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Annual shoot-growth in Nothofagus antarctica (G. Forster) Oersted (Nothogagaceae) from northern Patagonia

Stecconi Marina, Puntieri Javier, Barthélémy Daniel. 2000. Annual shoot-growth in Nothofagus antarctica (G. Forster) Oersted (Nothogagaceae) from northern Patagonia. Trees, 14 : pp. 289-296.

Journal article ; Article de revue à facteur d'impact
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Autre titre : Croissance de la pousse annuelle chez Nothofagus antarctica (G. Forster) Oersted (Nothofagaceae) en Patagonie septentrionale

Abstract : The growth dynamics of annual shoots of #Nothofagus antarctica# shrubs from northern Patagonia was studied. The pattern of extension of the shoots derived from the three most distal buds of 100 parent shoots was registered. Weekly measurements and observations of extending shoots were carried out during the 1996-1997 growth season. The date of shoot extension initiation was less variable than the date of shoot extension cessation. Extension curves had an asymmetrically sigmoid outline. Most extension took place uninterruptedly between mid-September 1996 and the end of January 1997. Extension rate reached its highest value in the second half of the extension period. Leaf unfolding rate had a peak early in the extension period and fluctuated irregularly later on. The apical meristem of all shoots died by the end of shoot extension. In general terms, shoot length, diameter, leaf number and extension duration decreased from the first to the third position from the parent shoot's apex, although exceptions to this pattern were found. Shoot extension rate was affected by maximum and minimum daily temperatures but not by the amount of precipitation during the extension period. The size of a bud was not related to the size of the shoot derived from it. The size of shoots in the third position from the apex was related to parent shoot size; this was not the case for more distal shoots. (Résumé d'auteur)

Mots-clés Agrovoc : Nothofagus, Croissance, Poussée, Développement saisonnier, Facteur du milieu, Tige, Feuille

Mots-clés géographiques Agrovoc : Argentine

Mots-clés complémentaires : Architecture végétale

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

Auteurs et affiliations

  • Stecconi Marina, Universidad Nacional del Comahue (ARG)
  • Puntieri Javier, Universidad Nacional del Comahue (ARG)
  • Barthélémy Daniel, CIRAD-AMIS-AMAP (FRA) ORCID: 0000-0003-3187-2517

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/475951/)

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