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  1. Article ; Online: Advances in Plant Autophagy.

    Sirko, Agnieszka / Masclaux-Daubresse, Céline

    Cells

    2021  Volume 10, Issue 1

    Abstract: Ubiquitin-proteasome and lysosome-autophagy are the two main cellular degradation systems controlling cellular homeostasis in eukaryotes [ ... ]. ...

    Abstract Ubiquitin-proteasome and lysosome-autophagy are the two main cellular degradation systems controlling cellular homeostasis in eukaryotes [...].
    MeSH term(s) Autophagy/physiology ; Plants/metabolism
    Language English
    Publishing date 2021-01-19
    Publishing country Switzerland
    Document type Editorial ; Research Support, Non-U.S. Gov't
    ZDB-ID 2661518-6
    ISSN 2073-4409 ; 2073-4409
    ISSN (online) 2073-4409
    ISSN 2073-4409
    DOI 10.3390/cells10010194
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Current Understanding of Leaf Senescence in Rice.

    Lee, Sichul / Masclaux-Daubresse, Celine

    International journal of molecular sciences

    2021  Volume 22, Issue 9

    Abstract: Leaf senescence, which is the last developmental phase of plant growth, is controlled by multiple genetic and environmental factors. Leaf yellowing is a visual indicator of senescence due to the loss of the green pigment chlorophyll. During senescence, ... ...

    Abstract Leaf senescence, which is the last developmental phase of plant growth, is controlled by multiple genetic and environmental factors. Leaf yellowing is a visual indicator of senescence due to the loss of the green pigment chlorophyll. During senescence, the methodical disassembly of macromolecules occurs, facilitating nutrient recycling and translocation from the sink to the source organs, which is critical for plant fitness and productivity. Leaf senescence is a complex and tightly regulated process, with coordinated actions of multiple pathways, responding to a sophisticated integration of leaf age and various environmental signals. Many studies have been carried out to understand the leaf senescence-associated molecular mechanisms including the chlorophyll breakdown, phytohormonal and transcriptional regulation, interaction with environmental signals, and associated metabolic changes. The metabolic reprogramming and nutrient recycling occurring during leaf senescence highlight the fundamental role of this developmental stage for the nutrient economy at the whole plant level. The strong impact of the senescence-associated nutrient remobilization on cereal productivity and grain quality is of interest in many breeding programs. This review summarizes our current knowledge in rice on (i) the actors of chlorophyll degradation, (ii) the identification of stay-green genotypes, (iii) the identification of transcription factors involved in the regulation of leaf senescence, (iv) the roles of leaf-senescence-associated nitrogen enzymes on plant performance, and (v) stress-induced senescence. Compiling the different advances obtained on rice leaf senescence will provide a framework for future rice breeding strategies to improve grain yield.
    MeSH term(s) Aging/genetics ; Aging/physiology ; Chlorophyll/metabolism ; Gene Expression Regulation, Plant/genetics ; Genes, Plant/genetics ; Nitrogen/metabolism ; Oryza/genetics ; Oryza/metabolism ; Plant Breeding/methods ; Plant Growth Regulators/metabolism ; Plant Leaves/metabolism ; Plant Proteins/genetics ; Transcription Factors/metabolism
    Chemical Substances Plant Growth Regulators ; Plant Proteins ; Transcription Factors ; Chlorophyll (1406-65-1) ; Nitrogen (N762921K75)
    Language English
    Publishing date 2021-04-26
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms22094515
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  3. Article ; Online: Modulation of plant nitrogen remobilization and postflowering nitrogen uptake under environmental stresses.

    Marmagne, Anne / Masclaux-Daubresse, Céline / Chardon, Fabien

    Journal of plant physiology

    2022  Volume 277, Page(s) 153781

    Abstract: Plants are sessile organisms that take up nitrogen (N) from the soil for growth and development. At the postflowering stage, N that plants require for seed growth and filling derives from either root uptake or shoot remobilization. The balance between N ... ...

