining genetics and physiological tools. Specifically, we wanted to identify and functionally characterize groups of genes displaying tightly orchestrated temporal expression patterns following the exposure of cells to iron deprivation and day/night cycles, and to highlight unique features of iron metabolism in O. tauri, as compared to the freshwater model alga Chalamydomonas reinhardtii. Results We used RNA sequencing to investigated the transcriptional responses to iron limitation in O. tauri and found that most of the genes involved in iron uptake and metabolism in O. tauri are regulated by day/night cycles, regardless of iron status. O. tauri lacks the classical components of a reductive iron uptake system, and has no obvious iron regulon. Iron uptake appears to be copper-independent, but is regulated by zinc. Conversely, iron deprivation resulted in the transcriptional activation of numerous genes encoding zinc-containing regulation factors. Iron uptake is likely mediated by a ZIP-family protein (Ot-Irt1) and by a new Fea1-related protein (Ot-Fea1) containing duplicated Fea1 domains. The adaptation of cells to iron limitation involved an iron-sparing response tightly coordinated with diurnal cycles to optimize cell functions and synchronize these functions with the day/night redistribution of iron orchestrated by ferritin, and a stress response based on the induction of thioredoxin-like proteins, of peroxiredoxin and of tesmin-like methallothionein rather than ascorbate. We briefly surveyed the metabolic remodeling resulting from iron deprivation. Conclusions The mechanisms of iron uptake and utilization by O. tauri differ fundamentally from those described in C. reinhardtii. We propose this species as a new model for investigation of iron metabolism in marine microalgae. Electronic supplementary material The online version of this article (doi:10.1186/s12864-016-2666-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Gaëlle Lelandais
- CNRS, Institut Jacques Monod, Université Paris Diderot-Paris 7, F-75013, Paris, France
| | - Ivo Scheiber
- Department of Parasitology, Faculty of Science, Charles University in Prague, 12844, Prague, Czech Republic
| | - Javier Paz-Yepes
- Ecole Normale Supérieure, PSL Research University, Institut de Biologie de l'Ecole Normale Supérieure (IBENS), CNRS UMR 8197, INSERM U1024, 46 rue d'Ulm, F-75005, Paris, France
| | - Jean-Claude Lozano
- Sorbonne Universités, University Pierre et Marie Curie, University of Paris VI, CNRS, Laboratoire d'Océanographie Microbienne, Observatoire Océanologique, F-66650, Banyuls-sur-Mer, France
| | - Hugo Botebol
- Sorbonne Universités, University Pierre et Marie Curie, University of Paris VI, CNRS, Laboratoire d'Océanographie Microbienne, Observatoire Océanologique, F-66650, Banyuls-sur-Mer, France
| | - Jana Pilátová
- Department of Parasitology, Faculty of Science, Charles University in Prague, 12844, Prague, Czech Republic
| | - Vojtěch Žárský
- Department of Parasitology, Faculty of Science, Charles University in Prague, 12844, Prague, Czech Republic
| | - Thibaut Léger
- CNRS, Institut Jacques Monod, Université Paris Diderot-Paris 7, F-75013, Paris, France
| | - Pierre-Louis Blaiseau
- Sorbonne Universités, University Pierre et Marie Curie, University of Paris VI, CNRS, Laboratoire d'Océanographie Microbienne, Observatoire Océanologique, F-66650, Banyuls-sur-Mer, France
| | - Chris Bowler
- Ecole Normale Supérieure, PSL Research University, Institut de Biologie de l'Ecole Normale Supérieure (IBENS), CNRS UMR 8197, INSERM U1024, 46 rue d'Ulm, F-75005, Paris, France
| | - François-Yves Bouget
- Sorbonne Universités, University Pierre et Marie Curie, University of Paris VI, CNRS, Laboratoire d'Océanographie Microbienne, Observatoire Océanologique, F-66650, Banyuls-sur-Mer, France
| | - Jean-Michel Camadro
- CNRS, Institut Jacques Monod, Université Paris Diderot-Paris 7, F-75013, Paris, France
| | - Robert Sutak
- Department of Parasitology, Faculty of Science, Charles University in Prague, 12844, Prague, Czech Republic.
| | - Emmanuel Lesuisse
- CNRS, Institut Jacques Monod, Université Paris Diderot-Paris 7, F-75013, Paris, France.
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175
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Castro-Guerrero NA, Isidra-Arellano MC, Mendoza-Cozatl DG, Valdés-López O. Common Bean: A Legume Model on the Rise for Unraveling Responses and Adaptations to Iron, Zinc, and Phosphate Deficiencies. FRONTIERS IN PLANT SCIENCE 2016; 7:600. [PMID: 27200068 PMCID: PMC4853408 DOI: 10.3389/fpls.2016.00600] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 04/18/2016] [Indexed: 05/19/2023]
Abstract
Common bean (Phaseolus vulgaris) was domesticated ∼8000 years ago in the Americas and today is a staple food worldwide. Besides caloric intake, common bean is also an important source of protein and micronutrients and it is widely appreciated in developing countries for their affordability (compared to animal protein) and its long storage life. As a legume, common bean also has the economic and environmental benefit of associating with nitrogen-fixing bacteria, thus reducing the use of synthetic fertilizers, which is key for sustainable agriculture. Despite significant advances in the plant nutrition field, the mechanisms underlying the adaptation of common bean to low nutrient input remains largely unknown. The recent release of the common bean genome offers, for the first time, the possibility of applying techniques and approaches that have been exclusive to model plants to study the adaptive responses of common bean to challenging environments. In this review, we discuss the hallmarks of common bean domestication and subsequent distribution around the globe. We also discuss recent advances in phosphate, iron, and zinc homeostasis, as these nutrients often limit plant growth, development, and yield. In addition, iron and zinc are major targets of crop biofortification to improve human nutrition. Developing common bean varieties able to thrive under nutrient limiting conditions will have a major impact on human nutrition, particularly in countries where dry beans are the main source of carbohydrates, protein and minerals.
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Affiliation(s)
- Norma A. Castro-Guerrero
- Plant Sciences, Christopher S. Bond Life Sciences Center, University of Missouri, ColumbiaMO, USA
| | - Mariel C. Isidra-Arellano
- Laboratorio de Genómica Funcional de Leguminosas, FES Iztacala, Universidad Nacional Autónoma de MéxicoCiudad de México, México
| | - David G. Mendoza-Cozatl
- Plant Sciences, Christopher S. Bond Life Sciences Center, University of Missouri, ColumbiaMO, USA
| | - Oswaldo Valdés-López
- Laboratorio de Genómica Funcional de Leguminosas, FES Iztacala, Universidad Nacional Autónoma de MéxicoCiudad de México, México
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176
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Quantitative Trait Loci and Inter-Organ Partitioning for Essential Metal and Toxic Analogue Accumulation in Barley. PLoS One 2016; 11:e0153392. [PMID: 27078500 PMCID: PMC4831800 DOI: 10.1371/journal.pone.0153392] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 03/29/2016] [Indexed: 12/25/2022] Open
Abstract
The concentrations of both essential nutrients and chemically similar toxic analogues accumulated in cereal grains have a major impact on the nutritional quality and safety of crops. Naturally occurring genetic diversity can be exploited for the breeding of improved varieties through introgression lines (ILs). In this study, multi-element analysis was conducted on vegetative leaves, senesced flag leaves and mature grains of a set of 54 ILs of the wild ancestral Hordeum vulgare ssp. spontaneum in the cultivated variety Hordeum vulgare ssp. vulgare cv. Scarlett. Plants were cultivated on an anthropogenically heavy metal-contaminated soil collected in an agricultural field, thus allowing simultaneous localization of quantitative trait loci (QTL) for the accumulation of both essential nutrients and toxic trace elements in barley as a model cereal crop. For accumulation of the micronutrients Fe and Zn and the interfering toxin Cd, we identified 25, 16 and 5 QTL, respectively. By examining the gene content of the introgressions, we associated QTL with candidate genes based on homology to known metal homeostasis genes of Arabidopsis and rice. Global comparative analyses suggested the preferential remobilization of Cu and Fe, over Cd, from the flag leaf to developing grains. Our data identifies grain micronutrient filling as a regulated and nutrient-specific process, which operates differently from vegetative micronutrient homoeostasis. In summary, this study provides novel QTL for micronutrient accumulation in the presence of toxic analogues and supports a higher degree of metal specificity of trace element partitioning during grain filling in barley than previously reported for other cereals.
