Morphogenetic trends in the morphological, optical and biochemical features of phyllodes in Acacia mangium Willd (Mimosaceae) |
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Authors: | Céline Leroy Michael Guéroult Novi Sari Wahyuni Jacques Escoute Régis Céréghino Sylvie Sabatier Daniel Auclair |
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Institution: | 1. INRA, UMR AMAP, 34000, Montpellier, France 2. Université Paul Sabatier, UMR EDB, 31062, Toulouse, France 3. Universitas Brawijaya, Fakultas Pertanian, Malang, Indonesia 4. CIRAD, UMR DAP, 34000, Montpellier, France 5. Université Paul Sabatier, UMR Ecolab, 31062, Toulouse, France 6. CIRAD, UMR AMAP, 34000, Montpellier, France 7. CIRAD, UMR AMAP (botAnique et bioinforMatique de l’Architecture des Plantes), TA A-51/PS2, Bd. de la Lironde, 34398, Montpellier Cedex 5, France
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Abstract: | 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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Keywords: | Chlorophyll Phyllode morphology Phyllode anatomy Nitrogen Optical properties Plant architecture |
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