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Effects of age and size on xylem phenology in two conifers of Northwestern China

Zeng Qiao, Rossi Sergio et Yang Bao. (2018). Effects of age and size on xylem phenology in two conifers of Northwestern China. Frontiers in Plant Science, 8, p. 1-9.

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The climatic signals that directly affect the trees can be registered by xylem during its growth. If the timings and duration of xylem formation change, xylogenesis can occur under different environmental conditions and subsequently be subject to different climatic signals. An experimental design was applied in the field to disentangle the effects of age and size on xylem phenology, and it challenges the hypothesis that the timings and dynamics of xylem growth are size-dependent. Intra-annual dynamics of xylem formation were monitored weekly during the growing seasons 2013 and 2014 in Chinese pine (Pinus tabulaeformis) and Qilian juniper (Juniperus przewalskii) with different sizes and ages in a semi-arid region of northwestern China. Cell differentiation started 3 weeks earlier in 2013 and terminated 1 week later in 2014 in small-young pines than in big-old pines. However, differences in the timings of growth reactivation disappeared when comparing the junipers with different sizes but similar age. Overall, 77 days were required for xylem differentiation to take place, but timings were shorter for older trees, which also exhibited smaller cell production. Results from this study suggest that tree age does play an important role in timings and duration of growth. The effect of age should also be considered to perform reliable responses of trees to climate.

Type de document:Article publié dans une revue avec comité d'évaluation
Pages:p. 1-9
Version évaluée par les pairs:Oui
Date:12 Janvier 2018
Identifiant unique:10.3389/fpls.2017.02264
Sujets: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:cambium activity, cell differentiation, Juniperus przewalskii, Pinus tabulaeformis, radial growth, wood anatomy, xylogenesis, activité cambiale, différenciation cellulaire, croissance radiale, anatomie du bois, xylogénèse
Informations complémentaires:This Document is Protected by copyright and was first published by Frontiers. All rights reserved. it is reproduced with permission.
Déposé le:06 févr. 2018 02:03
Dernière modification:06 févr. 2018 02:03
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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.

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