    Abstract Plants are sessile organisms that take up nitrogen (N) from the soil for growth and development. At the postflowering stage, N that plants require for seed growth and filling derives from either root uptake or shoot remobilization. The balance between N uptake and N remobilization determines the final carbon (C) and N composition of the seed. The N uptake and N remobilization mechanisms are regulated by endogenous signals, including hormones, developmental stage, and carbon/nitrogen ratio, and by environmental factors. The cellular responses to the environment are relatively well known. However, the effects of environmental stresses on the balance between N uptake and N remobilization are still poorly understood. Thus, this study aims to analyze the impact of environmental stresses (drought, heat, darkness, triggered defense, and low nitrate) on N fluxes within plants during seed filling. Using publicly available Arabidopsis transcriptome data, expression of several marker genes involved in N assimilation, transport, and recycling was analyzed in relation to stress. Results showed that the responses of genes encoding inorganic N transporters, N assimilation, and N recycling are mainly regulated by N limitation, the genes encoding housekeeping proteases are principally sensitive to C limitation, and the response of genes involved in the transport of organic N is controlled by both C and N limitations. In addition,
    MeSH term(s) Arabidopsis/genetics ; Carbon/metabolism ; Hormones/metabolism ; Nitrates/metabolism ; Nitrogen/metabolism ; Peptide Hydrolases/metabolism ; Soil
    Chemical Substances Hormones ; Nitrates ; Soil ; Carbon (7440-44-0) ; Peptide Hydrolases (EC 3.4.-) ; Nitrogen (N762921K75)
    Language English
    Publishing date 2022-07-21
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 283647-6
    ISSN 1618-1328 ; 0176-1617
    ISSN (online) 1618-1328
    ISSN 0176-1617
    DOI 10.1016/j.jplph.2022.153781
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  4. Article: Modulation of plant nitrogen remobilization and postflowering nitrogen uptake under environmental stresses

    Marmagne, Anne / Masclaux-Daubresse, Céline / Chardon, Fabien

    Journal of plant physiology. 2022 July 16,

    2022  

    Abstract: Plants are sessile organisms that take up nitrogen (N) from the soil for growth and development. At the postflowering stage, N that plants require for seed growth and filling derives from either root uptake or shoot remobilization. The balance between N ... ...

    Abstract Plants are sessile organisms that take up nitrogen (N) from the soil for growth and development. At the postflowering stage, N that plants require for seed growth and filling derives from either root uptake or shoot remobilization. The balance between N uptake and N remobilization determines the final carbon (C) and N composition of the seed. The N uptake and N remobilization mechanisms are regulated by endogenous signals, including hormones, developmental stage, and carbon/nitrogen ratio, and by environmental factors. The cellular responses to the environment are relatively well known. However, the effects of environmental stresses on the balance between N uptake and N remobilization are still poorly understood. Thus, this study aims to analyze the impact of environmental stresses (drought, heat, darkness, triggered defense, and low nitrate) on N fluxes within plants during seed filling. Using publicly available Arabidopsis transcriptome data, expression of several marker genes involved in N assimilation, transport, and recycling was analyzed in relation to stress. Results showed that the responses of genes encoding inorganic N transporters, N assimilation, and N recycling are mainly regulated by N limitation, the genes encoding housekeeping proteases are principally sensitive to C limitation, and the response of genes involved in the transport of organic N is controlled by both C and N limitations. In addition, ¹⁵N data were used to examine the effects of severe environmental stresses on N remobilization and N uptake, and a schematic representation of the major factors that regulate the balance between N remobilization and N uptake under the stress and control conditions was provided.
    Keywords Arabidopsis ; carbon ; drought ; growth and development ; heat ; nitrates ; nitrogen ; plant nitrogen content ; proteinases ; seed growth ; soil ; transcriptome
    Language English
    Dates of publication 2022-0716
    Publishing place Elsevier GmbH
    Document type Article
    Note Pre-press version
    ZDB-ID 283647-6
    ISSN 1618-1328 ; 0176-1617
    ISSN (online) 1618-1328
    ISSN 0176-1617
    DOI 10.1016/j.jplph.2022.153781
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Discovery of the biostimulant effect of asparagine and glutamine on plant growth in

    Lardos, Manon / Marmagne, Anne / Bonadé Bottino, Nolwenn / Caris, Quentin / Béal, Bernard / Chardon, Fabien / Masclaux-Daubresse, Céline

    Frontiers in plant science

    2024  Volume 14, Page(s) 1281495

    Abstract: Protein hydrolysates have gained interest as plant biostimulants due to their positive effects on plant performances. They are mainly composed of amino acids, but there is no evidence of the role of individual of amino acids as biostimulants. In this ... ...

