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Published on December 29, 2005; 10.1104/pp.105.067231

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Received June 17, 2005
Returned for revision July 22, 2005
Accepted December 6, 2005

Characterization of a grapevine R2R3-MYB transcription factor that regulates the phenylpropanoid pathway

Laurent Deluc , François Barrieu , Chloé Marchive , Virginie Lauvergeat , Alain Decendit , Tristan Richard , Jean-Pierre Carde , Jean-Michel Mérillon , and Saïd Hamdi *

UMR 619 Physiologie et Biotechnologie Végétales - Université Bordeaux1, Université Bordeaux 2, INRA - Centre INRA de Bordeaux - BP 81, 33883 Villenave d'Ornon, France
Laboratoire de Mycologie et de Biotechnologie Végétale EA3675, UFR Pharmacie 146 rue Leo-Saignat, Université Bordeaux 2, France

* Corresponding author; email: said.hamdi{at}bordeaux.inra.fr.

The ripening of grape (Vitis vinifera L.) berry is characterized by dramatic changes in gene expression, enzymatic activities and metabolism which lead to the production of compounds essential for berry quality. The phenylpropanoid metabolic pathway is one of the components involved in these changes. In this paper, we describe the cloning and functional characterization of VvMYB5a, a cDNA isolated from a Vitis vinifera L. cv. Cabernet Sauvignon berry library. VvMYB5a encodes a protein belonging to a small sub-family of R2R3-MYB transcription factors. Expression studies in grapevine indicate that the VvMYB5a gene is mainly expressed during the early steps of berry development in skin, flesh and seeds. Overexpression of VvMYB5a in tobacco affects the expression of structural genes controlling the synthesis of phenylpropanoid and impacts on the metabolism of anthocyanins, flavonols, tannins and lignins. Overexpressing VvMYB5a induces a strong accumulation of several phenolic compounds including keracyanin (cyanidin 3 rhamnoglucoside) and quercetin 3 rhamnoglucoside, which are the main anthocyanin and flavonol compounds in tobacco. In addition, VvMYB5a overexpression increases the biosynthesis of condensed tannins and alters lignin metabolism. These findings suggest that VvMYB5a may be involved in the control of different branches of the phenylpropanoid pathway in grapevine.




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