ISHS Acta Horticulturae 120: Symposium on Growth Regulators in Fruit Production
EFFECT OF HEAT ON BUD-BREAK IN APPLE |
| Authors: | H. Huang, Loyd E. Powell |
| Abstract:
Apple shoots of cultivars requiring low, intermediate and high chilling were excised from trees in the orchard in late November 1979, packed in damp peat moss and stored at 4°C. Shoot samples were removed from the peat at approximately monthly intervals through early April, held at 25°C in containers of water and observed over a 3 week period. Similar samples, chilled for various time periods, were placed in waterproof plastic bags, immersed in water and given a heat treatment of 39°C for 2 hours to test the ability of heat to overcome dormancy due to insufficient chilling. (Longer heating periods of 4 and 6 hours at 39° were tried without additional benefit). Observations were made for bud break as well as vigor of growth from brusting buds. | |
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