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Influence of Ethylene on Sucrose Accumulation in Grape Berry

¹ UMR 990, Génomique et Biotechnologie des Fruits, Centre INRA de Toulouse, BP 32607, 31326 Castanet, France; and ² UMR 1083, Science Pour l’Oenologie, Centre INRA/Agro-M, 2 Place Viala, 34060 Montpellier cedex 01, France.

^* Corresponding author [email: chervin{at}ensat.fr; tel/fax: 33 5 6219 35753]

Grape ripening is thought to be ethylene independent. However, Cabernet Sauvignon berries that were treated with 1-methylcyclopropene, a specific inhibitor of ethylene receptors, accumulated less sucrose than did controls over the following three weeks. This decreased sucrose accumulation was associated with a decreased RNA accumulation of two sucrose transporters (SUC11 and SUC12), whose expression is triggered at veraison when grape berries start to accumulate sugars. This preliminary study was performed over two consecutive years and suggests that the role of ethylene in grape ripening needs to be reconsidered and that it could be related to sugar accumulation.

Key words: grapevine, Vitis vinifera, ethylene signaling, sucrose transport, ripening