Effect of temperature on the induction of bud dormancy in ecotypes of Betula pubescens and Betula pendula
Effect of temperature on the induction of bud dormancy in ecotypes of Betula pubescens and Betula pendula
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DOI：
10.1080/02827580308624
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发表时间：
2003-01-01
影响因子：
1.8
通讯作者：
Igeland, B
中科院分区：
文献类型：
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作者：
Junttila, O;Nilsen, J;Igeland, B
本研究的目的是确定短日照诱导芽蕾过程中施加的温度对毛桦六种生态型休眠诱导的影响。以及垂枝桦的两个生态型。在休眠诱导期间，幼苗在 9-21 摄氏度恒温、12 小时光周期 (SD) 的植物加速器中生长。转移至18℃长光周期条件（24小时）后，通过芽冲洗和枝条生长来监测休眠的诱导。研究了暴露于 10 周 SD 的幼苗的需冷量。在这两种物种中，芽休眠的诱导在15-18℃下发展得最快，并且9-12℃和21℃都延迟了休眠的诱导。提高休眠诱导期间的温度（从 9 摄氏度到 21 摄氏度）显着增加了冷藏需求。所有测试的生态型都注意到了这些反应，但总的来说，北部生态型比南部生态型更快地进入休眠状态。尽管来自冰岛的毛毛竹生态型和来自挪威北部海岸的另一种生态型似乎比其他生态型需要更长的冷冻处理时间，但在冷冻需求方面没有记录到这种趋势。总之，桦树芽休眠的诱导和深度受温度条件的显着影响，这些影响可以解释自然界中观察到的休眠和需冷量的一些年度变化。
The purpose of this study was to determine the influence of temperature applied during short day-induced budset on induction of dormancy in six ecotypes of Betula pubescens Ehrh. and two ecotypes of Betula pendula Roth. Seedlings were grown in a phytotron at constant temperatures of 9 - 21 degreesC under a 12 h photoperiod (SD) during dormancy induction. Induction of dormancy was monitored by following bud flushing and shoot growth after transfer to long photoperiod conditions (24 h) at 18 degreesC. Chilling requirement was studied in seedlings exposed to 10 weeks of SD. In both species induction of bud dormancy developed most rapidly at 15 - 18 degreesC, and both 9 - 12 degreesC and 21 degreesC delayed the induction of dormancy. Raising the temperature (from 9 to 21 degreesC) applied during induction of dormancy significantly increased the chilling requirement. These responses were noted for all ecotypes tested, but in general the northern ecotypes entered dormancy more quickly than the southern ones. No such trend was recorded for chilling requirement, although a B. pubescens ecotype from Iceland and another from the coast of northern Norway appeared to require a longer chilling treatment than the other ecotypes. In conclusion, induction and depth of bud dormancy in birch are significantly affected by temperature conditions and these effects may explain some of the annual variation in dormancy and chilling requirement observed in nature.