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Bases moléculaires de la floraison chez le rosier

Abstract : In perennial plants, molecular control of flowering is still poorly understood. Up to now, flowering control is well described in monocarpic model plants like Arabidopsis thaliana. Gibberellic acids (GA) pathway play an important role in flowering time in monocarpic and physiological study shows that GA inhibit blooming only in non recurrent roses. Recurrent blooming might be explained by a different regulation of floral initiation gene networks using the same known genes or it might involve new unkown genes. The objectives of this work are to isolate and characterise the genes involved in the control of flowering and more precisely of recurrent blooming in rose. Floral initiation is studied at the phenotypic and molecular level in four different genotypes, two of them are a pair of mutants for recurrent blooming. Using a candidate gene approach, we isolated flowering genes, and new candidates are looked for by differential display experiment. In spring, rapidly after bud outgrowth, modifications associated with the floral transition (doming and enlargement of the apex) are observed. Homologues of key floral genes (FT, AP1) are induced. Moreover, homologues of GA metabolism genes are regulated during the floral transition. New potential candidates for floral initiation and recurrent blooming are proposed. Genes controlling flowering time in Arabidopsis thaliana seem to be conserved in rose and the GA pathway could play a key role in the control of floral initiation (GA metabolism) and recurrent blooming (GA signalling). Further analysis and functional validations should precise the role of those genes in recurrent blooming process and their common features with floral initiation of annual plants.
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Submitted on : Saturday, June 6, 2020 - 11:15:07 PM
Last modification on : Friday, September 30, 2022 - 11:26:51 AM


  • HAL Id : tel-02824965, version 1
  • PRODINRA : 34125


Arnaud A. Remay. Bases moléculaires de la floraison chez le rosier. Sciences du Vivant [q-bio]. Université d'Angers, 2009. Français. ⟨NNT : ⟩. ⟨tel-02824965⟩



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