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1. Water Use Efficiency (WUE) across scales: From genes to landscape

Author

Vincent Vadez, Raphael Pilloni, Alexandre Grondin, Amir Hajjarpoor, Hatem Belhouchette, Youssef Brouziyne, Ghani Chehbouni, Mohamed Hakim Kharrou, Rim Zitouna-Chebbi, Insaf Mekki, Jérôme Molénat, Frédéric Jacob, Jérôme Bossuet, Diversité, adaptation, développement des plantes (UMR DIADE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Université de Montpellier (UM), International Crops Research Institute for the Semi-Arid Tropics [Inde] (ICRISAT), Consultative Group on International Agricultural Research [CGIAR] (CGIAR), Centre d'Etude Regional Pour l'Amelioration de l'Adaptation A la Secheresse (CERAAS), Institut Sénégalais de Recherches Agricoles [Dakar] (ISRA), LMI Adaptation des Plantes et microorganismes associés aux Stress Environnementaux [Dakar] (LAPSE), Institut de Recherche pour le Développement (IRD), Agrosystèmes Biodiversifiés (UMR ABSys), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre International de Hautes Etudes Agronomiques Méditerranéennes - Institut Agronomique Méditerranéen de Montpellier (CIHEAM-IAMM), Centre International de Hautes Études Agronomiques Méditerranéennes (CIHEAM)-Centre International de Hautes Études Agronomiques Méditerranéennes (CIHEAM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), International Water Management Institute, MENA Office (IWMI), Université Mohammed VI Polytechnique [Ben Guerir] (UM6P), International Water Research Institute (IWRI), Institut National de Recherche en Génie Rural Eaux et Forêts (INRGREF), Ecole Nationale du Génie Rural, des Eaux et des Forêts (ENGREF)-Institution de la Recherche et de l'Enseignement Supérieur Agricoles [Tunis] (IRESA), Laboratoire d'étude des Interactions Sol - Agrosystème - Hydrosystème (UMR LISAH), Institut de Recherche pour le Développement (IRD)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier, Independent Consultant, The paper was written and supported under the Make Our Planet Great Again (MOPGA) ICARUS project (Improve Crops in Arid Regions and future climates) funded by the Agence Nationale de la Recherche (ANR, grant ANR-17-MPGA-0011), and written in the scope and with the support of the ClimBeR initiative of the CGIAR, itself supported by the France-CGIAR action plan on Climate Change., ANR-17-MPGA-0011,ICARUS,Improve Crops in Arid Regions and future climates(2017), Centre International de Hautes Etudes Agronomiques Méditerranéennes - Institut Agronomique Méditerranéen de Montpellier (CIHEAM-IAMM), Centre International de Hautes Études Agronomiques Méditerranéennes (CIHEAM), and Institut de Recherche pour le Développement (IRD)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro - Montpellier SupAgro

Subjects
CLIMATIC CHANGE, Physiology, PAYSAGE AGRICOLE, WATER MANAGEMENT, MODELS, [SDV.SA.AGRO]Life Sciences [q-bio]/Agricultural sciences/Agronomy, CROPPING SYSTEMS, UTILISATION DE L'EAU, Plant Science, drought, GESTION DES EAUX, EXPLOITATION AGRICOLE, AGRICULTURAL LANDSCAPE, MODELE, FARMS, farming systems, WUE, ECHELLE SPATIALE, SECHERESSE, [SDE.IE]Environmental Sciences/Environmental Engineering, SYSTEME DE CULTURE, TRANSPIRATION, [SDV.SA.AEP]Life Sciences [q-bio]/Agricultural sciences/Agriculture, economy and politics, food security, WATER USE, landscape, WATER USE EFFICIENCY, landscapewater use efficiency, EFFICIENCE D'UTILISATION DE L'EAU, climate change, CHANGEMENT CLIMATIQUE, breeding, SPATIAL SCALE, farming system, crop breeding, [SDV.EE.BIO]Life Sciences [q-bio]/Ecology, environment/Bioclimatology
Abstract

