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Ecotypic differentiation of black spruce populations : temperature triggers bud burst but not bud set

Usmani Anam, Silvestro Roberto, Zhang Shaokang, Huang Jian-Guo, Saracino Antonio et Rossi Sergio. (2020). Ecotypic differentiation of black spruce populations : temperature triggers bud burst but not bud set. Trees, 34, (5), p. 1313-1321.

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URL officielle: http://dx.doi.org/doi:10.1007/s00468-020-01999-4

Résumé

Key message: Black spruce ecotypes exhibit temperature-adapted bud burst, while bud set is independent of temperature. Warmer conditions could advance bud burst, but no direct effect is expected for bud set

Abstract: Phenological adjustment is a key adaptive trait closely associated with the environment. Species spreading over a wide geographical range can evolve ecotypes that are able to grow and reproduce under particular local conditions. We compared the thermal conditions during bud phenology in black spruce [Picea mariana (Mill.) BSP] populations to assess the differences among ecotypes. The phases of bud burst and bud set were monitored weekly during 2015, 2017 and 2018 in saplings growing in a common garden, and originating from a latitudinal range across the whole closed boreal forest of Quebec, Canada. Provenances from the northern sites exhibited both earlier bud burst and bud set, with differences of 8 and 11 days, respectively, between the northern and southern provenances. Bud burst occurred under colder temperatures in provenances from the northern sites. The phase of open bud occurred at 4 °C in the northernmost provenance, compared to 8 °C in the southernmost one. Bud set occurred in summer, when temperatures still exceeded 20 °C, and no difference was observed between provenances. Black spruce populations exhibit a clear clinal differentiation in ecotypes showing temperature-adapted bud burst of the apical meristem. The need to complete formation of the winter bud and hardening before autumn leads bud set to being independent of the air temperature. Warmer conditions can affect the timings of spring phenology by anticipating bud burst in black spruce, although no direct effect may be expected for bud set.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0931-1890
Volume:34
Numéro:5
Pages:p. 1313-1321
Version évaluée par les pairs:Oui
Date:2020
Identifiant unique:10.1007/s00468-020-01999-4
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
Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Mots-clés:boreal forest, bud phenology, climate change, clinal variation, meristem, Picea mariana
Déposé le:01 juin 2023 14:58
Dernière modification:01 juin 2023 14:58
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