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Mieux Contrôler les Fluctuations de Rendement grâce à une Meilleure Compréhension des Mécanismes d’Initiation et de Différenciation des Primordia Inflorescentiels du Bourgeon Latent de Vigne

Abstract : The grape cluster formation determinism remains the one of the undefined phenomena in grapevine physiology process. The topic has been tackled in multiple ways. However, based on all the known information, we still are not allowed to get a synthetic idea of the fundamental mechanisms that produce the appearance of inflorescential primordia in year N-1 and which could govern up to 65 to 70 % of final yield in year N. Our study focuses thus on (i) the characterization of IP formation process in grapevine latent buds (Vitis vinifera L. Merlot) and the redefinition of yield constitution, (ii) understanding IP initiation and differentiation mechanisms, and (iii) evaluating the impacts of different factors (exogenous ABA, light and leaf removal) on these mechanisms.This comprehensive study, which combines multi-scale and multi-disciplinary approaches, firstly allowed us to highlight the determinism of inflorescence induction phase in yield construction by identifying three key phases in IP formation process and by incorporating a new notion which is "IP branching degree". Secondly, it proposed certain modes of regulation of IP initiation and differentiation mechanisms by identifying three types of early markers of bud fruitfulness: molecular markers (VvCLE25-1, VvTFL1a and VvMFT1), biochemical markers (CKs/IAA balance, D-glucose and starch), and environmental markers (cumulative daily sunshine and temperature).The all-inclusive results contribute to the development of an early predictive tool of "bud fruitfulness" (and thereby the probable maximum yield) to better guide and manage the grapevine training and other cultural practices.
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https://tel.archives-ouvertes.fr/tel-01865825
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Submitted on : Sunday, September 2, 2018 - 1:11:58 AM
Last modification on : Thursday, September 3, 2020 - 5:02:28 AM
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  • HAL Id : tel-01865825, version 1

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Anna Li. Mieux Contrôler les Fluctuations de Rendement grâce à une Meilleure Compréhension des Mécanismes d’Initiation et de Différenciation des Primordia Inflorescentiels du Bourgeon Latent de Vigne. Sciences agricoles. Université de Bordeaux, 2017. Français. ⟨NNT : 2017BORD0890⟩. ⟨tel-01865825⟩

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