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Cho YB, Boyd RA, Ren Y, Lee MS, Jones SI, Ruiz-Vera UM, McGrath JM, Masters MD, Ort DR. Reducing chlorophyll levels in seed-filling stages results in higher seed nitrogen without impacting canopy carbon assimilation. PLANT, CELL & ENVIRONMENT 2024; 47:278-293. [PMID: 37828764 DOI: 10.1111/pce.14737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 09/28/2023] [Accepted: 10/04/2023] [Indexed: 10/14/2023]
Abstract
Chlorophyll is the major light-absorbing pigment for plant photosynthesis. While evolution has been selected for high chlorophyll content in leaves, previous work suggests that domesticated crops grown in modern high-density agricultural environments overinvest in chlorophyll production, thereby lowering light use and nitrogen use efficiency. To investigate the potential benefits of reducing chlorophyll levels, we created ethanol-inducible RNAi tobacco mutants that suppress Mg-chelatase subunit I (CHLI) with small RNA within 3 h of induction and reduce chlorophyll within 5 days in field conditions. We initiated chlorophyll reduction later in plant development to avoid the highly sensitive seedling stage and to allow young plants to have full green leaves to maximise light interception before canopy formation. This study demonstrated that leaf chlorophyll reduction >60% during seed-filling stages increased tobacco seed nitrogen concentration by as much as 17% while canopy photosynthesis, biomass and seed yields were maintained. These results indicate that time-specific reduction of chlorophyll could be a novel strategy that decouples the inverse relationship between yield and seed nitrogen by utilising saved nitrogen from the reduction of chlorophyll while maintaining full carbon assimilation capacity.
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Affiliation(s)
- Young B Cho
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Ryan A Boyd
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Yudong Ren
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Moon-Sub Lee
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Sarah I Jones
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Ursula M Ruiz-Vera
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Justin M McGrath
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Michael D Masters
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Donald R Ort
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
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2
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Baud S, Corso M, Debeaujon I, Dubreucq B, Job D, Marion-Poll A, Miquel M, North H, Rajjou L, Lepiniec L. Recent progress in molecular genetics and omics-driven research in seed biology. C R Biol 2023; 345:61-110. [PMID: 36847120 DOI: 10.5802/crbiol.104] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 12/07/2022] [Indexed: 01/11/2023]
Abstract
Elucidating the mechanisms that control seed development, metabolism, and physiology is a fundamental issue in biology. Michel Caboche had long been a catalyst for seed biology research in France up until his untimely passing away last year. To honour his memory, we have updated a review written under his coordination in 2010 entitled "Arabidopsis seed secrets unravelled after a decade of genetic and omics-driven research". This review encompassed different molecular aspects of seed development, reserve accumulation, dormancy and germination, that are studied in the lab created by M. Caboche. We have extended the scope of this review to highlight original experimental approaches implemented in the field over the past decade such as omics approaches aimed at investigating the control of gene expression, protein modifications, primary and specialized metabolites at the tissue or even cellular level, as well as seed biodiversity and the impact of the environment on seed quality.
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3
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Bashir SS, Siddiqi TO, Kumar D, Ahmad A. Physio-biochemical, agronomical, and gene expression analysis reveals different responsive approach to low nitrogen in contrasting rice cultivars for nitrogen use efficiency. Mol Biol Rep 2023; 50:1575-1593. [PMID: 36520360 DOI: 10.1007/s11033-022-08160-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 11/24/2022] [Indexed: 12/23/2022]
Abstract
BACKGROUND Nitrogen (N) is an essential macronutrient for plant growth and development as it is an essential constituent of biomolecules. Its availability directly impacts crop yield. Increased N application in crop fields has caused environmental and health problems, and decreasing nitrogen inputs are in demand to maintain crop production sustainability. Understanding the molecular mechanism of N utilization could play a crucial role in improving the nitrogen use efficiency (NUE) of crop plants. METHODS AND RESULTS In the present study, the effect of low N supply on plant growth, physio-biochemical, chlorophyll fluorescence attributes, yield components, and gene expression analysis were measured at six developmental stages in rice cultivars. Two rice cultivars were grown with a supply of optimium (120 kg ha-1) and low N (60 kg ha-1). Cultivar Vikramarya excelled Aditya at low N supply, and exhibits enhanced plant growth, physiological efficiency, agronomic efficiency, and improved NUE due to higher N uptake and utilization at low N treatment. Moreover, plant biomass, leaf area, and photosynthetic rate were significantly higher in cv. Vikramarya than cv. Aditya at different growth stages, under low N treatment. In addition, enzymatic activities in cultivar Vikramarya were higher than cultivar Aditya under low nitrogen, indicating its greater potential for N metabolism. Gene expression analysis was carried out for the most important nitrogen assimilatory enzymes, such as nitrate reductase (NR), nitrite reductase (NiR), glutamine synthetase (GS), and glutamate synthase (GOGAT). Expression levels of these genes at different growth stages were significantly higher in cv. Vikramarya compared to cv. Aditya at low N supply. Our findings suggest that improving NUE needs specific revision in N metabolism and physiological assimilation. CONCLUSION Overall differences in plant growth, physiological efficiency, biochemical activities, and expression levels of N metabolism genes in N-efficient and N-inefficient rice cultivars need a specific adaptation to N metabolism. Regulatory genes may separately or in conjunction, enhance the NUE. These results provide a platform for selecting crop cultivars for nitrogen utilization efficiency at low N treatment.
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Affiliation(s)
- Sheikh Shanawaz Bashir
- Department of Botany, School of Chemical and Life Sciences, Jamia Hamdard, New Delhi, India
| | - Tariq Omar Siddiqi
- Department of Botany, School of Chemical and Life Sciences, Jamia Hamdard, New Delhi, India
| | - Dinesh Kumar
- Division of Agronomy, Indian Agricultural Research Institute, New Delhi, India
| | - Altaf Ahmad
- Department of Botany, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, India.
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4
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Lin ZH, Chen CS, Zhao SQ, Liu Y, Zhong QS, Ruan QC, Chen ZH, You XM, Shan RY, Li XL, Zhang YZ. Molecular and physiological mechanisms of tea (Camellia sinensis (L.) O. Kuntze) leaf and root in response to nitrogen deficiency. BMC Genomics 2023; 24:27. [PMID: 36650452 PMCID: PMC9847173 DOI: 10.1186/s12864-023-09112-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 01/03/2023] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND As an economically important crop, tea is strongly nitrogen (N)-dependent. However, the physiological and molecular mechanisms underlying the response of N deficiency in tea are not fully understood. Tea cultivar "Chunlv2" [Camellia sinensis (L.) O. Kuntze] were cultured with a nutrient solution with 0 mM [N-deficiency] or 3 mM (Control) NH4NO3 in 6 L pottery pots containing clean river sands. RESULTS N deficiency significantly decreased N content, dry weight, chlorophyll (Chl) content, L-theanine and the activities of N metabolism-related enzymes, but increased the content of total flavonoids and polyphenols in tea leaves. N deficiency delayed the sprouting time of tea buds. By using the RNA-seq technique and subsequent bioinformatics analysis, 3050 up-regulated and 2688 down-regulated differentially expressed genes (DEGs) were isolated in tea leaves in response to N deficiency. However, only 1025 genes were up-regulated and 744 down-regulated in roots. Gene ontology (GO) term enrichment analysis showed that 205 DEGs in tea leaves were enriched in seven GO terms and 152 DEGs in tea roots were enriched in 11 GO items based on P < 0.05. In tea leaves, most GO-enriched DEGs were involved in chlorophyll a/b binding activities, photosynthetic performance, and transport activities. But most of the DEGs in tea roots were involved in the metabolism of carbohydrates and plant hormones with regard to the GO terms of biological processes. N deficiency significantly increased the expression level of phosphate transporter genes, which indicated that N deficiency might impair phosphorus metabolism in tea leaves. Furthermore, some DEGs, such as probable anion transporter 3 and high-affinity nitrate transporter 2.7, might be of great potential in improving the tolerance of N deficiency in tea plants and further study could work on this area in the future. CONCLUSIONS Our results indicated N deficiency inhibited the growth of tea plant, which might be due to altered N metabolism and expression levels of DEGs involved in the photosynthetic performance, transport activity and oxidation-reduction processes.
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Affiliation(s)
- Zheng-He Lin
- grid.418033.d0000 0001 2229 4212Tea Research Institute, Fujian Academy of Agricultural Sciences, Fu’an, 355000 China
| | - Chang-Song Chen
- grid.418033.d0000 0001 2229 4212Tea Research Institute, Fujian Academy of Agricultural Sciences, Fu’an, 355000 China
| | - Shui-Qing Zhao
- Laixi Bureau of Agriculture and Rural Affairs of Shandong Province, Laixi, 266699 China
| | - Yuan Liu
- Laixi Bureau of Agriculture and Rural Affairs of Shandong Province, Laixi, 266699 China
| | - Qiu-Sheng Zhong
- grid.418033.d0000 0001 2229 4212Tea Research Institute, Fujian Academy of Agricultural Sciences, Fu’an, 355000 China
| | - Qi-Chun Ruan
- grid.418033.d0000 0001 2229 4212Tea Research Institute, Fujian Academy of Agricultural Sciences, Fu’an, 355000 China
| | - Zhi-Hui Chen
- grid.418033.d0000 0001 2229 4212Tea Research Institute, Fujian Academy of Agricultural Sciences, Fu’an, 355000 China
| | - Xiao-Mei You
- grid.418033.d0000 0001 2229 4212Tea Research Institute, Fujian Academy of Agricultural Sciences, Fu’an, 355000 China
| | - Rui-Yang Shan
- grid.418033.d0000 0001 2229 4212Tea Research Institute, Fujian Academy of Agricultural Sciences, Fu’an, 355000 China
| | - Xin-Lei Li
- grid.418033.d0000 0001 2229 4212Tea Research Institute, Fujian Academy of Agricultural Sciences, Fu’an, 355000 China
| | - Ya-Zhen Zhang
- grid.418033.d0000 0001 2229 4212Tea Research Institute, Fujian Academy of Agricultural Sciences, Fu’an, 355000 China
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5
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Burgess AJ, Masclaux‐Daubresse C, Strittmatter G, Weber APM, Taylor SH, Harbinson J, Yin X, Long S, Paul MJ, Westhoff P, Loreto F, Ceriotti A, Saltenis VLR, Pribil M, Nacry P, Scharff LB, Jensen PE, Muller B, Cohan J, Foulkes J, Rogowsky P, Debaeke P, Meyer C, Nelissen H, Inzé D, Klein Lankhorst R, Parry MAJ, Murchie EH, Baekelandt A. Improving crop yield potential: Underlying biological processes and future prospects. Food Energy Secur 2022; 12:e435. [PMID: 37035025 PMCID: PMC10078444 DOI: 10.1002/fes3.435] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 10/07/2022] [Accepted: 11/10/2022] [Indexed: 12/05/2022] Open
Abstract
The growing world population and global increases in the standard of living both result in an increasing demand for food, feed and other plant-derived products. In the coming years, plant-based research will be among the major drivers ensuring food security and the expansion of the bio-based economy. Crop productivity is determined by several factors, including the available physical and agricultural resources, crop management, and the resource use efficiency, quality and intrinsic yield potential of the chosen crop. This review focuses on intrinsic yield potential, since understanding its determinants and their biological basis will allow to maximize the plant's potential in food and energy production. Yield potential is determined by a variety of complex traits that integrate strictly regulated processes and their underlying gene regulatory networks. Due to this inherent complexity, numerous potential targets have been identified that could be exploited to increase crop yield. These encompass diverse metabolic and physical processes at the cellular, organ and canopy level. We present an overview of some of the distinct biological processes considered to be crucial for yield determination that could further be exploited to improve future crop productivity.
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Affiliation(s)
- Alexandra J. Burgess
- School of Biosciences University of Nottingham, Sutton Bonington campus Loughborough UK
| | | | - Günter Strittmatter
- Institute of Plant Biochemistry, Cluster of Excellence on Plant Sciences (CEPLAS) Heinrich‐Heine‐Universität Düsseldorf Düsseldorf Germany
| | - Andreas P. M. Weber
- Institute of Plant Biochemistry, Cluster of Excellence on Plant Sciences (CEPLAS) Heinrich‐Heine‐Universität Düsseldorf Düsseldorf Germany
| | | | - Jeremy Harbinson
- Laboratory for Biophysics Wageningen University and Research Wageningen The Netherlands
| | - Xinyou Yin
- Centre for Crop Systems Analysis, Department of Plant Sciences Wageningen University & Research Wageningen The Netherlands
| | - Stephen Long
- Lancaster Environment Centre Lancaster University Lancaster UK
- Plant Biology and Crop Sciences University of Illinois at Urbana‐Champaign Urbana Illinois USA
| | | | - Peter Westhoff
- Institute of Plant Biochemistry, Cluster of Excellence on Plant Sciences (CEPLAS) Heinrich‐Heine‐Universität Düsseldorf Düsseldorf Germany
| | - Francesco Loreto
- Department of Biology, Agriculture and Food Sciences, National Research Council of Italy (CNR), Rome, Italy and University of Naples Federico II Napoli Italy
| | - Aldo Ceriotti
- Institute of Agricultural Biology and Biotechnology National Research Council (CNR) Milan Italy
| | - Vandasue L. R. Saltenis
- Copenhagen Plant Science Centre, Department of Plant and Environmental Sciences University of Copenhagen Copenhagen Denmark
| | - Mathias Pribil
- Copenhagen Plant Science Centre, Department of Plant and Environmental Sciences University of Copenhagen Copenhagen Denmark
| | - Philippe Nacry
- BPMP, Univ Montpellier, INRAE, CNRS Institut Agro Montpellier France
| | - Lars B. Scharff
- Copenhagen Plant Science Centre, Department of Plant and Environmental Sciences University of Copenhagen Copenhagen Denmark
| | - Poul Erik Jensen
- Department of Food Science University of Copenhagen Copenhagen Denmark
| | - Bertrand Muller
- Université de Montpellier ‐ LEPSE – INRAE Institut Agro Montpellier France
| | | | - John Foulkes
- School of Biosciences University of Nottingham, Sutton Bonington campus Loughborough UK
| | - Peter Rogowsky
- INRAE UMR Plant Reproduction and Development Lyon France
| | | | - Christian Meyer
- IJPB UMR1318 INRAE‐AgroParisTech‐Université Paris Saclay Versailles France
| | - Hilde Nelissen
- Department of Plant Biotechnology and Bioinformatics Ghent University Ghent Belgium
- VIB Center for Plant Systems Biology Ghent Belgium
| | - Dirk Inzé
- Department of Plant Biotechnology and Bioinformatics Ghent University Ghent Belgium
- VIB Center for Plant Systems Biology Ghent Belgium
| | - René Klein Lankhorst
- Wageningen Plant Research Wageningen University & Research Wageningen The Netherlands
| | | | - Erik H. Murchie
- School of Biosciences University of Nottingham, Sutton Bonington campus Loughborough UK
| | - Alexandra Baekelandt
- Department of Plant Biotechnology and Bioinformatics Ghent University Ghent Belgium
- VIB Center for Plant Systems Biology Ghent Belgium
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6
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Marmagne A, Masclaux-Daubresse C, Chardon F. Modulation of plant nitrogen remobilization and postflowering nitrogen uptake under environmental stresses. JOURNAL OF PLANT PHYSIOLOGY 2022; 277:153781. [PMID: 36029571 DOI: 10.1016/j.jplph.2022.153781] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 07/16/2022] [Accepted: 07/16/2022] [Indexed: 06/15/2023]
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.
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Affiliation(s)
- Anne Marmagne
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000, Versailles, France
| | - Céline Masclaux-Daubresse
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000, Versailles, France
| | - Fabien Chardon
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000, Versailles, France.
