Project title
Relationship between Shiraz/R99 water relations and physiological and developmental changes in the berry

Project leader
Hunter, J J

Institution
ARC Infruitec-Nietvoorbij

Project description
The regulation of grapevine water status is critical in obtaining a quality product. The objective of this investigation is to determine the effect of plant water status and ripeness level on grape structure and composition in view of the latest knowledge and thoughts on the factors involved in source:sink mechanisms, sugar accumulation and physical changes, e.g. during berry shrinking at high soluble solid levels. The vine physiological, viticultural and oenological differences induced by variation in plant water status will be quantified at different ripeness levels and recommendations on management required to obtain different styles of grape and wine composition under varying vine water status levels will be made. Combined effects of water status and ripeness level have not yet been systematically investigated in terms of the induction of morphological, structural, and physiological changes in the grapevine and grapes and the eventual impact on wine. It is absolutely important that vineyard and grape potential be fully explored; studies at different ripeness levels add a further dimension to our quest for top quality and different styles of wine.

Presentation(s)
1. Hunter, J J and Deloire, A. 2005. Relationship between sugar loading and berry size of ripening Syrah/R99 grapes as affected by grapevine water status. GESCO Symposium, 23-27 August, Geisenheim, Germany.
2. Deloire, A, Kraeva, E, Martin, M and Hunter, J J. 2005. Berry sugar loading and anthocyanin content as affected by bunch microclimate of Syrah/R99. GESCO Symposium, 23-17 August, Geisenheim, Germany.
3. Hunter, J J. 2005. Optimal Ripeness: Effect of environment, cultivation and grape quality management. 2 September. University of Turin, Italy.
4. Hunter, J J. 2005. Strategies for improving optimal grape ripeness for winemaking. University of Palermo. 11 October. Sicily, Italy.
5. Hunter, J J. 2006. Vine water relation effects on grape ripening and wine quality. 29th National Congress of the South African Society for Enology and Viticulture. November. Somerset West, South Africa.
6. Nadal, M and Hunter, J J. 2006. The effect of ripeness levels on wine style and quality. November. 29th National Congress of the South African Society for Enology and Viticulture. Somerset West, South Africa.
7. Hunter, J J and Deloire, A. 2006. Terroir and vine water relation effects on grape ripening and wine quality of Syrah/R99. 6th International Terroir Congress. 3-7 July. Bordeaux, France.
8. Pisciotta, A, Barbagallo, M G, Di Lorenzo, R, Lo Vetere, R and Hunter, J J. 2006. Effect of tipping and topping on shoot uniformity: preliminary results on single cordon trained Cabernet Sauvignon and Merlot. ISHS Conference, Venosa, Italy.
9. Nadal, M and Hunter, J J. 2007. Different wine styles as related to ripeness level of Syrah/R99 grapes. International Intervitis Interfructa Congress, Stuttgart, Germany.

Deloire, A, Ojeda, H, Zebic, O, Bernard, N, Hunter, J J, Carbonneau, A. 2005. Influence of grapevine water stress on the style of wine. Progres Agricole et Viticole. v. 122 n. 21 p. 11-15

Article

Deloire, A, Zebic, O, Barnardt, N, Brenon, E, Hunter, J J. 2005. Influence de l'état hydrique de la vigne sur le qualité de vin. Revue Francaise d'Oenologie. v. 6 p. 11-15

Cloete, H, Archer, E, Hunter, J J. 2008. Shoot heterogeneity effects on Shiraz/R99 grapevines. Part I. Vegetative growth. South African Journal of Enology + Viticulture. v. 27 n. 1 p. 68-75

Cloete, H, Archer, E, Novello, V, Hunter, J J. 2008. Shoot heterogeneity effects on Shiraz/R99 grapevines. Part II. Physiological activity. South African Journal of Enology + Viticulture. v. 29 n. 1 p. 1-8

Cloete, H, Archer, E, Novello, V, Hunter, J J. 2008. Shoot heterogeneity effects on Shiraz/R99 grapevines. Part III. Leaf chlorophyll content. South African Journal of Enology + Viticulture. v. 29 n. 1 p. 9-12

Deloire, A, Kraeva, E, Martin, M, Hunter, J J. 2005. Sugar loading and phenolic accumulation as affected by ripeness level of Syrah/R99 grapes. IN: Proceedings of GESCO Conference, 23-27 August, Geisenheim, Germany. n. 574-580

Chapter

Hunter, J J, Deloire, A. 2005. Relationship between sugar loading and berry size of ripening Syrah/R99 grapes as affected by grapevine water status. IN: Proceedings of GESCO Conference, 23-27 August, Geisenheim, Germany. p. 127-133

Hunter, J J, Deloire, A. 2006. Terroir and vine water relation effects on grape ripening and wine quality of Syrah/R99. IN: Proceedings of the Terroir Conference, July, Bordeaux and Montpellier, France. p. 110-116

Nadal, M, Hunter, J J. 2007. Different wine styles as related to ripeness level of Syrah/R99 grapes. IN: Proceedings of the International Intervitis Interfructa Congress. Stuttgart, Germany. p. 139-148

Giacalone, C. 2008. Traslocazione dei metaboliti durante la maturazione dell'uva in Vitis vinifera L: effetti dell'anulazione del germoglio. (Ph.D)

Dissertation

Ellis, W. 2008. Grapevine (Shiraz/Richter 99) water relations during berry ripening. (M.Sc.)

Thesis

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