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177
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Oh YJ, Kim H, Seo SH, Hwang BG, Chang YS, Lee J, Lee DW, Sohn EJ, Lee SJ, Lee Y, Hwang I. Cytochrome b5 Reductase 1 Triggers Serial Reactions that Lead to Iron Uptake in Plants. MOLECULAR PLANT 2016; 9:501-513. [PMID: 26712506 DOI: 10.1016/j.molp.2015.12.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Revised: 11/23/2015] [Accepted: 12/07/2015] [Indexed: 06/05/2023]
Abstract
Rhizosphere acidification is essential for iron (Fe) uptake into plant roots. Plasma membrane (PM) H(+)-ATPases play key roles in rhizosphere acidification. However, it is not fully understood how PM H(+)-ATPase activity is regulated to enhance root Fe uptake under Fe-deficient conditions. Here, we present evidence that cytochrome b5 reductase 1 (CBR1) increases the levels of unsaturated fatty acids, which stimulate PM H(+)-ATPase activity and thus lead to rhizosphere acidification. CBR1-overexpressing (CBR1-OX) Arabidopsis thaliana plants had higher levels of unsaturated fatty acids (18:2 and 18:3), higher PM H(+)-ATPase activity, and lower rhizosphere pH than wild-type plants. By contrast, cbr1 loss-of-function mutant plants showed lower levels of unsaturated fatty acids and lower PM H(+)-ATPase activity but higher rhizosphere pH. Reduced PM H(+)-ATPase activity in cbr1 could be restored in vitro by addition of unsaturated fatty acids. Transcript levels of CBR1, fatty acids desaturase2 (FAD2), and fatty acids desaturase3 (FAD3) were increased under Fe-deficient conditions. We propose that CBR1 has a crucial role in increasing the levels of unsaturated fatty acids, which activate the PM H(+)-ATPase and thus reduce rhizosphere pH. This reaction cascade ultimately promotes root Fe uptake.
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Affiliation(s)
- Young Jun Oh
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Hanul Kim
- Department Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Sung Hee Seo
- Division of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Bae Geun Hwang
- Division of Mechanical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Yoon Seok Chang
- Division of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Junho Lee
- Department Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Dong Wook Lee
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Eun Ju Sohn
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Sang Joon Lee
- Division of Mechanical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Youngsook Lee
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang 790-784, Korea; Department Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Inhwan Hwang
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang 790-784, Korea; Department Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Korea.
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178
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Azevedo H, Azinheiro SG, Muñoz-Mérida A, Castro PH, Huettel B, Aarts MG, Assunção AG. Transcriptomic profiling of Arabidopsis gene expression in response to varying micronutrient zinc supply. GENOMICS DATA 2016; 7:256-8. [PMID: 26981422 PMCID: PMC4778672 DOI: 10.1016/j.gdata.2016.01.021] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Accepted: 01/30/2016] [Indexed: 12/31/2022]
Abstract
Deficiency of the micronutrient zinc is a widespread condition in agricultural soils, causing a negative impact on crop quality and yield. Nevertheless, there is an insufficient knowledge on the regulatory and molecular mechanisms underlying the plant response to inadequate zinc nutrition [1]. This information should contribute to the development of plant-based solutions with improved nutrient-use-efficiency traits in crops. Previously, the transcription factors bZIP19 and bZIP23 were identified as essential regulators of the response to zinc deficiency in Arabidopsis thaliana [2]. A microarray experiment comparing gene expression between roots of wild-type and the mutant bzip19 bzip23, exposed to zinc deficiency, led to the identification of differentially expressed genes related with zinc homeostasis, namely its transport and plant internal translocation [2]. Here, we provide the detailed methodology, bioinformatics analysis and quality controls related to the microarray gene expression profiling published by Assunção and co-workers [2]. Most significantly, the present dataset comprises new experimental variables, including analysis of shoot tissue, and zinc sufficiency and excess supply. Thus, it expands from 8 to 42 microarrays hybridizations, which have been deposited at the Gene Expression Omnibus (GEO) under the accession number GSE77286. Overall, it provides a resource for research on the molecular basis and regulatory events of the plant response to zinc supply, emphasizing the importance of Arabidopsis bZIP19 and bZIP23 transcription factors.
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Affiliation(s)
- Herlânder Azevedo
- CIBIO-InBIO, Research Network in Biodiversity and Evolutionary Biology, Universidade do Porto, Campus Agrário de Vairão, 4485-661 Vairão, Portugal
| | - Sarah Gaspar Azinheiro
- CIBIO-InBIO, Research Network in Biodiversity and Evolutionary Biology, Universidade do Porto, Campus Agrário de Vairão, 4485-661 Vairão, Portugal
| | - Antonio Muñoz-Mérida
- CIBIO-InBIO, Research Network in Biodiversity and Evolutionary Biology, Universidade do Porto, Campus Agrário de Vairão, 4485-661 Vairão, Portugal
| | - Pedro Humberto Castro
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Denmark
| | - Bruno Huettel
- Max Planck Institute for Plant Breeding ADIS/DNA Core Facility, D-50829 Cologne, Germany
| | - Mark G.M. Aarts
- Laboratory of Genetics, Wageningen University, 6708 PB Wageningen, The Netherlands
| | - Ana G.L. Assunção
- CIBIO-InBIO, Research Network in Biodiversity and Evolutionary Biology, Universidade do Porto, Campus Agrário de Vairão, 4485-661 Vairão, Portugal
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Denmark
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179
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Lin YF, Hassan Z, Talukdar S, Schat H, Aarts MGM. Expression of the ZNT1 Zinc Transporter from the Metal Hyperaccumulator Noccaea caerulescens Confers Enhanced Zinc and Cadmium Tolerance and Accumulation to Arabidopsis thaliana. PLoS One 2016; 11:e0149750. [PMID: 26930473 PMCID: PMC4773103 DOI: 10.1371/journal.pone.0149750] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 02/04/2016] [Indexed: 11/18/2022] Open
Abstract
Prompt regulation of transition metal transporters is crucial for plant zinc homeostasis. NcZNT1 is one of such transporters, found in the metal hyperaccumulator Brassicaceae species Noccaea caerulescens. It is orthologous to AtZIP4 from Arabidopsis thaliana, an important actor in Zn homeostasis. We examined if the NcZNT1 function contributes to the metal hyperaccumulation of N. caerulescens. NcZNT1 was found to be a plasma-membrane located metal transporter. Constitutive overexpression of NcZNT1 in A. thaliana conferred enhanced tolerance to exposure to excess Zn and Cd supply, as well as increased accumulation of Zn and Cd and induction of the Fe deficiency response, when compared to non-transformed wild-type plants. Promoters of both genes were induced by Zn deficiency in roots and shoots of A. thaliana. In A. thaliana, the AtZIP4 and NcZNT1 promoters were mainly active in cortex, endodermis and pericycle cells under Zn deficient conditions. In N. caerulescens, the promoters were active in the same tissues, though the activity of the NcZNT1 promoter was higher and not limited to Zn deficient conditions. Common cis elements were identified in both promoters by 5' deletion analysis. These correspond to the previously determined Zinc Deficiency Responsive Elements found in A. thaliana to interact with two redundantly acting transcription factors, bZIP19 and bZIP23, controlling the Zn deficiency response. In conclusion, these results suggest that NcZNT1 is an important factor in contributing to Zn and Cd hyperaccumulation in N. caerulescens. Differences in cis- and trans-regulators are likely to account for the differences in expression between A. thaliana and N. caerulescens. The high, constitutive NcZNT1 expression in the stele of N. caerulescens roots implicates its involvement in long distance root-to-shoot metal transport by maintaining a Zn/Cd influx into cells responsible for xylem loading.