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7
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Chattha MS, Ali Q, Haroon M, Afzal MJ, Javed T, Hussain S, Mahmood T, Solanki MK, Umar A, Abbas W, Nasar S, Schwartz-Lazaro LM, Zhou L. Enhancement of nitrogen use efficiency through agronomic and molecular based approaches in cotton. FRONTIERS IN PLANT SCIENCE 2022; 13:994306. [PMID: 36237509 PMCID: PMC9552886 DOI: 10.3389/fpls.2022.994306] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Accepted: 08/22/2022] [Indexed: 05/22/2023]
Abstract
Cotton is a major fiber crop grown worldwide. Nitrogen (N) is an essential nutrient for cotton production and supports efficient crop production. It is a crucial nutrient that is required more than any other. Nitrogen management is a daunting task for plants; thus, various strategies, individually and collectively, have been adopted to improve its efficacy. The negative environmental impacts of excessive N application on cotton production have become harmful to consumers and growers. The 4R's of nutrient stewardship (right product, right rate, right time, and right place) is a newly developed agronomic practice that provides a solid foundation for achieving nitrogen use efficiency (NUE) in cotton production. Cropping systems are equally crucial for increasing production, profitability, environmental growth protection, and sustainability. This concept incorporates the right fertilizer source at the right rate, time, and place. In addition to agronomic practices, molecular approaches are equally important for improving cotton NUE. This could be achieved by increasing the efficacy of metabolic pathways at the cellular, organ, and structural levels and NUE-regulating enzymes and genes. This is a potential method to improve the role of N transporters in plants, resulting in better utilization and remobilization of N in cotton plants. Therefore, we suggest effective methods for accelerating NUE in cotton. This review aims to provide a detailed overview of agronomic and molecular approaches for improving NUE in cotton production, which benefits both the environment and growers.
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Affiliation(s)
- Muhammad Sohaib Chattha
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Institute of Agro-Product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
- School of Plant, Environmental and Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA, United States
| | - Qurban Ali
- Laboratory of Integrated Management of Crop Diseases and Pests, Department of Plant Pathology, College of Plant Protection, Ministry of Education, Nanjing Agricultural University, Nanjing, China
| | - Muhammad Haroon
- National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, China
| | | | - Talha Javed
- College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Sadam Hussain
- Department of Agronomy, University of Agriculture Faisalabad, Faisalabad, Pakistan
| | - Tahir Mahmood
- Department of Plant Breeding & Genetics, Pir Mehr Ali Shah Arid Agriculture University, Rawalpindi, Pakistan
| | - Manoj K. Solanki
- Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Katowice, Poland
| | - Aisha Umar
- Institute of Botany, University of the Punjab, Lahore, Pakistan
| | - Waseem Abbas
- National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, China
| | - Shanza Nasar
- Department of Botany, University of Gujrat Hafiz Hayat Campus, Gujrat, Pakistan
| | - Lauren M. Schwartz-Lazaro
- School of Plant, Environmental and Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA, United States
| | - Lei Zhou
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Institute of Agro-Product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
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8
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Yu P, Hua Z. The ubiquitin-26S proteasome system and autophagy relay proteome homeostasis regulation during silique development. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2022; 111:1324-1339. [PMID: 35780489 PMCID: PMC9545597 DOI: 10.1111/tpj.15891] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 06/20/2022] [Accepted: 06/28/2022] [Indexed: 05/26/2023]
Abstract
Functional studies of the ubiquitin-26S proteasome system (UPS) have demonstrated that virtually all aspects of the plant's life involve UPS-mediated turnover of abnormal or short-lived proteins. However, the role of the UPS during development, including in seeds and fruits, remains to be determined in detail, although mutants of several of its core elements are known to be embryonically lethal. Unfortunately, early termination of embryogenesis limits the possibility to characterize the activities of the UPS in reproductive organs. Given both the economic and the societal impact of reproductive production, such studies are indispensable. Here, we systematically compared expression of multiple 26S proteasome subunits along with the dynamics of proteasome activity and total protein ubiquitylation in seedlings, developing siliques, and embryos of Arabidopsis thaliana. Since autophagy plays the second largest role in maintaining proteome stability, we parallelly studied three rate-limiting enzymes that are involved in autophagy flux. Our experiments unexpectedly discovered that, in contrast to the activities in seedlings, both protein and transcript levels of six selected 26S proteasome subunits gradually decline in immature siliques or embryos toward maturation while the autophagy flux rises despite the nutrient-rich condition. We also discovered a reciprocal turnover pathway between the proteasome and autophagy. While the autophagy flux is suppressed in seedlings by UPS-mediated degradation of its three key enzymes, transcriptional reprogramming dampens this process in siliques, which in turn stimulates a bulk autophagic degradation of proteasomes. Collectively, our study of the developmental changes of the UPS and autophagy activities suggests that they relay the proteome homeostasis regulation in early silique and/or seed development, highlighting their interactions during development.
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Affiliation(s)
- Peifeng Yu
- Department of Environmental and Plant BiologyOhio UniversityAthensOhio45701USA
- Interdisciplinary Program in Molecular and Cellular BiologyOhio UniversityAthensOhio45701USA
| | - Zhihua Hua
- Department of Environmental and Plant BiologyOhio UniversityAthensOhio45701USA
- Interdisciplinary Program in Molecular and Cellular BiologyOhio UniversityAthensOhio45701USA
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9
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The Pyla-1 Natural Accession of Arabidopsis thaliana Shows Little Nitrate-Induced Plasticity of Root Development. NITROGEN 2022. [DOI: 10.3390/nitrogen3030029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Optimizing root system architecture is a strategy for coping with soil fertility, such as low nitrogen input. An ample number of Arabidopsis thaliana natural accessions have set the foundation for studies on mechanisms that regulate root morphology. This report compares the Columbia-0 (Col-0) reference and Pyla-1 (Pyl-1) from a coastal zone in France, known for having the tallest sand dune in Europe. Seedlings were grown on vertical agar plates with different nitrate concentrations. The lateral root outgrowth of Col-0 was stimulated under mild depletion and repressed under nitrate enrichment. The Pyl-1 produced a long primary root and any or very few visible lateral roots across the nitrate supplies. This could reflect an adaptation to sandy soil conditions, where the primary root grows downwards to the lower strata to take up water and mobile soil resources without elongating the lateral roots. Microscopic observations revealed similar densities of lateral root primordia in both accessions. The Pyl-1 maintained the ability to initiate lateral root primordia. However, the post-initiation events seemed to be critical in modulating the lateral-root-less phenotype. In Pyl-1, the emergence of primordia through the primary root tissues was slowed, and newly formed lateral roots stayed stunted. In brief, Pyl-1 is a fascinating genotype for studying the nutritional influences on lateral root development.
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10
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Tantray AY, Hazzazi Y, Ahmad A. Physiological, Agronomical, and Proteomic Studies Reveal Crucial Players in Rice Nitrogen Use Efficiency under Low Nitrogen Supply. Int J Mol Sci 2022; 23:6410. [PMID: 35742855 PMCID: PMC9224494 DOI: 10.3390/ijms23126410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Revised: 06/03/2022] [Accepted: 06/06/2022] [Indexed: 11/26/2022] Open
Abstract
Excessive use of nitrogenous fertilizers to enhance rice productivity has become a significant source of nitrogen (N) pollution and reduced sustainable agriculture. However, little information about the physiology of different growth stages, agronomic traits, and associated genetic bases of N use efficiency (NUE) are available at low-N supply. Two rice (Oryza sativa L.) cultivars were grown with optimum N (120 kg ha-1) and low N (60 kg ha-1) supply. Six growth stages were analyzed to measure the growth and physiological traits, as well as the differential proteomic profiles, of the rice cultivars. Cultivar Panvel outclassed Nagina 22 at low-N supply and exhibited improved growth and physiology at most of the growth stages and agronomic efficiency due to higher N uptake and utilization at low-N supply. On average, photosynthetic rate, chlorophyll content, plant biomass, leaf N content, and grain yield were decreased in cultivar Nagina 22 than Panvel was 8%, 11%, 21%, 19%, and 22%, respectively, under low-N supply. Furthermore, proteome analyses revealed that many proteins were upregulated and downregulated at the different growth stages under low-N supply. These proteins are associated with N and carbon metabolism and other physiological processes. This supports the genotypic differences in photosynthesis, N assimilation, energy stabilization, and rice-protein yield. Our study suggests that enhancing NUE at low-N supply demands distinct modifications in N metabolism and physiological assimilation. The NUE may be regulated by key identified differentially expressed proteins. These proteins might be the targets for improving crop NUE at low-N supply.
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Affiliation(s)
- Aadil Yousuf Tantray
- Department of Botany, Aligarh Muslim University, Aligarh 202002, Uttar Pradesh, India;
| | - Yehia Hazzazi
- School of Biological Sciences, University of Aberdeen, Aberdeen AB24 3UU, UK;
- Biology Department, Faculty of Sciences, Jazan University, Jazan 45142, Saudi Arabia
| | - Altaf Ahmad
- Department of Botany, Aligarh Muslim University, Aligarh 202002, Uttar Pradesh, India;
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11
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De Pessemier J, Moturu TR, Nacry P, Ebert R, De Gernier H, Tillard P, Swarup K, Wells DM, Haseloff J, Murray SC, Bennett MJ, Inzé D, Vincent CI, Hermans C. Root system size and root hair length are key phenes for nitrate acquisition and biomass production across natural variation in Arabidopsis. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:3569-3583. [PMID: 35304891 DOI: 10.1093/jxb/erac118] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 03/17/2022] [Indexed: 06/14/2023]
Abstract
The role of root phenes in nitrogen (N) acquisition and biomass production was evaluated in 10 contrasting natural accessions of Arabidopsis thaliana L. Seedlings were grown on vertical agar plates with two different nitrate supplies. The low N treatment increased the root to shoot biomass ratio and promoted the proliferation of lateral roots and root hairs. The cost of a larger root system did not impact shoot biomass. Greater biomass production could be achieved through increased root length or through specific root hair characteristics. A greater number of root hairs may provide a low-resistance pathway under elevated N conditions, while root hair length may enhance root zone exploration under low N conditions. The variability of N uptake and the expression levels of genes encoding nitrate transporters were measured. A positive correlation was found between root system size and high-affinity nitrate uptake, emphasizing the benefits of an exploratory root organ in N acquisition. The expression levels of NRT1.2/NPF4.6, NRT2.2, and NRT1.5/NPF7.3 negatively correlated with some root morphological traits. Such basic knowledge in Arabidopsis demonstrates the importance of root phenes to improve N acquisition and paves the way to design eudicot ideotypes.
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Affiliation(s)
- Jérôme De Pessemier
- Crop Production and Biostimulation Laboratory, Interfacultary School of Bioengineers, Université libre de Bruxelles, B-1050 Brussels, Belgium
| | - Taraka Ramji Moturu
- Crop Production and Biostimulation Laboratory, Interfacultary School of Bioengineers, Université libre de Bruxelles, B-1050 Brussels, Belgium
| | - Philippe Nacry
- Institute of Plant Science Montpellier, Université de Montpellier, CNRS, INRAE, Institut Agro, 34060 Montpellier, France
| | - Rebecca Ebert
- Citrus Research and Education Center, Horticultural Sciences Department, Institute of Food and Agricultural Sciences, University of Florida, Lake Alfred, FL, USA
| | - Hugues De Gernier
- Crop Production and Biostimulation Laboratory, Interfacultary School of Bioengineers, Université libre de Bruxelles, B-1050 Brussels, Belgium
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
- VIB Center for Plant Systems Biology, 9052 Ghent, Belgium
| | - Pascal Tillard
- Institute of Plant Science Montpellier, Université de Montpellier, CNRS, INRAE, Institut Agro, 34060 Montpellier, France
| | - Kamal Swarup
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, UK
| | - Darren M Wells
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, UK
| | - Jim Haseloff
- Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, UK
| | - Seth C Murray
- Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843, USA
| | - Malcolm J Bennett
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, UK
| | - Dirk Inzé
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
- VIB Center for Plant Systems Biology, 9052 Ghent, Belgium
| | - Christopher I Vincent
- Citrus Research and Education Center, Horticultural Sciences Department, Institute of Food and Agricultural Sciences, University of Florida, Lake Alfred, FL, USA
| | - Christian Hermans
- Crop Production and Biostimulation Laboratory, Interfacultary School of Bioengineers, Université libre de Bruxelles, B-1050 Brussels, Belgium
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12
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Chardon F, De Marco F, Marmagne A, Le Hir R, Vilaine F, Bellini C, Dinant S. Natural variation in the long-distance transport of nutrients and photoassimilates in response to N availability. JOURNAL OF PLANT PHYSIOLOGY 2022; 273:153707. [PMID: 35550522 DOI: 10.1016/j.jplph.2022.153707] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 03/31/2022] [Accepted: 04/19/2022] [Indexed: 06/15/2023]
Abstract
Phloem and xylem tissues are necessary for the allocation of nutrients and photoassimilates. However, how the long-distance transport of carbon (C) and nitrogen (N) is coordinated with the central metabolism is largely unknown. To better understand how the genetic and environmental factors influence C and N transport, we analysed the metabolite profiles of phloem exudates and xylem saps of five Arabidopsis thaliana accessions grown in low or non-limiting N supply. We observed that xylem saps were composed of 46 or 56% carbohydrates, 27 or 45% amino acids, and 5 or 13% organic acids in low or non-limiting N supply, respectively. In contrast, phloem exudates were composed of 76 or 86% carbohydrates, 7 or 18% amino acids, and 5 or 6% organic acids. Variation in N supply impacted amino acid, organic acid and sugar contents. When comparing low N and non-limiting N, the most striking differences were variations of glutamine, aspartate, and succinate abundance in the xylem saps and citrate and fumarate abundance in phloem exudates. In addition, we observed a substantial variation of metabolite content between genotypes, particularly under high N. The content of several organic acids, such as malate, citrate, fumarate, and succinate was affected by the genotype alone or by the interaction between genotype and N supply. This study confirmed that the response of the transport of nutrients in the phloem and the xylem to N availability is associated with the regulation of the central metabolism and could be an adaptive trait.
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Affiliation(s)
- Fabien Chardon
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000, Versailles, France
| | - Federica De Marco
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000, Versailles, France
| | - Anne Marmagne
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000, Versailles, France
| | - Rozenn Le Hir
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000, Versailles, France
| | - Françoise Vilaine
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000, Versailles, France
| | - Catherine Bellini
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000, Versailles, France; Umeå Plant Science Centre (UPSC), Department of Plant Physiology, Umeå University, 901 87, Umeå, Sweden
| | - Sylvie Dinant
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), 78000, Versailles, France.
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Huang W, Ma D, Hao X, Li J, Xia L, Zhang E, Wang P, Wang M, Guo F, Wang Y, Ni D, Zhao H. CsATG101 Delays Growth and Accelerates Senescence Response to Low Nitrogen Stress in Arabidopsis thaliana. FRONTIERS IN PLANT SCIENCE 2022; 13:880095. [PMID: 35620698 PMCID: PMC9127664 DOI: 10.3389/fpls.2022.880095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 03/28/2022] [Indexed: 06/15/2023]
Abstract
For tea plants, nitrogen (N) is a foundational element and large quantities of N are required during periods of roundly vigorous growth. However, the fluctuation of N in the tea garden could not always meet the dynamic demand of the tea plants. Autophagy, an intracellular degradation process for materials recycling in eukaryotes, plays an important role in nutrient remobilization upon stressful conditions and leaf senescence. Studies have proven that numerous autophagy-related genes (ATGs) are involved in N utilization efficiency in Arabidopsis thaliana and other species. Here, we identified an ATG gene, CsATG101, and characterized the potential functions in response to N in A. thaliana. The expression patterns of CsATG101 in four categories of aging gradient leaves among 24 tea cultivars indicated that autophagy mainly occurred in mature leaves at a relatively high level. Further, the in planta heterologous expression of CsATG101 in A. thaliana was employed to investigate the response of CsATG101 to low N stress. The results illustrated a delayed transition from vegetative to reproductive growth under normal N conditions, while premature senescence under N deficient conditions in transgenic plants vs. the wild type. The expression profiles of 12 AtATGs confirmed the autophagy process, especially in mature leaves of transgenic plants. Also, the relatively high expression levels for AtAAP1, AtLHT1, AtGLN1;1, and AtNIA1 in mature leaves illustrated that the mature leaves act as the source leaves in transgenic plants. Altogether, the findings demonstrated that CsATG101 is a candidate gene for improving annual fresh tea leaves yield under both deficient and sufficient N conditions via the autophagy process.
