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Monitoring of freezing dynamics in trees: a simple phase shift causes complexity

hal.structure.identifierEcophysiologie et Génomique Fonctionnelle de la Vigne [UMR EGFV]
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
hal.structure.identifierDepartment of Botany and Department of Ecology
dc.contributor.authorCHARRIER, Guillaume
hal.structure.identifierDepartment of Botany and Department of Ecology
hal.structure.identifierHawkesbury Institute for the Environment [Richmond] [HIE]
dc.contributor.authorNOLF, Markus
hal.structure.identifierDepartment of Botany and Department of Ecology
dc.contributor.authorLEITINGER, Georg
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
dc.contributor.authorCHARRA-VASKOU, Katline
hal.structure.identifierDepartment of Botany and Department of Ecology
dc.contributor.authorLOSSO, Adriano
hal.structure.identifierDepartment of Botany and Department of Ecology
hal.structure.identifierInstitute for Alpine Environment
dc.contributor.authorTAPPEINER, Ulrike
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
dc.contributor.authorAMEGLIO, Thierry
hal.structure.identifierDepartment of Botany and Department of Ecology
dc.contributor.authorMAYR, Stefan
dc.date.issued2017
dc.identifier.issn0032-0889
dc.description.abstractEnDuring winter, trees have to cope with harsh conditions, including extreme freeze-thaw stress. This study focused on ice nucleation and propagation, related water shifts and xylem cavitation, as well as cell damage and was based on in situ monitoring of xylem (thermocouples) and surface temperatures (infrared imaging), ultrasonic emissions, and dendrometer analysis. Field experiments during late winter on Picea abies growing at the alpine timberline revealed three distinct freezing patterns: (1) from the top of the tree toward the base, (2) from thin branches toward the main stem's top and base, and (3) from the base toward the top. Infrared imaging showed freezing within branches from their base toward distal parts. Such complex freezing causes dynamic and heterogenous patterns in water potential and probably in cavitation. This study highlights the interaction between environmental conditions upon freezing and thawing and demonstrates the enormous complexity of freezing processes in trees. Diameter shrinkage, which indicated water fluxes within the stem, and acoustic emission analysis, which indicated cavitation events near the ice front upon freezing, were both related to minimum temperature and, upon thawing, related to vapor pressure deficit and soil temperature. These complex patterns, emphasizing the common mechanisms between frost and drought stress, shed new light on winter tree physiology.
dc.language.isoen
dc.publisherOxford University Press ; American Society of Plant Biologists
dc.rights.urihttp://creativecommons.org/licenses/by-sa/
dc.subjectstress thermique
dc.subjectcavitation
dc.subjectpériode hivernale
dc.subjectarbre forestier
dc.subjectcamera infrarouge
dc.subjectdendromètre
dc.subject.enheat stress
dc.subject.enforest tree
dc.title.enMonitoring of freezing dynamics in trees: a simple phase shift causes complexity
dc.typeArticle de revue
dc.identifier.doi10.1104/pp.16.01815
dc.subject.halSciences du Vivant [q-bio]
dc.description.sponsorshipEuropeAgreenSkills+
bordeaux.journalPlant Physiology
bordeaux.page2196-2207
bordeaux.volume173
bordeaux.issue4
bordeaux.peerReviewedoui
hal.identifierhal-01605135
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01605135v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Plant%20Physiology&rft.date=2017&rft.volume=173&rft.issue=4&rft.spage=2196-2207&rft.epage=2196-2207&rft.eissn=0032-0889&rft.issn=0032-0889&rft.au=CHARRIER,%20Guillaume&NOLF,%20Markus&LEITINGER,%20Georg&CHARRA-VASKOU,%20Katline&LOSSO,%20Adriano&rft.genre=article


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