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Stable water isotopes reveal the onset of bud dormancy in temperate trees, whereas water content is a better proxy for dormancy release

hal.structure.identifierSwiss Federal Institute for Forest, Snow and Landscape Research WSL
dc.contributor.authorWALDE, Manuel
hal.structure.identifierBiologie du fruit et pathologie [BFP]
dc.contributor.authorWENDEN, Bénédicte
hal.structure.identifierCentre d’Ecologie Fonctionnelle et Evolutive [CEFE]
dc.contributor.authorCHUINE, Isabelle
hal.structure.identifierSwiss Federal Institute for Forest, Snow and Landscape Research WSL
hal.structure.identifierInstitute for Terrestrial Ecosystems, Ecosystem Management, ETH Zürich
dc.contributor.authorGESSLER, Arthur
hal.structure.identifierSwiss Federal Institute for Forest, Snow and Landscape Research WSL
dc.contributor.authorSAURER, Matthias
hal.structure.identifierSwiss Federal Institute for Forest, Snow and Landscape Research WSL
dc.contributor.authorVITASSE, Yann
dc.date.issued2024-02-28
dc.identifier.issn0829-318X
dc.description.abstractEnAbstract Earlier spring growth onset in temperate forests is a visible effect of global warming that alters global water and carbon cycling. Consequently, it becomes crucial to accurately predict the future spring phenological shifts in vegetation under different climate warming scenarios. However, current phenological models suffer from a lack of physiological insights of tree dormancy and are rarely experimentally validated. Here, we sampled twig cuttings of five deciduous tree species at two climatically different locations (270 and 750 m a.s.l., ~ 2.3 °C difference) throughout the winter of 2019–20. Twig budburst success, thermal time to budburst, bud water content and short-term 2H-labelled water uptake into buds were quantified to link bud dormancy status with vascular water transport efficacy, with the objective of establishing connections between the dormancy status of buds and their effectiveness in vascular water transport. We found large differences in the dormancy status between species throughout the entire investigation period, likely reflecting species-specific environmental requirements to initiate and release dormancy, whereas only small differences in the dormancy status were found between the two studied sites. We found strong 2H-labelled water uptake into buds during leaf senescence, followed by a sharp decrease, which we ascribed to the initiation of endodormancy. However, surprisingly, we did not find a progressive increase in 2H-labelled water uptake into buds as winter advanced. Nonetheless, all examined tree species exhibited a consistent relationship between bud water content and dormancy status. Our results suggest that short-term 2H-labelled water uptake may not be a robust indicator of dormancy release, yet it holds promise as a method for tracking the induction of dormancy in deciduous trees. By contrast, bud water content emerges as a cost-effective and more reliable indicator of dormancy release.
dc.language.isoen
dc.publisherOxford University Press (OUP)
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.subject.enchilling
dc.subject.enclimate chamber experiments
dc.subject.enforcing
dc.subject.enstable isotope labelling
dc.subject.entree phenology
dc.title.enStable water isotopes reveal the onset of bud dormancy in temperate trees, whereas water content is a better proxy for dormancy release
dc.typeArticle de revue
dc.identifier.doi10.1093/treephys/tpae028
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale/Amélioration des plantes
bordeaux.journalTree Physiology
bordeaux.volume44
bordeaux.issue4
bordeaux.peerReviewedoui
hal.identifierhal-04610728
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04610728v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Tree%20Physiology&rft.date=2024-02-28&rft.volume=44&rft.issue=4&rft.eissn=0829-318X&rft.issn=0829-318X&rft.au=WALDE,%20Manuel&WENDEN,%20B%C3%A9n%C3%A9dicte&CHUINE,%20Isabelle&GESSLER,%20Arthur&SAURER,%20Matthias&rft.genre=article


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