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Affiliation(s)
- Wei Huang
- Key Laboratory of Horticultural Plant Biology of Ministry of Education, Huazhong Agricultural University, Wuhan, China
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Danni Ma
- Key Laboratory of Horticultural Plant Biology of Ministry of Education, Huazhong Agricultural University, Wuhan, China
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Xulei Hao
- Key Laboratory of Horticultural Plant Biology of Ministry of Education, Huazhong Agricultural University, Wuhan, China
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Jia Li
- Key Laboratory of Horticultural Plant Biology of Ministry of Education, Huazhong Agricultural University, Wuhan, China
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Li Xia
- Key Laboratory of Horticultural Plant Biology of Ministry of Education, Huazhong Agricultural University, Wuhan, China
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - E. Zhang
- Key Laboratory of Horticultural Plant Biology of Ministry of Education, Huazhong Agricultural University, Wuhan, China
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Pu Wang
- Key Laboratory of Horticultural Plant Biology of Ministry of Education, Huazhong Agricultural University, Wuhan, China
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Mingle Wang
- Key Laboratory of Horticultural Plant Biology of Ministry of Education, Huazhong Agricultural University, Wuhan, China
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Fei Guo
- Key Laboratory of Horticultural Plant Biology of Ministry of Education, Huazhong Agricultural University, Wuhan, China
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Yu Wang
- Key Laboratory of Horticultural Plant Biology of Ministry of Education, Huazhong Agricultural University, Wuhan, China
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Dejiang Ni
- Key Laboratory of Horticultural Plant Biology of Ministry of Education, Huazhong Agricultural University, Wuhan, China
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Hua Zhao
- Key Laboratory of Horticultural Plant Biology of Ministry of Education, Huazhong Agricultural University, Wuhan, China
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
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14
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Magen S, Seybold H, Laloum D, Avin-Wittenberg T. Metabolism and autophagy in plants - A perfect match. FEBS Lett 2022; 596:2133-2151. [PMID: 35470431 DOI: 10.1002/1873-3468.14359] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 04/19/2022] [Accepted: 04/20/2022] [Indexed: 01/18/2023]
Abstract
Autophagy is a eukaryotic cellular transport mechanism that delivers intracellular macromolecules, proteins, and even organelles to a lytic organelle (vacuole in yeast and plants/lysosome in animals) for degradation and nutrient recycling. The process is mediated by highly conserved Autophagy-Related (ATG) proteins. In plants, autophagy maintains cellular homeostasis under favorable conditions, guaranteeing normal plant growth and fitness. Severe stress such as nutrient starvation and plant senescence further induce it, thus ensuring plant survival under unfavorable conditions by providing nutrients through the removal of damaged or aged proteins, or organelles. In this article, we examine the interplay between metabolism and autophagy, focusing on the different aspects of this reciprocal relationship. We show that autophagy has a strong influence on a range of metabolic processes, whereas, at the same time, even single metabolites can activate autophagy. We highlight the involvement of ATG genes in metabolism, examine the role of the macronutrients carbon and nitrogen, as well as various micronutrients, and take a closer look at how the interaction between autophagy and metabolism impacts on plant phenotypes and yield.
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Affiliation(s)
- Sahar Magen
- Department of Plant and Environmental Sciences, Alexander Silberman Institute of Life Sciences, the Hebrew University of Jerusalem, Israel
| | - Heike Seybold
- Department of Plant and Environmental Sciences, Alexander Silberman Institute of Life Sciences, the Hebrew University of Jerusalem, Israel
| | - Daniel Laloum
- Department of Plant and Environmental Sciences, Alexander Silberman Institute of Life Sciences, the Hebrew University of Jerusalem, Israel
| | - Tamar Avin-Wittenberg
- Department of Plant and Environmental Sciences, Alexander Silberman Institute of Life Sciences, the Hebrew University of Jerusalem, Israel
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15
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Effah Z, Li L, Xie J, Karikari B, Wang J, Zeng M, Wang L, Boamah S, Padma Shanthi J. Post-anthesis Relationships Between Nitrogen Isotope Discrimination and Yield of Spring Wheat Under Different Nitrogen Levels. FRONTIERS IN PLANT SCIENCE 2022; 13:859655. [PMID: 35371181 PMCID: PMC8971053 DOI: 10.3389/fpls.2022.859655] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 02/21/2022] [Indexed: 06/14/2023]
Abstract
Wheat grain yield and nitrogen (N) content are influenced by the amount of N remobilized to the grain, together with pre-anthesis and post-anthesis N uptake. Isotopic techniques in farmed areas may provide insight into the mechanism underlying the N cycle. 15N-labeled urea was applied to microplots within five different fertilized treatments 0 kg ha-1 (N1), 52.5 kg ha-1 (N2), 105 kg ha-1 (N3), 157.5 kg ha-1 (N4), and 210 kg ha-1 (N5) of a long-term field trial (2003-2021) in a rainfed wheat field in the semi-arid loess Plateau, China, to determine post-anthesis N uptake and remobilization into the grain, as well as the variability of 15N enrichment in aboveground parts. Total N uptake was between 7.88 and 29.27 kg ha-1 for straw and 41.85 and 95.27 kg ha-1 for grain. In comparison to N1, N fertilization increased straw and grain N uptake by 73.1 and 56.1%, respectively. Nitrogen use efficiency (NUE) and harvest index were altered by N application rates. The average NUE at maturity was 19.9% in 2020 and 20.01% in 2021; however, it was usually higher under the control and low N conditions. The amount of 15N excess increased as the N rate increased: N5 had the highest 15N excess at the maturity stage in the upper (2.28 ± 0.36%), the middle (1.77 ± 0.28%), and the lower portion (1.68 ± 1.01%). Compared to N1, N fertilization (N2-N5) increased 15N excess in the various shoot portions by 50, 38, and 35% at maturity for upper, middle, and lower portions, respectively. At maturity, the 15N excess remobilized to the grain under N1-N5 was between 5 and 8%. Our findings revealed that N had a significant impact on yield and N isotope discrimination in spring wheat that these two parameters can interact, and that future research on the relationship between yield and N isotope discrimination in spring wheat should take these factors into account.
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Affiliation(s)
- Zechariah Effah
- State Key Laboratory of Arid Land Crop Science, Lanzhou, China
- College of Agronomy, Gansu Agricultural University, Lanzhou, China
- Council for Scientific and Industrial Research (CSIR)-Plant Genetic Resources Research Institute, Bunso, Ghana
| | - Lingling Li
- State Key Laboratory of Arid Land Crop Science, Lanzhou, China
- College of Agronomy, Gansu Agricultural University, Lanzhou, China
| | - Junhong Xie
- State Key Laboratory of Arid Land Crop Science, Lanzhou, China
- College of Agronomy, Gansu Agricultural University, Lanzhou, China
| | - Benjamin Karikari
- Department of Crop Science, Faculty of Agriculture, Food and Consumer Sciences, University for Development Studies, Tamale, Ghana
| | - Jinbin Wang
- State Key Laboratory of Arid Land Crop Science, Lanzhou, China
- College of Agronomy, Gansu Agricultural University, Lanzhou, China
| | - Min Zeng
- State Key Laboratory of Arid Land Crop Science, Lanzhou, China
- College of Agronomy, Gansu Agricultural University, Lanzhou, China
| | - Linlin Wang
- State Key Laboratory of Arid Land Crop Science, Lanzhou, China
- College of Agronomy, Gansu Agricultural University, Lanzhou, China
| | - Solomon Boamah
- Biocontrol Engineering Laboratory of Crop Diseases and Pests of Gansu Province, College of Plant Protection, Gansu Agricultural University, Lanzhou, China
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16
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Sartori K, Violle C, Vile D, Vasseur F, de Villemereuil P, Bresson J, Gillespie L, Fletcher LR, Sack L, Kazakou E. Do leaf nitrogen resorption dynamics align with the slow‐fast continuum? A test at the intraspecific level. Funct Ecol 2022. [DOI: 10.1111/1365-2435.14029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kevin Sartori
- CEFE Univ Montpellier CNRS EPHE, IRD Univ Paul Valéry Montpellier 3 Montpellier France
| | - Cyrille Violle
- CEFE Univ Montpellier CNRS EPHE, IRD Univ Paul Valéry Montpellier 3 Montpellier France
| | - Denis Vile
- LEPSE Univ Montpellier INRAE, Institut Agro Montpellier France
| | - François Vasseur
- CEFE Univ Montpellier CNRS EPHE, IRD Univ Paul Valéry Montpellier 3 Montpellier France
- LEPSE Univ Montpellier INRAE, Institut Agro Montpellier France
| | - Pierre de Villemereuil
- Institut de Systématique Évolution, Biodiversité (ISYEB), École Pratique des Hautes Études PSL, MNHN, CNRS, Sorbonne Université, Université des Antilles Paris France
| | - Justine Bresson
- CEFE Univ Montpellier CNRS EPHE, IRD Univ Paul Valéry Montpellier 3 Montpellier France
| | - Lauren Gillespie
- CEFE Univ Montpellier CNRS EPHE, IRD Univ Paul Valéry Montpellier 3 Montpellier France
| | | | | | - Elena Kazakou
- CEFE Univ Montpellier CNRS EPHE, IRD Univ Paul Valéry Montpellier 3 Montpellier France
- Univ Montpellier Institut Agro, Montpellier SupAgro, Montpellier France
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17
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Decouard B, Bailly M, Rigault M, Marmagne A, Arkoun M, Soulay F, Caïus J, Paysant-Le Roux C, Louahlia S, Jacquard C, Esmaeel Q, Chardon F, Masclaux-Daubresse C, Dellagi A. Genotypic Variation of Nitrogen Use Efficiency and Amino Acid Metabolism in Barley. FRONTIERS IN PLANT SCIENCE 2022; 12:807798. [PMID: 35185958 PMCID: PMC8854266 DOI: 10.3389/fpls.2021.807798] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 12/02/2021] [Indexed: 06/01/2023]
Abstract
Owing to the large genetic diversity of barley and its resilience under harsh environments, this crop is of great value for agroecological transition and the need for reduction of nitrogen (N) fertilizers inputs. In the present work, we investigated the diversity of a North African barley genotype collection in terms of growth under limiting N (LN) or ample N (HN) supply and in terms of physiological traits including amino acid content in young seedlings. We identified a Moroccan variety, Laanaceur, accumulating five times more lysine in its leaves than the others under both N nutritional regimes. Physiological characterization of the barley collection showed the genetic diversity of barley adaptation strategies to LN and highlighted a genotype x environment interaction. In all genotypes, N limitation resulted in global biomass reduction, an increase in C concentration, and a higher resource allocation to the roots, indicating that this organ undergoes important adaptive metabolic activity. The most important diversity concerned leaf nitrogen use efficiency (LNUE), root nitrogen use efficiency (RNUE), root nitrogen uptake efficiency (RNUpE), and leaf nitrogen uptake efficiency (LNUpE). Using LNUE as a target trait reflecting barley capacity to deal with N limitation, this trait was positively correlated with plant nitrogen uptake efficiency (PNUpE) and RNUpE. Based on the LNUE trait, we determined three classes showing high, moderate, or low tolerance to N limitation. The transcriptomic approach showed that signaling, ionic transport, immunity, and stress response were the major functions affected by N supply. A candidate gene encoding the HvNRT2.10 transporter was commonly up-regulated under LN in the three barley genotypes investigated. Genes encoding key enzymes required for lysine biosynthesis in plants, dihydrodipicolinate synthase (DHPS) and the catabolic enzyme, the bifunctional Lys-ketoglutarate reductase/saccharopine dehydrogenase are up-regulated in Laanaceur and likely account for a hyperaccumulation of lysine in this genotype. Our work provides key physiological markers of North African barley response to low N availability in the early developmental stages.
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Affiliation(s)
- Bérengère Decouard
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
| | - Marlène Bailly
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
| | - Martine Rigault
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
| | - Anne Marmagne
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
| | - Mustapha Arkoun
- Agro Innovation International - Laboratoire Nutrition Végétale, TIMAC AGRO International SAS, Saint Malo, France
| | - Fabienne Soulay
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
| | - José Caïus
- Université Paris-Saclay, CNRS, INRAE, University of Évry Val d′Essonne, Institute of Plant Sciences Paris-Saclay (IPS2), Orsay, France
- Université de Paris, CNRS, INRAE, Institute of Plant Sciences Paris-Saclay (IPS2), Orsay, France
| | - Christine Paysant-Le Roux
- Université Paris-Saclay, CNRS, INRAE, University of Évry Val d′Essonne, Institute of Plant Sciences Paris-Saclay (IPS2), Orsay, France
- Université de Paris, CNRS, INRAE, Institute of Plant Sciences Paris-Saclay (IPS2), Orsay, France
| | - Said Louahlia
- Natural Resources and Environment Lab, Faculté Polydiscipliniare de Taza, Université Sidi Mohamed Ben Abdellah, Taza, Morocco
| | - Cédric Jacquard
- Université de Reims Champagne Ardenne, RIBP EA 4707 USC INRAE 1488, SFR Condorcet FR CNRS 3417, Reims, France
| | - Qassim Esmaeel
- Université de Reims Champagne Ardenne, RIBP EA 4707 USC INRAE 1488, SFR Condorcet FR CNRS 3417, Reims, France
| | - Fabien Chardon
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
| | - Céline Masclaux-Daubresse
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
| | - Alia Dellagi
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
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18
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Zhao C, Ma G, Zhou L, Zhang S, Su L, Sun X, Borrás-Hidalgo O, Li K, Yue Q, Zhao L. Effects of nitrogen levels on gene expression and amino acid metabolism in Welsh onion. BMC Genomics 2021; 22:803. [PMID: 34743697 PMCID: PMC8573885 DOI: 10.1186/s12864-021-08130-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Accepted: 10/28/2021] [Indexed: 01/15/2023] Open
Abstract
Background Welsh onion constitutes an important crop due to its benefits in traditional medicine. Nitrogen is an important nutrient for plant growth and yield; however, little is known about its influence on the mechanisms of Welsh onion regulation genes. In this study, we introduced a gene expression and amino acid analysis of Welsh onion treated with different concentrations of nitrogen (N0, N1, and N2 at 0 kg/ha, 130 kg/ha, and 260 kg/ha, respectively). Results Approximately 1,665 genes were differentially regulated with different concentrations of nitrogen. Gene ontology enrichment analysis revealed that the genes involved in metabolic processes, protein biosynthesis, and transportation of amino acids were highly represented. KEGG analysis indicated that the pathways were related to amino acid metabolism, cysteine, beta-alanine, arginine, proline, and glutathione. Differential gene expression in response to varying nitrogen concentrations resulted in different amino acid content. A close relationship between gene expression and the content of amino acids was observed. Conclusions This work examined the effects of nitrogen on gene expression and amino acid synthesis and provides important evidence on the efficient use of nitrogen in Welsh onion.
