Search

Your search keyword '"TRUONG, HOAI‐NAM"' showing total 46 results
Start Over Author "TRUONG, HOAI‐NAM"
46 results on '"TRUONG, HOAI‐NAM"'

2. Ultratough and self‐healable electromagnetic interference shielding materials with sandwiched silver nanowires in polyurethane composite films.

Author

Nguyen, Duy Khiem, Truong, Hoai Nam, Pham, Ai Le Hoang, Tran, Minh Sang, Nguyen Dinh, Minh Tuan, Bui, Viet Quoc, Lien, Mai Thi Kieu, Nguyen, Van Cuong, and Vu, Minh Canh

Subjects
*ELECTROMAGNETIC shielding, *ELECTROMAGNETIC interference, *LIGHTWEIGHT materials, *WEARABLE technology, *ELECTROMAGNETIC radiation, *NANOWIRES
Abstract

This study presents a facile self‐healing electromagnetic interference (EMI) shielding composite by sandwiching a layer of silver nanowires (AgNWs) between two layers of self‐healing polyurethane (SPU). The AgNWs layer forms an interconnected conductive network that effectively reflects and absorbs electromagnetic radiation, providing efficient EMI shielding. The SPU layers contribute autonomous healing of mechanical damages and restoring structural integrity and conductive pathways. The composite films exhibit remarkable EMI shielding effectiveness (SE) (up to 64.6 dB), exceptional mechanical toughness (106.4 MJ/m3), and self‐healing capabilities, outperforming conventional shielding materials. The synergy between AgNWs and SPU layers offers lightweight, flexible, tough, and self‐healing properties, making this material highly promising for applications in wearable electronics, aerospace, and automotive industries where durability and long‐term reliability are critical. Highlights: Facile fabrication of sandwiched AgNWs layer between SPU films.Sandwiched AgNWs/SPU films with exceptional EMI shielding.AgNWs form conductive networks for efficient EMI shielding.Remarkable mechanical toughness of 106.4 MJ/m3 and self‐healing capability.Potential shielding materials for lightweight, wearable electronics, aerospace. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

10. Chapter 5.2.1.6 - Phosphorus control of plant interactions with mutualistic and pathogenic microorganisms: a mini‐review and a case study of the Medicago truncatulaB9 mutant

Author

Thalineau, Elise, Fournier, Carine, Jeandroz, Sylvain, Truong, Hoai-Nam, Agroécologie [Dijon], Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Université Bourgogne Franche-Comté [COMUE] (UBFC), Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), and Bruijn, Frans de

Subjects
B9 mutant, Nutrient limitation, fungi, Medicago truncatula, food and beverages, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, Phosphorus, plant immunity, Nod Factor Perception gene (NFP)
Abstract

Prod 2020-8b pole SPE IPM AGROSUP; International audience; Phosphorus (P) is an important macroelement necessary for plant growth and development but is often limiting in the environment. Plants adapt to P limitation by initiating a P starvation response (PSR) to better adjust their development and metabolism to this limiting resource. Not surprisingly, P plays a key role in mutualistic and pathogenic interactions. After a brief review on the regulation of plant–microbe interactions by P, we will discuss whether the Medicago truncatula B9 mutant which displays an altered P status and which is hypermycorrhizal, partially nodulation‐defective and hypersusceptible to the pathogen Aphanomyces euteiches could represent a case of P control of plant immunity in the light of recent findings in this field.

Published
2020
Full Text
View/download PDF

15. Application of Managed Pressure Drilling on a Semisubmersible Tender-Assisted Rig to Address Drilling Challenges in HPHT Gas Condensate Wells, Offshore Vietnam

Author

Nguyen Xuan Cuong, Truong Hoai Nam, Bao Ta Quoc, Do Van Khanh, Hoang Thanh Tung, Trinh Ngoc Bao, Tran Nam Hung, Dang Anh Tuan, Ngo Huu Hai, Tan Chai Yong, Nguyen Pham Huy Cuong, and Harpreet Kaur Dalgit Singh