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Affiliation(s)
- Ya-Fen Lin
- Laboratory of Genetics, Wageningen University and Research Centre, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Zeshan Hassan
- Laboratory of Genetics, Wageningen University and Research Centre, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Sangita Talukdar
- Laboratory of Genetics, Wageningen University and Research Centre, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Henk Schat
- Institute of Molecular and Cellular Biology, Free University of Amsterdam, De Boelelaan 1085, NL-1081 HV, Amsterdam, The Netherlands
| | - Mark G. M. Aarts
- Laboratory of Genetics, Wageningen University and Research Centre, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
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180
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Gupta N, Ram H, Kumar B. Mechanism of Zinc absorption in plants: uptake, transport, translocation and accumulation. REVIEWS IN ENVIRONMENTAL SCIENCE AND BIO/TECHNOLOGY 2016. [PMID: 0 DOI: 10.1007/s11157-016-9390-1] [Citation(s) in RCA: 137] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
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181
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Ariani A, Francini A, Andreucci A, Sebastiani L. Over-expression of AQUA1 in Populus alba Villafranca clone increases relative growth rate and water use efficiency, under Zn excess condition. PLANT CELL REPORTS 2016; 35:289-301. [PMID: 26518428 DOI: 10.1007/s00299-015-1883-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Revised: 09/01/2015] [Accepted: 10/12/2015] [Indexed: 05/04/2023]
Abstract
Transgenic Populus alba over-expressing a TIP aquaporin ( aqua1) showed a higher growth rate under Zn excess, suggesting that aqua1 could be involved in water homeostasis, rather than in Zn homeostasis. Populus is the internationally accepted model for physiological and developmental studies of tree traits under stress. In plants, aquaporins facilitate and regulate the diffusion of water, however, few poplar aquaporins have been characterized to date. In this study, we reported for the first time an in vivo characterization of Populus alba clone Villafranca transgenic plants over-expressing a TIP aquaporin (aqua1) of P. x euramericana clone I-214. An AQUA1:GFP chimeric construct, over-expressed in P. alba Villafranca clones, shows a cytoplasmic localization in roots, and it localizes in guard cells in leaves. When over-expressed in transgenic plants, aqua1 confers a higher growth rate compared to wild-type (wt) plants, without affecting chlorophyll accumulation, relative water content (RWC), and fluorescence performances, but increasing the intrinsic Transpiration Efficiency. In response to Zn (1 mM), transgenic lines did not show a significant increase in Zn accumulation as compared to wt plants, even though the over-expression of this gene confers higher tolerance in root tissues. These results suggest that, in poplar plants, this gene could be principally involved in regulation of water homeostasis and biomass production, rather than in Zn homeostasis.
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Affiliation(s)
- Andrea Ariani
- BioLabs, Institute of Life Sciences, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà, 33, 56127, Pisa, Italy.
- Department of Plant Sciences/MS1, University of California, 1 Shields Avenue, Davis, CA, 95616-8780, USA.
| | - Alessandra Francini
- BioLabs, Institute of Life Sciences, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà, 33, 56127, Pisa, Italy.
| | - Andrea Andreucci
- Department of Biology, University of Pisa, V. L. Ghini 13, 56126, Pisa, Italy.
| | - Luca Sebastiani
- BioLabs, Institute of Life Sciences, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà, 33, 56127, Pisa, Italy.
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182
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Moreno-Moyano LT, Bonneau JP, Sánchez-Palacios JT, Tohme J, Johnson AAT. Association of Increased Grain Iron and Zinc Concentrations with Agro-morphological Traits of Biofortified Rice. FRONTIERS IN PLANT SCIENCE 2016; 7:1463. [PMID: 27733860 PMCID: PMC5039209 DOI: 10.3389/fpls.2016.01463] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 09/14/2016] [Indexed: 05/07/2023]
Abstract
Biofortification of rice (Oryza sativa L.) with micronutrients is widely recognized as a sustainable strategy to alleviate human iron (Fe) and zinc (Zn) deficiencies in developing countries where rice is the staple food. Constitutive overexpression of the rice nicotianamine synthase (OsNAS) genes has been successfully implemented to increase Fe and Zn concentrations in unpolished and polished rice grain. Intensive research is now needed to couple this high-micronutrient trait with high grain yields. We investigated associations of increased grain Fe and Zn concentrations with agro-morphological traits of backcross twice second filial (BC2F2) transgenic progeny carrying OsNAS1 or OsNAS2 overexpression constructs under indica/japonica and japonica/japonica genetic backgrounds. Thirteen agro-morphological traits were evaluated in BC2F2 transgenic progeny grown under hydroponic conditions. Concentrations of eight mineral nutrients (Fe, Zn, copper, manganese, calcium, magnesium, potassium, and phosphorus) in roots, stems/sheaths, non-flag leaves, flag leaves, panicles, and grain were also determined. A distance-based linear model (DistLM) was utilized to extract plant tissue nutrient predictors accounting for the largest variation in agro-morphological traits differing between transgenic and non-transgenic progeny. Overall, the BC2F2 transgenic progeny contained up to 148% higher Fe and 336% higher Zn concentrations in unpolished grain compared to non-transgenic progeny. However, unpolished grain concentrations surpassing 23 μg Fe g-1 and 40 μg Zn g-1 in BC2F2indica/japonica progeny, and 36 μg Fe g-1 and 56 μg Zn g1 in BC2F2japonica/japonica progeny, were associated with significant reductions in grain yield. DistLM analyses identified grain-Zn and panicle-magnesium as the primary nutrient predictors associated with grain yield reductions in the indica/japonica and japonica/japonica background, respectively. We subsequently produced polished grain from high-yield BC2F2 transgenic progeny carrying either the OsNAS1 or OsNAS2 overexpression constructs. The OsNAS2 overexpressing progeny had higher percentages of Fe and Zn in polished rice grain compared to the OsNAS1 overexpressing progeny. Results from this study demonstrate that genetic background has a major effect on the development of Fe and Zn biofortified rice. Moreover, our study shows that high-yielding rice lines with Fe and Zn biofortified polished grain can be developed by OsNAS2 overexpression and monitoring for Zn overaccumulation in the grain.
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Affiliation(s)
- Laura T. Moreno-Moyano
- School of BioSciences, The University of Melbourne, MelbourneVIC, Australia
- *Correspondence: Laura T. Moreno-Moyano,
| | - Julien P. Bonneau
- School of BioSciences, The University of Melbourne, MelbourneVIC, Australia
| | | | - Joseph Tohme
- International Center for Tropical AgricultureCali, Colombia
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183
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Abstract
Metal toxicity in plants is still a global problem for the environment, agriculture and ultimately human health.