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Affiliation(s)
- Chen Zhao
- State Key Laboratory of Biobased Material and Green Papermaking, Shandong Provincial Key Lab. of Microbial Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China.,Shandong Provincial Key Laboratory of Food and Fermentation Engineering, Shandong Food Ferment Industry Research & Design Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China.,School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Guanchu Ma
- State Key Laboratory of Biobased Material and Green Papermaking, Shandong Provincial Key Lab. of Microbial Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Lin Zhou
- State Key Laboratory of Biobased Material and Green Papermaking, Shandong Provincial Key Lab. of Microbial Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Song Zhang
- State Key Laboratory of Biobased Material and Green Papermaking, Shandong Provincial Key Lab. of Microbial Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Le Su
- State Key Laboratory of Biobased Material and Green Papermaking, Shandong Provincial Key Lab. of Microbial Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Xin Sun
- State Key Laboratory of Biobased Material and Green Papermaking, Shandong Provincial Key Lab. of Microbial Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Orlando Borrás-Hidalgo
- State Key Laboratory of Biobased Material and Green Papermaking, Shandong Provincial Key Lab. of Microbial Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Kunlun Li
- Jinan Hangchen Biotechnology Co., Ltd, Jinan, China
| | - Qiulin Yue
- State Key Laboratory of Biobased Material and Green Papermaking, Shandong Provincial Key Lab. of Microbial Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China.
| | - Lin Zhao
- State Key Laboratory of Biobased Material and Green Papermaking, Shandong Provincial Key Lab. of Microbial Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China.
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19
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Duarte GT, Pandey PK, Vaid N, Alseekh S, Fernie AR, Nikoloski Z, Laitinen RAE. Plasticity of rosette size in response to nitrogen availability is controlled by an RCC1-family protein. PLANT, CELL & ENVIRONMENT 2021; 44:3398-3411. [PMID: 34228823 DOI: 10.1111/pce.14146] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 07/01/2021] [Accepted: 07/02/2021] [Indexed: 05/12/2023]
Abstract
Nitrogen (N) is fundamental to plant growth, development and yield. Genes underlying N utilization and assimilation are well-characterized, but mechanisms underpinning plasticity of different phenotypes in response to N remain elusive. Here, using Arabidopsis thaliana accessions, we dissected the genetic architecture of plasticity in early and late rosette diameter, flowering time and yield, in response to three levels of N in the soil. Furthermore, we found that the plasticity in levels of primary metabolites were related with the plasticities of the studied traits. Genome-wide association analysis identified three significant associations for phenotypic plasticity, one for early rosette diameter and two for flowering time. We confirmed that the gene At1g19880, hereafter named as PLASTICITY OF ROSETTE TO NITROGEN 1 (PROTON1), encoding for a regulator of chromatin condensation 1 (RCC1) family protein, conferred plasticity of rosette diameter in response to N. Treatment of PROTON1 T-DNA line with salt implied that the reduced plasticity of early rosette diameter was not a general growth response to stress. We further showed that plasticities of growth and flowering-related traits differed between environmental cues, indicating decoupled genetic programs regulating these traits. Our findings provide a prospective to identify genes that stabilize performance under fluctuating environments.
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Affiliation(s)
- Gustavo Turqueto Duarte
- Molecular Mechanisms of Plant Adaptation - group, Max Planck Institute of Molecular Plant Physiology, Potsdam, Germany
| | - Prashant K Pandey
- Molecular Mechanisms of Plant Adaptation - group, Max Planck Institute of Molecular Plant Physiology, Potsdam, Germany
- National Research Council Canada (NRC-CNRC), Aquatic and Crop Resource Development (ACRD), Saskatoon, Saskatchewan, Canada
| | - Neha Vaid
- Molecular Mechanisms of Plant Adaptation - group, Max Planck Institute of Molecular Plant Physiology, Potsdam, Germany
- Biological Sciences, University of Calgary, Calgary, Alberta, Canada
| | - Saleh Alseekh
- Central Metabolism - group, Max Planck Institute of Molecular Plant Physiology, Potsdam, Germany
- Department of Plant Metabolomics, Center of Plant Systems Biology, Plovdiv, Bulgaria
| | - Alisdair R Fernie
- Central Metabolism - group, Max Planck Institute of Molecular Plant Physiology, Potsdam, Germany
- Department of Plant Metabolomics, Center of Plant Systems Biology, Plovdiv, Bulgaria
| | - Zoran Nikoloski
- Systems Biology and Mathematical Modeling - group, Max Planck Institute of Molecular Plant Physiology, Potsdam, Germany
- Department of Bioinformatics and Mathematical Modeling, Center of Plant Systems Biology, Plovdiv, Bulgaria
- Bioinformatics, Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany
| | - Roosa A E Laitinen
- Molecular Mechanisms of Plant Adaptation - group, Max Planck Institute of Molecular Plant Physiology, Potsdam, Germany
- Organismal and Evolutionary Research Programme, Faculty of Biological and Environmental Sciences, Viikki Plant Science Centre, University of Helsinki, Helsinki, Finland
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20
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Ishihara H, Moraes TA, Arrivault S, Stitt M. Assessing Protein Synthesis and Degradation Rates in Arabidopsis thaliana Using Amino Acid Analysis. Curr Protoc 2021; 1:e114. [PMID: 34000100 DOI: 10.1002/cpz1.114] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Plants continually synthesize and degrade proteins, for example, to adjust protein content during development or during adaptation to new environments. In order to estimate global protein synthesis and degradation rates in plants, we developed a relatively simple and inexpensive method using a combination of 13 CO2 labeling and mass spectrometry-based analyses. Arabidopsis thaliana plants are subjected to a 24-hr 13 CO2 pulse followed by a 4-day 12 CO2 chase. Soluble alanine and serine from total protein and glucose from cell wall material are analyzed by gas chromatography time-of-flight mass spectrometry (GC-TOF-MS) and their 13 C enrichment (%) is estimated. The rate of protein synthesis during the 13 CO2 pulse experiment is defined as the rate of incorporation of labeled amino acids into proteins normalized by a correction factor for incomplete enrichment in free amino acid pools. The rate of protein degradation is estimated as the difference between the rate of protein synthesis and the relative growth rate calculated using the 13 C enrichment of glucose from cell wall material. Degradation rates are also estimated from the 12 CO2 pulse experiment. The following method description includes setting up and performing labeling experiments, preparation and measurement of samples, and calculation steps. In addition, an R script is provided for the calculations. 2021 The Authors. Current Protocols published by Wiley Periodicals LLC. Basic Protocol 1: Setting up the 13 CO2 labeling system and stable isotope labeling of Arabidopsis thaliana rosette leaves Basic Protocol 2: Extraction of soluble amino acids for GC-TOF-MS analysis Basic Protocol 3: Preparation of amino acids from total protein for GC-TOF-MS analysis Basic Protocol 4: Preparation of sugars from cell wall material for GC-TOF-MS analysis Basis Protocol 5: GC-TOF-MS analysis of 13 C-labeled samples and estimation of 13 C enrichment (%) Basis Protocol 6: Estimation of protein synthesis and degradation rates.
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Affiliation(s)
- Hirofumi Ishihara
- Max Planck Institute of Molecular Plant Physiology, Potsdam, Germany
| | - Thiago A Moraes
- Max Planck Institute of Molecular Plant Physiology, Potsdam, Germany
| | | | - Mark Stitt
- Max Planck Institute of Molecular Plant Physiology, Potsdam, Germany
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21
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Meng X, Wang X, Zhang Z, Xiong S, Wei Y, Guo J, Zhang J, Wang L, Ma X, Tegeder M. Transcriptomic, proteomic, and physiological studies reveal key players in wheat nitrogen use efficiency under both high and low nitrogen supply. JOURNAL OF EXPERIMENTAL BOTANY 2021; 72:4435-4456. [PMID: 33829261 DOI: 10.1093/jxb/erab153] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Accepted: 04/02/2021] [Indexed: 06/12/2023]
Abstract
The effective use of available nitrogen (N) to improve crop grain yields provides an important strategy to reduce environmental N pollution and promote sustainable agriculture. However, little is known about the common genetic basis of N use efficiency (NUE) at varying N availability. Two wheat (Triticum aestivum L.) cultivars were grown in the field with high, moderate, and low N supply. Cultivar Zhoumai 27 outperformed Aikang 58 independent of the N supply and showed improved growth, canopy leaf area index, flag leaf surface area, grain number, and yield, and enhanced NUE due to both higher N uptake and utilization efficiency. Further, transcriptome and proteome analyses were performed using flag leaves that provide assimilates for grain growth. The results showed that many genes or proteins that are up- or down-regulated under all N regimes are associated with N and carbon metabolism and transport. This was reinforced by cultivar differences in photosynthesis, assimilate phloem transport, and grain protein/starch yield. Overall, our study establishes that improving NUE at both high and low N supply requires distinct adjustments in leaf metabolism and assimilate partitioning. Identified key genes/proteins may individually or concurrently regulate NUE and are promising targets for maximizing crop NUE irrespective of the N supply.
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Affiliation(s)
- Xiaodan Meng
- Collaborative Innovation Center of Henan Grain Crops, Henan Agricultural University, ZhengzhouChina
- College of Agronomy, Henan Agricultural University, ZhengzhouChina
- School of Biological Sciences, Washington State University, Pullman, WAUSA
| | - Xiaochun Wang
- Collaborative Innovation Center of Henan Grain Crops, Henan Agricultural University, ZhengzhouChina
| | - Zhiyong Zhang
- Collaborative Innovation Center of Henan Grain Crops, Henan Agricultural University, ZhengzhouChina
- College of Agronomy, Henan Agricultural University, ZhengzhouChina
| | - Shuping Xiong
- Collaborative Innovation Center of Henan Grain Crops, Henan Agricultural University, ZhengzhouChina
- College of Agronomy, Henan Agricultural University, ZhengzhouChina
| | - Yihao Wei
- Collaborative Innovation Center of Henan Grain Crops, Henan Agricultural University, ZhengzhouChina
- College of Agronomy, Henan Agricultural University, ZhengzhouChina
| | - Jianbiao Guo
- College of Agronomy, Henan Agricultural University, ZhengzhouChina
| | - Jie Zhang
- College of Agronomy, Henan Agricultural University, ZhengzhouChina
| | - Lulu Wang
- College of Agronomy, Henan Agricultural University, ZhengzhouChina
| | - Xinming Ma
- Collaborative Innovation Center of Henan Grain Crops, Henan Agricultural University, ZhengzhouChina
- College of Agronomy, Henan Agricultural University, ZhengzhouChina
| | - Mechthild Tegeder
- School of Biological Sciences, Washington State University, Pullman, WAUSA
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22
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Bollam S, Romana KK, Rayaprolu L, Vemula A, Das RR, Rathore A, Gandham P, Chander G, Deshpande SP, Gupta R. Nitrogen Use Efficiency in Sorghum: Exploring Native Variability for Traits Under Variable N-Regimes. FRONTIERS IN PLANT SCIENCE 2021; 12:643192. [PMID: 33968102 PMCID: PMC8097177 DOI: 10.3389/fpls.2021.643192] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 03/29/2021] [Indexed: 06/12/2023]
Abstract
Exploring the natural genetic variability and its exploitation for improved Nitrogen Use Efficiency (NUE) in sorghum is one of the primary goals in the modern crop improvement programs. The integrated strategies include high-throughput phenotyping, next generation sequencing (NGS)-based genotyping technologies, and a priori selected candidate gene studies that help understand the detailed physiological and molecular mechanisms underpinning this complex trait. A set of sixty diverse sorghum genotypes was evaluated for different vegetative, reproductive, and yield traits related to NUE in the field (under three N regimes) for two seasons. Significant variations for different yield and related traits under 0 and 50% N confirmed the availability of native genetic variability in sorghum under low N regimes. Sorghum genotypes with distinct genetic background had interestingly similar NUE associated traits. The Genotyping-By-Sequencing based SNPs (>89 K) were used to study the population structure, and phylogenetic groupings identified three distinct groups. The information of grain N and stalk N content of the individuals covered on the phylogenetic groups indicated randomness in the distribution for adaptation under variable N regimes. This study identified promising sorghum genotypes with consistent performance under varying environments, with buffer capacity for yield under low N conditions. We also report better performing genotypes for varied production use-grain, stover, and dual-purpose sorghum having differential adaptation response to NUE traits. Expression profiling of NUE associated genes in shoot and root tissues of contrasting lines (PVK801 and HDW703) grown in varying N conditions revealed interesting outcomes. Root tissues of contrasting lines exhibited differential expression profiles for transporter genes [ammonium transporter (SbAMT), nitrate transporters (SbNRT)]; primary assimilatory (glutamine synthetase (SbGS), glutamate synthase (SbGOGAT[NADH], SbGOGAT[Fd]), assimilatory genes [nitrite reductase (SbNiR[NADH]3)]; and amino acid biosynthesis associated gene [glutamate dehydrogenase (SbGDH)]. Identification and expression profiling of contrasting sorghum genotypes in varying N dosages will provide new information to understand the response of NUE genes toward adaptation to the differential N regimes in sorghum. High NUE genotypes identified from this study could be potential candidates for in-depth molecular analysis and contribute toward the development of N efficient sorghum cultivars.
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23
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The SV, Snyder R, Tegeder M. Targeting Nitrogen Metabolism and Transport Processes to Improve Plant Nitrogen Use Efficiency. FRONTIERS IN PLANT SCIENCE 2021; 11:628366. [PMID: 33732269 PMCID: PMC7957077 DOI: 10.3389/fpls.2020.628366] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 12/31/2020] [Indexed: 05/22/2023]
Abstract
In agricultural cropping systems, relatively large amounts of nitrogen (N) are applied for plant growth and development, and to achieve high yields. However, with increasing N application, plant N use efficiency generally decreases, which results in losses of N into the environment and subsequently detrimental consequences for both ecosystems and human health. A strategy for reducing N input and environmental losses while maintaining or increasing plant performance is the development of crops that effectively obtain, distribute, and utilize the available N. Generally, N is acquired from the soil in the inorganic forms of nitrate or ammonium and assimilated in roots or leaves as amino acids. The amino acids may be used within the source organs, but they are also the principal N compounds transported from source to sink in support of metabolism and growth. N uptake, synthesis of amino acids, and their partitioning within sources and toward sinks, as well as N utilization within sinks represent potential bottlenecks in the effective use of N for vegetative and reproductive growth. This review addresses recent discoveries in N metabolism and transport and their relevance for improving N use efficiency under high and low N conditions.
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Affiliation(s)
| | | | - Mechthild Tegeder
- School of Biological Sciences, Washington State University, Pullman, WA, United States
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24
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Jasinski S, Fabrissin I, Masson A, Marmagne A, Lécureuil A, Bill L, Chardon F. ACCELERATED CELL DEATH 6 Acts on Natural Leaf Senescence and Nitrogen Fluxes in Arabidopsis. FRONTIERS IN PLANT SCIENCE 2021; 11:611170. [PMID: 33488657 PMCID: PMC7817547 DOI: 10.3389/fpls.2020.611170] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 11/23/2020] [Indexed: 05/30/2023]
Abstract
As the last step of leaf development, senescence is a molecular process involving cell death mechanism. Leaf senescence is trigged by both internal age-dependent factors and environmental stresses. It must be tightly regulated for the plant to adopt a proper response to environmental variation and to allow the plant to recycle nutrients stored in senescing organs. However, little is known about factors that regulate both nutrients fluxes and plant senescence. Taking advantage of variation for natural leaf senescence between Arabidopsis thaliana accessions, Col-0 and Ct-1, we did a fine mapping of a quantitative trait loci for leaf senescence and identified ACCELERATED CELL DEATH 6 (ACD6) as the causal gene. Using two near-isogeneic lines, differing solely around the ACD6 locus, we showed that ACD6 regulates rosette growth, leaf chlorophyll content, as well as leaf nitrogen and carbon percentages. To unravel the role of ACD6 in N remobilization, the two isogenic lines and acd6 mutant were grown and labeled with 15N at the vegetative stage in order to determine 15N partitioning between plant organs at harvest. Results showed that N remobilization efficiency was significantly lower in all the genotypes with lower ACD6 activity irrespective of plant growth and productivity. Measurement of N uptake at vegetative and reproductive stages revealed that ACD6 did not modify N uptake efficiency but enhanced nitrogen translocation from root to silique. In this study, we have evidenced a new role of ACD6 in regulating both sequential and monocarpic senescences and disrupting the balance between N remobilization and N uptake that is required for a good seed filling.