    Abstract Protein hydrolysates have gained interest as plant biostimulants due to their positive effects on plant performances. They are mainly composed of amino acids, but there is no evidence of the role of individual of amino acids as biostimulants. In this study we carried out
    Language English
    Publishing date 2024-01-22
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2613694-6
    ISSN 1664-462X
    ISSN 1664-462X
    DOI 10.3389/fpls.2023.1281495
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Multi-omics analyses of sid2 mutant reflect the need of isochorismate synthase ICS1 to cope with sulfur limitation in Arabidopsis thaliana.

    Luo, Jie / Havé, Marien / Soulay, Fabienne / Balliau, Thierry / Clément, Gilles / Tellier, Frédérique / Zivy, Michel / Avice, Jean-Christophe / Masclaux-Daubresse, Céline

    The Plant journal : for cell and molecular biology

    2024  

    Abstract: The SID2 (SA INDUCTION-DEFICIENT2) gene that encodes ICS1 (isochorismate synthase), plays a central role in salicylic acid biosynthesis in Arabidopsis. The sid2 and NahG (encoding a bacterial SA hydroxylase) overexpressing mutants (NahG-OE) have ... ...

    Abstract The SID2 (SA INDUCTION-DEFICIENT2) gene that encodes ICS1 (isochorismate synthase), plays a central role in salicylic acid biosynthesis in Arabidopsis. The sid2 and NahG (encoding a bacterial SA hydroxylase) overexpressing mutants (NahG-OE) have currently been shown to outperform wild type, presenting delayed leaf senescence, higher plant biomass and better seed yield. When grown under sulfate-limited conditions (low-S), sid2 mutants exhibited early leaf yellowing compared to the NahG-OE, the npr1 mutant affected in SA signaling pathway, and WT. This indicated that the hypersensitivity of sid2 to sulfate limitation was independent of the canonical npr1 SA-signaling pathway. Transcriptomic and proteomic analyses revealed that major changes occurred in sid2 when cultivated under low-S, changes that were in good accordance with early senescence phenotype and showed the exacerbation of stress responses. The sid2 mutants displayed a lower sulfate uptake capacity when cultivated under low-S and lower S concentrations in their rosettes. Higher glutathione concentrations in sid2 rosettes under low-S were in good accordance with the higher abundance of proteins involved in glutathione and ascorbate redox metabolism. Amino acid and lipid metabolisms were also strongly modified in sid2 under low-S. Depletion of total fatty acids in sid2 under low-S was consistent with the fact that S-metabolism plays a central role in lipid synthesis. Altogether, our results show that functional ICS1 is important for plants to cope with S limiting conditions.
    Language English
    Publishing date 2024-03-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 1088037-9
    ISSN 1365-313X ; 0960-7412
    ISSN (online) 1365-313X
    ISSN 0960-7412
    DOI 10.1111/tpj.16702
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  7. Article ; Online: Salicylic acid is a key player of Arabidopsis autophagy mutant susceptibility to the necrotrophic bacterium Dickeya dadantii.

    Rigault, Martine / Citerne, Sylvie / Masclaux-Daubresse, Céline / Dellagi, Alia

    Scientific reports

    2021  Volume 11, Issue 1, Page(s) 3624

    Abstract: Autophagy is a ubiquitous vesicular process for protein and organelle recycling in eukaryotes. In plant, autophagy is reported to play pivotal roles in nutrient recycling, adaptation to biotic and abiotic stresses. The role of autophagy in plant immunity ...

    Abstract Autophagy is a ubiquitous vesicular process for protein and organelle recycling in eukaryotes. In plant, autophagy is reported to play pivotal roles in nutrient recycling, adaptation to biotic and abiotic stresses. The role of autophagy in plant immunity remains poorly understood. Several reports showed enhanced susceptibility of different Arabidopsis autophagy mutants (atg) to necrotrophic fungal pathogens. Interaction of necrotrophic bacterial pathogens with autophagy is overlooked. We then investigated such interaction by inoculating the necrotrophic enterobacterium Dickeya dadantii in leaves of the atg2 and atg5 mutants and an ATG8a overexpressing line. Overexpressing ATG8a enhances plant tolerance to D. dadantii. While atg5 mutant displayed similar susceptibility to the WT, the atg2 mutant exhibited accelerated leaf senescence and enhanced susceptibility upon infection. Both phenotypes were reversed when the sid2 mutation, abolishing SA signaling, was introduced in the atg2 mutant. High levels of SA signaling in atg2 mutant resulted in repression of the jasmonic acid (JA) defense pathway known to limit D. dadantii progression in A. thaliana. We provide evidence that in atg2 mutant, the disturbed hormonal balance leading to higher SA signaling is the main factor causing increased susceptibility to the D. dadantii necrotroph by repressing the JA pathway and accelerating developmental senescence.
    MeSH term(s) Arabidopsis/drug effects ; Arabidopsis/genetics ; Arabidopsis/microbiology ; Arabidopsis Proteins/genetics ; Arabidopsis Proteins/metabolism ; Autophagy/drug effects ; Autophagy/genetics ; Dickeya/drug effects ; Dickeya/physiology ; Gene Expression Regulation, Plant/drug effects ; Mutation/genetics ; Plant Diseases/microbiology ; Salicylic Acid/pharmacology ; Signal Transduction ; Up-Regulation/drug effects ; Up-Regulation/genetics
    Chemical Substances Arabidopsis Proteins ; Salicylic Acid (O414PZ4LPZ)
    Language English
    Publishing date 2021-02-11
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-021-83067-6
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  8. Article: Source and sink mechanisms of nitrogen transport and use