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Affiliation(s)
- Hendrik Küpper
- Biology Center of the Czech Academy of Sciences
- Institute of Plant Molecular Biology
- Department of Plant Biophysics & Biochemistry
- 370 05 České Budějovice, Czech Republic
- University of South Bohemia
| | - Elisa Andresen
- Biology Center of the Czech Academy of Sciences
- Institute of Plant Molecular Biology
- Department of Plant Biophysics & Biochemistry
- 370 05 České Budějovice, Czech Republic
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184
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Deciphering Mineral Homeostasis in Barley Seed Transfer Cells at Transcriptional Level. PLoS One 2015; 10:e0141398. [PMID: 26536247 PMCID: PMC4633283 DOI: 10.1371/journal.pone.0141398] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 10/06/2015] [Indexed: 12/13/2022] Open
Abstract
In addition to the micronutrient inadequacy of staple crops for optimal human nutrition, a global downtrend in crop-quality has emerged from intensive breeding for yield. This trend will be aggravated by elevated levels of the greenhouse gas carbon dioxide. Therefore, crop biofortification is inevitable to ensure a sustainable supply of minerals to the large part of human population who is dietary dependent on staple crops. This requires a thorough understanding of plant-mineral interactions due to the complexity of mineral homeostasis. Employing RNA sequencing, we here communicate transfer cell specific effects of excess iron and zinc during grain filling in our model crop plant barley. Responding to alterations in mineral contents, we found a long range of different genes and transcripts. Among them, it is worth to highlight the auxin and ethylene signaling factors Arfs, Abcbs, Cand1, Hps4, Hac1, Ecr1, and Ctr1, diurnal fluctuation components Sdg2, Imb1, Lip1, and PhyC, retroelements, sulfur homeostasis components Amp1, Hmt3, Eil3, and Vip1, mineral trafficking components Med16, Cnnm4, Aha2, Clpc1, and Pcbps, and vacuole organization factors Ymr155W, RabG3F, Vps4, and Cbl3. Our analysis introduces new interactors and signifies a broad spectrum of regulatory levels from chromatin remodeling to intracellular protein sorting mechanisms active in the plant mineral homeostasis. The results highlight the importance of storage proteins in metal ion toxicity-resistance and chelation. Interestingly, the protein sorting and recycling factors Exoc7, Cdc1, Sec23A, and Rab11A contributed to the response as well as the polar distributors of metal-transporters ensuring the directional flow of minerals. Alternative isoform switching was found important for plant adaptation and occurred among transcripts coding for identical proteins as well as transcripts coding for protein isoforms. We also identified differences in the alternative-isoform preference between the treatments, indicating metal-affinity shifts among isoforms of metal transporters. Most important, we found the zinc treatment to impair both photosynthesis and respiration. A wide range of transcriptional changes including stress-related genes and negative feedback loops emphasize the importance to withhold mineral contents below certain cellular levels which otherwise might lead to agronomical impeding side-effects. By illustrating new mechanisms, genes, and transcripts, this report provides a solid platform towards understanding the complex network of plant mineral homeostasis.
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185
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Inaba S, Kurata R, Kobayashi M, Yamagishi Y, Mori I, Ogata Y, Fukao Y. Identification of putative target genes of bZIP19, a transcription factor essential for Arabidopsis adaptation to Zn deficiency in roots. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2015; 84:323-34. [PMID: 26306426 DOI: 10.1111/tpj.12996] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Revised: 02/16/2015] [Accepted: 08/18/2015] [Indexed: 05/22/2023]
Abstract
Zinc (Zn) depletion adversely affects plant growth. To avoid lethal depletion of cellular Zn, plants have evolved mechanisms to adjust the expression of genes associated with Zn homeostasis, the details of which are poorly understood. In the present study, we isolated an Arabidopsis thaliana T-DNA insertion mutant that exhibited hypersensitivity to Zn depletion. By monitoring root development under Zn-deficient conditions, we isolated a single mutant lacking the basic-region leucine-zipper transcription factor gene bZIP19. To identify proteins whose expression is affected by bZIP19, an iTRAQ-based quantitative proteomics analysis was performed using microsomal proteins from wild-type and the bzip19 mutant A. thaliana roots grown on Basal and Zn-deficient media. Of the 797 proteins identified, expression of two members of the Zrt- and Irt-related protein family, ZIP3 and ZIP9, and three defensin-like family proteins was markedly induced in wild-type but not in the bzip19 mutant under Zn-deficient conditions. Furthermore, selected reaction monitoring and quantitative real-time PCR revealed that ZIP9 expression is mediated by bZIP19 and may be partly supported by bZIP23, a homolog of bZIP19. Mutant analysis revealed that ZIP9 is involved in uptake of Zn by the roots, and the mutant lacking ZIP9 was significantly more sensitive to Zn depletion than the wild-type. These results demonstrate that bZIP19 mainly contributes to expression of genes, such as ZIP9, under Zn-deficient conditions.
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Affiliation(s)
- Shoko Inaba
- Department of Bioinformatics, Ritsumeikan University, Kusatsu, Shiga, 525-8577, Japan
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Nara, 630-0192, Japan
| | - Rie Kurata
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Nara, 630-0192, Japan
| | - Mami Kobayashi
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Nara, 630-0192, Japan
| | - Yoko Yamagishi
- Thermo Fisher Scientific, Yokohama, Kanagawa, 221-0022, Japan
| | - Izumi Mori
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Okayama, 710-0046, Japan
| | - Yoshiyuki Ogata
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
| | - Yoichiro Fukao
- Department of Bioinformatics, Ritsumeikan University, Kusatsu, Shiga, 525-8577, Japan
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Nara, 630-0192, Japan
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186
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Mathpal B, Srivastava PC, Shankhdhar D, Shankhdhar SC. Improving key enzyme activities and quality of rice under various methods of zinc application. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2015; 21:567-72. [PMID: 26597356 PMCID: PMC4646876 DOI: 10.1007/s12298-015-0321-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Revised: 07/19/2015] [Accepted: 09/07/2015] [Indexed: 05/06/2023]
Abstract
Zinc (Zn) is an important micronutrient for the physiology of plants. It is poorly available to the plants in soil solution. A pot experiment was conducted to evaluate effectiveness of various Zn application methods on key enzyme activities and protein content of two contrasting rice genotypes viz., PD16 (Zn efficient) and NDR359 (Zn inefficient). The treatments were, control (0 mg Zn kg(-1) soil), soil application (5 mg Zn kg(-1) soil), foliar application (0.5 % ZnSO4 + 0.25 % lime at 30, 60 and 90 days after transplanting), soil (5 mg Zn kg(-1) soil) + foliar application of 0.5 % ZnSO4 + 0.25 % lime at 30, 60 and 90 days after transplanting. Among all the methods tested soil+foliar application of Zn fertilizers was found most effective in increasing superoxide dismutase (SOD) and carbonic anhydrase (CA) activities as well as chlorophyll and protein content in both the rice varieties. NDR359, showed higher enzyme activities and more chlorophyll content in leaves than PD16, when Zn was applied either through foliar spray alone or in soil along with foliar application. Regarding the protein content in grains, PD16 showed higher protein content than NDR359, thus showed better translocation of Zn from leaves to grains.
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Affiliation(s)
- Bhupendra Mathpal
- />Department of Plant Physiology, College of Basic Sciences and Humanities, G. B. Pant University of Agriculture and Technology, Pantnagar, 263145 Uttarakhand India
| | - Prakash Chandra Srivastava
- />Department of Soil Science, College of Agriculture, G. B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand 263145 India
| | - Deepti Shankhdhar
- />Department of Plant Physiology, College of Basic Sciences and Humanities, G. B. Pant University of Agriculture and Technology, Pantnagar, 263145 Uttarakhand India
| | - Shailesh Chandra Shankhdhar
- />Department of Plant Physiology, College of Basic Sciences and Humanities, G. B. Pant University of Agriculture and Technology, Pantnagar, 263145 Uttarakhand India
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187
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Zschiesche W, Barth O, Daniel K, Böhme S, Rausche J, Humbeck K. The zinc-binding nuclear protein HIPP3 acts as an upstream regulator of the salicylate-dependent plant immunity pathway and of flowering time in Arabidopsis thaliana. THE NEW PHYTOLOGIST 2015; 207:1084-1096. [PMID: 25913773 DOI: 10.1111/nph.13419] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Accepted: 03/17/2015] [Indexed: 06/04/2023]
Abstract
Biotic and abiotic stress responses of plants are linked to developmental programs. Proteins involved in different signaling pathways are the molecular basis of this concerted interplay. In our study, we show that Arabidopsis thaliana HEAVY METAL-ASSOCIATED ISOPRENYLATED PLANT PROTEIN3 (HIPP3; At5g60800) acts as an upstream regulator of stress- and development-related regulatory networks. Localization, metal-binding and stress-responsive gene expression of HIPP3 were analyzed via microscopy, protein and inductively coupled plasma (ICP)-MS analyses and quantitative real-time PCR. In addition, transcriptome and phenotype analyses of plants overexpressing HIPP3 were used to unravel its function. Our data show that HIPP3 is a nuclear, zinc-binding protein. It is repressed during drought stress and abscisic acid (ABA) treatment and, similar to other pathogen-related genes, is induced after infection with Pseudomonas syringae pv. tomato. HIPP3 overexpression affects the regulation of > 400 genes. Strikingly, most of these genes are involved in pathogen response, especially in the salicylate pathway. In addition, many genes of abiotic stress responses and seed and flower development are affected by HIPP3 overexpression. Plants overexpressing HIPP3 show delayed flowering. We conclude that HIPP3 acts via its bound zinc as an upstream regulator of the salicylate-dependent pathway of pathogen response and is also involved in abiotic stress responses and seed and flower development.
