The characteristics of frost resistance in the freezing tests for selection in grapevine breeding programme
1992
Hubackova, M. (Vyzkumna Stanice Vinarska, Karlstejn (CSFR))
During the winters of 1985-1987 and 1986-1987 two frost resistance characteristics were determined in hybrids of Vitis vinifera and in hybrids and varieties with an increased frost resistance (most of them being of interspecific origin). The experiments were performed in programmable freezing boxes. The two characteristics of frost resistance under study were the frost level after a frosty winter period and the level after a warm winter period. Some forms of grapevine were found to have a comparatively high frost resistance after a frosty winter period and a very low frost resistance after a warm period. The results suggest that in breeding for a higher frost resistance it is necessary to respect not only the vine's ability to acquire a high frost resistance under favourable conditions but also the ability to keep the resistance as high as possible after a warmer winter period.
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