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25
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Ray K, Banerjee H, Dutta S, Sarkar S, Murrell TS, Singh VK, Majumdar K. Macronutrient Management Effects on Nutrient Accumulation, Partitioning, Remobilization, and Yield of Hybrid Maize Cultivars. FRONTIERS IN PLANT SCIENCE 2020; 11:1307. [PMID: 32983197 PMCID: PMC7492750 DOI: 10.3389/fpls.2020.01307] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Accepted: 08/11/2020] [Indexed: 06/11/2023]
Abstract
It is critical to understand nutrient dynamics within different plant parts to correctly fine-tune agronomic advices, and to update breeding programs for increasing nutrient use efficiencies and yields. Farmer's field-based research was conducted to assess the effects of nitrogen (N), phosphorus (P), and potassium (K) levels on dry matter and nutrient accumulation, partitioning, and remobilization dynamics in three popular maize (Zea mays L.) hybrids (P3522, P3396, and Rajkumar) over two years in an alluvial soil of West Bengal, India. Experimental results revealed that NPK rates as well as different cultivars significantly (p ≤ 0.05) influenced the dry matter accumulation (DMA) in different plant parts of maize at both silking and physiological maturity. The post-silking dry matter accumulation (PSDMA) and post-silking N, P, and K accumulations (PSNA, PSPA, PSKA) were highest in cultivar P3396. However, cultivar P3522 recorded the highest nutrient remobilizations and contributions to grain nutrient content. Total P and K accumulation were highest with 125% of the recommended dose of fertilizer (RDF) while total N accumulation increased even after 150% RDF (100% RDF is 200 kg N, 60 kg P2O5, and 60 kg K2O ha-1 for the study region). Application of 125% RDF was optimum for PSDMA. The PSNA continued to increase up to 150% RDF while 125% RDF was optimum for PSPA. Cultivar differences significantly affected both remobilization efficiency (RE) and contribution to grain nutrient content for all tested macronutrients (N, P, and K). In general, RE as well as contribution to grain nutrient content was highest at 125% RDF for N and K, and at 100% RDF for P (either significantly or at par with other rates) for plots receiving nutrients. For all tested cultivars, nutrient remobilization and contribution to grain nutrient content was highest under nutrient-omission plots and absolute control plots. Both year and cultivar effects were non-significant for both grain and stover yields of maize. Application of 75% RDF was sufficient to achieve the attainable yield at the study location. The cultivar P3522 showed higher yield over both P3396 and Rajkumar, irrespective of fertilizer doses, although, the differences were not statistically significant (p ≥ 0.05). The study underscores the importance of maize adaptive responses in terms of nutrients accumulation and remobilization at different levels of nutrient availability for stabilizing yield.
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Affiliation(s)
- Krishnendu Ray
- Sasya Shyamala Krishi Vigyan Kendra, Ramakrishna Mission Vivekananda Educational and Research Institute, Sonarpur, India
| | - Hirak Banerjee
- Bidhan Chandra Krishi Viswavidyalaya, Department of Agronomy, Mohanpur, India
| | - Sudarshan Dutta
- African Plant Nutrition Institute and Mohammed VI Polytechnic University, Benguérir, Morocco
| | - Sukamal Sarkar
- Bidhan Chandra Krishi Viswavidyalaya, Department of Agronomy, Mohanpur, India
| | - T. Scott Murrell
- African Plant Nutrition Institute and Mohammed VI Polytechnic University, Benguérir, Morocco
- Purdue University, Department of Agronomy, West Lafayette, IN, United States
| | - Vinod K. Singh
- Division of Agronomy, Indian Council of Agricultural Research–Indian Agricultural Research Institute, New Delhi, India
| | - Kaushik Majumdar
- African Plant Nutrition Institute and Mohammed VI Polytechnic University, Benguérir, Morocco
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26
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Gong X, Liu X, Pan Q, Mi G, Chen F, Yuan L. Combined physiological, transcriptome, and genetic analysis reveals a molecular network of nitrogen remobilization in maize. JOURNAL OF EXPERIMENTAL BOTANY 2020; 71:5061-5073. [PMID: 32392584 DOI: 10.1093/jxb/eraa229] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Accepted: 05/06/2020] [Indexed: 05/28/2023]
Abstract
In plants, nitrogen remobilization from source to sink organs is an important process regulated by complex transcriptional regulatory networks. However, the relationship between nitrogen remobilization and leaf senescence and the molecular regulatory network that controls them are unknown in maize. Here, using 15N labeling and a transcriptome approach, a dynamic analysis of the nitrogen remobilization process was conducted in two elite maize inbred lines (PH4CV and PH6WC) with contrasting leaf senescence. PH4CV showed higher nitrogen remobilization efficiency (NRE) than PH6WC, mainly in the middle and lower leaves from 15 d to 35 d after silking. The co-expression network analysis revealed that ethylene and cytokinin metabolism-related genes triggered the onset of nitrogen remobilization, while abscisic acid and jasmonic acid biosynthesis-related genes controlled the progression of nitrogen remobilization. By integrating genetic analysis, functional annotation, and gene expression, two candidate genes underlying a major quantitative trait locus of NRE were identified, namely an early senescence acting gene (ZmASR6) and an ATP-dependent Clp protease gene (GRMZM2G172230). Hormone-coupled transcription factors and downstream target genes reveal a gene regulatory network for the nitrogen remobilization process after silking in maize. These results uncovered a sophisticated regulatory mechanism for nitrogen remobilization, and further provided characterization of valuable genes for genetic improvement of nitrogen use efficiency in maize.
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Affiliation(s)
- Xiaoping Gong
- College of Resources and Environmental Sciences; National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions of MOE, China Agricultural University, Beijing, China
| | - Xiaoyang Liu
- College of Resources and Environmental Sciences; National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions of MOE, China Agricultural University, Beijing, China
| | - Qingchun Pan
- College of Resources and Environmental Sciences; National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions of MOE, China Agricultural University, Beijing, China
| | - Guohua Mi
- College of Resources and Environmental Sciences; National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions of MOE, China Agricultural University, Beijing, China
| | - Fanjun Chen
- College of Resources and Environmental Sciences; National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions of MOE, China Agricultural University, Beijing, China
| | - Lixing Yuan
- College of Resources and Environmental Sciences; National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions of MOE, China Agricultural University, Beijing, China
- Center for Crop Functional Genomics and Molecular Breeding, China Agricultural University, Beijing, China
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27
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Marmagne A, Jasinski S, Fagard M, Bill L, Guerche P, Masclaux-Daubresse C, Chardon F. Post-flowering biotic and abiotic stresses impact nitrogen use efficiency and seed filling in Arabidopsis thaliana. JOURNAL OF EXPERIMENTAL BOTANY 2020; 71:4578-4590. [PMID: 31930315 PMCID: PMC7382380 DOI: 10.1093/jxb/eraa011] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 01/10/2020] [Indexed: 05/31/2023]
Abstract
Nitrogen (N) is an essential nutrient that plants require for the synthesis of amino acids, proteins, and many other important metabolites. Plant metabolism and growth are consequently dependent on the amount of N that is assimilated and distributed from source leaves to developing sinks, such as fruits and seeds. The environmental stresses enhanced by climate change deeply influence seed yield and seed composition, and may disturb N use efficiency (NUE) in pants. We aimed to investigate plant responses to extreme climates with regard to NUE, N remobilization efficiency, and seed composition. By studying a collection of Arabidopsis genotypes showing a range of C:N ratios in seeds, we investigated the impact of different post-flowering growth conditions (control, heat, drought, low nitrate availability, induced senescence, and induced plant defense) on seed yield, N allocation in organs, NUE, and N remobilization efficiency. We analysed how post-flowering stresses could change seed filling and showed that post-flowering stresses change both the range of N and C concentrations and the C:N stoichiometry in seeds. Using a new trait, called delta seed composition, we measured the deviation in C:N stoichiometry of each genotype and revealed the genetic determinism of the C:N stoichiometry. Altogether, the results indicate that extreme climate impacts NUE dramatically in plants and generates different bottlenecks in N fluxes during seed filling.
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Affiliation(s)
- Anne Marmagne
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay,, Versailles, France
| | - Sophie Jasinski
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay,, Versailles, France
| | - Mathilde Fagard
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay,, Versailles, France
| | - Laurence Bill
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay,, Versailles, France
| | - Philippe Guerche
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay,, Versailles, France
| | | | - Fabien Chardon
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay,, Versailles, France
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28
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Lee S, Park J, Lee J, Shin D, Marmagne A, Lim PO, Masclaux-Daubresse C, An G, Nam HG. OsASN1 Overexpression in Rice Increases Grain Protein Content and Yield under Nitrogen-Limiting Conditions. PLANT & CELL PHYSIOLOGY 2020; 61:1309-1320. [PMID: 32384162 PMCID: PMC7377344 DOI: 10.1093/pcp/pcaa060] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 04/28/2020] [Indexed: 05/10/2023]
Abstract
Nitrogen (N) is a major limiting factor affecting crop yield in unfertilized soil. Thus, cultivars with a high N use efficiency (NUE) and good grain protein content (GPC) are needed to fulfill the growing food demand and to reduce environmental burden. This is especially true for rice (Oryza sativa L.) that is cultivated with a high input of N fertilizer and is a primary staple food crop for more than half of the global population. Here, we report that rice asparagine synthetase 1 (OsASN1) is required for grain yield and grain protein contents under both N-sufficient (conventional paddy fields) and N-limiting conditions from analyses of knockout mutant plants. In addition, we show that overexpression (OX) of OsASN1 results in better nitrogen uptake and assimilation, and increased tolerance to N limitation at the seedling stage. Under field conditions, the OsASN1 OX rice plants produced grains with increased N and protein contents without yield reduction compared to wild-type (WT) rice. Under N-limited conditions, the OX plants displayed increased grain yield and protein content with enhanced photosynthetic activity compared to WT rice. Thus, OsASN1 can be an effective target gene for the development of rice cultivars with higher grain protein content, NUE, and grain yield under N-limiting conditions.
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Affiliation(s)
- Sichul Lee
- Center for Plant Aging Research, Institute for Basic Science (IBS), Daegu 42988, Korea
| | - Joonheum Park
- Center for Plant Aging Research, Institute for Basic Science (IBS), Daegu 42988, Korea
| | - Jinwon Lee
- Center for Plant Aging Research, Institute for Basic Science (IBS), Daegu 42988, Korea
| | - Dongjin Shin
- Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration, Miryang 50424, Korea
| | - Anne Marmagne
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, 78000 Versailles, France
| | - Pyung Ok Lim
- Department of New Biology, DGIST, Daegu 42988, Korea
| | - Céline Masclaux-Daubresse
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, 78000 Versailles, France
| | - Gynheung An
- Department of Genetic Engineering and Crop Biotech Institute, Kyung Hee University, Yongin 17104, Korea
- Corresponding authors: Gynheung An, E-mail, ; Fax, +82312034969; Hong Gil Nam, E-mail, ; Fax, +82537851859
| | - Hong Gil Nam
- Center for Plant Aging Research, Institute for Basic Science (IBS), Daegu 42988, Korea
- Department of New Biology, DGIST, Daegu 42988, Korea
- Corresponding authors: Gynheung An, E-mail, ; Fax, +82312034969; Hong Gil Nam, E-mail, ; Fax, +82537851859
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29
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Lee S, Marmagne A, Park J, Fabien C, Yim Y, Kim S, Kim T, Lim PO, Masclaux‐Daubresse C, Nam HG. Concurrent activation of OsAMT1;2 and OsGOGAT1 in rice leads to enhanced nitrogen use efficiency under nitrogen limitation. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 103:7-20. [PMID: 32369636 PMCID: PMC7383903 DOI: 10.1111/tpj.14794] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Revised: 04/10/2020] [Accepted: 04/21/2020] [Indexed: 05/19/2023]
Abstract
Nitrogen (N) is a major factor for plant development and productivity. However, the application of nitrogenous fertilizers generates environmental and economic problems. To cope with the increasing global food demand, the development of rice varieties with high nitrogen use efficiency (NUE) is indispensable for reducing environmental issues and achieving sustainable agriculture. Here, we report that the concomitant activation of the rice (Oryza sativa) Ammonium transporter 1;2 (OsAMT1;2) and Glutamate synthetase 1 (OsGOGAT1) genes leads to increased tolerance to nitrogen limitation and to better ammonium uptake and N remobilization at the whole plant level. We show that the double activation of OsAMT1;2 and OsGOGAT1 increases plant performance in agriculture, providing better N grain filling without yield penalty under paddy field conditions, as well as better grain yield and N content when plants are grown under N llimitations in field conditions. Combining OsAMT1;2 and OsGOGAT1 activation provides a good breeding strategy for improving plant growth, nitrogen use efficiency and grain productivity, especially under nitrogen limitation, through the enhancement of both nitrogen uptake and assimilation.
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Affiliation(s)
- Sichul Lee
- Center for Plant Aging ResearchInstitute for Basic Science (IBS)42988DaeguKorea
| | - Anne Marmagne
- Institut Jean‐Pierre BourginINRAEAgroParisTechUniversité Paris‐Saclay78000VersaillesFrance
| | - Joonheum Park
- Center for Plant Aging ResearchInstitute for Basic Science (IBS)42988DaeguKorea
| | - Chardon Fabien
- Institut Jean‐Pierre BourginINRAEAgroParisTechUniversité Paris‐Saclay78000VersaillesFrance
| | - Yehyun Yim
- Center for Plant Aging ResearchInstitute for Basic Science (IBS)42988DaeguKorea
| | - Sun‐ji Kim
- Center for Plant Aging ResearchInstitute for Basic Science (IBS)42988DaeguKorea
| | - Tae‐Heon Kim
- Department of Southern Area Crop ScienceNational Institute of Crop Science (NICS)RDA50424MiryangRepublic of Korea
| | | | | | - Hong Gil Nam
- Center for Plant Aging ResearchInstitute for Basic Science (IBS)42988DaeguKorea
- Department of New BiologyDGIST42988DaeguKorea
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Taleski M, Chapman K, Imin N, Djordjevic MA, Groszmann M. The Peptide Hormone Receptor CEPR1 Functions in the Reproductive Tissue to Control Seed Size and Yield. PLANT PHYSIOLOGY 2020; 183:620-636. [PMID: 32317363 PMCID: PMC7271795 DOI: 10.1104/pp.20.00172] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 03/26/2020] [Indexed: 05/05/2023]
Abstract
The interaction of C-TERMINALLY ENCODED PEPTIDES (CEPs) with CEP RECEPTOR1 (CEPR1) controls root growth and development, as well as nitrate uptake, but has no known role in determining yield. We used physiological, microscopic, molecular, and grafting approaches to demonstrate a reproductive tissue-specific role for CEPR1 in controlling yield and seed size. Independent Arabidopsis (Arabidopsis thaliana) cepr1 null mutants showed disproportionately large reductions in yield and seed size relative to their decreased vegetative growth. These yield defects correlated with compromised reproductive development predominantly in female tissues, as well as chlorosis, and the accumulation of anthocyanins in cepr1 reproductive tissues. The thinning of competing reproductive organs to improve source-to-sink ratios in cepr1, along with reciprocal bolt-grafting experiments, demonstrated that CEPR1 acts locally in the reproductive bolt to control yield and seed size. CEPR1 is expressed throughout the vasculature of reproductive organs, including in the chalazal seed coat, but not in other seed tissues. This expression pattern implies that CEPR1 controls yield and seed size from the maternal tissue. The complementation of cepr1 mutants with transgenic CEPR1 rescued the yield and other phenotypes. Transcriptional analyses of cepr1 bolts showed alterations in the expression levels of several genes of the CEP-CEPR1 and nitrogen homeostasis pathways. This transcriptional profile was consistent with cepr1 bolts being nitrogen deficient and with a reproductive tissue-specific function for CEP-CEPR1 signaling. The results reveal a local role for CEPR1 in the maternal reproductive tissue in determining seed size and yield, likely via the control of nitrogen delivery to the reproductive sinks.
