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Pith: A new criterion for monitoring the architecture in Mediterranean pines

Buissart F., Caraglio Y., Borianne P., Guéroult M., Le Bec J., Pailler F., Vennetier M., Zilliox C., Sabatier S.A.. 2015. Trees, 29 (6) : p. 1827-1836.

Plant architecture can be used to study plant development retrospectively thanks to time-dependent morphological markers, particularly those corresponding to the winter break in temperate regions. The Aleppo Pine and the Turkish Pine are polycyclic species, thus they usually develop several consecutive growth units per year, making it sometimes difficult to date them. In this study, we show that keeping track of the pith diameter profile, to date each shoot, is an efficient method. The pith diameter is larger on the first growth unit than on the last growth unit of the year. Moreover, a pairwise comparison showed that the pith diameter undergoes a decrease along the annual shoot from the first growth unit to the last. As pith diameter decreases upwards the annual shoot, it can be used for dating. Pith diameter progresses from 1 year to another too: there is an increase in the early years of life, corresponding to the tree's establishment phase. Lastly, we found a positive relationship between the basal pith diameter of an annual shoot and its length. The variability around this relationship could reflect environmental conditions, especially climate conditions. (Résumé d'auteur)

Mots-clés : modèle de croissance forestière; cerne; croissance; zone tempérée; cycle de développement; port de la plante; accroissement du diamètre; bois de coeur; moelle; morphologie végétale; anatomie végétale; pinus brutia; pinus halepensis; architecture végétale; architecture des arbres

Thématique : Anatomie et morphologie des plantes; Physiologie végétale : croissance et développement; Technologie des produits forestiers

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