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Croissance et développement du manguier (Mangifera indica L.) in natura : approche expérimentale et modélisation de l'influence d'un facteur exogène, la température, et de facteurs endogènes architecturaux

Abstract : The aim of this work is to study mango (Mangifera indica L.) growth and development in relation to an exogenous factor, temperature, and to endogenous factors, whether structural (topology) or temporal. The study is carried out at two scales: the organ (vegetative axis, its leaves, and reproductive axis) and the succession of axes (vegetative or reproductive). At the first scale, there was a common negative allometric relationship between the relative growth rate, positively related to temperature, and the duration of growth of the organ. This relationship is common between the three organs and the two studied cultivars. Otherwise, segmentation models reveal that the phenological stages classically studied are characterized by contrasted values of absolute growth rate. This approach shows asynchronisms between the axis and its leaves. At the second scale, the effect of endogenous factors on mango development is investigated for four cultivars. Our results reveal strong interplays between some structural (e.g. axis position, apical vs. lateral) or temporal (e.g. date of burst) factors, and qualitative (e.g. occurrence of flowering), quantitative (e.g. number of inflorescences) or temporal (e.g. date of flowering) developmental traits. These results highlight a "memory of the architectural effect" which spreads from one growing cycle to the followings. Our multiscale study enables to quantify the respective contributions of endogenous and exogenous factors to the phenotypic variations (including plasticity) of mango.
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  • HAL Id : tel-00860484, version 1
  • PRODINRA : 330183

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Anaelle Dambreville. Croissance et développement du manguier (Mangifera indica L.) in natura : approche expérimentale et modélisation de l'influence d'un facteur exogène, la température, et de facteurs endogènes architecturaux. Biologie végétale. Université Montpellier II - Sciences et Techniques du Languedoc, 2012. Français. ⟨NNT : 2012MON20151⟩. ⟨tel-00860484⟩

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