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Affiliation(s)
- Wiebke Zschiesche
- Institute of Biology, Martin-Luther-University Halle-Wittenberg, Weinbergweg 10, 06120, Halle, Germany
| | - Olaf Barth
- Institute of Biology, Martin-Luther-University Halle-Wittenberg, Weinbergweg 10, 06120, Halle, Germany
| | - Katharina Daniel
- Institute of Biology, Martin-Luther-University Halle-Wittenberg, Weinbergweg 10, 06120, Halle, Germany
| | - Sandra Böhme
- Institute of Biology, Martin-Luther-University Halle-Wittenberg, Weinbergweg 10, 06120, Halle, Germany
| | - Juliane Rausche
- Institute of Biology, Martin-Luther-University Halle-Wittenberg, Weinbergweg 10, 06120, Halle, Germany
| | - Klaus Humbeck
- Institute of Biology, Martin-Luther-University Halle-Wittenberg, Weinbergweg 10, 06120, Halle, Germany
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188
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Stewart J, Hansen T, McLean JE, McManus P, Das S, Britt DW, Anderson AJ, Dimkpa CO. Salts affect the interaction of ZnO or CuO nanoparticles with wheat. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2015; 34:2116-2125. [PMID: 25917258 DOI: 10.1002/etc.3037] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Revised: 03/26/2015] [Accepted: 04/22/2015] [Indexed: 06/04/2023]
Abstract
Exposure to nanoparticles (NPs) that release metals with potential phytotoxicity could pose problems in agriculture. The authors of the present study used growth in a model growth matrix, sand, to examine the influence of 5 mmol/kg of Na, K, or Ca (added as Cl salts) and root exudates on transformation and changes to the bioactivity of copper(II) oxide (CuO) and zinc oxide (ZnO) NPs on wheat. These salt levels are found in saline agricultural soils. After 14 d of seedling growth, particles with crystallinity typical of CuO or ZnO remained in the aqueous fraction from the sand; particles had negative surface charges that differed with NP type and salt, but salt did not alter particle agglomeration. Reduction in shoot and root elongation and lateral root induction by ZnO NPs were mitigated by all salts. However, whereas Na and K promoted Zn loading into shoots, Ca reduced loading, suggesting that competition with Zn ions for uptake occurred. With CuO NPs, plant growth and loading was modified equally by all salts, consistent with major interaction with the plant with CuO rather than Cu ions. Thus, for both NPs, loading into plant tissues was not solely dependent on ion solubility. These findings indicated that salts in agricultural soils could modify the phytotoxicity of NPs.
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Affiliation(s)
- Jacob Stewart
- Department of Biology, Utah State University, Logan, Utah, USA
| | - Trevor Hansen
- Department of Biology, Utah State University, Logan, Utah, USA
| | - Joan E McLean
- Utah Water Research Laboratory, Utah State University, Logan, Utah, USA
| | - Paul McManus
- Utah Water Research Laboratory, Utah State University, Logan, Utah, USA
| | - Siddhartha Das
- Chemistry and Biochemistry Department, Utah State University, Logan, Utah, USA
| | - David W Britt
- Biological Engineering Department, Utah State University, Logan, Utah, USA
| | - Anne J Anderson
- Department of Biology, Utah State University, Logan, Utah, USA
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189
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Li S, Zhou X, Li H, Liu Y, Zhu L, Guo J, Liu X, Fan Y, Chen J, Chen R. Overexpression of ZmIRT1 and ZmZIP3 Enhances Iron and Zinc Accumulation in Transgenic Arabidopsis. PLoS One 2015; 10:e0136647. [PMID: 26317616 PMCID: PMC4552944 DOI: 10.1371/journal.pone.0136647] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 08/06/2015] [Indexed: 11/19/2022] Open
Abstract
Iron and zinc are important micronutrients for both the growth and nutrient availability of crop plants, and their absorption is tightly controlled by a metal uptake system. Zinc-regulated transporters, iron-regulated transporter-like proteins (ZIP), is considered an essential metal transporter for the acquisition of Fe and Zn in graminaceous plants. Several ZIPs have been identified in maize, although their physiological function remains unclear. In this report, ZmIRT1 was shown to be specifically expressed in silk and embryo, whereas ZmZIP3 was a leaf-specific gene. Both ZmIRT1 and ZmZIP3 were shown to be localized to the plasma membrane and endoplasmic reticulum. In addition, transgenic Arabidopsis plants overexpressing ZmIRT1 or ZmZIP3 were generated, and the metal contents in various tissues of transgenic and wild-type plants were examined based on ICP-OES and Zinpyr-1 staining. The Fe and Zn concentration increased in roots and seeds of ZmIRT1-overexpressing plants, while the Fe content in shoots decreased. Overexpressing ZmZIP3 enhanced Zn accumulation in the roots of transgenic plants, while that in shoots was repressed. In addition, the transgenic plants showed altered tolerance to various Fe and Zn conditions compared with wild-type plants. Furthermore, the genes associated with metal uptake were stimulated in ZmIRT1 transgenic plants, while those involved in intra- and inter- cellular translocation were suppressed. In conclusion, ZmIRT1 and ZmZIP3 are functional metal transporters with different ion selectivities. Ectopic overexpression of ZmIRT1 may stimulate endogenous Fe uptake mechanisms, which may facilitate metal uptake and homeostasis. Our results increase our understanding of the functions of ZIP family transporters in maize.
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Affiliation(s)
- Suzhen Li
- Department of Agronomy, Agricultural University of Hebei/Hebei Sub-center of Chinese National Maize Improvement Center, Baoding, China
- Department of Crop Genomics & Genetic Improvement, Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Xiaojin Zhou
- Department of Crop Genomics & Genetic Improvement, Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Hongbo Li
- Department of Agronomy, Agricultural University of Hebei/Hebei Sub-center of Chinese National Maize Improvement Center, Baoding, China
| | - Yuanfeng Liu
- Department of Agronomy, Agricultural University of Hebei/Hebei Sub-center of Chinese National Maize Improvement Center, Baoding, China
| | - Liying Zhu
- Department of Agronomy, Agricultural University of Hebei/Hebei Sub-center of Chinese National Maize Improvement Center, Baoding, China
| | - Jinjie Guo
- Department of Agronomy, Agricultural University of Hebei/Hebei Sub-center of Chinese National Maize Improvement Center, Baoding, China
| | - Xiaoqing Liu
- Department of Crop Genomics & Genetic Improvement, Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Yunliu Fan
- Department of Crop Genomics & Genetic Improvement, Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Jingtang Chen
- Department of Agronomy, Agricultural University of Hebei/Hebei Sub-center of Chinese National Maize Improvement Center, Baoding, China
- * E-mail: (JTC); (RMC)
| | - Rumei Chen
- Department of Crop Genomics & Genetic Improvement, Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
- * E-mail: (JTC); (RMC)
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190
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Ricachenevsky FK, Menguer PK, Sperotto RA, Fett JP. Got to hide your Zn away: Molecular control of Zn accumulation and biotechnological applications. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2015; 236:1-17. [PMID: 26025516 DOI: 10.1016/j.plantsci.2015.03.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 03/12/2015] [Accepted: 03/13/2015] [Indexed: 05/20/2023]
Abstract
Zinc (Zn) is an essential micronutrient for all organisms, with key catalytic and structural functions. Zn deficiency in plants, common in alkaline soils, results in growth arrest and sterility. On the other hand, Zn can become toxic at elevated concentrations. Several studies revealed molecules involved with metal acquisition in roots, distribution within the plant and translocation to seeds. Transmembrane Zn transport proteins and Zn chelators are involved in avoiding its toxic effects. Plant species with the capacity to hyperaccumulate and hypertolerate Zn have been characterized. Plants that accumulate and tolerate high amounts of Zn and produce abundant biomass may be useful for phytoremediation, allowing cleaning of metal-contaminated soils. The study of Zn hyperaccumulators may provide indications of genes and processes useful for biofortification, for developing crops with high amounts of nutrients in edible tissues. Future research needs to focus on functional characterization of Zn transporters in planta, elucidation of Zn uptake and sensing mechanisms, and on understanding the cross-talk between Zn homeostasis and other physiological processes. For this, new research should use multidisciplinary approaches, combining traditional and emerging techniques, such as genome-encoded metal sensors and multi-element imaging, quantification and speciation using synchrotron-based methods.
