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The early bud gets the cold : diverging spring phenology drives exposure to late frost in a Picea mariana [(Mill.) BSP ] common garden

Mura Claudio, Buttò Valentina, Silvestro Roberto, Deslauriers Annie, Charrier Guillaume, Raymond Patricia et Rossi Sergio. (2022). The early bud gets the cold : diverging spring phenology drives exposure to late frost in a Picea mariana [(Mill.) BSP ] common garden. Physiologia Plantarum, 174, (6), e13798.

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URL officielle: http://dx.doi.org/doi:10.1111/ppl.13798

Résumé

Under climate change, the increasing occurrence of late frost combined with advancing spring phenology can increase the risk of frost damage in trees. In this study, we tested the link between intra-specific variability in bud phenology and frost exposure and damages. We analysed the effects of the 2021 late frost event in a black spruce (Picea mariana (Mill.) BSP) common garden in Québec, Canada. We hypothesized that the timing of budbreak drives the exposure of vulnerable tissues and explains differences in frost damage. Budbreak was monitored from 2015 to 2021 in 371 trees from five provenances originating between 48° and 53° N and planted in a common garden at 48° N. Frost damages were assessed on the same trees through the proportion of damaged buds per tree and related to the phenological phases by ordinal regressions. After an unusually warm spring, minimum temperatures fell to -1.9°C on May 28 and 29, 2021. At this moment, trees from the northern provenances were more advanced in their phenology and showed more frost damage. Provenances with earlier budbreak had a higher probability of damage occurrence according to ordinal regression. Our study highlights the importance of intra-specific variability of phenological traits on the risk of frost exposure. We provide evidence that the timings of bud phenology affect sensitivity to frost, leading to damages at temperatures of -1.9°C. Under the same conditions, the earlier growth reactivation observed in the northern provenances increases the risks of late frost damage on the developing buds.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0031-9317
Volume:174
Numéro:6
Pages:e13798
Version évaluée par les pairs:Oui
Date:2022
Identifiant unique:10.1111/ppl.13798
Sujets:Sciences naturelles et génie > Sciences appliquées > Climatologie et météorologie
Sciences naturelles et génie > Sciences appliquées > Foresterie et sciences du bois
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:black spruce, budbreak, false spring, frost hardiness, provenance trial
Déposé le:23 mai 2023 14:04
Dernière modification:23 mai 2023 14:04
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