Effect of Day Temperature and Light Intensity on Coloration of Vitis vinifera L. Grapes1
Open Access
- 1 November 1970
- journal article
- Published by American Society for Horticultural Science in Journal of the American Society for Horticultural Science
- Vol. 95 (6) , 693-697
- https://doi.org/10.21273/jashs.95.6.693
Abstract
The effects of high (86°F) and low (68°F) day temperature, and of high (2,500 to 5,000 ft-c) and low (500 to 1,200 ft-c) light intensity, on the coloration of ‘Cardinal’ and ‘Pinot noir’ grapes grown in sunlit, temperature-controlled rooms during the ripening period were investigated. Night temperature (7 PM to 7 AM) was 59°F in all treatments. Low day temperature significantly increased the level of anthocyanin pigments in the skins of both cultivars at both high and low light intensity. Anthocyanin synthesis was almost completely inhibited in the skins of ‘Cardinal’ berries that had average daytime temperatures between 91 and 95°F. Low light intensity greatly reduced coloration of ‘Pinot noir’ grapes at both low and high day temperatures but decreased the level of pigments in grapes grown at 86°F. It either increased or had little effect on fruit coloration of ‘Cardinal’ grapes grown at 68°F.Keywords
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