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Affiliation(s)
- Felipe Klein Ricachenevsky
- Centro de Biotecnologia & Programa de Pós-Graduação em Botânica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
| | - Paloma Koprovski Menguer
- Centro de Biotecnologia & Programa de Pós-Graduação em Botânica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil; John Innes Centre, Norwich, United Kingdom.
| | - Raul Antonio Sperotto
- Centro de Ciências Biológicas e da Saúde & Programa de Pós-Graduação em Biotecnologia, Centro Universitário UNIVATES, Lajeado, RS, Brazil.
| | - Janette Palma Fett
- Centro de Biotecnologia & Programa de Pós-Graduação em Botânica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
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191
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Bokor B, Bokorová S, Ondoš S, Švubová R, Lukačová Z, Hýblová M, Szemes T, Lux A. Ionome and expression level of Si transporter genes (Lsi1, Lsi2, and Lsi6) affected by Zn and Si interaction in maize. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:6800-11. [PMID: 25430013 DOI: 10.1007/s11356-014-3876-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 11/16/2014] [Indexed: 05/21/2023]
Abstract
Zinc (Zn) is an essential microelement involved in various plant physiological processes. However, in excess, Zn becomes toxic and represents serious problem for plants resulting in Zn toxicity symptoms and decreasing biomass production. The effect of high Zn and its combination with silicon (Si) on ionome and expression level of ZmLsi genes was investigated in maize (Zea mays, L; hybrid Novania). Plants were cultivated hydroponically in different treatments: control (C), Zn (800 μM ZnSO4 · 7H2O), Si5 (5 mM of sodium silicate solution), and Si5 + Zn (combination of Zn and Si treatments). Growth of plants cultivated for 10 days was significantly inhibited in the presence of high Zn concentration and also by Zn and Si interaction in plants. Based on principal component analysis (PCA) and mineral element concentration in tissues, root ionome was significantly altered in both Zn and Si5 + Zn treatments in comparison to control. Mineral elements Mn, Fe, Ca, P, Mg, Ni, Co, and K significantly decreased, and Se increased in Zn and Si5 + Zn treatments. Shoot ionome was less affected than root ionome. Concentration of shoot Cu, Mn, and P decreased, and Mo increased in Zn and Si5 + Zn treatments. The PCA also revealed that the responsibility for ionome changes is mainly due to Zn exposure and also, but less, by Si application to Zn stressed plants. Expression level of Lsi1 and Lsi2 genes for the Si influx and efflux transporters was downregulated in roots after Si supply and even more downregulated by Zinc alone and also by Zn and Si interaction. Expression level of shoot Lsi6 gene was differently regulated in the first and second leaf. These results indicate negative effect of high Zn alone and also in interaction with Si on Lsi gene expression level and together with ionomic data, it was shown that homeostatic network of mineral elements was disrupted and caused negative alterations in mineral nutrition of young maize plants.
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Affiliation(s)
- Boris Bokor
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina B2, 84215, Bratislava, Slovakia,
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192
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Cornu JY, Deinlein U, Höreth S, Braun M, Schmidt H, Weber M, Persson DP, Husted S, Schjoerring JK, Clemens S. Contrasting effects of nicotianamine synthase knockdown on zinc and nickel tolerance and accumulation in the zinc/cadmium hyperaccumulator Arabidopsis halleri. THE NEW PHYTOLOGIST 2015; 206:738-750. [PMID: 25545296 DOI: 10.1111/nph.13237] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2014] [Accepted: 11/13/2014] [Indexed: 06/04/2023]
Abstract
Elevated nicotianamine synthesis in roots of Arabidopsis halleri has been established as a zinc (Zn) hyperaccumulation factor. The main objective of this study was to elucidate the mechanism of nicotianamine-dependent root-to-shoot translocation of metals. Metal tolerance and accumulation in wild-type (WT) and AhNAS2-RNA interference (RNAi) plants were analysed. Xylem exudates were subjected to speciation analysis and metabolite profiling. Suppression of root nicotianamine synthesis had no effect on Zn and cadmium (Cd) tolerance but rendered plants nickel (Ni)-hypersensitive. It also led to a reduction of Zn root-to-shoot translocation, yet had the opposite effect on Ni mobility, even though both metals form coordination complexes of similar stability with nicotianamine. Xylem Zn concentrations were positively, yet nonstoichiometrically, correlated with nicotianamine concentrations. Two fractions containing Zn coordination complexes were detected in WT xylem. One of them was strongly reduced in AhNAS2-suppressed plants and coeluted with (67) Zn-labelled organic acid complexes. Organic acid concentrations were not responsive to nicotianamine concentrations and sufficiently high to account for complexing the coordinated Zn. We propose a key role for nicotianamine in controlling the efficiency of Zn xylem loading and thereby the formation of Zn coordination complexes with organic acids, which are the main Zn ligands in the xylem but are not rate-limiting for Zn translocation.
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Affiliation(s)
- Jean-Yves Cornu
- Department of Plant Physiology, University of Bayreuth, Bayreuth, Germany; INRA, UMR 1391 ISPA, F-33140, Villenave d'Ornon, France; Bordeaux Sciences Agro, UMR 1391 ISPA, F-33170, Gradignan, France
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Fujiwara T, Kawachi M, Sato Y, Mori H, Kutsuna N, Hasezawa S, Maeshima M. A high molecular mass zinc transporter MTP12 forms a functional heteromeric complex with MTP5 in the Golgi inArabidopsis thaliana. FEBS J 2015; 282:1965-79. [DOI: 10.1111/febs.13252] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2014] [Revised: 01/31/2015] [Accepted: 02/26/2015] [Indexed: 11/29/2022]
Affiliation(s)
- Takashi Fujiwara
- Laboratory of Cell Dynamics; Graduate School of Bioagricultural Sciences; Nagoya University; Japan
| | - Miki Kawachi
- Laboratory of Cell Dynamics; Graduate School of Bioagricultural Sciences; Nagoya University; Japan
| | - Yori Sato
- Laboratory of Cell Dynamics; Graduate School of Bioagricultural Sciences; Nagoya University; Japan
| | - Haruki Mori
- Laboratory of Cell Dynamics; Graduate School of Bioagricultural Sciences; Nagoya University; Japan
| | - Natsumaro Kutsuna
- Department of Integrated Biosciences; The University of Tokyo; Japan
- LPixel Inc.; Bunkyo-ku Japan
| | | | - Masayoshi Maeshima
- Laboratory of Cell Dynamics; Graduate School of Bioagricultural Sciences; Nagoya University; Japan
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194
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Tanaka N, Fujiwara T, Tomioka R, Krämer U, Kawachi M, Maeshima M. Characterization of the histidine-rich loop of Arabidopsis vacuolar membrane zinc transporter AtMTP1 as a sensor of zinc level in the cytosol. PLANT & CELL PHYSIOLOGY 2015; 56:510-519. [PMID: 25516571 DOI: 10.1093/pcp/pcu194] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The vacuolar Zn(2+)/H(+) antiporter of Arabidopsis thaliana, AtMTP1, has a long cytosolic histidine-rich loop. A mutated AtMTP1 in which the first half of the loop (His-half) was deleted exhibited a 11-fold higher transport velocity in yeast cells. Transgenic lines overexpressing the His-half-deleted AtMTP1 in the loss-of-function mutant were evaluated for growth and metal content in the presence of various zinc concentrations. These overexpressing lines (35S-AtMTP1 and 35S-His-half lines) showed high tolerance to excess concentrations of zinc at 150 µM, as did the wild type, compared with the loss-of-function line. The His-half AtMTP1 transported cobalt in a heterologous expression assay in yeast, but the cumulative amount of cobalt in 35S-His-half plants was not increased. Moreover, the accumulation of calcium and iron was not changed in plants. Under zinc-deficient conditions, growth of 35S-His-half lines was markedly suppressed. Under the same conditions, the 35S-His-half lines accumulated larger amounts of zinc in roots and smaller amounts of zinc in shoots compared with the other lines, suggesting an abnormal accumulation of zinc in the roots of 35S-His-half lines. As a result, the shoots may exhibit zinc deficiency. Taken together, these results suggest that the His-loop acts as a sensor of cytosolic zinc to maintain an essential level in the cytosol and that the dysfunction of the loop results in an uncontrolled accumulation of zinc in the vacuoles of root cells.
