Deciphering the ontogeny of a sympodial tree

Costes Evelyne, Guédon Yann. 2012. Deciphering the ontogeny of a sympodial tree. Trees, 26 (3) : 865-879.

Quartile : Q1, Sujet : FORESTRY

Résumé : This paper addresses the identification and characterization of developmental patterns in the whole structure of a sympodial species, the apple tree. Dedicated stochastic models (hidden variable-order Markov chains) were used to (i) categorise growth units (GUs) on the basis of their morphological characteristics (number of nodes and presence/absence of flowering) and position along axes, (ii) analyse dependencies between successive GUs and (iii) identify repeated patterns in GU sequences. Two successive phases, referred to as ''adolescent'' and ''adult'', were identified in two apple tree cultivars. In the adolescent phase, ''very'' long monocyclic GUs were followed by long polycyclic GUs, whereas in the adult phase medium GUs were preferentially followed by short GUs. Flowering GUs constituted a preferential pathway between vegetative GUs of decreasing vigour (long, medium and short) and generated patterns that were interpreted with respect to fruiting regularity. The proposed modelling gave a global and quantitative picture of the two-scale structuring of apple tree ontogeny: a coarse scale corresponding to the succession of the previously mentioned phases and a fine scale corresponding to the alternation between flowering and vegetative GUs. This led us to propose a synthetic scheme of apple tree ontogeny that combines growth phases, polycyclism and flowering, and which could be transposed to other sympodial trees.

Mots-clés Agrovoc : modèle mathématique, anatomie végétale, développement biologique, arbre, Malus, différenciation sexuelle, floraison

Mots-clés géographiques Agrovoc : Languedoc-Roussillon, France

Mots-clés complémentaires : Architecture des arbres

Classification Agris : U10 - Informatique, mathématiques et statistiques
F62 - Physiologie végétale - Croissance et développement
F50 - Anatomie et morphologie des plantes
F63 - Physiologie végétale - Reproduction

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Costes Evelyne, INRA (FRA)
• Guédon Yann, CIRAD-BIOS-UMR AGAP (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/564074/)

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