Subjects
Petroleum engineering, Drilling, Submarine pipeline, Geology
Abstract

High-pressure, high-temperature (HP/HT) environments often present kick and losses scenarios. Bien Dong POC Well-1 serves as an example of such scenarios with a very narrow-pressure operating window. Operational pressure challenges prohibited achieving the objectives. While drilling the Bien Dong Well-1, the well encountered ballooning issues, high pore pressures, and a narrow window. As part of remedial actions when drilling Bien Dong Well-2 & Well-3, the Bien Dong POC drilling team decided to deploy MPD technology with constant bottomhole pressure and early kick-loss detection capabilities. By applying MPD techniques, the team drilled the 12-1/4-in. hole section with the lowest possible mud weight to accommodate the narrow drilling window. Drilling the well sections to total depth (TD) took only 10 days in Well-2 and 14 days in Well-3. MPD also allowed stripping out of the hole with surface backpressure (SBP) instead of pumping out of the hole to minimize swab once in shoe, which reduced trips for considerable rig-time savings. The wells were drilled using MPD technology on a semisubmersible tender-assisted rig. A comprehensive rig survey was conducted during the planning phase of rig construction. The survey outlined the permanent installation of the MPD system, including an automated MPD choke manifold and docking-station rotating control device (RCD). The MPD equipment was integrated into the rig on a flexible plug-and-play basis to enable easy rig up and rig down. The integration also enabled moving the equipment between wells when the rig skids and during the MPD operation. The success of MPD operations came through cooperation with team members, experience from lessons learned, and excellence in rig crew performance on well after well. This paper will discuss how MPD technology led to campaign improvements and cost savings throughout Bien Dong Well-2 and Well-3.

Published
2018
Full Text
View/download PDF

16. Nitrogen modulation of Medicago truncatula resistance to Aphanomyces euteiches depends on plant genotype

Author

Thalineau, Elise, Fournier, Carine, Gravot, Antoine, Wendehenne, David, Jeandroz, Sylvain, Truong, Hoai-Nam, Agroécologie [Dijon], Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Université Bourgogne Franche-Comté [COMUE] (UBFC), Institut de Génétique, Environnement et Protection des Plantes (IGEPP), AGROCAMPUS OUEST-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National de la Recherche Agronomique (INRA), Ministère de l'Enseignement Supérieur et de la Recherche, AgroSup Dijon, PARI8, Conseil Régional de Bourgogne, Institut National de la Recherche Agronomique (INRA)-Université de Rennes (UR)-AGROCAMPUS OUEST, Université de Bourgogne (UB)-Institut National de la Recherche Agronomique (INRA)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Institut National de la Recherche Agronomique (INRA)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-AGROCAMPUS OUEST, and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)

Subjects
Nitrates, Genotype, plant defence, Glutamine, fungi, food and beverages, Original Articles, Aphanomyces, nitrogen, Aphanomyces euteiches, Gene Expression Regulation, Plant, nitrate, Medicago truncatula, Amino acids, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, Plant Proteins
Abstract

SPEIPMAgrosupINRAUB DOCT; International audience; Nitrogen (N) availability can impact plant resistance to pathogens by the regulation of plant immunity. To better understand the links between N nutrition and plant defence, we analysed the impact of N availability on Medicago truncatula resistance to the root pathogen Aphanomyces euteiches. This oomycete is considered to be the most limiting factor for legume production. Ten plant genotypes were tested in vitro for their resistance to A. euteiches in either complete or nitrate-deficient medium. N deficiency led to enhanced or reduced susceptibility depending on the plant genotype. Focusing on four genotypes displaying contrasting responses, we determined the impact of N deficiency on plant growth and shoot N concentration, and performed expression analyses on N- and defence-related genes, as well as the quantification of soluble phenolics and different amino acids in roots. Our analyses suggest that N modulation of plant resistance is not linked to plant response to N deprivation or to mechanisms previously identified to be involved in plant resistance. Furthermore, our studies highlight a role of glutamine in mediating the susceptibility to A. euteiches in M. truncatula.

Published
2018
Full Text
View/download PDF

18. Apo-siderophores promote growth of iron-deficient Arabidopsisplants by mobilizing iron from roots to shoots and reducing oxidative stress in roots

Author

Truong, Hoai-Nam, Fournier, Carine, Hichami, Siham, Dole, Léna, Leroy, Fanny, Wendehenne, David, Nicolas-Francès, Valérie, and Besson-Bard, Angélique

Abstract

•The siderophore deferoxamine stimulates growth of iron-deficient Arabidopsis plants.•This growth promotion depends on the amount of iron stored in the roots.•It involves an enhanced remobilization of iron from root reserves to shoots.•Deferoxamine lowers root oxidative stress, counteracting growth inhibition by H2O2.•Thus, growth promotion by deferoxamine occurs via perturbation of iron homeostasis.

