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Registros recuperados: 11
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A loss-of-function mutation in AtYSL1 reveals its role in iron and nicotianamine seed loading Inra
Le Jean, M.; Schikora, A.; Mari, S.; Briat, J.F.; Curie, C..
Tipo: Journal Article Palavras-chave: BIOLOGIE INTEGRATIVE YSL; IRON; NICOTOANAMINE; TRANSPORT; SEED; CIRCULATION.
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007f04076f6&uri=/notices/prodinra1/2007/01/
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Arabidopsis IRT2 cooperates with the high-affinity iron uptake system to maintain iron homeostasis in root epidermal cells Inra
Vert, G.; Barberon, M.; Zelazny, E.; Seguela, M.; Briat, J.F.; Curie, C..
Iron is an essential nutrient for all organisms but toxic when present in excess. Consequently, plants carefully regulate their iron uptake, dependent on the FRO2 ferric reductase and the IRT1 transporter, to control its homeostasis. Arabidopsis IRT2 gene, whose expression is induced in root epidermis upon iron deprivation, was shown to encode a functional iron/zinc transporter in yeast, and proposed to function in iron acquisition from the soil. In this study, we demonstrate that, unlike its close homolog IRT1, IRT2 is not involved in iron absorption from the soil since overexpression of IRT2 does not rescue the iron uptake defect of irt1-1 mutant and since a null irt2 mutant shows no chlorosis in low iron. Consistently, an IRT2-green fluorescent fusion...
Tipo: Journal Article Palavras-chave: IRT2; IRON UPTAKE; METAL; TRANSPORT; ROOT.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201047eff656&uri=/notices/prodinra1/2010/12/
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Cytokinins negatively regulate the root iron uptake machinery in Arabidopsis through a growth-dependent pathway Inra
Seguela, M.; Briat, J.F.; Vert, G.; Curie, C..
Plants display a number of biochemical and developmental responses to low iron availability in order to increase iron uptake from the soil. The ferric-chelate reductase FRO2 and the ferrous iron transporter IRT1 control iron entry from the soil into the root epidermis. In Arabidopsis, expression of IRT1 and FRO2 is tightly controlled to maintain iron homeostasis, and involves local and long-distance signals, as well as transcriptional and post-transcriptional events. FIT encodes a putative basic helix-loop-helix (bHLH) transcription factor that regulates iron uptake responses in Arabidopsis. Here, we uncover a new regulation of the root iron uptake genes. We show that IRT1, FRO2 and FIT are repressed by the exogenous addition of cytokinins (CKs), and that...
Tipo: Journal Article Palavras-chave: IRON; SIGNALING; HORMONES; CYTOKINIS; TRANSPORT; ROOT GROWTH; METAL TRANSPORT.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200919f801b6&uri=/notices/prodinra1/2009/03/
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High-affinity manganese uptake by NRAMP1 is essential for Arabidopsis growth in low manganese conditions Inra
Cailliatte, R.; Schikora, A.; Briat, J.F.; Mari, S.; Curie, C..
In contrast with many other essential metals, the mechanisms of Mn acquisition in higher eukaryotes are seldom studied and poorly understood. We show here that Arabidopsis thaliana relies on a high-affinity uptake system to acquire Mn from the soil in conditions of low Mn availability and that this activity is catalyzed by the divalent metal transporter NRAMP1 (for Natural Resistance Associated Macrophage Protein 1). The nramp1-1 loss-of-function mutant grows poorly, contains less Mn than the wild type, and fails to take up Mn in conditions of Mn limitation, thus demonstrating that NRAMP1 is the major high-affinity Mn transporter in Arabidopsis. Based on confocal microscopy observation of an NRAMP1-green fluorescent protein fusion, we established that...
Tipo: Journal Article Palavras-chave: METAL TRANSPORT; PLASMA MEMBRANE; IRON REGULATE; MANGANESE TRANSPORTER.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201085711997&uri=/notices/prodinra1/2010/12/
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Identification of the endodermal vacuole as the iron storage compartment in the Arabidopsis embryo Inra
Roschzttardtz, H.; Conejero, G.; Curie, C.; Mari, S..
Deciphering how cellular iron (Fe) pools are formed, where they are localized and which ones are remobilized represents an important challenge to better understand Fe homeostasis. The recent development of imaging techniques, adapted to plants, has helped gain insight into these events. We have analyzed the localization of Fe during embryo development in Arabidopsis with an improved histochemical staining based on Perls coloration intensified by a second reaction with diaminobenzidine and hydrogen peroxide. The procedure, quick to set up and specific for Fe, was applied directly on histological sections, which dramatically increased its sub-cellular resolution. We have thus unambiguously shown that in dry seeds Fe is primarily stored in the endodermis cell...
Tipo: Journal Article Palavras-chave: IRON; FE HOMEOSTASIS ; PERLS COLORATION; DIAMINOBENZIDINE; HYDROGEN PEROXYDE; VIT1-1 MUTANT; PERLS/DAB.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20107fa7720b&uri=/notices/prodinra1/2010/12/
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Increased sensitivity to iron deficiency in Arabidopsis thaliana over-accumulating nicotianamine Inra
Cassin, G.; Mari, S.; Curie, C.; Briat, J.F.; Czernic, P..
Nicotianamine (NA) is a non-protein amino acid derivative synthesized from S-adenosyl L-methionine able to bindseveral metal ions such as iron, copper, manganese, zinc, or nickel. In plants, NA appears to be involved in ironavailability and is essential for the plant to complete its biological cycle. In graminaceous plants, NA is also theprecursor in the biosynthesis of phytosiderophores. Arabidopsis lines accumulating 4- and 100-fold more NA thanwild-type plants were used in order to evaluate the impact of such an NA overaccumulation on iron homeostasis.The expression of iron-regulated genes including the IRT1/FRO2 iron uptake system is highly induced at thetranscript level under both iron-sufficient and iron-deficient conditions. Nevertheless, NA...