International audience; Highlights:This paper reviews ways to improve water use efficiency beyond the plant level, across time and space scales, from cells, organs, and plants, to field, farm, and landscape.Abstract:Water scarcity will be one of the main issues of the 21 st century, because of competing needs between civil, industrial, and agriculture use. While agriculture is the largest user of water, its share is bound to decrease as societies develop. Clearly, agriculture needs to become more water efficient. Improving water use efficiency (WUE) at the plant level is important although there is a long way into translating this at the farm/landscape level. As we move up from a cell/organ/plant scale to more integrated scales such as plot, field, farm system, and landscape, other factors need to be considered, including trade-offs, to possibly improve WUE. These include choices of crop variety/species, farm management, landscape design, infrastructure development, ecosystem functions, where human decisions matter. This review is a cross-disciplinary attempt to analyze ways to address WUE at these different scales where metrics of analysis are defined and trade-offs considered. The equations in this perspective paper use similar metrics across scales for an easier connection and are developed to highlight which levers, at different scales, can improve WUE. We also refer to models operating at these different scales to assess WUE. While our entry point is plants and crops, we scale up the analysis of WUE to farm systems and landscapes.

Published
2023

2. Independent and Joint‐<scp>GWAS</scp>for growth traits inEucalyptusby assembling genome‐wide data for 3373 individuals across four breeding populations

Author

Bárbara S. F. Müller, Janeo Eustáquio de Almeida Filho, Aurélio Mendes Aguiar, Alexandre Alves Missiaggia, Orzenil B. Silva-Junior, Dario Grattapaglia, Leandro G. Neves, Elizabete Keiko Takahashi, Bruno Marco de Lima, Carla Garcia, Matias Kirst, Salvador A. Gezan, BÁRBARA S. F. MULLER, UNB, ORZENIL BONFIM DA SILVA JUNIOR, Cenargen, LEANDRO G. NEVES, RAPID GENOMICS LLC, USA, DARIO GRATTAPAGLIA, Cenargen., JANEO E. DE ALMEIDA FILHO, UENF, BRUNO M. LIMA, FIBRIA S.A. TECHNOLOGY CENTER, CARLA C. GARCIA, INTERNATIONAL PAPER OF BRAZIL, ALEXANDRE MISSIAGGIA, FIBRIA S.A. TECHNOLOGY CENTER, AURELIO M. AGUIAR, FIBRIA S.A. TECHNOLOGY CENTER, ELIZABETE TAKAHASHI, CELULOSE NIPO-BRASILEIRA (CENIBRA) S.A., MATIAS KIRST, UNIVERSITY OF FLORIDA, USA, and SALVADOR A. GEZAN, UNIVERSITY OF FLORIDA, USA

Subjects
musculoskeletal diseases, 0106 biological sciences, 0301 basic medicine, Physiology, Population, Inheritance Patterns, Single-nucleotide polymorphism, Genome-wide association study, Plant Science, Biology, Polymorphism, Single Nucleotide, 01 natural sciences, Genome, Linkage Disequilibrium, 03 medical and health sciences, Quantitative Trait, Heritable, High-throughput SNP genotyping, Joint-GWAS, Regional heritability mapping (RHM), SNP, education, Genetic association, Principal Component Analysis, Eucalyptus, education.field_of_study, Genome-wide association study (GWAS), Heritability, Plant Breeding, Meta-analysis, 030104 developmental biology, Evolutionary biology, Tree breeding, Relatedness, Genome, Plant, Genome-Wide Association Study, 010606 plant biology & botany
Abstract

