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Geographic trend of bud hardiness response in Vitis Riparia
- Londo, J., Martinson, T.
- Acta horticulturae 2015 no.1082 pp. 299-304
- Vitis riparia, Vitis vinifera, breeding, climate, cold tolerance, cultivars, cutting, dormancy, genotype, phenotype, temperature, thermal analysis, winter
- A major goal of grapevine breeding efforts for production outside of Mediterranean climates is the production of cultivars that have cold tolerance phenotypes. Typically, grapevine breeders use midwinter bud hardiness measures as the descriptive phenotype for cold tolerance. Historical practices of bud cutting and more modern day differential thermal analysis of low temperature exotherms allows for an accurate, quantitative measure of bud hardiness. In our recent studies we have examined the relationship between cold hardiness and dormancy requirements, and our results preliminarily suggest a geographic pattern associated with dormant tissue temperature response and midwinter hardiness in Vitis riparia. The data presented here represent two years of hardiness measures for different Vitis riparia and Vitis vinifera genotypes.