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Affiliation(s)
- Michael Taleski
- Division of Plant Sciences, Research School of Biology, College of Science, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Kelly Chapman
- Division of Plant Sciences, Research School of Biology, College of Science, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Nijat Imin
- School of Biological Sciences, University of Auckland, Auckland 1010, New Zealand
| | - Michael A Djordjevic
- Division of Plant Sciences, Research School of Biology, College of Science, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Michael Groszmann
- Division of Plant Sciences, Research School of Biology, College of Science, Australian National University, Canberra, Australian Capital Territory 2601, Australia
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Division of Plant Sciences, Research School of Biology, Australian National University, Acton, Australian Capital Territory 2601, Australia
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Özcan Y, Makineci E, Özdemir E. Biomass, carbon and nitrogen in single tree components of grey poplar (Populus × canescens) in an uncultivated habitat in Van, Turkey. ENVIRONMENTAL MONITORING AND ASSESSMENT 2020; 192:363. [PMID: 32405707 DOI: 10.1007/s10661-020-08263-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Accepted: 03/31/2020] [Indexed: 06/11/2023]
Abstract
The biomass, carbon and nitrogen storage in the single tree components (foliage, branch, crown, bark, stem and total aboveground) of the grey poplar (Populus × canescens) in its distribution in Eastern Anatolia (Van, Turkey) were determined and modelled. The biomass, carbon and nitrogen storages were not estimated at a stand level but were based on single trees. Regression models based on the tree diameter at breast height (DBH) and total tree height (H) were developed to estimate the biomass, carbon (C) storage and nitrogen (N) storage of the different tree components of a total of 28 grey poplar trees. The two main regression models in the power function were developed based only on the DBH (Model 1) and the combination of the DBH and height (D2H) (Model 2). All regression models, except for those of the foliage components, developed to estimate the biomass and C and N storages of the tree components were found to be statistically significant (p < 0.001). The partitioning of the total aboveground biomass in the bark, foliage, branches and stems was 0.7, 9, 17 and 73%, respectively. The average C concentrations of the tree components ranged from 48 (foliage) to 50% (bark, branch and stem), while the N concentrations ranged from 0.35 (stem) to 1.32% (foliage). Higher biomass and lower nitrogen concentrations of foliage compared with cultivated poplars were likely related to the natural site conditions, low soil nitrogen and/or characteristics of single tree growth.
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Affiliation(s)
- Yüksel Özcan
- Faculty of Forestry, Soil Science and Ecology Department, Istanbul University-Cerrahpaşa, Bahcekoy, Sariyer, Istanbul, Turkey
| | - Ender Makineci
- Faculty of Forestry, Soil Science and Ecology Department, Istanbul University-Cerrahpaşa, Bahcekoy, Sariyer, Istanbul, Turkey.
| | - Emrah Özdemir
- Faculty of Forestry, Forest Yield and Biometry Department, Istanbul University-Cerrahpaşa, Bahcekoy, Sariyer, Istanbul, Turkey
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Bedu M, Marmagne A, Masclaux-Daubresse C, Chardon F. Transcriptional Plasticity of Autophagy-Related Genes Correlates with the Genetic Response to Nitrate Starvation in Arabidopsis Thaliana. Cells 2020; 9:E1021. [PMID: 32326055 PMCID: PMC7226452 DOI: 10.3390/cells9041021] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 04/16/2020] [Accepted: 04/16/2020] [Indexed: 01/22/2023] Open
Abstract
In eukaryotes, autophagy, a catabolic mechanism for macromolecule and protein recycling, allows the maintenance of amino acid pools and nutrient remobilization. For a better understanding of the relationship between autophagy and nitrogen metabolism, we studied the transcriptional plasticity of autophagy genes (ATG) in nine Arabidopsis accessions grown under normal and nitrate starvation conditions. The status of the N metabolism in accessions was monitored by measuring the relative expression of 11 genes related to N metabolism in rosette leaves. The transcriptional variation of the genes coding for enzymes involved in ammonium assimilation characterize the genetic diversity of the response to nitrate starvation. Starvation enhanced the expression of most of the autophagy genes tested, suggesting a control of autophagy at transcriptomic level by nitrogen. The diversity of the gene responses among natural accessions revealed the genetic variation existing for autophagy independently of the nutritive condition, and the degree of response to nitrate starvation. We showed here that the genetic diversity of the expression of N metabolism genes correlates with that of the ATG genes in the two nutritive conditions, suggesting that the basal autophagy activity is part of the integral response of the N metabolism to nitrate availability.
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Affiliation(s)
- Magali Bedu
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000 Versailles, France; (M.B.); (A.M.); (C.M.-D.)
- Bureau International des Poids et Mesures (BIPM), Pavillon de Breteuil, F-92312 Sèvres, France
| | - Anne Marmagne
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000 Versailles, France; (M.B.); (A.M.); (C.M.-D.)
| | - Céline Masclaux-Daubresse
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000 Versailles, France; (M.B.); (A.M.); (C.M.-D.)
| | - Fabien Chardon
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000 Versailles, France; (M.B.); (A.M.); (C.M.-D.)
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Kohli A, Miro B, Balié J, d’A Hughes J. Photosynthesis research: a model to bridge fundamental science, translational products, and socio-economic considerations in agriculture. JOURNAL OF EXPERIMENTAL BOTANY 2020; 71:2281-2298. [PMID: 32076700 PMCID: PMC7135011 DOI: 10.1093/jxb/eraa087] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2019] [Accepted: 02/19/2020] [Indexed: 05/04/2023]
Abstract
Despite impressive success in molecular physiological understanding of photosynthesis, and preliminary evidence on its potential for quantum shifts in agricultural productivity, the question remains of whether increased photosynthesis, without parallel fine-tuning of the associated processes, is enough. There is a distinct lack of formal socio-economic impact studies that address the critical questions of product profiling, cost-benefit analysis, environmental trade-offs, and technological and market forces in product acceptability. When a relatively well understood process gains enough traction for translational value, its broader scientific and technical gap assessment, in conjunction with its socio-economic impact assessment for success, should be a prerequisite. The successes in the upstream basic understanding of photosynthesis should be integrated with a gap analysis for downstream translational applications to impact the farmers' and customers' lifestyles and livelihoods. The purpose of this review is to assess how the laboratory, the field, and the societal demands from photosynthesis could generate a transformative product. Two crucial recommendations from the analysis of the state of knowledge and potential ways forward are (i) the formulation of integrative mega-projects, which span the multistakeholder spectrum, to ensure rapid success in harnessing the transformative power of photosynthesis; and (ii) stipulating spatiotemporal, labour, and economic criteria to stage-gate deliverables.
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Affiliation(s)
- Ajay Kohli
- International Rice Research Institute, Los Baños, Philippines
| | - Berta Miro
- International Rice Research Institute, Los Baños, Philippines
| | - Jean Balié
- International Rice Research Institute, Los Baños, Philippines
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Zhang J, Gao J, Zhu Z, Song Y, Wang X, Wang X, Zhou X. MKK4/MKK5-MPK1/MPK2 cascade mediates SA-activated leaf senescence via phosphorylation of NPR1 in Arabidopsis. PLANT MOLECULAR BIOLOGY 2020; 102:463-475. [PMID: 31916083 DOI: 10.1007/s11103-019-00958-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Accepted: 12/28/2019] [Indexed: 06/10/2023]
Abstract
The mechanism by which endogenous salicylic acid (SA) regulates leaf senescence remains elusive. Here we provide direct evidence that an enhancement of endogenous SA level, via chemical-induced upregulation of ISOCHORISMATE SYNTHASE 1 (ICS1), could significantly accelerate the senescence process of old leaves through mediation of the key SA signaling component NON EXPRESSOR OF PATHOGENESIS RELATED GENES 1 (NPR1) in Arabidopsis. Importantly, by taking advantage of this chemically induced leaf senescence system, we identified a mitogen-activated protein kinase (MAPK) cascade MKK4/5-MPK1/2 that is required for the SA/NPR1-mediated leaf senescence. Both MKK4/5 and MPK1/2 exhibited SA-induced kinase activities, with MPK1/2 being the immediate targets of MKK4/5. Double mutants of mkk4 mkk5 and mpk1 mpk2 displayed delayed leaf senescence, while constitutive overexpression of the kinase genes led to premature leaf senescence. Such premature leaf senescence was suppressed when they were overexpressed in an SA synthesis defective mutant (sid2) or signaling detective mutant (npr1). We further showed that MPK1, but not MPK2, could directly phosphorylate NPR1. Meanwhile, MPK1 also mediated NPR1 monomerization. Notably, induction of disease resistance was significantly compromised in the single and double mutants of the kinase genes. Taken together, our data demonstrate that the MKK4/5-MPK1/2 cascade plays a critical role in modulating SA signaling through a complex regulatory network in Arabidopsis.
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Affiliation(s)
- Jianjian Zhang
- State Key Laboratory of Genetic Engineering and Fudan Center for Genetic Diversity and Designing Agriculture, School of Life Sciences, Fudan University, Shanghai, 200438, China
| | - Jiong Gao
- State Key Laboratory of Genetic Engineering and Fudan Center for Genetic Diversity and Designing Agriculture, School of Life Sciences, Fudan University, Shanghai, 200438, China.
| | - Zheng Zhu
- State Key Laboratory of Genetic Engineering and Fudan Center for Genetic Diversity and Designing Agriculture, School of Life Sciences, Fudan University, Shanghai, 200438, China
| | - Yi Song
- State Key Laboratory of Genetic Engineering and Fudan Center for Genetic Diversity and Designing Agriculture, School of Life Sciences, Fudan University, Shanghai, 200438, China
| | - Xiaoyan Wang
- State Key Laboratory of Genetic Engineering and Fudan Center for Genetic Diversity and Designing Agriculture, School of Life Sciences, Fudan University, Shanghai, 200438, China
| | - Xiaolei Wang
- State Key Laboratory of Genetic Engineering and Fudan Center for Genetic Diversity and Designing Agriculture, School of Life Sciences, Fudan University, Shanghai, 200438, China
| | - Xin Zhou
- State Key Laboratory of Genetic Engineering and Fudan Center for Genetic Diversity and Designing Agriculture, School of Life Sciences, Fudan University, Shanghai, 200438, China
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35
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Fan T, Yang W, Zeng X, Xu X, Xu Y, Fan X, Luo M, Tian C, Xia K, Zhang M. A Rice Autophagy Gene OsATG8b Is Involved in Nitrogen Remobilization and Control of Grain Quality. FRONTIERS IN PLANT SCIENCE 2020; 11:588. [PMID: 32582228 PMCID: PMC7287119 DOI: 10.3389/fpls.2020.00588] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Accepted: 04/20/2020] [Indexed: 05/03/2023]
Abstract
Enhancing nitrogen (N) use efficiency is a potential way to reduce excessive nitrogen application and increase yield. Autophagy is a conserved degradation system in the evolution of eukaryotic cells and plays an important role in plant development and stress response. Autophagic cores have two conjugation pathways that attach the product of autophagy-related gene 8 (ATG8) to phosphatidylethanolamine (PE) and ATG5 to ATG12, respectively, which then help with vesicle elongation and enclosure. Rice has six ATG8 genes, which have not been functionally confirmed so far. We identified the rice gene OsATG8b and characterized its role in N remobilization to affect grain quality by generating transgenic plants with its over-expression and knockdown. Our study confirmed the autophagy activity of OsATG8b through the complementation of the yeast autophagy-defective mutant scatg8 and by observation of autophagosome formation in rice. The autophagy activity is higher in OsATG8b-OE lines and lower in OsATG8b-RNAi than that in wild type (ZH11). 15N pulse-chase analysis revealed that OsATG8b-OE plants conferred higher N recycling efficiency to grains, while OsATG8b-RNAi transgenic plants exhibited lower N recycling efficiency and poorer grain quality. The autophagic role of OsATG8b was experimentally confirmed, and it was concluded that OsATG8b-mediated autophagy is involved in N recycling to grains and contributes to the grain quality, indicating that OsATG8b may be a potential gene for molecular breeding and cultivation of rice.
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Affiliation(s)
- Tian Fan
- School of Life Sciences, Guangzhou University, Guangzhou, China
- Innovation Academy for Seed Design, Guangdong Provincial Key Laboratory of Applied Botany, Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
| | - Wu Yang
- Innovation Academy for Seed Design, Guangdong Provincial Key Laboratory of Applied Botany, Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
| | - Xuan Zeng
- Innovation Academy for Seed Design, Guangdong Provincial Key Laboratory of Applied Botany, Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
| | - Xinlan Xu
- Innovation Academy for Seed Design, Guangdong Provincial Key Laboratory of Applied Botany, Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
| | - Yanling Xu
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, China
| | - Xiaorong Fan
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, China
| | - Ming Luo
- Innovation Academy for Seed Design, Guangdong Provincial Key Laboratory of Applied Botany, Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
| | - Changen Tian
- School of Life Sciences, Guangzhou University, Guangzhou, China
| | - Kuaifei Xia
- Innovation Academy for Seed Design, Guangdong Provincial Key Laboratory of Applied Botany, Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Guangzhou, China
| | - Mingyong Zhang
- Innovation Academy for Seed Design, Guangdong Provincial Key Laboratory of Applied Botany, Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Guangzhou, China
- *Correspondence: Mingyong Zhang,
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Zhen X, Xu F, Zhang W, Li N, Li X. Overexpression of rice gene OsATG8b confers tolerance to nitrogen starvation and increases yield and nitrogen use efficiency (NUE) in Arabidopsis. PLoS One 2019; 14:e0223011. [PMID: 31553788 PMCID: PMC6760796 DOI: 10.1371/journal.pone.0223011] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 09/11/2019] [Indexed: 12/11/2022] Open
Abstract
Nitrogen (N) is an important element required for plant growth and development, which also affects plant yield and quality. Autophagy, a conserved pathway in eukaryotes, degrades and recycles cellular components, thus playing an important role in N remobilization. However, only a few autophagy genes related to N remobilization in rice (Oryza sativa) have been reported. Here, we identified a core autophagy gene in rice, OsATG8b, with increased expression levels under N starvation conditions. It was investigated the function of OsATG8b by generating three independent homozygous 35S-OsATG8b transgenic Arabidopsis thaliana lines. The overexpression of OsATG8b significantly enhanced autophagic flux in the transgenic Arabidopsis plants. It was also showed that over-expressing OsATG8b promoted growth and development of Arabidopsis, in which the rosette leaves were larger than those of the wild type (WT), and the yield increased significantly by 25.25%. In addition, the transgenic lines accumulated more N in seeds than in the rosette leaves. Further examination revealed that overexpression of OsATG8b could effectively alleviate the growth inhibition of transgenic Arabidopsis under nitrogen (N) stress. N partitioning studies revealed that nitrogen-harvest index (NHI) and nitrogen use efficiency (NUE) were significantly increased in the transgenic Arabidopsis, as well as the 15N-tracer experiments revealing that the remobilization of N to seeds in the OsATG8b-overexpressing transgenic Arabidopsis was high and more than WT. Based on our findings, we consider OsATG8b to be a great candidate gene to increase NUE and yield, especially under suboptimal field conditions.