Genome-wide association studies (GWAS) in plants typically suffer from limited statistical power. An alternative to the logistical and cost challenge of increasing sample sizes is to gain power by meta-analysis using information from independent studies. We carried out GWAS for growth traits with six single-marker models and regional heritability mapping (RHM) in four Eucalyptus breeding populations independently and by Joint-GWAS, using gene and segment-based models, with data for 3373 individuals genotyped with a communal EUChip60KSNP platform. While single-single nucleotide polymorphism (SNP) GWAS hardly detected significant associations at high-stringency in each population, gene-based Joint-GWAS revealed nine genes significantly associated with tree height. Associations detected using single-SNP GWAS, RHM and Joint-GWAS set-based models explained on average 3-20% of the phenotypic variance. Whole-genome regression, conversely, captured 64-89% of the pedigree-based heritability in all populations. Several associations independently detected for the same SNPs in different populations provided unprecedented GWAS validation results in forest trees. Rare and common associations were discovered in eight genes involved in cell wall biosynthesis and lignification. With the increasing adoption of genomic prediction of complex phenotypes using shared SNPs and much larger tree breeding populations, Joint-GWAS approaches should provide increasing power to pinpoint discrete associations potentially useful toward tree breeding and molecular applications.

Published
2018

3. Relationship between Physical Activity, Oxidative Stress, and Total Plasma Antioxidant Capacity in Spanish Children from the GENOBOX Study

Author

María D. Mesa, Rosaura Leis, Augusto Anguita-Ruiz, Azahara I. Rupérez, Concepción M. Aguilera, Luis A. Moreno, Angel Gil, Francisco Jesus Llorente-Cantarero, Francisco Javier Aguilar-Gómez, Gloria Bueno, Rocío Vázquez-Cobela, Mercedes Gil-Campos, Universidade de Santiago de Compostela. Departamento de Ciencias Forenses, Anatomía Patolóxica, Xinecoloxía e Obstetricia, e Pediatría, [Llorente-Cantarero,FJ] Department of Specific Didactics, Faculty of Education, Maimónides Institute of Biomedicine Research of Córdoba (IMIBIC), University of Córdoba, Córdoba, Spain. [Llorente-Cantarero,FJ, Leis,R, Bueno,G, Anguita-Ruiz,A, Vázquez-Cobela,R, Moreno,LA, Gil,A, Aguilera,CM, Gil-Campos,M] CIBEROBN, (Physiopathology of Obesity and Nutrition) Institute of Health Carlos III (ISCIII), Madrid, Spain. [Aguilar-Gomez FJ, Gil-Campos,M] Metabolism and Investigation Unit, Reina Sofía University Hospital, Maimónides Institute of Biomedicine Research of Córdoba (IMIBIC), University of Córdoba, Córdoba, Spain. [Leis,R, Vázquez-Cobela,R] Unit of Investigation in Nutrition, Growth and Human Development of Galicia, Pediatric Department, University of Santiago de Compostela, Clinic University Hospital of Santiago, Instituto de Investigación Sanitaria de Santiago (IDIS), Santiago de Compostela, Spain. [Bueno,G] Pediatric Endocrinology Unit, Clinic University Hospital Lozano Blesa, Facultad de Medicina, Universidad de Zaragoza, Zaragoza, Spain. [Bueno,G, Rupérez,AI, Moreno,LA] GENUD Research Group, Instituto Agroalimentario de Aragón (IA2), Instituto de Investigación Sanitaria (IIS) Aragón, University of Zaragoza, Zaragoza, Spain. [Anguita-Ruiz,A, Mesa,MA, Aguilera,CM] Department of Biochemistry and Molecular Biology II, Institute of Nutrition and Food Technology 'José Mataix', Center of Biomedical Research, University of Granada, Armilla, Granada, Spain. [Anguita-Ruiz,A, Aguilera,CM] Instituto de Investigación Biosanitaria ibs Granada, 18014 Granada, Spain., This research was funded by the Plan Nacional de Investigación Científica, Desarrollo e Innovación Tecnológica (I + D + I), Instituto de Salud Carlos III-Health Research Funding (FONDOS FEDER) (PI11/02042, PI11/02059, PI11/01425, and PI16/00871, PI16/01301, PI16/01205) and RETIC (Redes temáticas de investigación cooperativa) (Red SAMID RD12/0026/0015). The authors also acknowledge Instituto de Salud Carlos III for personal funding of A.A.R: Contratos i-PFIS: doctorados IIS-empresa en ciencias y tecnologías de la salud de la convocatoria 2017 de la Acción Estratégica en Salud 2013–2016 (IFI17/00048). Á.G. was funded by the Research Plan of the Vice-Rectorate of Research and Transfer of the University of Granada, Spain This paper will be included in F.J.A. doctorate, under the 'Biomedicine Program' at the University of Córdoba, Spain.

