Impact d’une modification du transport des sucres sur le développement du système vasculaire chez Arabidopsis thaliana

Abstract : In higher plants, the members of the SWEET transporter family (Sugars Will Eventually be Exported Transporters) transport sugars between and within cells. Previously, it has been shown that SWEET11, SWEET12, SWEET16 and SWEET17promoters are expressed in particular in xylem cells. Moreover, the proteins SWEET11 and SWEET12 have beensuggested to participate in the vascular system stem development. The main purpose of this workwas to better understand the role of SWEET16 and SWEET17 transporters in the vascular system development, especially during the xylem secondary cell wall formation.Arabidopsis thaliana simple, double and triple mutant lines defective in SWEET11, SWEET12, SWEET16, and/or SWEET17 expression were analysed at different scales (ex : stem morphology and xylem anatomy, xylem cell wall composition by infrared spectroscopy, and/or quantification of soluble sugars). Our results suggest that the fructose exported by SWEET17 will be used directly or not for the secondary cell wall biosynthesis in the vessels. On the other hand, SWEET16 could preferentially contribute to the vascular system development by modulating the sugar homeostasis in developing vascular cells.
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Master thesis
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Emilia Aubry. Impact d’une modification du transport des sucres sur le développement du système vasculaire chez Arabidopsis thaliana. Sciences de l'environnement. 2016. ⟨hal-01824621⟩

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