@article {Kliewer119, author = {W. M. Kliewer and H. B. Schultz}, title = {Influence of Environment on Metabolism of Organic Acids and Carbohydrates in Vitis Vinifera. II. Light}, volume = {15}, number = {3}, pages = {119--129}, year = {1964}, doi = {10.5344/ajev.1964.15.3.119}, publisher = {American Journal of Enology and Viticulture}, abstract = {Radioactive CO2 was administered to shoots of White Riesling growing in the field af two stages of maturity and under three different light conditions: ful sunlight and shaded vines receiving approximately 20 and 30\% of full sunlight. The amount of C14O2 incorporated into organic acids and sugars from both immature and nearly ripe berries grown under different light conditions was determined over a period of 32 to 80 hours.Berries from 21\% sun had more label in the organic acid fraction and less in the sugar fractions than berries from 30\% or 100\% sun. The amount of C14O2 incorporated into malic acid was usually relatively greater from shaded berries; tartaric acid, on the other hand, contained a greater proportion of the label with 100\% sun.Immature shaded berries contained a relatively greater amount of label in sucrose and a decreased amount in glucose and fructose, but this relationship was reversed in mature shaded berries. Mature shaded berries contained a relatively smaller amount of label in sucrose than unshaded berries. The proportion of activity in glucose and fructose was not greatly influenced by the amount of sun.}, issn = {0002-9254}, URL = {https://www.ajevonline.org/content/15/3/119}, eprint = {https://www.ajevonline.org/content/15/3/119.full.pdf}, journal = {American Journal of Enology and Viticulture} }