Subjects
Antioxidant, Isoprostane, 8-hydroxy-2′-deoxyguanosine, Physiology, medicine.medical_treatment, Clinical Biochemistry, Physical fitness, physical activity, medicine.disease_cause, Biochemistry, Acelerometría, chemistry.chemical_compound, 0302 clinical medicine, Accelerometry, oxidative stress, 030212 general & internal medicine, Isoprostane F2α, Plasma total antioxidant capacity, Phenomena and Processes::Metabolic Phenomena::Metabolism::Oxidative Stress [Medical Subject Headings], Health Care::Health Care Economics and Organizations::Organizations::International Agencies::United Nations::World Health Organization [Medical Subject Headings], Total plasma, plasma total antioxidant capacity, Estrés oxidativo, Ejercicio físico, isoprostane F2, Antioxidant capacity, Analytical, Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Chemistry Techniques, Analytical::Titrimetry::Colorimetry [Medical Subject Headings], Analytical, Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Immunologic Techniques::Immunoassay::Immunoenzyme Techniques::Enzyme-Linked Immunosorbent Assay [Medical Subject Headings], 8-Hidroxi-2'-Desoxicoguanosina, medicine.medical_specialty, Physical activity, Article, 03 medical and health sciences, Internal medicine, isoprostane F2α, Chemicals and Drugs::Chemical Actions and Uses::Pharmacologic Actions::Physiological Effects of Drugs::Protective Agents::Antioxidants [Medical Subject Headings], medicine, accelerometry, Pysical activity, Molecular Biology, Redox homeostasis, business.industry, lcsh:RM1-950, 030229 sport sciences, Cell Biology, 8-hydroxy-20-deoxyguanosine, Phenomena and Processes::Musculoskeletal and Neural Physiological Phenomena::Musculoskeletal Physiological Phenomena::Physical Fitness [Medical Subject Headings], lcsh:Therapeutics. Pharmacology, chemistry, Oxidative stress, business
Abstract

The World Health Organization has recommended performing at least 60 min a day of moderate-to-vigorous physical activity (MVPA) and reducing sedentarism in children and adolescents to offer significant health benefits and mitigate health risks. Physical fitness and sports practice seem to improve oxidative stress (OS) status during childhood. However, to our knowledge, there are no data regarding the influence of objectively-measured physical activity (PA) and sedentarism on OS status in children and adolescents. The present study aimed to evaluate the influence of moderate and vigorous PA and sedentarism on OS and plasma total antioxidant capacity (TAC) in a selected Spanish population of 216 children and adolescents from the GENOBOX study. PA (light, moderate, and vigorous) and sedentarism (i.e., sedentary time (ST)) were measured by accelerometry. A Physical Activity-Sedentarism Score (PASS) was developed integrating moderate and vigorous PA and ST levels. Urinary 8-hydroxy-20-deoxyguanosine (8-OHdG) and isoprostane F2 (F2-IsoPs), as markers of OS, were determined by ELISA; and TAC was estimated by colorimetry using an antioxidant kit. A higher PASS was associated with lower plasma TAC and urinary 8-OHdG and F2-IsoPs, showing a better redox profile. Reduced OS markers (8-OHdG and F2-IsoPs) in children with higher PASS may diminish the need of maintaining high concentrations of antioxidants in plasma during rest to achieve redox homeostasis., Plan Nacional de Investigación Científica, Desarrollo e Innovación Tecnológica (I + D + I), Instituto de Salud Carlos III-Health Research Funding (FONDOS FEDER) PI11/02042 PI11/02059 PI11/01425 PI16/00871 PI16/01301 PI16/01205, RETIC (Redes temáticas de investigación cooperativa) Red SAMID RD12/0026/0015, Instituto de Salud Carlos III European Commission IFI17/00048, Research Plan of the Vice-Rectorate of Research and Transfer of the University of Granada, Spain

