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Assessing frost damages using dynamic models in walnut trees: exposure rather than vulnerability controls frost risks

dc.rights.licenseopenen_US
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
hal.structure.identifierEcophysiologie et Génomique Fonctionnelle de la Vigne [UMR EGFV]
dc.contributor.authorCHARRIER, Guillaume
dc.contributor.authorCHUINE, Isabelle
dc.contributor.authorBONHOMME, Marc
dc.contributor.authorAMEGLIO, Thierry
dc.date.accessioned2020-04-10T09:48:44Z
dc.date.available2020-04-10T09:48:44Z
dc.date.issued2018
dc.identifier.issn0140-7791en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/4224
dc.description.abstractEnFrost damages develop when exposure overtakes frost vulnerability. Frost risk assessment therefore needs dynamic simulation of frost hardiness using temperature and photoperiod in interaction with developmental stage. Two models, including or not the effect of photoperiod were calibrated using five years of frost hardiness monitoring (2007–2012), in two locations (low and high elevation) for three walnut genotypes with contrasted phenology and maximum hardiness (Juglans regia cv Franquette, Juglans regia x nigra ‘Early’ and ‘Late’). The Photothermal model predicted more accurate values for all genotypes (Efficiency = 0.879, RMSEP = 2.55 °C) than the Thermal model (Efficiency = 0.801, RMSEP = 3.24 °C). Predicted frost damages were strongly correlated to minimum temperature of the freezing events (ρ = −0.983) rather than actual frost hardiness (ρ = −0.515), or ratio of phenological stage completion (ρ = 0.336). Higher frost risks are consequently predicted during winter, at high elevation, whereas spring is only risky at low elevation in early genotypes exhibiting faster dehardening rate. However, early frost damages, although of lower value, may negatively affect fruit production the subsequent year (R2 = 0.381, P = 0.057). These results highlight the interacting pattern between frost exposure and vulnerability at different scales and the necessity of intra-organ studies to understand the time course of frost vulnerability in flower buds along the winter.
dc.language.isoENen_US
dc.subjectModèle de simulation
dc.subjectRésistance au gel
dc.subjectPhotopériode
dc.subjectJuglans Nigra
dc.subjectJuglans Regia
dc.subject.enAbiotic Stress
dc.subject.enDormancy
dc.subject.enDormancy
dc.subject.enFrost Hardiness
dc.subject.enPhenology
dc.subject.enPhotoperiod
dc.subject.enTemperature
dc.title.enAssessing frost damages using dynamic models in walnut trees: exposure rather than vulnerability controls frost risks
dc.title.alternativePlant cell environ.en_US
dc.typeArticle de revueen_US
dc.identifier.doi10.1111/pce.12935
dc.subject.halSciences du Vivant [q-bio]/Biologie végétaleen_US
dc.identifier.pubmed28185293en_US
bordeaux.journalPlant, Cell and Environmenten_US
bordeaux.page1008-1021en_US
bordeaux.volume41en_US
bordeaux.hal.laboratoriesEcophysiologie et Génomique Fonctionnelle de la Vigne (EGFV) - UMR 1287en_US
bordeaux.issue5en_US
bordeaux.institutionBordeaux Sciences Agroen_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
hal.identifierhal-03170694
hal.version1
hal.date.transferred2021-03-16T12:46:00Z
hal.exporttrue
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