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Affiliation(s)
- Natsuki Tanaka
- Laboratory of Cell Dynamics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, 464-8601 Japan
| | - Takashi Fujiwara
- Laboratory of Cell Dynamics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, 464-8601 Japan
| | - Rie Tomioka
- Laboratory of Cell Dynamics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, 464-8601 Japan
| | - Ute Krämer
- Department of Plant Physiology, Ruhr-University Bochum, D-44801 Bochum, Germany
| | - Miki Kawachi
- Laboratory of Cell Dynamics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, 464-8601 Japan
| | - Masayoshi Maeshima
- Laboratory of Cell Dynamics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, 464-8601 Japan
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195
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Ariani A, Di Baccio D, Romeo S, Lombardi L, Andreucci A, Lux A, Horner DS, Sebastiani L. RNA sequencing of Populus x canadensis roots identifies key molecular mechanisms underlying physiological adaption to excess zinc. PLoS One 2015; 10:e0117571. [PMID: 25671786 PMCID: PMC4324836 DOI: 10.1371/journal.pone.0117571] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 12/28/2014] [Indexed: 11/19/2022] Open
Abstract
Populus x canadensis clone I-214 exhibits a general indicator phenotype in response to excess Zn, and a higher metal uptake in roots than in shoots with a reduced translocation to aerial parts under hydroponic conditions. This physiological adaptation seems mainly regulated by roots, although the molecular mechanisms that underlie these processes are still poorly understood. Here, differential expression analysis using RNA-sequencing technology was used to identify the molecular mechanisms involved in the response to excess Zn in root. In order to maximize specificity of detection of differentially expressed (DE) genes, we consider the intersection of genes identified by three distinct statistical approaches (61 up- and 19 down-regulated) and validate them by RT-qPCR, yielding an agreement of 93% between the two experimental techniques. Gene Ontology (GO) terms related to oxidation-reduction processes, transport and cellular iron ion homeostasis were enriched among DE genes, highlighting the importance of metal homeostasis in adaptation to excess Zn by P. x canadensis clone I-214. We identified the up-regulation of two Populus metal transporters (ZIP2 and NRAMP1) probably involved in metal uptake, and the down-regulation of a NAS4 gene involved in metal translocation. We identified also four Fe-homeostasis transcription factors (two bHLH38 genes, FIT and BTS) that were differentially expressed, probably for reducing Zn-induced Fe-deficiency. In particular, we suggest that the down-regulation of FIT transcription factor could be a mechanism to cope with Zn-induced Fe-deficiency in Populus. These results provide insight into the molecular mechanisms involved in adaption to excess Zn in Populus spp., but could also constitute a starting point for the identification and characterization of molecular markers or biotechnological targets for possible improvement of phytoremediation performances of poplar trees.
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Affiliation(s)
- Andrea Ariani
- BioLabs-Institute of Life Sciences, Scuola Superiore Sant'Anna, I-56127 Pisa, Italy
| | - Daniela Di Baccio
- BioLabs-Institute of Life Sciences, Scuola Superiore Sant'Anna, I-56127 Pisa, Italy
| | - Stefania Romeo
- BioLabs-Institute of Life Sciences, Scuola Superiore Sant'Anna, I-56127 Pisa, Italy
| | - Lara Lombardi
- Department of Biology, Università degli Studi di Pisa, I-56126 Pisa, Italy
| | - Andrea Andreucci
- Department of Biology, Università degli Studi di Pisa, I-56126 Pisa, Italy
| | - Alexander Lux
- Department of Plant Physiology, Faculty of Natural Science, Comenius University in Bratislava, Bratislava, Slovakia
- Institute of Chemistry, Slovak Academy of Sciences, Bratislava, Slovakia
| | | | - Luca Sebastiani
- BioLabs-Institute of Life Sciences, Scuola Superiore Sant'Anna, I-56127 Pisa, Italy
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196
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Lee JH, Lee JH, Jung SH, Hyun TK, Feng M, Kim JY, Lee JH, Lee H, Kim JS, Kang C, Kwon KY, Jung JH. Highly selective fluorescence imaging of zinc distribution in HeLa cells and Arabidopsis using a naphthalene-based fluorescent probe. Chem Commun (Camb) 2015; 51:7463-5. [DOI: 10.1039/c5cc01364j] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
2-(N,N-Dimethylamino)naphthalene-based probe 1 was found to exhibit a dramatic enhancement in fluorescence upon addition of Zn2+, but not with any other metal ions.
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197
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Dimkpa CO, McLean JE, Britt DW, Anderson AJ. Nano-CuO and interaction with nano-ZnO or soil bacterium provide evidence for the interference of nanoparticles in metal nutrition of plants. ECOTOXICOLOGY (LONDON, ENGLAND) 2015; 24:119-29. [PMID: 25297564 DOI: 10.1007/s10646-014-1364-x] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/04/2014] [Indexed: 05/21/2023]
Abstract
The expansion of nanotechnology raises concerns about the consequences of nanomaterials in plants. Here, the effects of nanoparticles (NPs; 100-500 mg/kg) on processes related to micronutrient accumulation were evaluated in bean (Phaseolus vulgaris) exposed to CuO NPs, a mixture of CuO and ZnO (CuO:ZnO) NPs, and in CuO NP-exposed plants colonized by a root bacterium, Pseudomonas chlororaphis O6 (PcO6) in a sand matrix for 7 days. Depending on exposure levels, the inhibition of growth by CuO NPs was more apparent in roots (10-66 %) than shoots (9-25 %). In contrast, CuO:ZnO NPs or root colonization with PcO6 partially mitigated growth inhibition. At 500 mg/kg exposure, CuO NPs increased soluble Cu in the growth matrix by 23-fold, relative to the control, while CuO:ZnO NPs increased soluble Cu (26-fold), Zn (127-fold) and Ca (4.5-fold), but reduced levels of Fe (0.8-fold) and Mn (0.75-fold). Shoot accumulations of Cu (3.8-fold) and Na (1-fold) increased, while those of Fe (0.4-fold), Mn (0.2-fold), Zn (0.5-fold) and Ca (0.5-fold) were reduced with CuO NP (500 mg/kg) exposure. CuO:ZnO NPs also increased shoot Cu, Zn and Na levels, while decreasing that of Fe, Mn, Ca and Mg. Root colonization reduced shoot uptake of Cu and Na, 15 and 24 %, respectively. CuO NPs inhibited ferric reductase (up to 49 %) but stimulated cupric (up to 273 %) reductase activity; while CuO:ZnO NPs or root colonization by PcO6 altered levels of ferric, but not copper reductase activity, relative to CuO NPs. Cu ions at the level released from the NPs did not duplicate these effects. Our findings demonstrate that in addition to the apparent phytotoxic effects of NPs, NP exposure may also have subtle impacts on secondary processes such as metal nutrition.