Published
2024
Full Text
View/download PDF

19. Effects of nitrogen nutrition and plant genotype on Medicago truncatula resistance against Aphanomyces euteiches

Author

Thalineau, Elise, Fournier, Carine, Wendehenne, David, Jeandroz, Sylvain, Truong, Hoai-Nam, Agroécologie [Dijon], Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, and Dijon (Kevin Oudard), Institut Agro

Subjects
Aphanomyces euteiches, Nitrogen nutrition, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, [SDV.BV] Life Sciences [q-bio]/Vegetal Biology
Published
2016

22. The Medicago truncatula hypermycorrhizal B9 mutant displays an altered response to phosphate and is more susceptible to Aphanomyces euteiches

Author

Truong, Hoai-Nam, Thalineau, Elise, Bonneau, Laurent, Fournier, Carine, Potin, Sophie, Balzergue, Sandrine, Tuinen, Diederik, Jeandroz, Sylvain, Morandi, Dominique, Agroécologie [Dijon], Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Unité de recherche en génomique végétale (URGV), Institut National de la Recherche Agronomique (INRA)-Université d'Évry-Val-d'Essonne (UEVE)-Centre National de la Recherche Scientifique (CNRS), Burgundy Regional Council [FABER 2009-9201AAO036500681, PARI Agrale 8], Ministere de l'Enseignement Superieur et de la Recherche [2013-32], Institut National de la Recherche Agronomique ( INRA ) -Université de Bourgogne ( UB ) -AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Institut National de la Recherche Agronomique ( INRA ) -Université de Bourgogne ( UB ) -AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Université Bourgogne Franche-Comté ( UBFC ), Institut de recherche, santé, environnement et travail ( Irset ), Université d'Angers ( UA ) -Université de Rennes 1 ( UR1 ), Université de Rennes ( UNIV-RENNES ) -Université de Rennes ( UNIV-RENNES ) -École des Hautes Études en Santé Publique [EHESP] ( EHESP ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ) -Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ) -Université des Antilles ( UA ), POPS Transcriptomic Platform, Institut National de la Recherche Agronomique ( INRA ) -Université d'Évry-Val-d'Essonne ( UEVE ) -Université Paris-Saclay-Centre National de la Recherche Scientifique ( CNRS ) -Institute of Plant Sciences Paris-Saclay, and Centre National de la Recherche Scientifique (CNRS)-Université d'Évry-Val-d'Essonne (UEVE)-Institut National de la Recherche Agronomique (INRA)

Subjects
arbuscular mycorrhiza, Gene Expression Profiling, fungi, food and beverages, Aphanomyces, Plant Roots, symbiosis, Phosphates, Anthocyanins, Phenotype, [ SDV.SA.AGRO ] Life Sciences [q-bio]/Agricultural sciences/Agronomy, Gene Expression Regulation, Plant, nutrients, Mycorrhizae, Medicago truncatula, Mutation, Cluster Analysis, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, Disease Susceptibility, signalling, transcriptome, Plant Shoots, Oligonucleotide Array Sequence Analysis, Signal Transduction
Abstract

International audience; Inorganic phosphate (Pi) plays a key role in the development of arbuscular mycorrhizal (AM) symbiosis, which is favoured when Pi is limiting in the environment. We have characterized the Medicago truncatula hypermycorrhizal B9 mutant for its response to limiting (P/10) and replete (P2) Pi. On P2, mycorrhization was significantly higher in B9 plants than in wild-type (WT). The B9 mutant displayed hallmarks of Pi-limited plants, including higher levels of anthocyanins and lower concentrations of Pi in shoots than WT plants. Transcriptome analyses of roots of WT and B9 plants cultivated on P2 or on P/10 confirmed the Pi-limited profile of the mutant on P2 and highlighted its altered response to Pi on P/10. Furthermore, the B9 mutant displayed a higher expression of defence/stress-related genes and was more susceptible to infection by the root oomycete pathogen Aphanomyces euteiches than WT plants. We propose that the hypermycorrhizal phenotype of the B9 mutant is linked to its Pi-limited status favouring AM symbiosis in contrast to WT plants in Pi-replete conditions, and discuss the possible links between the altered response of the B9 mutant to Pi, mycorrhization and infection by A. euteiches. We have characterized the response to phosphate of the hypermycorrhizal mutant B9 of Medicago truncatula. We show through physiological approaches, root architecture analyses and transcriptomics that this mutant displays an altered response to phosphate. We propose that the hypermycorrhizal phenotype of the B9 mutant is linked to its Pi-limited status favoring AM symbiosis. In addition this mutant is more susceptible to the oomycete Aphanomyces euteiches, suggesting possible links between symbiosis, pathogenesis and response to phosphate.

