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The onset of xylogenesis in Smith fir is not related to outer bark thickness

Li Xiaoxia, Rossi Sergio et Liang Eryuan. (2019). The onset of xylogenesis in Smith fir is not related to outer bark thickness. American Journal of Botany, 106, (10), p. 1386-1391.

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URL officielle: http://dx.doi.org/doi:10.1002/ajb2.1360

Résumé

Premise The resumption of stem growth varies across the ontogenetic development of trees. Compared with younger trees, older ones have thicker outer bark with a temperature-insulating effect that could potentially prevent the stem from warming in the spring. However, the question of whether xylogenesis in old trees is influenced by the thick bark still remains unresolved.

Methods We investigated the onset of xylogenesis across the ontogenetic development of Smith fir (Abies georgei var. smithii) trees in the Sygera Mountains, southeastern Tibetan Plateau. The outer bark of older trees was also removed. Xylogenesis was monitored in microcores we collected every 3 days during May and June in 2017.

Results Xylogenesis began in late May in young (<50 yr) and mature (50–100 yr) trees, 1 week earlier than in adult (>100–150 yr) and old (>150–200 yr) trees. Older (>200 yr) trees had the latest onset of xylogenesis, 2 weeks after young trees. The resumption of xylogenesis was similar between the control and bark-removed trees.

Conclusions Growth resumption was delayed in older and bigger trees. Outer bark did not affect the onset of xylogenesis, which indicated that the delayed resumption of growth during the lifespan of trees could be more related to endogenous factors than to an insulating effect of the thick bark of older individuals.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0002-9122
Volume:106
Numéro:10
Pages:p. 1386-1391
Version évaluée par les pairs:Oui
Date:2019
Identifiant unique:10.1002/ajb2.1360
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
Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Mots-clés:cambium, cell differentiation. dendroecology, manipulative experiment, ontogeny, secondary phloem, subalpine forest, tree ring, wood formation, xylem growth
Déposé le:02 juin 2023 14:22
Dernière modification:02 juin 2023 14:22
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