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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URL officielle: http://dx.doi.org/doi:10.3389/fpls.2017.02264
Résumé
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 |
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ISSN: | 1664-462X |
Volume: | 8 |
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 |
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Dernière modification: | 06 févr. 2018 02:03 |
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