Published
2021

4. Risk factors for bronchiolitis hospitalization in infants: A French nationwide retrospective cohort study over four consecutive seasons (2009-2013)

Author

Jean-Christophe Rozé, Jean-Michel Hascoet, Jean-François Magny, Pierre-Henri Jarreau, Brigitte Fauroux, Elie Saliba, Michaël Schwarzinger, Sommeil-Vigilance-Fatigue et Santé Publique (VIFASOM (URP_7330)), Institut de Recherche Biomédicale des Armées (IRBA)-Université Paris Cité (UPCité), Unité Pédiatrique de Ventilation Non Invasive et de Sommeil [CHU Necker Enfants-Malades], CHU Necker - Enfants Malades [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Maternité Régionale Adolphe Pinard [Nancy], Développement, Adaptation et Handicap. Régulations cardio-respiratoires et de la motricité (DevAH), Université de Lorraine (UL), Université Paris Cité (UPCité), Hôpital Cochin [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Centre hospitalier universitaire de Nantes (CHU Nantes), Physiopathologie des Adaptations Nutritionnelles (PhAN), Université de Nantes - UFR de Médecine et des Techniques Médicales (UFR MEDECINE), Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centre Hospitalier Régional Universitaire de Tours (CHRU Tours), Infection, Anti-microbiens, Modélisation, Evolution (IAME (UMR_S_1137 / U1137)), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris Cité (UPCité)-Université Sorbonne Paris Nord, Translational Health Economics Network [Paris] (THEN), Sorbonne Université (SU), The present study was supported by AbbVie France. Translational Health Economics (THEN) was responsible for data collection, preparation, and validation with external sources of information. THEN received payment from AbbVie for these activities. Writing charges were funded by AbbVie France, and AbbVie approved the decision to submit the paper for publication, but the corresponding author was ultimately responsible for submitting the manuscript for publication., HASCOET, JEAN-MICHEL, Service d'assistance respiratoire et sommeil de l'enfant [CHU Necker], Sommeil-Vigilance-Fatigue et Santé Publique (VIFASOM - EA 7330), Institut de Recherche Biomédicale des Armées (IRBA)-Université de Paris (UP), Regional Maternity [Nancy], Centre Hospitalier Régional Universitaire de Nancy (CHRU Nancy)-Université de Lorraine (UL), Université de Paris (UP), Department of Neonatal Medicine of Port-Royal [Paris], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-CHU Cochin [AP-HP], Neonatal Intensive Care Unit of Port-Royal [Paris], Department of Neonatology [Paris], Department of Neonatology [Nantes], Department of Neonatology [Tours], Hôpital Gatien de Clocheville [Tours], Centre Hospitalier Régional Universitaire de Tours (CHRU Tours)-Centre Hospitalier Régional Universitaire de Tours (CHRU Tours), Université Sorbonne Paris Cité (USPC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Paris (UP)-Université Sorbonne Paris Nord, Université Paris Diderot - Paris 7 (UPD7), Université Sorbonne Paris Cité (USPC), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Paris (UP)-Université Sorbonne Paris Nord, and Centre Hospitalier Régional Universitaire de Tours (CHRU TOURS)