    Tegeder, Mechthild / Masclaux‐Daubresse, Céline

    new phytologist. 2018 Jan., v. 217, no. 1

    2018  

    Abstract: Contents Summary 35 I. Introduction 35 II. Nitrogen acquisition and assimilation 36 III. Root‐to‐shoot transport of nitrogen 38 IV. Nitrogen storage pools in vegetative tissues 39 V. Nitrogen transport from source leaf to sink 40 VI. Nitrogen import into ...

    Abstract Contents Summary 35 I. Introduction 35 II. Nitrogen acquisition and assimilation 36 III. Root‐to‐shoot transport of nitrogen 38 IV. Nitrogen storage pools in vegetative tissues 39 V. Nitrogen transport from source leaf to sink 40 VI. Nitrogen import into sinks 42 VII. Relationship between source and sink nitrogen transport processes and metabolism 43 VIII. Regulation of nitrogen transport 43 IX. Strategies for crop improvement 44 X. Conclusions 46 Acknowledgements 47 References 47 SUMMARY: Nitrogen is an essential nutrient for plant growth. World‐wide, large quantities of nitrogenous fertilizer are applied to ensure maximum crop productivity. However, nitrogen fertilizer application is expensive and negatively affects the environment, and subsequently human health. A strategy to address this problem is the development of crops that are efficient in acquiring and using nitrogen and that can achieve high seed yields with reduced nitrogen input. This review integrates the current knowledge regarding inorganic and organic nitrogen management at the whole‐plant level, spanning from nitrogen uptake to remobilization and utilization in source and sink organs. Plant partitioning and transient storage of inorganic and organic nitrogen forms are evaluated, as is how they affect nitrogen availability, metabolism and mobilization. Essential functions of nitrogen transporters in source and sink organs and their importance in regulating nitrogen movement in support of metabolism, and vegetative and reproductive growth are assessed. Finally, we discuss recent advances in plant engineering, demonstrating that nitrogen transporters are effective targets to improve crop productivity and nitrogen use efficiency. While inorganic and organic nitrogen transporters were examined separately in these studies, they provide valuable clues about how to successfully combine approaches for future crop engineering.
    Keywords crops ; engineering ; fertilizer application ; human health ; leaves ; metabolism ; nitrogen ; nitrogen fertilizers ; nutrient use efficiency ; plant growth ; seed yield ; tissues ; transporters
    Language English
    Dates of publication 2018-01
    Size p. 35-53.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note REVIEW
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.14876
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  9. Article ; Online: Source and sink mechanisms of nitrogen transport and use.

    Tegeder, Mechthild / Masclaux-Daubresse, Céline

    The New phytologist

    2017  Volume 217, Issue 1, Page(s) 35–53

    Abstract: Contents Summary 35 I. Introduction 35 II. Nitrogen acquisition and assimilation 36 III. Root-to-shoot transport of nitrogen 38 IV. Nitrogen storage pools in vegetative tissues 39 V. Nitrogen transport from source leaf to sink 40 VI. Nitrogen import into ...