Published
2014
Full Text
View/download PDF

24. RhizoTubes as a new tool for high throughput imaging of plant root development and architecture: test, comparison with pot grown plants and validation

Author

Jeudy, Christian, primary, Adrian, Marielle, additional, Baussard, Christophe, additional, Bernard, Céline, additional, Bernaud, Eric, additional, Bourion, Virginie, additional, Busset, Hughes, additional, Cabrera-Bosquet, Llorenç, additional, Cointault, Frédéric, additional, Han, Simeng, additional, Lamboeuf, Mickael, additional, Moreau, Delphine, additional, Pivato, Barbara, additional, Prudent, Marion, additional, Trouvelot, Sophie, additional, Truong, Hoai Nam, additional, Vernoud, Vanessa, additional, Voisin, Anne-Sophie, additional, Wipf, Daniel, additional, and Salon, Christophe, additional

Published
2016
Full Text
View/download PDF

26. Nitrogen modulation of <italic>Medicago truncatula</italic> resistance to <italic>Aphanomyces euteiches</italic> depends on plant genotype.

Author

Thalineau, Elise, Fournier, Carine, Gravot, Antoine, Wendehenne, David, Jeandroz, Sylvain, and Truong, Hoai‐Nam

Subjects
EFFECT of nitrogen on plants, APHANOMYCES euteiches, MEDICAGO truncatula, PLANT genes, PLANT diseases, PHYTOPATHOGENIC microorganisms
Abstract

Summary: Nitrogen (N) availability can impact plant resistance to pathogens by the regulation of plant immunity. To better understand the links between N nutrition and plant defence, we analysed the impact of N availability on Medicago truncatula resistance to the root pathogen Aphanomyces euteiches. This oomycete is considered to be the most limiting factor for legume production. Ten plant genotypes were tested in vitro for their resistance to A. euteiches in either complete or nitrate‐deficient medium. N deficiency led to enhanced or reduced susceptibility depending on the plant genotype. Focusing on four genotypes displaying contrasting responses, we determined the impact of N deficiency on plant growth and shoot N concentration, and performed expression analyses on N‐ and defence‐related genes, as well as the quantification of soluble phenolics and different amino acids in roots. Our analyses suggest that N modulation of plant resistance is not linked to plant response to N deprivation or to mechanisms previously identified to be involved in plant resistance. Furthermore, our studies highlight a role of glutamine in mediating the susceptibility to A. euteiches in M. truncatula. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

27. CO2-CH4 exchange in the context of CO2 injection and gas production from methane hydrates bearing sediments

Author

Le Quang, Duyen, Herri, Jean-Michel, Ouabbas, Yamina, Truong Hoai, Nam, Le Quang, Du, Centre Sciences des Processus Industriels et Naturels (SPIN-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Laboratoire des Procédés en Milieux Granulaires (LPMG-EMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Département PROcédés Poudres, Interfaces, Cristallisation et Ecoulements (PROPICE-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-SPIN, Petrovietnam Research Institute, Vietnam National Oil and Gas Group, VAST, Académie des Sciences et de Technologie du Vietnam, Petrovietnam, Académie des Sciences et de la Technologie du Vietnam, and Toucas, Andrée-Aimée

Subjects
CO2, methane hydrates, [SPI.GPROC] Engineering Sciences [physics]/Chemical and Process Engineering, gas clathrate hydrates, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, CH4
Abstract

http://www.vpi.pvn.vn/upload/file/TapChiDauKhi/THNam-so10.pdf; In recent decades, scientists have made an amazing discovery: Methane hydrates in the ocean floor. These solid compounds could represent an important energy reserve. Today it is estimated that they contain equivalent carbon in the form of methane in a huge quantity, twice as much as all deposits of natural gas, oil and coal. In the near future, we need evaluate the possibility to produce this new source of energy, particularly in replacement of oil and coal. The main question concerns the technology to be used because the methane hydrates are distributed in sediment, and they participate to their consolidation. In this paper, we present a method which doesn't modify the structure of the sediment, by replacing the methane hydrate by CO2 hydrate after injection of CO2 gas.

