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Axis differentiation in two South American Nothofagus species (Nothofagaceae)

Puntieri Javier G., Souza Maria S., Brion Cécilia, Mazzini Camilo, Barthélémy Daniel. 2003. Axis differentiation in two South American Nothofagus species (Nothofagaceae). Annals of Botany, 92 : pp. 589-599.

Journal article ; Article de revue à facteur d'impact
Full text not available from this repository.

Autre titre : Différenciation des axes chez deux espèces de Nothofagus (Nothofagaceae) d'Amérique du sud

Abstract : 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. (Résumé d'auteur)

Mots-clés Agrovoc : Nothofagus dombeyi, Nothofagus pumilio, Tronc, Branche, Feuille, Ramification, Morphogénèse, Anatomie végétale, Croissance

Mots-clés géographiques Agrovoc : Argentine

Mots-clés complémentaires : Architecture végétale

Classification Agris : F50 - Plant structure
F62 - Plant physiology - Growth and development

Auteurs et affiliations

  • Puntieri Javier G., Universidad Nacional del Comahue (ARG)
  • Souza Maria S., Universidad Nacional del Comahue (ARG)
  • Brion Cécilia, Universidad Nacional del Comahue (ARG)
  • Mazzini Camilo, Universidad Nacional del Comahue (ARG)
  • Barthélémy Daniel, CIRAD-AMIS-AMAP (FRA) ORCID: 0000-0003-3187-2517

Autres liens de la publication

  • Document en bibliothèque
  • Localisation du document : CD_BR11822 [(Bibliothèque de Lavalette)] ; CD_PE871 [(Bibliothèque de Lavalette)]

Source : Cirad - Agritrop (https://agritrop.cirad.fr/515486/)

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