Abstract
At storage temperatures of 0°, 3.9°, and 10°C, eight weeks (1,344 h) sufficed to produce maximum budbreak, although termination of rest was generally slower at 10°C. However, at all temperatures studied, three days of storage was sufficient for some budbreak. Resting buds may cause trouble for the grape grower if cuttings are made too early without eight weeks of cold storage. At 37°C, storage longer than three days killed the buds.
Growth of shoots usually preceded root growth. Cuttings stored eight weeks at 0°, 3.9°, and 10° produced shoots respectively, 14, 14, and 25 days earlier than root initiation. Curves for root growth generally followed those for shoots.
There have been a few studies on the effect of low temperatures on termination of bud rest in grapes (2,3,4,5,6,7,8), but the required minimal amount of cold has not been delineated. Our research had three main objectives: 1) to study the effect of length of storage and temperatures on bud rest and time of rooting of grape cuttings, 2) to determine the temperature requirements needed to terminate rest, and 3) to correlate termination of rest with beginning of root growth.
- Accepted February 1977.
- Published online January 1977
- Copyright 1977 by the American Society for Enology and Viticulture
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