An architectural approach to the growth forms of Nothofagus pumilo (Nothofagaceae) along an altitudinal gradient

International audience Variations in the architecture and axis structure of different growth forms of Nothofagus pumilio (Poepp. et Endl.) Krasser (Nothofagaceae) were studied along an altitudinal gradient. We evaluated the primary growth and branching pattern of annual shoots belonging to the main...

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Bibliographic Details
Published in:Botany
Main Authors: Stecconi, Marina, Puntieri, Javier, Barthélémy, Daniel
Other Authors: Universidad Nacional del Comahue Neuquén (UNCOMA), Instituto Nacional de Investigaciones en Biodiversidad y Medioambiente Bariloche (INIBIOMA-CONICET), Consejo Nacional de Investigaciones Científicas y Técnicas Buenos Aires (CONICET)-Universidad Nacional del Comahue Neuquén (UNCOMA), BotAnique et BioinforMatique de l'Architecture des Plantes (UMR AMAP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Recherche pour le Développement (IRD France-Ouest )-Centre National de la Recherche Scientifique (CNRS)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2010
Subjects:
AXE DE DIFFERENCIATION
HETRE ANTARCTIQUE
FORMES DE CROISSANCE
[SDV]Life Sciences [q-bio]
Patagonia
Antarc*
Antarctique*
Online Access:https://hal.inrae.fr/hal-02665073
https://doi.org/10.1139/B10-040
Description
Summary:International audience Variations in the architecture and axis structure of different growth forms of Nothofagus pumilio (Poepp. et Endl.) Krasser (Nothofagaceae) were studied along an altitudinal gradient. We evaluated the primary growth and branching pattern of annual shoots belonging to the main axis categories (trunk, main branches, and secondary (short) branches) of four growth forms developed at different altitudes (1200–1600 m a.s.l.) in northern Patagonia: (i) low shrubs at the high-altitude timberline, (ii) high shrubs at high altitude, (iii) low trees at mid-altitude slopes, and (iv) high trees at low-altitude single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the structural distinction between growth forms of N. pumilio.

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