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198
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Zargar SM, Fujiwara M, Inaba S, Kobayashi M, Kurata R, Ogata Y, Fukao Y. Correlation analysis of proteins responsive to Zn, Mn, or Fe deficiency in Arabidopsis roots based on iTRAQ analysis. PLANT CELL REPORTS 2015; 34:157-66. [PMID: 25366567 DOI: 10.1007/s00299-014-1696-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Revised: 09/21/2014] [Accepted: 10/07/2014] [Indexed: 05/25/2023]
Abstract
For discovering the functional correlation between the identified and quantified proteins by iTRAQ analysis, here we propose a correlation analysis method with cosine correlation coefficients as a powerful tool. iTRAQ analysis is a quantitative proteomics approach that enables identification and quantification of a large number of proteins. In order to obtain proteins responsive to Zn, Mn, or Fe mineral deficiency, we conducted iTRAQ analysis using a microsomal fraction of protein extractions from Arabidopsis root tissues. We identified and quantified 730 common proteins in three biological replicates with less than 1 % false discovery rate. To determine the role of these proteins in tolerating mineral deficiencies and their relation to each other, we calculated cosine correlation coefficients and represented the outcomes on a correlation map for visual understanding of functional relations among the identified proteins. Functionally similar proteins were gathered into the same clusters. Interestingly, a cluster of proteins (FRO2, IRT1, AHA2, PDR9/ABCG37, and GLP5) highly responsive to Fe deficiency was identified, which included both known and unknown novel proteins involved in tolerating Fe deficiency. We propose that the correlation analysis with the cosine correlation coefficients is a powerful method for finding important proteins of interest to several biological processes through comprehensive data sets.
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Affiliation(s)
- Sajad Majeed Zargar
- Plant Global Education Project Graduate School of Biological Sciences, Nara Institute of Science and Technology, Takayama, 8916-5, Ikoma, 630-0192, Japan
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199
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Briat JF, Rouached H, Tissot N, Gaymard F, Dubos C. Integration of P, S, Fe, and Zn nutrition signals in Arabidopsis thaliana: potential involvement of PHOSPHATE STARVATION RESPONSE 1 (PHR1). FRONTIERS IN PLANT SCIENCE 2015; 6:290. [PMID: 25972885 PMCID: PMC4411997 DOI: 10.3389/fpls.2015.00290] [Citation(s) in RCA: 126] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 04/09/2015] [Indexed: 05/18/2023]
Abstract
Phosphate and sulfate are essential macro-elements for plant growth and development, and deficiencies in these mineral elements alter many metabolic functions. Nutritional constraints are not restricted to macro-elements. Essential metals such as zinc and iron have their homeostasis strictly genetically controlled, and deficiency or excess of these micro-elements can generate major physiological disorders, also impacting plant growth and development. Phosphate and sulfate on one hand, and zinc and iron on the other hand, are known to interact. These interactions have been partly described at the molecular and physiological levels, and are reviewed here. Furthermore the two macro-elements phosphate and sulfate not only interact between themselves but also influence zinc and iron nutrition. These intricated nutritional cross-talks are presented. The responses of plants to phosphorus, sulfur, zinc, or iron deficiencies have been widely studied considering each element separately, and some molecular actors of these regulations have been characterized in detail. Although some scarce reports have started to examine the interaction of these mineral elements two by two, a more complex analysis of the interactions and cross-talks between the signaling pathways integrating the homeostasis of these various elements is still lacking. However, a MYB-like transcription factor, PHOSPHATE STARVATION RESPONSE 1, emerges as a common regulator of phosphate, sulfate, zinc, and iron homeostasis, and its role as a potential general integrator for the control of mineral nutrition is discussed.
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Affiliation(s)
- Jean-François Briat
- *Correspondence: Jean-François Briat, Biochimie et Physiologie Moléculaire des Plantes, Centre National de la Recherche Scientifique – Institut National de la Recherche Agronomique – Université Montpellier 2, SupAgro, Bat 7, 2 Place Viala, 34060 Montpellier Cedex 1, France
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200
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Bouain N, Shahzad Z, Rouached A, Khan GA, Berthomieu P, Abdelly C, Poirier Y, Rouached H. Phosphate and zinc transport and signalling in plants: toward a better understanding of their homeostasis interaction. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:5725-41. [PMID: 25080087 DOI: 10.1093/jxb/eru314] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Inorganic phosphate (Pi) and zinc (Zn) are two essential nutrients for plant growth. In soils, these two minerals are either present in low amounts or are poorly available to plants. Consequently, worldwide agriculture has become dependent on external sources of Pi and Zn fertilizers to increase crop yields. However, this strategy is neither economically nor ecologically sustainable in the long term, particularly for Pi, which is a non-renewable resource. To date, research has emphasized the analysis of mineral nutrition considering each nutrient individually, and showed that Pi and Zn homeostasis is highly regulated in a complex process. Interestingly, numerous observations point to an unexpected interconnection between the homeostasis of the two nutrients. Nevertheless, despite their fundamental importance, the molecular bases and biological significance of these interactions remain largely unknown. Such interconnections can account for shortcomings of current agronomic models that typically focus on improving the assimilation of individual elements. Here, current knowledge on the regulation of the transport and signalling of Pi and Zn individually is reviewed, and then insights are provided on the recent progress made towards a better understanding of the Zn-Pi homeostasis interaction in plants.
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Affiliation(s)
- Nadia Bouain
- Biochimie et Physiologie Moléculaire des Plantes, Institut National de la Recherche Agronomique, Centre National de la Recherche Scientifique, Université Montpellier 2, Montpellier SupAgro. Bat 7, 2 place Viala, 34060 Montpellier cedex 2, France Laboratoire Des Plantes Extrêmophile, Centre de Biotechnologie de Borj Cédria, BP 901, 2050 Hammam-Lif, Tunisia
| | - Zaigham Shahzad
- Biochimie et Physiologie Moléculaire des Plantes, Institut National de la Recherche Agronomique, Centre National de la Recherche Scientifique, Université Montpellier 2, Montpellier SupAgro. Bat 7, 2 place Viala, 34060 Montpellier cedex 2, France
| | - Aida Rouached
- Laboratoire Des Plantes Extrêmophile, Centre de Biotechnologie de Borj Cédria, BP 901, 2050 Hammam-Lif, Tunisia
| | - Ghazanfar Abbas Khan
- Département de Biologie Moléculaire Végétale, Biophore, Université de Lausanne, CH-1015 Lausanne, Switzerland
| | - Pierre Berthomieu
- Biochimie et Physiologie Moléculaire des Plantes, Institut National de la Recherche Agronomique, Centre National de la Recherche Scientifique, Université Montpellier 2, Montpellier SupAgro. Bat 7, 2 place Viala, 34060 Montpellier cedex 2, France
| | - Chedly Abdelly
- Laboratoire Des Plantes Extrêmophile, Centre de Biotechnologie de Borj Cédria, BP 901, 2050 Hammam-Lif, Tunisia
| | - Yves Poirier
- Département de Biologie Moléculaire Végétale, Biophore, Université de Lausanne, CH-1015 Lausanne, Switzerland
| | - Hatem Rouached
- Biochimie et Physiologie Moléculaire des Plantes, Institut National de la Recherche Agronomique, Centre National de la Recherche Scientifique, Université Montpellier 2, Montpellier SupAgro. Bat 7, 2 place Viala, 34060 Montpellier cedex 2, France
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