NORONHA, H.; GARCIA, Virginie; SILVA, A.; DELROT, Serge; GALLUSCI, Philippe; GEROS, H.

doi:10.1016/j.plantsci.2021.110984

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NORONHA, H.

GARCIA, Virginie
Ecophysiologie et Génomique Fonctionnelle de la Vigne [UMR EGFV]

SILVA, A.

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Article de revue

Ce document a été publié dans

Plant Science. 2021, vol. 311

Résumé en anglais

Perennial woody plants undergo a period of dormancy from the beginning of autumn until the end of spring. Whereas the molecular and physiological events that characterize dormancy release of buds have been described in detail, those occurring in woody tissues underneath the buds are mostly unknown. To bridge this gap, the mRNA populations of cane segments located underneath the bud were analyzed at bud dormancy (E-L 1) and at bud burst (E-L 4). They revealed an important reprogramming of gene expression suggesting that cell division, cell wall metabolism and the mobilization of sugars are the main metabolic and cellular events occurring in cane woody tissues at bud burst. Also, the upregulation of several genes of sugar metabolism, encoding starch- and sucrose-degrading enzymes and sugar transporters, correlates with the decrease in starch and soluble sugars in woody tissues concomitant with increased sucrose synthase and ?-amylolytic biochemical activities. The latter is likely due to the VviAMY2 gene that encodes a functional ?-amylase as observed after its heterologous expression in yeast. Taken together, these results are consistent with starch and sugar mobilization in canes being primarily involved in grapevine secondary growth initiation and supporting the growth of the emerging bud.< Réduire

URI

https://oskar-bordeaux.fr/handle/20.500.12278/123814

DOI

http://dx.doi.org/10.1016/j.plantsci.2021.110984

Projet Européen

CA17111 - Data integration to maximise the power of omics for grapevine improvement

Unités de recherche

Ecophysiologie et Génomique Fonctionnelle de la Vigne (EGFV) - UMR 1287