PT  - JOURNAL ARTICLE
AU  - David D. Crippen, Jr.
AU  - Janice C. Morrison
TI  - The Effects of Sun Exposure on the Compositional Development of Cabernet Sauvignon Berries
AID  - 10.5344/ajev.1986.37.4.235
DP  - 1986 Jan 01
TA  - American Journal of Enology and Viticulture
PG  - 235--242
VI  - 37
IP  - 4
4099  - http://www.ajevonline.org/content/37/4/235.short
4100  - http://www.ajevonline.org/content/37/4/235.full
SO  - Am J Enol Vitic.1986 Jan 01; 37
AB  - The effects of sunlight on Cabernet Sauvignon fruit clusters were studied in a Napa Valley, California, commercial vineyard. Clusters were chosen from sun-exposed locations and from locations shaded by the grapevine canopy. Selected exposed and shaded clusters on one vine were monitored for air temperature and light flux. Berry samples were collected weekly from anthesis and were analyzed for tartrate, malate, glucose, and fructose by HPLC and for potassium by emission spectroscopy. Berry juice was also analyzed for pH, titratable acidity, and soluble solids content. Data were presented both on a concentration basis (mg/g fresh weight) and on a per berry basis (mg/berry). Sun berries were significantly higher in concentrations of tartrate, malate, glucose, and fructose as shown by analysis of variance. No significant differences were found when expressed on a per berry basis, however. Potassium expressed either as concentration or per berry, pH, titratable acidity, and soluble solids showed no significant differences between sun and shade berries. Berries from the canopy shade were significantly heavier than berries exposed to the sun. The observed differences in concentration were attributed to a higher water content in the berries from shaded clusters.