The objective of this study was to determine how the current (10–16 weeks) and predicted future (2–8 weeks) length of cold stratification and current and predicted future post-stratification temperatures influence radicle and epicotyl emergence in acorns of Quercus robur. We tested radicle and epicotyl emergence at two temperatures corresponding to the current (15/6°C) and predicted future early autumn and spring temperatures (25/15°C) in Poland. We fitted models to describe and derive parameters for radicle and epicotyl emergences over time. The parameters included maximum percentage, rate of emergences, time to achieve the maximum emergence rate, emergence delay and time to 50% emergence. In most cases, the Gompertz model was the best fit, but in a few cases, the logistic model was the best. Richard's model for most of the cases did not converge. This model, according to both information criteria values, was the best fit for epicotyl emergence at 15/6°C following 8 weeks of cold stratification. Richard's model was also the best fit for epicotyl emergence at 25/15°C following 14 weeks of stratification.. Our results indicate that at temperatures typical for early autumn (15/6°C), the time necessary for radicle emergence from 50% of acorns was longer than that from acorns placed at 25/15°C. Four weeks of cold stratification extended 50% radicle emergence at 15/6°C to 70 d, whereas 12 weeks of stratification shortened the time to 11 d. When the acorns were incubated at 25/15°C, radicle emergence occurred faster than at 15/6°C and the time lag between radicle and epicotyl was shorter.

中文翻译：

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有花梗橡树（Quercus robur L.）的橡子胚根和上胚轴出现之间的滞后时间是否取决于冷分层的持续时间和分层后的温度？使用 S 形增长曲线方法建模

本研究的目的是确定冷分层的当前（10-16 周）和预测的未来（2-8 周）长度以及当前和预测的未来分层后温度如何影响橡子中胚根和上胚轴的出现。栎木. 我们在对应于当前 (15/6°C) 的两个温度下测试了胚根和上胚轴的出现，并预测了波兰未来的早秋和春季温度 (25/15°C)。我们拟合模型来描述和推导随着时间的推移胚根和上胚轴出现的参数。参数包括最大百分比、出苗率、达到最大出苗率的时间、出苗延迟和达到 50%出苗的时间。在大多数情况下，Gompertz 模型是最合适的，但在少数情况下，逻辑模型是最好的。大多数情况下，Richard 的模型都没有收敛。根据这两个信息标准值，该模型最适合在 8 周的冷分层后在 15/6°C 下出现上胚轴。Richard 的模型也是分层 14 周后在 25/15°C 时最适合上胚轴出现的模型。我们的研究结果表明，在早秋的典型温度（15/6°C）下，50% 的橡子胚根出现所需的时间比放置在 25/15°C 的橡子长。4 周的冷分层将 15/6°C 下 50% 的胚根出现延长至 70 天，而 12 周的分层将时间缩短至 11 天。当橡子在 25/15°C 下孵育时，胚根的出现比 15/6°C 时更快，胚根和上胚轴之间的时间滞后更短。