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Affiliation(s)
- Xiaoxi Zhen
- Rice Research Institute of Shenyang Agricultural University, Key Laboratory of Northern Japonica Rice Genetics and Breeding, Ministry of Education and Liaoning Province, Key Laboratory of Northeast Rice Biology and Genetics and Breeding, Ministry of Agriculture, Shenyang, China
| | - Fan Xu
- Rice Research Institute of Shenyang Agricultural University, Key Laboratory of Northern Japonica Rice Genetics and Breeding, Ministry of Education and Liaoning Province, Key Laboratory of Northeast Rice Biology and Genetics and Breeding, Ministry of Agriculture, Shenyang, China
- * E-mail: (FX); (WZ)
| | - Wenzhong Zhang
- Rice Research Institute of Shenyang Agricultural University, Key Laboratory of Northern Japonica Rice Genetics and Breeding, Ministry of Education and Liaoning Province, Key Laboratory of Northeast Rice Biology and Genetics and Breeding, Ministry of Agriculture, Shenyang, China
- * E-mail: (FX); (WZ)
| | - Nan Li
- Shen Yang Product Quality Supervision and Inspection Institute, Shenyang, China
| | - Xin Li
- Rice Research Institute of Shenyang Agricultural University, Key Laboratory of Northern Japonica Rice Genetics and Breeding, Ministry of Education and Liaoning Province, Key Laboratory of Northeast Rice Biology and Genetics and Breeding, Ministry of Agriculture, Shenyang, China
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Pottier M, Dumont J, Masclaux-Daubresse C, Thomine S. Autophagy is essential for optimal translocation of iron to seeds in Arabidopsis. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:859-869. [PMID: 30395253 PMCID: PMC6363094 DOI: 10.1093/jxb/ery388] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 10/23/2018] [Indexed: 05/18/2023]
Abstract
Micronutrient deficiencies affect a large part of the world's population. These deficiencies are mostly due to the consumption of grains with insufficient content of iron (Fe) or zinc (Zn). Both de novo uptake by roots and recycling from leaves may provide seeds with nutrients. Autophagy, which is a conserved mechanism for nutrient recycling in eukaryotes, was shown to be involved in nitrogen remobilization to seeds. Here, we have investigated the role of this mechanism in micronutrient translocation to seeds. We found that Arabidopsis thaliana plants impaired in autophagy display defects in nutrient remobilization to seeds. In the atg5-1 mutant, which is completely defective in autophagy, the efficiency of Fe translocation from vegetative organs to seeds was severely decreased even when Fe was provided during seed formation. Combining atg5-1 with the sid2 mutation that counteracts premature senescence associated with autophagy deficiency and using 57Fe pulse labeling, we propose a two-step mechanism in which Fe taken up de novo during seed formation is first accumulated in vegetative organs and subsequently remobilized to seeds. Finally, we show that translocation of Zn and manganese (Mn) to seeds is also dependent on autophagy. Fine-tuning autophagy during seed formation opens up new possibilities to improve micronutrient remobilization to seeds.
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Affiliation(s)
- Mathieu Pottier
- Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Avenue de la Terrasse, 91198 Gif-sur-Yvette, France
- Present address: InBioS, PhytoSYSTEMS, Laboratory of Plant Physiology, University of Liège, Sart Tilman Campus Quartier Vallée 1, Chemin de la Vallée 4, B-4000, Liège, Belgium
| | - Jean Dumont
- UT2A, Hélioparc Pau Pyrénées, 2, avenue du président Angot, 64053 Pau, France
| | - Céline Masclaux-Daubresse
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, 78000, Versailles, France
| | - Sébastien Thomine
- Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Avenue de la Terrasse, 91198 Gif-sur-Yvette, France
- Correspondence:
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38
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Chen Q, Soulay F, Saudemont B, Elmayan T, Marmagne A, Masclaux-Daubresse CL. Overexpression of ATG8 in Arabidopsis Stimulates Autophagic Activity and Increases Nitrogen Remobilization Efficiency and Grain Filling. PLANT & CELL PHYSIOLOGY 2019; 60:343-352. [PMID: 30407574 DOI: 10.1093/pcp/pcy214] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Accepted: 10/27/2018] [Indexed: 05/20/2023]
Abstract
Autophagy knock-out mutants in maize and in Arabidopsis are impaired in nitrogen (N) recycling and exhibit reduced levels of N remobilization to their seeds. It is thus impoortant to determine whether higher autophagy activity could, conversely, improve N remobilization efficiency and seed protein content, and under what circumstances. As the autophagy machinery involves many genes amongst which 18 are important for the core machinery, the choice of which AUTOPHAGY (ATG) gene to manipulate to increase autophagy was examined. We choose ATG8 overexpression since it has been shown that this gene could increase autophagosome size and autophagic activity in yeast. The results we report here are original as they show for the first time that increasing ATG8 gene expression in plants increases autophagosome number and promotes autophagy activity. More importantly, our data demonstrate that, when cultivated under full nitrate conditions, known to repress N remobilization due to sufficient N uptake from the soil, N remobilization efficiency can nevertheless be sharply and significantly increased by overexpressing ATG8 genomic sequences under the control of the ubiquitin promoter. We show that overexpressors have improved seed N% and at the same time reduced N waste in their dry remains. In addition, we show that overexpressing ATG8 does not modify vegetative biomass or harvest index, and thus does not affect plant development.
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Affiliation(s)
- Qinwu Chen
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Universit� Paris-Saclay, Versailles, France
| | - Fabienne Soulay
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Universit� Paris-Saclay, Versailles, France
| | - Baptiste Saudemont
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Universit� Paris-Saclay, Versailles, France
| | - Taline Elmayan
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Universit� Paris-Saclay, Versailles, France
| | - Anne Marmagne
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Universit� Paris-Saclay, Versailles, France
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39
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Zhu K, Tao H, Xu S, Li K, Zafar S, Cao W, Yang Y. Overexpression of salt-induced protein (salT) delays leaf senescence in rice. Genet Mol Biol 2019; 42:80-86. [PMID: 30730528 PMCID: PMC6428123 DOI: 10.1590/1678-4685-gmb-2017-0365] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Accepted: 04/27/2018] [Indexed: 02/06/2023] Open
Abstract
Senescence, a highly programmed process, largely determines yield and quality of crops. However, knowledge about the onset and progression of leaf senescence in crop plants is still limited. Here, we report that salt-induced protein (salT), a new gene, may be involved in leaf senescence. Overexpressing salT could prolong the duration of leaves with higher concentrations of chlorophyll compared with the wild type. Moreover, overexpression of salT could delay the senescence of rice leaves though the inhibition of senescence associated genes (SAGs). Overall, the characterization of salT suggested that it is a new gene affecting the leaf senescence induced by natural and dark conditions.
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Affiliation(s)
- Keming Zhu
- Institute of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu, People's Republic of China
| | - Huimin Tao
- Institute of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu, People's Republic of China
| | - Shuo Xu
- Institute of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu, People's Republic of China
| | - Kaixia Li
- Institute of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu, People's Republic of China
| | - Sundus Zafar
- Institute of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu, People's Republic of China
| | - Wei Cao
- Institute of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu, People's Republic of China
| | - Yanhua Yang
- Institute of Life Sciences, Jiangsu University, Zhenjiang, Jiangsu, People's Republic of China
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40
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Perchlik M, Tegeder M. Leaf Amino Acid Supply Affects Photosynthetic and Plant Nitrogen Use Efficiency under Nitrogen Stress. PLANT PHYSIOLOGY 2018; 178:174-188. [PMID: 30082496 PMCID: PMC6130036 DOI: 10.1104/pp.18.00597] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 07/23/2018] [Indexed: 05/18/2023]
Abstract
The coordinated distribution of nitrogen to source leaves and sinks is essential for supporting leaf metabolism while also supplying sufficient nitrogen to seeds for development. This study aimed to understand how regulated amino acid allocation to leaves affects photosynthesis and overall plant nitrogen use efficiency in Arabidopsis (Arabidopsis thaliana) and how soil nitrogen availability influences these processes. Arabidopsis plants with a knockout of AAP2, encoding an amino acid permease involved in xylem-to-phloem transfer of root-derived amino acids, were grown in low-, moderate-, and high-nitrogen environments. We analyzed nitrogen allocation to shoot tissues, photosynthesis, and photosynthetic and plant nitrogen use efficiency in these knockout plants. Our results demonstrate that, independent of nitrogen conditions, aap2 plants allocate more nitrogen to leaves than wild-type plants. Increased leaf nitrogen supply positively affected chlorophyll and Rubisco levels, photosynthetic nitrogen use efficiency, and carbon assimilation and transport to sinks. The aap2 plants outperformed wild-type plants with respect to growth, seed yield and carbon storage pools, and nitrogen use efficiency in both high and deficient nitrogen environments. Overall, this study demonstrates that increasing nitrogen allocation to leaves represents an effective strategy for improving carbon fixation and photosynthetic nitrogen use efficiency. The results indicate that an optimized coordination of nitrogen and carbon partitioning processes is critical for high oilseed production in Arabidopsis, including in plants exposed to limiting nitrogen conditions.
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Affiliation(s)
- Molly Perchlik
- School of Biological Sciences, Washington State University, Pullman, Washington 99164
| | - Mechthild Tegeder
- School of Biological Sciences, Washington State University, Pullman, Washington 99164
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Moison M, Marmagne A, Dinant S, Soulay F, Azzopardi M, Lothier J, Citerne S, Morin H, Legay N, Chardon F, Avice JC, Reisdorf-Cren M, Masclaux-Daubresse C. Three cytosolic glutamine synthetase isoforms localized in different-order veins act together for N remobilization and seed filling in Arabidopsis. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:4379-4393. [PMID: 29873769 PMCID: PMC6093384 DOI: 10.1093/jxb/ery217] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 05/30/2018] [Indexed: 05/22/2023]
Abstract
Glutamine synthetase (GS) is central for ammonium assimilation and consists of cytosolic (GS1) and chloroplastic (GS2) isoenzymes. During plant ageing, GS2 protein decreases due to chloroplast degradation, and GS1 activity increases to support glutamine biosynthesis and N remobilization from senescing leaves. The role of the different Arabidopsis GS1 isoforms in nitrogen remobilization was examined using 15N tracing experiments. Only the gln1;1-gln1;2-gln1;3 triple-mutation affecting the three GLN1;1, GLN1;2, and GLN1;3 genes significantly reduced N remobilization, total seed yield, individual seed weight, harvest index, and vegetative biomass. The triple-mutant accumulated a large amount of ammonium that could not be assimilated by GS1. Alternative ammonium assimilation through asparagine biosynthesis was increased and was related to higher ASN2 asparagine synthetase transcript levels. The GS2 transcript, protein, and activity levels were also increased to compensate for the lack of GS1-related glutamine biosynthesis. Localization of the different GLN1 genes showed that they were all expressed in the phloem companion cells but in veins of different order. Our results demonstrate that glutamine biosynthesis for N-remobilization occurs in veins of all orders (major and minor) in leaves, it is mainly catalysed by the three major GS1 isoforms (GLN1;1, GLN1;2, and GLN1;3), and it is alternatively supported by AS2 in the veins and GS2 in the mesophyll cells.
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Affiliation(s)
- Michael Moison
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Anne Marmagne
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Sylvie Dinant
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Fabienne Soulay
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Marianne Azzopardi
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Jérémy Lothier
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
- Université de Versailles Saint Quentin en Yvelines, Université Paris Saclay, Versailles, France
| | - Sylvie Citerne
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Halima Morin
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Nicolas Legay
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
- Université de Versailles Saint Quentin en Yvelines, Université Paris Saclay, Versailles, France
| | - Fabien Chardon
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Jean-Christophe Avice
- UCBN, INRA, UMR INRA-UBCN Ecophysiologie Végétale, Agronomie and Nutrition N.C.S., Université de Caen Normandie, Caen, France
| | - Michèle Reisdorf-Cren
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
- Université de Versailles Saint Quentin en Yvelines, Université Paris Saclay, Versailles, France
| | - Céline Masclaux-Daubresse
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
- Correspondence:
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42
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Havé M, Balliau T, Cottyn-Boitte B, Dérond E, Cueff G, Soulay F, Lornac A, Reichman P, Dissmeyer N, Avice JC, Gallois P, Rajjou L, Zivy M, Masclaux-Daubresse C. Increases in activity of proteasome and papain-like cysteine protease in Arabidopsis autophagy mutants: back-up compensatory effect or cell-death promoting effect? JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:1369-1385. [PMID: 29281085 PMCID: PMC6037082 DOI: 10.1093/jxb/erx482] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Accepted: 12/14/2017] [Indexed: 05/18/2023]
Abstract
Autophagy is essential for protein degradation, nutrient recycling, and nitrogen remobilization. Autophagy is induced during leaf ageing and in response to nitrogen starvation, and is known to play a fundamental role in nutrient recycling for remobilization and seed filling. Accordingly, ageing leaves of Arabidopsis autophagy mutants (atg) have been shown to over-accumulate proteins and peptides, possibly because of a reduced protein degradation capacity. Surprisingly, atg leaves also displayed higher protease activities. The work reported here aimed at identifying the nature of the proteases and protease activities that accumulated differentially (higher or lower) in the atg mutants. Protease identification was performed using shotgun LC-MS/MS proteome analyses and activity-based protein profiling (ABPP). The results showed that the chloroplast FTSH (FILAMENTATION TEMPERATURE SENSITIVE H) and DEG (DEGRADATION OF PERIPLASMIC PROTEINS) proteases and several extracellular serine proteases [subtilases (SBTs) and serine carboxypeptidase-like (SCPL) proteases] were less abundant in atg5 mutants. By contrast, proteasome-related proteins and cytosolic or vacuole cysteine proteases were more abundant in atg5 mutants. Rubisco degradation assays and ABPP showed that the activities of proteasome and papain-like cysteine protease were increased in atg5 mutants. Whether these proteases play a back-up role in nutrient recycling and remobilization in atg mutants or act to promote cell death is discussed in relation to their accumulation patterns in the atg5 mutant compared with the salicylic acid-depleted atg5/sid2 double-mutant, and in low nitrate compared with high nitrate conditions. Several of the proteins identified are indeed known as senescence- and stress-related proteases or as spontaneous cell-death triggering factors.
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Affiliation(s)
- Marien Havé
- INRA-AgroParisTech, Institut Jean-Pierre Bourgin, France
| | - Thierry Balliau
- UMR GQE- le Moulon, INRA, Université Paris-Sud, CNRS, AgroParisTech, Université Paris-Saclay, France
| | | | - Emeline Dérond
- INRA-AgroParisTech, Institut Jean-Pierre Bourgin, France
| | - Gwendal Cueff
- INRA-AgroParisTech, Institut Jean-Pierre Bourgin, France
| | | | - Aurélia Lornac
- UCBN, INRA, UMR INRA-UBCN 950 Ecophysiologie Végétale, Agronomie & Nutrition N.C.S., Université de Caen Normandie, France
| | - Pavel Reichman
- Independent Junior Research Group on Protein Recognition and Degradation, Leibniz Institute of Plant Biochemistry (IPB), Weinberg 3, Halle (Saale), Germany and Science Campus Halle – Plant-based Bioeconomy, Germany
| | - Nico Dissmeyer
- Independent Junior Research Group on Protein Recognition and Degradation, Leibniz Institute of Plant Biochemistry (IPB), Weinberg 3, Halle (Saale), Germany and Science Campus Halle – Plant-based Bioeconomy, Germany
| | - Jean-Christophe Avice
- UCBN, INRA, UMR INRA-UBCN 950 Ecophysiologie Végétale, Agronomie & Nutrition N.C.S., Université de Caen Normandie, France
| | - Patrick Gallois
- School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, UK
| | - Loïc Rajjou
- INRA-AgroParisTech, Institut Jean-Pierre Bourgin, France
| | - Michel Zivy
- UMR GQE- le Moulon, INRA, Université Paris-Sud, CNRS, AgroParisTech, Université Paris-Saclay, France
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Di Berardino J, Marmagne A, Berger A, Yoshimoto K, Cueff G, Chardon F, Masclaux-Daubresse C, Reisdorf-Cren M. Autophagy controls resource allocation and protein storage accumulation in Arabidopsis seeds. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:1403-1414. [PMID: 29378007 PMCID: PMC6018931 DOI: 10.1093/jxb/ery012] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Accepted: 01/16/2018] [Indexed: 05/18/2023]
Abstract
Autophagy is essential for nutrient recycling and plays a fundamental role in seed production and grain filling in plants. Autophagy participates in nitrogen remobilization at the whole-plant level, and the seeds of autophagy mutants present abnormal C and N contents relative to wild-type (WT) plants. It is well known that autophagy (ATG) genes are induced in leaves during senescence; however, expression of such genes in seeds has not yet been reported. In this study we show that most of the ATG genes are induced during seed maturation in Arabidopsis siliques. Promoter-ATG8f::UIDA and promoter-ATG8f::GFP fusions showed the strong expression of ATG8f in the phloem companion cells of pericarps and the funiculus, and in the embryo. Expression was especially strong at the late stages of development. The presence of many GFP-ATG8 pre-autophagosomal structures and autophagosomes confirmed the presence of autophagic activity in WT seed embryos. Seeds of atg5 and WT plants grown under low- or high-nitrate conditions were analysed. Nitrate-independent phenotypes were found with higher seed abortion in atg5 and early browing, higher total protein concentrations in the viable seeds of this mutant as compared to the WT. The higher total protein accumulation in atg5 viable seeds was significant from early developmental stages onwards. In addition, relatively low and early accumulation of 12S globulins were found in atg5 seeds. These features led us to the conclusion that atg5 seed development is accelerated and that the protein storage deposition pathway is somehow abnormal or incomplete.
