首页> 外文期刊>The Journal of Horticultural Science & Biotechnology >Progression of apple (Malus X domestica Borkh.) bud dormancy in two mild winter climates
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Progression of apple (Malus X domestica Borkh.) bud dormancy in two mild winter climates

机译:在两个温和的冬季气候下苹果(Malus X domestica Borkh。)芽休眠的进程

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One year old, ca. 500 mm long shoots of 'Golden Delicious' and 'Granny Smith' apple were selected randomly from commercial orchards in either Elgin (34 deg S, 305 m, ca. 900 chill units (CU) in 1995) or the Bokkeveld (33 deg S, 945 m, ca. 1500 CU in 1995) regions of the Western Cape, South Africa. Twenty shoots were harvested weekly from 29 March 1995 until 23 August 1995 and forced at a constant 25 deg C with continuous illumination until budburst was observed on four out of 20 shoots per bundle, i.e. days to 20% budburst. The progression of bud dormancy in Elgin differed from that observed in the Bokkeveld. Both cultivars reached maximum dormancy in the Bokkeveld before any considerable chilling accumulated (< 100 CU), but in Elgin, ca. 600 CU accumulated before a maximum was attained. In Elgin temperatures that normally promote chill requirement satisfaction enhanced dormancy. The chilling models used in this study were inadequate in considering climatic conditions involved in the entrance to bud dormancy. In the Bokkeveld, temperatures other than those used to calculate CU induced dormancy - possibly freezing temperatures or frost conditions.
机译:一岁左右。从商业果园中随机选择500毫米长的“黄金美味”和“格兰尼·史密斯”苹果芽,这些果园是在埃尔金(34度,305 m,大约900个冷藏单位(CU),1995年)或Bokkeveld(33度945 m,约1500 CU,1995年)在南非西开普地区。从1995年3月29日至1995年8月23日,每周收获20个芽,并在恒定的25℃下连续照射,直到每捆20个芽中有4个芽发芽,即几天到20%芽发。埃尔金(Elgin)的芽休眠进程与Bokkeveld中观察到的进程不同。在任何大量的冷积累(<100 CU)之前,两个品种都在Bokkeveld达到了最大休眠状态,但是在Elgin,ca。在达到最大值之前累积了600 CU。在埃尔金(Elgin),通常能促进寒冷需求的温度提高了休眠度。本研究中使用的冷却模型不足以考虑芽休眠进入所涉及的气候条件。在Bokkeveld中,除了用于计算CU引起的休眠之外的其他温度-可能是冻结温度或霜冻条件。

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