BACKGROUND:Bud dormancy is a quantitative condition that is gradually acquired and lost. Better and more convenient methods for assessment of the time of dormancy entrance of woody plants are highly needed. OBJECTIVE:To demonstrate a simple and convenient method for determination of dormancy in woody plants. METHODS:We employed a seasonal series of soft tipping of vigorously growing annual shoots and used the loss of ability of subtending lateral buds to break and grow as a measure of entrance into dormancy. RESULTS:There was a gradual decline in the ability of the buds to burst and grow during the month of July and early August, culminating with a complete loss of this ability. This coincided with the known time of growth cessation and dormancy induction in shoots of intact plants and occurred in the berry shrubs raspberry and black currant and the forest tree silver birch. CONCLUSIONS:The decline and loss of ability of the buds to grow during late summer is a direct expression of the entrance of buds into the state of endodormancy, rendering the tipping method a simple and convenient method for precise determination of the time of entrance into dormancy in woody plants.

中文翻译：

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确定木本植物进入休眠状态的简便方法

背景：芽休眠是一种逐渐被获取和丢失的定量条件。迫切需要更好，更方便的方法来评估木本植物的休眠进入时间。目的：证明一种简便的测定木本植物休眠的方法。方法：我们对旺盛生长的一年生芽进行了季节性的软打顶，并利用对侧芽破裂和生长的能力丧失来衡量是否进入休眠。结果：在7月和8月初，芽的爆发和生长能力逐渐下降，最终完全丧失了这种能力。这与完整植物的芽中已知的停止生长和休眠诱导的时间相吻合，并且发生在浆果灌木覆盆子和黑加仑以及林木白桦树中。结论：夏末芽的生长能力的下降和丧失是芽进入内吸状态的直接表现，从而使倾翻法成为精确确定休眠时间的简便方法。在木本植物中。