|
KMID : 0903619720120010001
|
|
Journal of the Korean Society for Horticultural Science
1972 Volume.12 No. 1 p.1 ~ p.13
|
|
|
Effects of High & Low Temperature and Growth Regulators on Rest Breaking of Grape Buds , Campbeil Early (vitis Labruscana . B)
|
|
|
|
|
Abstract
|
|
|
The effects of low and high temperature and chemicals on rest breaking of grape buds and the course of their dormancy were studied with single bud cuttings at control1d temperature from September 1971 to Feburary 1972. The Campbell Early (Vitis labruscana. B) variety was used throughout.
Campbell Early vines in this district have already gone into a deep rest condition at the beginning of September. Grapes seemed to enter into deep rest as soon as the rest period begins. September to the middle of November represented the period of deep rest and thereafter the degree of rest gradually decreased. Bud rest completely disappeared at the end of January and the chilling requirement of Campbell Early vines was approximately 1800 hours below 7℃.
The effect of cold treatment (at 0℃) on rest breaking was cumulative, increasing with the chilling period up to 40 days.
High temperature treatment at 50℃ was effective in breaking rest. The most effective duration of treatment varied with dormancy intensity; 48 hours in November, 24 hours in December 12 hours in January.
Ethrel markedly contributed to accelerate rest breaking, but its effectiveness was closely associated with the stage of rest period. When rest was deep it was less effective, when rest was gradually weakened it was more effective. However when rest was completely broken it led to a delay in bud burst.
Gibberellin showed a strikingly prolonging effect on bud break. Even 1 ppm gibberellin completely prolonged bud burst and nullified the effect of Ethrel on rest breaking. Its effects after cold treatment was less prolonged bud burst.
Kinetin, thiourea, and IAA were not effective in bud burst. Thiourea and IAA (as their concentration increased), actually shoved prolonging of bud burst.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|
|