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- Author or Editor: L. E. Powell x
- HortScience x
Abstract
Perennial woody plants of the temperate zone typically are challenged each winter by freezing temperatures. Their capacity to survive these winter temperatures is due in part to an evolved dormancy mechanism, often called rest. This mechanism exerts a commanding influence on growth and development. The physiology of rest has been studied extensively and much is known, but its more basic biochemical aspects are little understood. It is commonly assumed to be hormonally controlled. This review will summarize the physiological aspects of the rest mechanism and the evidence for hormonal involvement.
Abstract
Bud explants of apple (Malus domestica Bork.) grown aseptically in vitro have been shown to respond to several chemicals in a manner similar to intact trees treated with the same chemicals, except that much lower concentrations are required. The method should be useful as a screening test for chemicals which have shoot-regulatory properties.
Hydrogen cyanamide (Dormex) treatments were applied to 17 insufficiently chilled peach and nectarine cultivars ≈6 weeks after normal budbreak. Treatment effectively induced vegetative budbreak and reduced shoot dieback. The responses to Dormex treatments were linear, with the 2% rate being more effective than the 0 and 1% rates in most cases.