Constellation, le dépôt institutionnel de l'Université du Québec à Chicoutimi

Critical temperatures for xylogenesis in conifers of cold climates

Rossi Sergio, Deslauriers Annie, Gričar Jožica, Seo Jeong-Wook, Rathgeber Cyrille B. K., Anfodillo Tommaso, Morin Hubert, Levanic Tom, Oven Primoz et Jalkanen Risto. (2008). Critical temperatures for xylogenesis in conifers of cold climates. Global Ecology and Biogeography, 17, (6), p. 696-707.

Le texte intégral n'est pas disponible pour ce document.

URL officielle:


Aim: To identify temperatures at which cell division and differentiation are active in order to verify the existence of a common critical temperature determining growth in conifers of cold climates.

Location: Ten European and Canadian sites at different latitudes and altitudes.

Methods: The periods of cambial activity and cell differentiation were assessed on a weekly time-scale on histological sections of cambium and wood tissue collected over 2 to 5 years per site from 1998 to 2005 from the stems of seven conifer species. All data were compared with daily air temperatures recorded from weather stations located close to the sites. Logistic regressions were used to calculate the probability of xylogenesis and of cambium being active at a given temperature.

Results: Xylogenesis lasted from May to October, with a growing period varying from 3 to 5 months depending on location and elevation. Despite the wide geographical range of the monitored sites, temperatures for onset and ending of xylogenesis converged towards narrow ranges with average values around 4-5, 8-9 and 13-14 °C for daily minimum, mean and maximum temperature, respectively. On the contrary, cell division in the cambium stopped in July-August, when temperatures were still high.

Main conclusions: Wood formation in conifers occurred when specific critical temperatures were reached. Although the timing and duration of xylogenesis varied among species, sites and years, the estimated temperatures were stable for all trees studied. These results provide biologically based evidence that temperature is a critical factor limiting production and differentiation of xylem cells in cold climates. Although daily temperatures below 4-5 °C are still favourable for photosynthesis, thermal conditions below these values could inhibit the allocation of assimilated carbon to structural investment, i.e. xylem growth.

Type de document:Article publié dans une revue avec comité d'évaluation
Pages:p. 696-707
Version évaluée par les pairs:Oui
Identifiant unique:10.1111/j.1466-8238.2008.00417.x
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, cambium, growing period, microcoring, pinning, treeline, wood formation, xylem
Déposé le:26 mai 2023 13:12
Dernière modification:26 mai 2023 13:12
Afficher les statistiques de telechargements

Éditer le document (administrateurs uniquement)

Creative Commons LicenseSauf indication contraire, les documents archivés dans Constellation sont rendus disponibles selon les termes de la licence Creative Commons "Paternité, pas d'utilisation commerciale, pas de modification" 2.5 Canada.

Bibliothèque Paul-Émile-Boulet, UQAC
555, boulevard de l'Université
Chicoutimi (Québec)  CANADA G7H 2B1
418 545-5011, poste 5630