    Abstract Contents Summary 35 I. Introduction 35 II. Nitrogen acquisition and assimilation 36 III. Root-to-shoot transport of nitrogen 38 IV. Nitrogen storage pools in vegetative tissues 39 V. Nitrogen transport from source leaf to sink 40 VI. Nitrogen import into sinks 42 VII. Relationship between source and sink nitrogen transport processes and metabolism 43 VIII. Regulation of nitrogen transport 43 IX. Strategies for crop improvement 44 X. Conclusions 46 Acknowledgements 47 References 47 SUMMARY: Nitrogen is an essential nutrient for plant growth. World-wide, large quantities of nitrogenous fertilizer are applied to ensure maximum crop productivity. However, nitrogen fertilizer application is expensive and negatively affects the environment, and subsequently human health. A strategy to address this problem is the development of crops that are efficient in acquiring and using nitrogen and that can achieve high seed yields with reduced nitrogen input. This review integrates the current knowledge regarding inorganic and organic nitrogen management at the whole-plant level, spanning from nitrogen uptake to remobilization and utilization in source and sink organs. Plant partitioning and transient storage of inorganic and organic nitrogen forms are evaluated, as is how they affect nitrogen availability, metabolism and mobilization. Essential functions of nitrogen transporters in source and sink organs and their importance in regulating nitrogen movement in support of metabolism, and vegetative and reproductive growth are assessed. Finally, we discuss recent advances in plant engineering, demonstrating that nitrogen transporters are effective targets to improve crop productivity and nitrogen use efficiency. While inorganic and organic nitrogen transporters were examined separately in these studies, they provide valuable clues about how to successfully combine approaches for future crop engineering.
    MeSH term(s) Biological Transport ; Crops, Agricultural/growth & development ; Crops, Agricultural/metabolism ; Membrane Transport Proteins/metabolism ; Nitrogen/metabolism ; Plant Leaves/growth & development ; Plant Leaves/metabolism ; Plant Proteins/metabolism ; Plant Roots/growth & development ; Plant Roots/metabolism ; Plant Shoots/growth & development ; Plant Shoots/metabolism ; Seeds/growth & development ; Seeds/metabolism
    Chemical Substances Membrane Transport Proteins ; Plant Proteins ; Nitrogen (N762921K75)
    Language English
    Publishing date 2017-11-09
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.14876
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  10. Article: A proposed role for endomembrane trafficking processes in regulating tonoplast content and vacuole dynamics under ammonium stress conditions in Arabidopsis root cells

    Robert, Germán / Yagyu, Mako / Lascano, Hernán Ramiro / Masclaux-Daubresse, Céline / Yoshimoto, Kohki

    Plant signaling & behavior. 2021 Sept. 02, v. 16, no. 9

    2021  

    Abstract: Ammonium (NH₄ ⁺) stress has multiple effects on plant physiology, therefore, plant responses are complex, and multiple mechanisms are involved in NH₄ ⁺ sensitivity and tolerance in plants. Root growth inhibition is an important quantitative readout of ... ...

    Abstract Ammonium (NH₄ ⁺) stress has multiple effects on plant physiology, therefore, plant responses are complex, and multiple mechanisms are involved in NH₄ ⁺ sensitivity and tolerance in plants. Root growth inhibition is an important quantitative readout of the effects of NH₄ ⁺ stress on plant physiology, and cell elongation appear as the principal growth inhibition target. We recently proposed autophagy as a relevant physiological mechanisms underlying NH₄ ⁺ sensitivity response in Arabidopsis. In a brief overview, the impaired macro-autophagic flux observed under NH₄ ⁺ stress conditions has a detrimental impact on the cellular energetic balance, and therefore on the energy-demanding plant growth. In contrast to its inhibitory effect on the autophagosomes flux to vacuole, NH₄ ⁺ toxicity induced a micro-autophagy-like process. Consistent with the reduced membrane flux to the vacuole related to macro-autophagy inhibition and the increased tonoplast degradation due to enhanced micro-autophagy, the vacuoles of the root cells of the NH₄ ⁺-stressed plants showed lower tonoplast content and a decreased perimeter/area ratio. As the endosome-to-vacuole trafficking is another important process that contributes to membrane flux toward the vacuole, we evaluated the effects of NH₄ ⁺ stress on this process. This allows us to propose that autophagy could contribute to vacuole development as well as possible avenues to follow for future studies.
    Keywords Arabidopsis ; ammonium ; autophagosomes ; behavior ; cell growth ; growth retardation ; macroautophagy ; root growth ; tonoplast ; toxicity ; vacuoles
    Language English
    Dates of publication 2021-0902
    Publishing place Taylor & Francis
    Document type Article
    ISSN 1559-2324
    DOI 10.1080/15592324.2021.1924977
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