Subjects
Male, Pediatrics, Pulmonology, Epidemiology, Physiology, Cell Transplantation, Comorbidity, [SDV.MHEP.PSR]Life Sciences [q-bio]/Human health and pathology/Pulmonology and respiratory tract, Families, 0302 clinical medicine, [SDV.MHEP.MI]Life Sciences [q-bio]/Human health and pathology/Infectious diseases, Medicine and Health Sciences, Morphogenesis, Blood and Lymphatic System Procedures, Birth Weight, 030212 general & internal medicine, Children, education.field_of_study, Multidisciplinary, Congenital Heart Defects, Hospitals, 3. Good health, Hospitalization, Physiological Parameters, [SDV.MHEP.MI] Life Sciences [q-bio]/Human health and pathology/Infectious diseases, Bronchiolitis, Medicine, Female, France, Seasons, Infants, Research Article, medicine.medical_specialty, Down syndrome, Science, Population, Cardiology, Surgical and Invasive Medical Procedures, 03 medical and health sciences, [SDV.MHEP.PED] Life Sciences [q-bio]/Human health and pathology/Pediatrics, 030225 pediatrics, Internal medicine, Congenital Disorders, medicine, Humans, Birth Defects, education, Transplantation, [SDV.MHEP.PED]Life Sciences [q-bio]/Human health and pathology/Pediatrics, Omphalocele, business.industry, Body Weight, Infant, Biology and Life Sciences, Retrospective cohort study, medicine.disease, Health Care, Bronchopulmonary dysplasia, Age Groups, Health Care Facilities, [SDV.SPEE] Life Sciences [q-bio]/Santé publique et épidémiologie, Medical Risk Factors, People and Places, Respiratory Infections, [SDV.MHEP.PSR] Life Sciences [q-bio]/Human health and pathology/Pulmonology and respiratory tract, Population Groupings, [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie, business, Developmental Biology, Stem Cell Transplantation
Abstract

International audience; Objectives: Large studies are needed to update risk factors of bronchiolitis hospitalization. We performed a nationwide analysis of hospitalization rates for bronchiolitis over four consecutive bronchiolitis seasons to identify underlying medical disorders at risk of bronchiolitis hospitalization and assess their frequency.Methods: Data were retrieved from the French National Hospital Discharge database. Of all infants discharged alive from maternity wards from January 2008 to December 2013 in France (N = 3,884,791), we identified four consecutive cohorts at risk of bronchiolitis during the seasons of 2009–2010 to 2012–2013. The main outcome was bronchiolitis hospitalization during a season. Individual risk factors were collected.Results: Among infants, 6.0% were preterm and 2.0% had ≥1 chronic condition including 0.2% bronchopulmonary dysplasia (BPD) and 0.2% hemodynamically significant congenital heart disease (HS-CHD). Bronchiolitis hospitalization rates varied between seasons (min: 1.26% in 2010–2011; max: 1.48% in 2012–2013; p

Published
2020

5. Long cold exposure induces transcriptional and biochemical remodelling of xylem secondary cell wall in Eucalyptus

Author

Victor Carocha, Raphael Ployet, Jacqueline Grima-Pettenati, Marçal Soler, Nathalie Ladouce, Ana Alves, Luc Harvengt, José-Carlos Rodrigues, Christiane Marque, Chantal Teulières, Fabien Mounet, Laboratoire de Recherche en Sciences Végétales (LRSV), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), RAIZ – Forestry & Paper Research Institut, Régulation et Dynamique de la Formation du Bois, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Centro de Estudos Florestais, Technical University of Lisbon-Instituto Superior de Agronomia, Laboratoire de Biotechnologie, Institut Technologique Forêt Cellulose Bois-construction Ameublement (FCBA), Biologie du fruit et pathologie (BFP), Université Bordeaux Segalen - Bordeaux 2-Institut National de la Recherche Agronomique (INRA)-Université Sciences et Technologies - Bordeaux 1, Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, and FCBA

Subjects
0106 biological sciences, 0301 basic medicine, Physiology, Plant Science, Biology, 01 natural sciences, Cell wall, Transcriptome, 03 medical and health sciences, chemistry.chemical_compound, Cell Wall, Gene Expression Regulation, Plant, Xylem, Botany, Lignin, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, ComputingMilieux_MISCELLANEOUS, Hybrid, Regulation of gene expression, Eucalyptus, Abiotic stress, Gene Expression Profiling, food and beverages, [SDV.BBM.BM]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Molecular biology, [SDV.BBM.MN]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Molecular Networks [q-bio.MN], 15. Life on land, Cold Temperature, 030104 developmental biology, chemistry, Secondary cell wall, 010606 plant biology & botany
Abstract