Tipo: Journal Article Palavras-chave: APOPLAST; IRON HOMEOSTASIS; NICOTIANAMINE.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009ecffad7d&uri=/notices/prodinra1/2010/08/
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Iron uptake and storage in plants Inra
Briat, J.F.; Arnaud, N.; Cellier, F.; Curie, C.; Gaymard, F.; Ravet, K.; Seguela, M.; Vert, G..
Tipo: Journal Article Palavras-chave: FERRIC CHELATE; METAL TRANSPORT; IRON; ROOT; SACCHAROMYCES CEREVISIAE; FERRIN GENE EXPRESSION; IRT1.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20076a9b48c7&uri=/notices/prodinra1/2007/09/
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Iron utilization and metabolism in plants Inra
Briat, J.F.; Curie, C.; Gaymard, F..
The solubilization and long-distance allocation of iron between organs and tissues, as well as its subcellular compartmentalization and remobilization, involve various chelation and oxidation/reduction steps, transport activities and association with soluble proteins that store and buffer this metal. Maintaining iron homeostasis is an important determinant in building prosthetic groups such as heme and Fe-S clusters, and in assembling them into apoproteins, which are major components of plant metabolism. Such processes require complex protein machineries located in mitochondria and plastids. An essential role for iron metabolism and utilization in plant productivity is evidenced by the strong iron requirement for proper photosynthetic reactions.
Tipo: Journal Article Palavras-chave: IRON TRANSPORT; NICOTIANAMINE; YEAST MUTANT; FE-S.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200765e13c6b&uri=/notices/prodinra1/2007/09/
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Mobilization of vacuolar iron by AtNRAMP3 and AtNRAMP4 is essential for seed germination on low iron. Inra
Lanquar, V.; Lelièvre, F.; Bolte, S.; Hamès, C.; Alcon, C.; Neumann, D.; Vansuyt, G.; Curie, C.; Schröder, A.; Krämer, U.; Barbier-Brygoo, H.; Thomine, S..
Iron (Fe) is necessary for all living cells, but its bioavailability is often limited. Fe deficiency limits agriculture in many areas and affects over a billion human beings worldwide. In mammals, NRAMP2/DMT1/DCT1 was identified as a major pathway for Fe acquisition and recycling. Inplants, AtNRAMP3 and AtNRAMP4 are induced under Fe deficiency. The similitude of AtNRAMP3 and AtNRAMP4 expression patterns and their common targeting to the vacuole, together with the lack of obvious phenotype in nramp3-1 and nramp4-1 single knockout mutants, suggested a functional redundancy. Indeed, the germination of nramp3 nramp4 double mutants is arrested under low Fe nutrition and fully rescued by high Fe supply. Mutant seeds have wild type Fe content, but fail to...
Tipo: Journal Article Palavras-chave: GERMINATION; IRON NUTRITION; NRAMP TRANSPORTERS; VACUOLE.
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20079c8ed51f&uri=/notices/prodinra1/2007/09/
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Straightforward histochemical staining of Fe by the adaptation of an old-school technique: Identification of the endodermal vacuole as the site of Fe storage in Arabidopsis embryos Inra
Roschzttardtz, H.; Conejero, G.; Curie, C.; Mari, S..
Iron (Fe) is an essential metal ion, required for basic cellular processes such as respiration, photosynthesis and cell division. Therefore, Fe has to be stored and distributed to several organelles to fulfill its roles. The molecular basis of Fe distribution is poorly understood. In this context, elemental imaging approaches are becoming essential for a better understanding of metal homeostasis in plants. Recently, several genes have been involved in Fe storage (VIT1) and remobilization (NRAMP3 and NRAMP4) in the seed of Arabidopsis, mostly with the help of sophisticated imaging techniques. We have adapted an histochemical procedure to detect Fe in plant tissues, based on Perls staining coupled to diaminobenzidine (DAB) intensification. The Perls/DAB...
Tipo: Journal Article Palavras-chave: HISTOCHIMIE; ONTOGENESE; ENDODERME IRON; VACUOLE; ENDODERMIS; EMBRYO.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201165cf7b7c&uri=/notices/prodinra1/2011/06/
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The NRAMP6 metal transporter contributes to cadmium toxicity Inra
Caillatte, R.; Lapeyre, B.; Briat, J.F.; Mari, S.; Curie, C..
NRAMP (natural resistance-associated macrophage protein) homologues are evolutionarily conserved bivalent metal transporters. In Arabidopsis, AtNRAMP3 and AtNRAMP4 play a key role in iron nutrition of the germinating plantlet by remobilizing vacuolar iron stores. In the present paper we describe the molecular and physiological characterization of AtNRAMP6. AtNRAMP6 is predominantly expressed in the dry seed embryo and to a lesser extent in aerial parts. Its promoter activity is found diffusely distributed in cotyledons and hypocotyl, as well as in the vascular tissue region of leaf and flower. We show that the AtNRAMP6 transcript coexists with a partially spliced isoform in all shoot cell types tested. When expressed in yeast, AtNRAMP6, but not its...
Tipo: Journal Article Palavras-chave: CADMIUM; ENDOMEMBRANE; HEAVY METAL; NATURAL RESISTANCE-ASSOCIATED MACROPHAGE PROTEIN (NRAMP); TOXICITY; TRANSPORT.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010b8fa4db6&uri=/notices/prodinra1/2010/01/
Registros recuperados: 11
Primeira ... 1 ... Última
 

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