Abstract
The cold hardiness of 33 different grapevine genotypes, representing six wild North American grapevine species, one wild Asian grapevine species, and six hybrid grapevines, was evaluated by measuring lethal temperatures for dormant buds using low temperature exotherms. Studies were conducted in three different winters to characterize the relative level of cold hardiness and responsiveness to changing weather patterns of each species. Major differences in the winter conditions during the study demonstrated that wild grapevine has a great capacity for responding to both warm and cold temperature events during the dormant season. Results indicate that wild grapevine species with Northern distributions tend to exhibit greater cold hardiness overall, but also tends to have increased responsiveness to temperature fluctuations. Statistical modeling of low temperature exotherm results across the three winters indicates that each grapevine species has a different and innate capacity for responding to temperature. These results are important for a future of grapevine breeding where increases in winter temperature variation are expected. Additionally, these results demonstrate the potential for genetic determinants of temperature responsiveness that can now be investigated and mapped for future grapevine improvement.
- ©2017 by the American Society for Enology and Viticulture
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