1. How do water deficits increase wine quality?

3. San Francisco Chronicle June 1, 2007

4. Matthews et al., 1990

5. [or size]
Matthews et al. 1987, 1988, 1989, 1990
Results of water deficit treatments were interpreted as yield treatments and berry size treatments.

7. Fixed amount of stuff / berry?
Total
Antho.?
Size Doubles
Total
Antho.?
Roby et al., 2004

16. Water deficits have direct effects on flavonoid gene expression and metabolism.
The effects of ED on flavonoid gene expression and anthocyanin accumulation were maintained long after vines were released from water deficit.
The increase in 3’,4’,5’ hydroxylated anthocyanins deepens color and puts more of the pigments into forms that resist oxidation and resultant color change.
Water deficits accelerate fruit ripening to maturity.
Sugar accumulation may be required for anthocyanin biosynthesis in grape.

17. Simone Castellarin
Mark Matthews, Gabriele Di Gaspero

18. Thank You! Visit us at: http://matthews.ucdavis.edu
UC Davis Oakville Vineyards, Napa Valley, CA