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Affiliation(s)
- Julien Di Berardino
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
- Université Paris-Sud, Université Paris-Saclay, Orsay, France
| | - Anne Marmagne
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Adeline Berger
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Kohki Yoshimoto
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Gwendal Cueff
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Fabien Chardon
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Céline Masclaux-Daubresse
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Michèle Reisdorf-Cren
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
- Université de Versailles Saint Quentin en Yvelines, Université Paris Saclay, Versailles, France
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44
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Clément G, Moison M, Soulay F, Reisdorf-Cren M, Masclaux-Daubresse C. Metabolomics of laminae and midvein during leaf senescence and source-sink metabolite management in Brassica napus L. leaves. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:891-903. [PMID: 28992054 PMCID: PMC5853214 DOI: 10.1093/jxb/erx253] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Accepted: 07/03/2017] [Indexed: 05/18/2023]
Abstract
Leaf senescence is a long developmental process important for nutrient management and for source to sink remobilization. Constituents of the mesophyll cells are progressively degraded to provide nutrients to the rest of the plant. Up to now, studies on leaf senescence have not paid much attention to the role of the different leaf tissues. In the present study, we dissected leaf laminae from the midvein to perform metabolite profiling. The laminae mesophyll cells are the source of nutrients, and in C3 plants they contain Rubisco as the most important nitrogen storage pool. Veins, rich in vasculature, are the place where all the nutrients are translocated, and sometimes interconverted, before being exported through the phloem or the xylem. The different metabolic changes we observed in laminae and midvein with ageing support the idea that the senescence programme in these two tissues is different. Important accumulations of metabolites in the midvein suggest that nutrient translocations from source leaves to sinks are mainly controlled at this level. Carbon and nitrogen long-distance molecules such as fructose, glucose, aspartate, and asparagine were more abundant in the midvein than in laminae. In contrast, sucrose, glutamate, and aspartate were more abundant in laminae. The concentrations of tricarboxylic acid (TCA) compounds were also lower in the midvein than in laminae. Since nitrogen remobilization increased under low nitrate supply, plants were grown under two nitrate concentrations. The results revealed that the senescence-related differences were mostly similar under low and high nitrate conditions except for some pathways such as the TCA cycle.
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Affiliation(s)
- Gilles Clément
- INRA-AgroParisTech, Institut Jean-Pierre Bourgin, Saclay Plant Sciences, Versailles, France
| | - Michaël Moison
- INRA-AgroParisTech, Institut Jean-Pierre Bourgin, Saclay Plant Sciences, Versailles, France
| | - Fabienne Soulay
- INRA-AgroParisTech, Institut Jean-Pierre Bourgin, Saclay Plant Sciences, Versailles, France
| | - Michèle Reisdorf-Cren
- INRA-AgroParisTech, Institut Jean-Pierre Bourgin, Saclay Plant Sciences, Versailles, France
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45
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Tegeder M, Masclaux-Daubresse C. Source and sink mechanisms of nitrogen transport and use. THE NEW PHYTOLOGIST 2018; 217:35-53. [PMID: 29120059 DOI: 10.1111/nph.14876] [Citation(s) in RCA: 303] [Impact Index Per Article: 50.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 09/09/2017] [Indexed: 05/03/2023]
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.
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Affiliation(s)
- Mechthild Tegeder
- School of Biological Sciences, Washington State University, Pullman, WA, 99164-4236, USA
| | - Céline Masclaux-Daubresse
- INRA-AgroParisTech, Institut Jean-Pierre Bourgin, UMR1318, ERL CNRS 3559, Saclay Plant Sciences, Versailles, France
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46
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Demirbas A, Groszman K, Pazmiño‐Hernandez M, Vanegas DC, Welt B, Hondred JA, Garland NT, Claussen JC, McLamore ES. Cryoconcentration of flavonoid extract for enhanced biophotovoltaics and pH sensitive thin films. Biotechnol Prog 2017; 34:206-217. [DOI: 10.1002/btpr.2557] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2017] [Revised: 08/10/2017] [Indexed: 01/10/2023]
Affiliation(s)
- A. Demirbas
- Agricultural and Biological EngineeringInstitute of Food and Agricultural Sciences, University of FloridaGainesville FL
| | - K. Groszman
- Department of Computational and Applied MathematicsRice UniversityHouston TX
| | - M. Pazmiño‐Hernandez
- Agricultural and Biological EngineeringInstitute of Food and Agricultural Sciences, University of FloridaGainesville FL
| | - D. C. Vanegas
- Food Engineering DepartmentUniversidad del ValleCali Colombia
| | - B. Welt
- Agricultural and Biological EngineeringInstitute of Food and Agricultural Sciences, University of FloridaGainesville FL
| | - J. A. Hondred
- Mechanical Engineering DepartmentIowa State UniversityIowa City IA
| | - N. T. Garland
- Mechanical Engineering DepartmentIowa State UniversityIowa City IA
| | - J. C. Claussen
- Mechanical Engineering DepartmentIowa State UniversityIowa City IA
| | - E. S. McLamore
- Agricultural and Biological EngineeringInstitute of Food and Agricultural Sciences, University of FloridaGainesville FL
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47
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Perchlik M, Tegeder M. Improving Plant Nitrogen Use Efficiency through Alteration of Amino Acid Transport Processes. PLANT PHYSIOLOGY 2017; 175:235-247. [PMID: 28733388 PMCID: PMC5580756 DOI: 10.1104/pp.17.00608] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 07/18/2017] [Indexed: 05/08/2023]
Abstract
Improving the efficiency of nitrogen (N) uptake and utilization in plants could potentially increase crop yields while reducing N fertilization and, subsequently, environmental pollution. Within most plants, N is transported primarily as amino acids. In this study, pea (Pisum sativum) plants overexpressing AMINO ACID PERMEASE1 (AAP1) were used to determine if and how genetic manipulation of amino acid transport from source to sink affects plant N use efficiency. The modified plants were grown under low, moderate, or high N fertilization regimes. The results showed that, independent of the N nutrition, the engineered plants allocate more N via the vasculature to the shoot and seeds and produce more biomass and higher seed yields than wild-type plants. Dependent on the amount of N supplied, the AAP1-overexpressing plants displayed improved N uptake or utilization efficiency, or a combination of the two. They also showed significantly increased N use efficiency in N-deficient as well as in N-rich soils and, impressively, required half the amount of N to produce as many fruits and seeds as control plants. Together, these data support that engineering N allocation from source to sink presents an effective strategy to produce crop plants with improved productivity as well as N use efficiency in a range of N environments.
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Affiliation(s)
- Molly Perchlik
- School of Biological Sciences, Washington State University, Pullman, Washington 99164
| | - Mechthild Tegeder
- School of Biological Sciences, Washington State University, Pullman, Washington 99164
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48
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Kuang Q, Zhang S, Wu P, Chen Y, Li M, Jiang H, Wu G. Global gene expression analysis of the response of physic nut (Jatropha curcas L.) to medium- and long-term nitrogen deficiency. PLoS One 2017; 12:e0182700. [PMID: 28817702 PMCID: PMC5560629 DOI: 10.1371/journal.pone.0182700] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2017] [Accepted: 07/21/2017] [Indexed: 11/25/2022] Open
Abstract
Jatropha curcas L. is an important biofuel plant with excellent tolerance of barren environments. However, studies on the regulatory mechanisms that operate in this plant in response to nitrogen (N) shortage are scarce. In this study, genome-wide transcriptional profiles of the roots and leaves of 8-week old physic nut seedlings were analyzed after 2 and 16 days of N starvation. Enrichment results showed that genes associated with N metabolism, processing and regulation of RNA, and transport predominated among those showing alterations in expression. Genes encoding transporter families underwent major changes in expression in both roots and leaves; in particular, those with roles in ammonia, amino acid and peptide transport were generally up-regulated after long-term starvation, while AQUAPORIN genes, whose products function in osmoregulation, were down-regulated. We also found that ASPARA−GINASE B1 and SARCOSINE OXIDASE genes were up-regulated in roots and leaves after 2 and 16 d N starvation. Genes associated with ubiquitination-mediated protein degradation were significantly up-regulated. In addition, genes in the JA biosynthesis pathway were strongly activated while expression of those in GA signaling was inhibited in leaves. We showed that four major classes of genes, those with roles in N uptake, N reutilization, C/N ratio balance, and cell structure and synthesis, were particularly influenced by long-term N limitation. Our discoveries may offer clues to the molecular mechanisms that regulate N reallocation and reutilization so as to maintain or increase plant performance even under adverse environmental conditions.
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Affiliation(s)
- Qi Kuang
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
- Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
| | - Sheng Zhang
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
- Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
- University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Pingzhi Wu
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
- Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
| | - Yaping Chen
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
- Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
| | - Meiru Li
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
- Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
| | - Huawu Jiang
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
- Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
- * E-mail: (HWJ); (GJW)
| | - Guojiang Wu
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
- Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
- * E-mail: (HWJ); (GJW)
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49
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Gelli M, Konda AR, Liu K, Zhang C, Clemente TE, Holding DR, Dweikat IM. Validation of QTL mapping and transcriptome profiling for identification of candidate genes associated with nitrogen stress tolerance in sorghum. BMC PLANT BIOLOGY 2017; 17:123. [PMID: 28697783 PMCID: PMC5505042 DOI: 10.1186/s12870-017-1064-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Accepted: 06/25/2017] [Indexed: 05/10/2023]
Abstract
BACKGROUND Quantitative trait loci (QTLs) detected in one mapping population may not be detected in other mapping populations at all the time. Therefore, before being used for marker assisted breeding, QTLs need to be validated in different environments and/or genetic backgrounds to rule out statistical anomalies. In this regard, we mapped the QTLs controlling various agronomic traits in a recombinant inbred line (RIL) population in response to Nitrogen (N) stress and validated these with the reported QTLs in our earlier study to find the stable and consistent QTLs across populations. Also, with Illumina RNA-sequencing we checked the differential expression of gene (DEG) transcripts between parents and pools of RILs with high and low nitrogen use efficiency (NUE) and overlaid these DEGs on to the common validated QTLs to find candidate genes associated with N-stress tolerance in sorghum. RESULTS An F7 RIL population derived from a cross between CK60 (N-stress sensitive) and San Chi San (N-stress tolerant) inbred sorghum lines was used to map QTLs for 11 agronomic traits tested under different N-levels. Composite interval mapping analysis detected a total of 32 QTLs for 11 agronomic traits. Validation of these QTLs revealed that of the detected, nine QTLs from this population were consistent with the reported QTLs in earlier study using CK60/China17 RIL population. The validated QTLs were located on chromosomes 1, 6, 7, 8, and 9. In addition, root transcriptomic profiling detected 55 and 20 differentially expressed gene (DEG) transcripts between parents and pools of RILs with high and low NUE respectively. Also, overlay of these DEG transcripts on to the validated QTLs found candidate genes transcripts for NUE and also showed the expected differential expression. For example, DEG transcripts encoding Lysine histidine transporter 1 (LHT1) had abundant expression in San Chi San and the tolerant RIL pool, whereas DEG transcripts encoding seed storage albumin, transcription factor IIIC (TFIIIC) and dwarfing gene (DW2) encoding multidrug resistance-associated protein-9 homolog showed abundant expression in CK60 parent, similar to earlier study. CONCLUSIONS The validated QTLs among different mapping populations would be the most reliable and stable QTLs across germplasm. The DEG transcripts found in the validated QTL regions will serve as future candidate genes for enhancing NUE in sorghum using molecular approaches.
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Affiliation(s)
- Malleswari Gelli
- Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE, 68583, USA
| | - Anji Reddy Konda
- Department of Biochemistry, University of Nebraska, Lincoln, NE, 68588, USA
- Center for Plant Science Innovation, University of Nebraska, Lincoln, NE, 68588, USA
| | - Kan Liu
- Center for Plant Science Innovation, University of Nebraska, Lincoln, NE, 68588, USA
- School of Biological Sciences, University of Nebraska, Lincoln, NE, 68588, USA
| | - Chi Zhang
- Center for Plant Science Innovation, University of Nebraska, Lincoln, NE, 68588, USA
- School of Biological Sciences, University of Nebraska, Lincoln, NE, 68588, USA
| | - Thomas E Clemente
- Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE, 68583, USA
- Center for Plant Science Innovation, University of Nebraska, Lincoln, NE, 68588, USA
| | - David R Holding
- Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE, 68583, USA
- Center for Plant Science Innovation, University of Nebraska, Lincoln, NE, 68588, USA
| | - Ismail M Dweikat
- Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE, 68583, USA.
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Santiago JP, Tegeder M. Implications of nitrogen phloem loading for carbon metabolism and transport during Arabidopsis development. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2017; 59:409-421. [PMID: 28296149 DOI: 10.1111/jipb.12533] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2017] [Accepted: 03/09/2017] [Indexed: 05/03/2023]
Abstract
Metabolite transport processes and primary metabolism are highly interconnected. This study examined the importance of source-to-sink nitrogen partitioning, and associated nitrogen metabolism for carbon capture, transport and usage. Specifically, Arabidopsis aap8 (AMINO ACID PERMEASE 8) mutant lines were analyzed to resolve the consequences of reduced amino acid phloem loading for source leaf carbon metabolism, sucrose phloem transport and sink development during vegetative and reproductive growth phase. Results showed that decreased amino acid transport had a negative effect on sink development of aap8 lines throughout the life cycle, leading to an overall decrease in plant biomass. During vegetative stage, photosynthesis and carbohydrate levels were decreased in aap8 leaves, while expression of carbon metabolism and transport genes, as well as sucrose phloem transport were not affected despite reduced sink strength. However, when aap8 plants transitioned to reproductive phase, carbon fixation and assimilation as well as sucrose partitioning to siliques were strongly decreased. Overall, this work demonstrates that phloem loading of nitrogen has varying implications for carbon fixation, assimilation and source-to-sink allocation depending on plant growth stage. It further suggests alterations in source-sink relationships, and regulation of carbon metabolism and transport by sink strength in a development-dependent manner.
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Affiliation(s)
- James P Santiago
- School of Biological Sciences and Molecular Plant Sciences Graduate Program, Washington State University, Pullman, Washington 99164, USA
| | - Mechthild Tegeder
- School of Biological Sciences and Molecular Plant Sciences Graduate Program, Washington State University, Pullman, Washington 99164, USA
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