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| HAL : halsde-00374857, version 1 |
| DOI : 10.1007/s00468-008-0252-5 |
| Fiche détaillée |  Récupérer au format |
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| Trees - Structure and Function 23, 1 (2009) 37-49 |
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| Morphogenetic trends in the morphological, optical and biochemical features of phyllodes in Acacia mangium Willd (Mimosaceae) |
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| Céline Leroy 1Michael Guéroult 1 |
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| (2009) |
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| Endogenous variations in the annual growth of trees suggest that similar trends would occur in phyllodes. In comparison to leaves, the characteristics of phyllodes are less well known, hence this study examines the effects of architectural position and age of tree on the phyllodes of Acacia mangium. Phyllodes were investigated on 1-, 2-, and 3-year-old trees from three axis positions within the crown. We focused on the morphological, optical and biochemical traits of the phyllodes. The increase in phyllode area and lamina thickness is more pronounced in the older trees. Leaf mass area (LMA), stomatal density, nitrogen and chlorophyll content increase with tree age. The values of these characteristics decrease from the main stem to the lower branches for the older trees. Phyllode light absorptance increased with tree age whereas reflectance was higher for the upper position compared to the lower position within the crown. Carotenoid content and chlorophyll a/b ratio were higher for the younger phyllodes of younger trees. Increasing tree size induced modifications in the phyllode characteristics which are influenced by both morphogenetic and light gradients within the crown. This study demonstrated pronounced changes in terms of morphological and functional indicators of photosynthetic capacity in relation to phyllode position within the crown and to tree age. These morphogenetic effects on the phyllode characteristics should be taken into account in studies on phenotypic plasticity. |
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| 1 : | BotAnique et BioinforMatique de l'Architecture des Plantes (AMAP) |
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Centre de coopération internationale en recherche agronomique pour le développement [CIRAD] : UMR51 – CNRS : UMR5120 – Institut de recherche pour le développement [IRD] – Institut national de la recherche agronomique (INRA) : UR0931 – Université Montpellier II - Sciences et techniques |
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| 2 : | Développement et amélioration des plantes (DAP) |
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Centre de coopération internationale en recherche agronomique pour le développement [CIRAD] : UMR96 – Institut national de la recherche agronomique (INRA) – Institut de recherche pour le développement [IRD] – CNRS – Université Montpellier II - Sciences et techniques |
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| 3 : | Laboratoire Ecologie Fonctionnelle et Environnement (EcoLab) |
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PRES Université de Toulouse – Institut National Polytechnique de Toulouse - INPT – Université Paul Sabatier [UPS] - Toulouse III – Observatoire Midi-Pyrénées – CNRS : UMR5245 |
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| domaine | : | Sciences de l'environnement/Biodiversité et Ecologie Sciences du Vivant/Biologie végétale |
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| Chlorophyll – Phyllode morphology – Phyllode anatomy – Nitrogen – Optical properties – Plant architecture |
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| halsde-00374857, version 1 | |
| http://hal-sde.archives-ouvertes.fr/halsde-00374857 | |
| oai:hal-sde.archives-ouvertes.fr:halsde-00374857 | |
| Contributeur : Yannick Brohard | |
| Soumis le : Vendredi 10 Avril 2009, 08:59:50 | |
| Dernière modification le : Mardi 11 Août 2009, 18:48:31 | |