Although eucalypts are the most planted hardwood trees worldwide, the majority of them are frost sensitive. The recent creation of frost-tolerant hybrids such as Eucalyptus gundal plants (E. gunnii × E. dalrympleana hybrids), now enables the development of industrial plantations in northern countries. Our objective was to evaluate the impact of cold on the wood structure and composition of these hybrids, and on the biosynthetic and regulatory processes controlling their secondary cell-wall (SCW) formation. We used an integrated approach combining histology, biochemical characterization and transcriptomic profiling as well as gene co-expression analyses to investigate xylem tissues from Eucalyptus hybrids exposed to cold conditions. Chilling temperatures triggered the deposition of thicker and more lignified xylem cell walls as well as regulation at the transcriptional level of SCW genes. Most genes involved in lignin biosynthesis, except those specifically dedicated to syringyl unit biosynthesis, were up-regulated. The construction of a co-expression network enabled the identification of both known and potential new SCW transcription factors, induced by cold stress. These regulators at the crossroads between cold signalling and SCW formation are promising candidates for functional studies since they may contribute to the tolerance of E. gunnii × E. dalrympleana hybrids to cold.

Published
2018

6. Reactive oxygen species, heat stress and oxidative-induced mitochondrial damage. A review

Author

Taha Najar, Manef Abdrabbah, Abdeljelil Ghram, Moncef Ben Mrad, Imen Belhadj Slimen, Hajer Dabbebi, Preparatory Institute for Scientific and Technical Studies [La Marsa] (IPEST), Université de Carthage - University of Carthage, Institut National Agronomique de Tunis (INAT), Ministère de l'Enseignement Supérieur et de Recherche Scientifique [Tunisie], Institut Pasteur de Tunis, Réseau International des Instituts Pasteur (RIIP), and The authors thank Gillian Murphy, Emeritus Professor in the Department of Oncology at the University of Cambridge, for her assistance and help with English editing of this paper.

Subjects
Cancer Research, Antioxidant, MESH: Oxidative Stress, Physiology, Cellular respiration, medicine.medical_treatment, Apoptosis, Oxidative phosphorylation, Mitochondrion, Biology, medicine.disease_cause, reactive oxygen species (ROS), DNA, Mitochondrial, MESH: Lipid Peroxidation, heat stress, Electron Transport, Physiology (medical), medicine, Humans, MESH: Electron Transport, chemistry.chemical_classification, MESH: DNA Damage, Reactive oxygen species, MESH: Humans, MESH: Apoptosis, MESH: DNA, Mitochondrial, Metabolism, MESH: Heat-Shock Response, mitochondria, Oxidative Stress, chemistry, Biochemistry, MESH: Reactive Oxygen Species/metabolism, Lipid Peroxidation, Reactive Oxygen Species, Oxidative stress, [SDV.MHEP]Life Sciences [q-bio]/Human health and pathology, Heat-Shock Response, DNA Damage
Abstract

International audience; In recent years there has been enormous interest in researching oxidative stress. Reactive oxygen species (ROS) are derived from the metabolism of oxygen as by-products of cell respiration, and are continuously produced in all aerobic organisms. Oxidative stress occurs as a consequence of an imbalance between ROS production and the available antioxidant defence against them. Nowadays, a variety of diseases and degenerative processes such as cancer, Alzheimer’s and autoimmune diseases are mediated by oxidative stress. Heat stress was suggested to be an environmental factor responsible for stimulating ROS production because of similarities in responses observed following heat stress compared with that occurring following exposure to oxidative stress. This manuscript describes the main mitochondrial sources of ROS and the antioxidant defences involved to prevent oxidative damage in all the mitochondrial compartments. It also deals with discussions concerning the cytotoxic effect of heat stress, mitochondrial heat-induced alterations, as well as heat shock protein (HSP) expression as a defence mechanism.

Published
2014