Published
2012

28. Identification of new genes in the plant response to nitrogen starvation or nitrogen supply

Author

Pocholle, Delphine, Gaudon, Virginie, Dorbe, M.F., Leydecker, M.T., Boutet-Mercey, Stéphanie, Morot Gaudry, Jean-François, Truong, Hoai-Nam, Krapp, Annemarie, Ferrario-Mery, Sylvie, Dinant, Sylvie, Vilaine, Francoise, Daniel-Vedele, Francoise, Meyer, Christian, Unité de recherche Nutrition Azotée des Plantes (URNAP), Institut National de la Recherche Agronomique (INRA), Laboratoire de biologie cellulaire et moléculaire, Institut Jean-Pierre Bourgin (IJPB), Institut National de la Recherche Agronomique (INRA)-AgroParisTech, Unité de Recherche Nutrition Azotée des Plantes, and Unité de Nutrition Azotée des Plantes

Subjects
[SDV.BV.AP]Life Sciences [q-bio]/Vegetal Biology/Plant breeding, [SDV]Life Sciences [q-bio], [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, [SDV.BBM.BM]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Molecular biology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2003

29. Introduction to N metabolism regulation

Author

Hirel, Bertrand, Truong, Hoai Nam, Unité de recherche Nutrition Azotée des Plantes (URNAP), Institut National de la Recherche Agronomique (INRA), and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], ASSIMILATION DE L'AZOTE, [SDV]Life Sciences [q-bio]
Abstract

*INRA laboratoire du métabolisme et nutrition des plantes Versailles (FRA) Diffusion du document : INRA laboratoire du métabolisme et nutrition des plantes Versailles (FRA)

Published
1999

31. Utilisation de la transgenese pour l'analyse du metabolisme du nitrate

Author

Truong, Hoai Nam, Vaucheret, Herve, Quillere, Isabelle, Morot-Gaudry, J.F., Caboche, Michel, Laboratoire de biologie cellulaire et moléculaire, Institut National de la Recherche Agronomique (INRA), Unité de recherche Nutrition Azotée des Plantes (URNAP), and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], BIOTECHNOLOGIE, [SDV]Life Sciences [q-bio], BETA GLUCURONIDASE, BIOLOGIE MOLECULAIRE, ComputingMilieux_MISCELLANEOUS, METHODOLOGIE, AZOTE COMPOSE
Abstract

National audience

Published
1994

32. Structure and regulation of nitrate reductase in Solanaceous species

Author

Daniel Vedele, Francoise, Dorbe, M.F., Faure, Jean Denis, Godon, C., Meyer, Christian, Moureaux, T., Nussaume, Laurent, Rouzé, Pierre, Truong, Hoai Nam, Caboche, Michel, Unité de recherche Génétique et amélioration des plantes (GAP), Institut National de la Recherche Agronomique (INRA), and Laboratoire de biologie cellulaire et moléculaire

Subjects
STRUCTURE, [SDV]Life Sciences [q-bio], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
1994

34. The use of mutagenesis and genetic engineering to study nitrate metabolism in Nicotiana

Author

Vincentz, M., Moureaux, T., Becker, T., Meyer, Christian, Truong, Hoai Nam, Daniel Vedele, Francoise, Godon, C., Vaucheret, Herve, Marion Poll, Annie, Caboche, Michel, ProdInra, Migration, Laboratoire de biologie cellulaire et moléculaire, Institut National de la Recherche Agronomique (INRA), and Unité de recherche Génétique et amélioration des plantes (GAP)

Subjects
[SDV.BV.BOT]Life Sciences [q-bio]/Vegetal Biology/Botanics, ComputingMilieux_MISCELLANEOUS, [SDV.BV.BOT] Life Sciences [q-bio]/Vegetal Biology/Botanics
Abstract

International audience

Published
1992

36. The M edicago truncatula hypermycorrhizal B9 mutant displays an altered response to phosphate and is more susceptible to A phanomyces euteiches.

Author

TRUONG, HOAI‐NAM, THALINEAU, ELISE, BONNEAU, LAURENT, FOURNIER, CARINE, POTIN, SOPHIE, BALZERGUE, SANDRINE, TUINEN, DIEDERIK, JEANDROZ, SYLVAIN, and MORANDI, DOMINIQUE

Subjects
*MEDICAGO truncatula, *MYCORRHIZAS, *PLANT mutation, *ANTHOCYANINS, *PLANT diseases
Abstract

