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The physiological mechanisms behind the earlywood-to-latewood transition : a process-based modeling approach

Carteni Fabrizio, Deslauriers Annie, Rossi Sergio, Morin Hubert, De Micco Veronica, Mazzoleni Stefano et Giannino Francesco. (2018). The physiological mechanisms behind the earlywood-to-latewood transition : a process-based modeling approach. Frontiers in Plant Science, 9, e1053.

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URL officielle: http://dx.doi.org/doi:10.3389/fpls.2018.01053

Résumé

In extratropical ecosystems, the growth of trees is cyclic, producing tree rings composed of large-lumen and thin-walled cells (earlywood) alternating with narrow-lumen and thick-walled cells (latewood). So far, the physiology behind wood formation processes and the associated kinetics has rarely been considered to explain this pattern. We developed a process-based mechanistic model that simulates the development of conifer tracheids, explicitly considering the processes of cell enlargement and the deposition and lignification of cell walls. The model assumes that (1) wall deposition gradually slows down cell enlargement and (2) the deposition of cellulose and lignin is regulated by the availability of soluble sugars. The model reliably reproduces the anatomical traits and kinetics of the tracheids of four conifer species. At the beginning of the growing season, low sugar availability in the cambium results in slow wall deposition that allows for a longer enlargement time; thus, large cells with thin walls (i.e., earlywood) are produced. In late summer and early autumn, high sugar availability produces narrower cells having thick cell walls (i.e., latewood). This modeling framework provides a mechanistic link between plant ecophysiology and wood phenology and significantly contributes to understanding the role of sugar availability during xylogenesis.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:1664-462X
Volume:9
Pages:e1053
Version évaluée par les pairs:Oui
Date:20 Juillet 2018
Identifiant unique:10.3389/fpls.2018.01053
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:carbon allocation, cell enlargement, cell-wall thickening, sugar availability, tree ring, wood anatomy, xylogenesis
Déposé le:24 mai 2023 15:06
Dernière modification:24 mai 2023 15:06
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