Department of Plant Breeding, CEBAS-CSIC, Campus Universitario de Espinardo, Murcia, Spain.
Plant Biol (Stuttg). 2013 Jan;15 Suppl 1:28-35. doi: 10.1111/j.1438-8677.2012.00636.x. Epub 2012 Jul 30.
Our aim was to assess the possible differential effect of increasing temperatures due to global warming on dormancy progression in apricot. The effect of a range of chilling temperatures on vegetative and reproductive bud dormancy progression in excised shoots was examined during two seasons. Temperature treatments were applied in different dormant stages to evaluate the possible interaction of date × temperature for dormancy release in apricot. During sampling, chill accumulated in the field ranged from 0 to 49 chill portions (CPs), corresponding to 0-100% of the chilling requirement (CR) of the apricot selection Z505-2. Forcing conditions were applied after a 60-day chill treatment on each sampling date, and rate to budbreak (1/mean time to bud break: MTB(-1) ) was established in vegetative (terminal and lateral) and reproductive buds to determine depth of dormancy. Results showed that the stage of dormancy has a strong influence on the effect of different temperatures on dormancy progression in apricot. For the first time, a non-linear effect of different chilling temperatures during the dormancy cycle in apricot was obtained, especially in the superior range of temperatures traditionally considered to release dormancy. Thus, introduction of this differential effect could help to improve the models to estimate dormancy release in the context of climate change.
我们的目的是评估由于全球变暖导致的温度升高对杏休眠进程的可能差异影响。在两个季节中，检查了一系列冷藏温度对离体枝条营养和生殖芽休眠进程的影响。在休眠阶段的不同时间施加温度处理，以评估杏休眠解除中日期×温度的可能相互作用。在采样过程中，田间积累的冷量范围为 0 到 49 个冷量部分（CPs），相当于杏品种 Z505-2 冷藏要求（CR）的 0-100%。在每个采样日期的 60 天冷藏处理后进行强制处理，并在营养（顶端和侧芽）和生殖芽中建立芽裂率（1/平均芽裂时间：MTB(-1)），以确定休眠深度。结果表明，休眠阶段对不同温度对杏休眠进程的影响有很大影响。这是首次在杏休眠周期中获得不同冷藏温度的非线性影响，尤其是在传统上被认为可以解除休眠的较高温度范围内。因此，引入这种差异效应可以帮助改进模型，以在气候变化背景下估计休眠解除。
