|Authors: ||S.J. Kim, J.C. Nam, S.M. Jung, Y.Y. Hur, H.I. Kim, J.G. Park|
|Keywords: ||cultivation, freezing temperature, injury, LT50, Tmax|
The cold-hardiness of 15 grapevine cultivars was compared in mid-winter (January 2016). The level of cold-hardiness was determined by measuring electrolyte leakage at various freezing temperatures and was expressed as LT50, the temperature at which the incidence of injury reached 50%, and as Tmax, the temperature at which the rate of injury was maximal.
The LT50 and Tmax values for the 15 grape cultivars ranged from -21.9±0.08°C to -38.3±0.13°C and from -12.1±0.05°C to -28.2±0.12°C, respectively.
Tmax values were significantly positively correlated with LT50 values (r=0.90*, P≤0.01). On the basis of their levels of cold-hardiness in terms of LT50 values, the 15 grape cultivars were ranked in the following order: 'Saemaru' › 'Tano Red' › 'Jinok' › 'Shiny Star' › 'Campbell Early' › 'Italia' › 'Hongsodam' › 'Suok' › 'Heukgoosul' › 'Himrod' › 'Heukboseok' › 'Shine Muscat' › 'Kyoho' › 'Hongju Seedless' › 'Perlon'. Similarly, on the basis of their levels of cold-hardiness in terms of Tmax values, the 15 grape cultivars were ranked in the following order: 'Shiny Star' › 'Campbell Early' › 'Hongsodam' › 'Italia' › 'Heukgoosul' › 'Suok' › 'Saemaru' › 'Himrod' › 'Heukboseok' › 'Jinok' › 'Kyoho' › 'Shine Muscat' › 'Tano Red' › 'Hongju Seedless' › 'Perlon'. These results will be useful as practical information for breeding and cultivation of grapevines in Korea.
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