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AOBPreview originally published online on August 21, 2003
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Annals of Botany 92: 589-599, 2003
© 2003 Annals of Botany Company

Axis Differentiation in Two South American Nothofagus Species (Nothofagaceae)

J. G. PUNTIERI*,1,2, M. S. SOUZA1,2, C. BRION1, C. MAZZINI1,2 and D. BARTHÉLÉMY3

1 Department of Botany, Universidad Nacional del Comahue, Quintral 1250, 8400 Bariloche, Argentina 2 Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina 3 Unité Mixte de Recherche CIRAD–CNRS (UMR 5120)–INRA (UMR 931)–IRD (R 158)–Université Montpellier II, ‘Botanique et Bioinformatique de l’Architecture des Plantes’ (AMAP), CIRAD, TA40/PS2, 34398 Montpellier Cédex 5, France

* For correspondence. E-mail jpuntier{at}crub.uncoma.edu.ar

Received: 14 March 2003    Revised: 20 May 2003; Accepted: 27 June 2003    Published electronically: 21 August 2003

An analysis was carried out on the length, diameter and number of leaves, and the ratios between these variables for current-year growth units (sibling growth units) derived from different nodes of previous-year growth units (parent growth units) of young Nothofagus dombeyi and Nothofagus pumilio trees. Changes in sibling growth unit length, diameter, and number of leaves with position on the parent growth unit were assessed. In both species, sibling-growth unit morphology varied according to both the axis type of the parent growth unit and the position of the sibling growth unit on its parent growth unit. For the largest parent growth units, the length, diameter and number of leaves of their sibling growth units decreased from distal to proximal positions on the parent growth unit. Distal sibling growth units had a more slender stem and longer internodes than proximal sibling growth units. Sibling growth units in equivalent positions tended to have a more slender stem for N. dombeyi than for N. pumilio. Long main-branch growth units of N. pumilio had longer internodes than those of N. dombeyi; the converse was true for shorter growth units. The growth unit diameter/leaf number ratio was consistently higher for N. pumilio than for N. dombeyi. Nothofagus pumilio axes would go through a faster transition from an ‘exploring’ morphology to an ‘exploiting’ morphology than N. dombeyi axes. Within- and between-species variations in growth unit morphology should be considered when assessing the adaptive value of the branching pattern of plants.

Key words: Architecture, axis differentiation, branching pattern, growth unit, morphogenetic gradients, Nothofagus dombeyi, Nothofagus pumilio, tree.


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