Inorganic phosphate ( Pi) plays a key role in the development of arbuscular mycorrhizal ( AM) symbiosis, which is favoured when Pi is limiting in the environment. We have characterized the M edicago truncatula hypermycorrhizal B9 mutant for its response to limiting ( P/10) and replete ( P2) Pi. On P2, mycorrhization was significantly higher in B9 plants than in wild-type ( WT). The B9 mutant displayed hallmarks of Pi-limited plants, including higher levels of anthocyanins and lower concentrations of Pi in shoots than WT plants. Transcriptome analyses of roots of WT and B9 plants cultivated on P2 or on P/10 confirmed the Pi-limited profile of the mutant on P2 and highlighted its altered response to Pi on P/10. Furthermore, the B9 mutant displayed a higher expression of defence/stress-related genes and was more susceptible to infection by the root oomycete pathogen A phanomyces euteiches than WT plants. We propose that the hypermycorrhizal phenotype of the B9 mutant is linked to its Pi-limited status favouring AM symbiosis in contrast to WT plants in Pi-replete conditions, and discuss the possible links between the altered response of the B9 mutant to Pi, mycorrhization and infection by A . euteiches. [ABSTRACT FROM AUTHOR]

Published
2015
Full Text
View/download PDF

43. Regulation of C/N Interaction in Model Plant Species.

Author

Krapp, Anne and Truong, Hoai-Nam

Subjects
PLANT metabolism, PLANT species, CROPS, NITROGEN, NITROGEN compounds, PLANT physiology, PLANT growth, PLANT development, NITROGEN in agriculture, PHOTOBIOLOGY
Abstract

Carbon (C) and nitrogen (N) metabolisms are two major metabolic pathways which have been intensively studied in plants. Both N and C metabolisms are tightly linked in numerous plant biochemical pathways. Therefore the C to N ratio has to be carefully regulated to ensure proper functioning of the huge metabolic network. In order to maintain a viable C/N status under a large range of growth conditions plants have evolved complex mechanisms to regulate the delicate network of these two major assimilatory pathways. C and N metabolisms are both highly regulated. We will present the current knowledge on the regulation of N and C metabolisms by sugars and N metabolites. Players involved in these regulatory processes are just starting to be uncovered and possible signaling molecules involved in these regulations as well as known or potential candidate regulatory genes will be discussed. [ABSTRACT FROM PUBLISHER]

Published
2005
Full Text
View/download PDF

44. Sequence and characterization of two Arabidopsis thalianacDNAs isolated by functional complementation of a yeast gln3 gdh1mutant

Author

Truong, Hoai-Nam, Caboche, Michel, and Daniel-Vedele, Françoise

Abstract

We have isolated two Arabidopsis thalianacDNAs by complementation of a yeast gln3 gdh1strain that is affected in the regulation of nitrogen metabolism. The two clones (RGA1and RGA2) are homologous to each other and to the SCARECROW(SCR) gene that is involved in regulating an asymmetric cell division in plants. RGA1, RGA2 and SCR share several structural features and may define a new family of genes. RGA1and RGA2have been mapped, respectively, to chromosome II and I, and their expression in plant is constitutive.

Published
1997
Full Text
View/download PDF

46. Nitrogen modulation of Medicago truncatula resistance to Aphanomyces euteiches depends on plant genotype.

Author

Thalineau E, Fournier C, Gravot A, Wendehenne D, Jeandroz S, and Truong HN

Subjects
Gene Expression Regulation, Plant, Genotype, Nitrates metabolism, Plant Proteins genetics, Aphanomyces pathogenicity, Medicago truncatula metabolism, Medicago truncatula microbiology, Nitrogen metabolism, Plant Proteins metabolism
Abstract

Nitrogen (N) availability can impact plant resistance to pathogens by the regulation of plant immunity. To better understand the links between N nutrition and plant defence, we analysed the impact of N availability on Medicago truncatula resistance to the root pathogen Aphanomyces euteiches. This oomycete is considered to be the most limiting factor for legume production. Ten plant genotypes were tested in vitro for their resistance to A. euteiches in either complete or nitrate-deficient medium. N deficiency led to enhanced or reduced susceptibility depending on the plant genotype. Focusing on four genotypes displaying contrasting responses, we determined the impact of N deficiency on plant growth and shoot N concentration, and performed expression analyses on N- and defence-related genes, as well as the quantification of soluble phenolics and different amino acids in roots. Our analyses suggest that N modulation of plant resistance is not linked to plant response to N deprivation or to mechanisms previously identified to be involved in plant resistance. Furthermore, our studies highlight a role of glutamine in mediating the susceptibility to A. euteiches in M. truncatula., (© 2017 BSPP AND JOHN WILEY & SONS LTD.)

Published
2018
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results