Laboratory Plants and Ecosystems (PLECO), Department of Biology, University of Antwerp, Universiteitsplein 1, Wilrijk B-2610, Belgium.
Laboratory for Integrated Molecular Plant Physiology Research (IMPRES), Department of Biology, University of Antwerp, Groenenborgerlaan 171, Antwerp 2020, Belgium.
Tree Physiol. 2023 Oct 8;43(10):1718-1730. doi: 10.1093/treephys/tpad080.
The current state of knowledge on bud dormancy is limited. However, expanding such knowledge is crucial in order to properly model forest responses and feedback to future climate. Recent studies have shown that warming can decrease chilling accumulation and increase dormancy depth, thereby inducing delayed budburst in European beech (Fagus sylvatica L). Whether fall warming can advance spring phenology is unclear. To investigate the effect of warming on endodormancy of deciduous trees, we tested the impact of mild elevated temperature (+2.5-3.5 °C; temperature, on average, kept at 10 °C) in mid and late autumn on the bud dormancy depth and spring phenology of beech. We studied saplings by inducing periods of warming in greenhouses over a 2-year period. Even though warming reduced chilling accumulation in both years, we observed that the response of dormancy depth and spring budburst were year-specific. We found that warming during endodormancy peak could decrease the bud dormancy depth and therefore advance spring budburst. This effect appears to be modulated by factors such as the date of senescence onset and forcing intensity during endodormancy. Results from this study suggest that not only chilling but also forcing controls bud development during endodormancy and that extra forcing in autumn can offset reduced chilling.
目前对芽休眠的认识有限。然而，为了正确模拟森林对未来气候的响应和反馈，扩展这种知识是至关重要的。最近的研究表明，变暖可以减少需冷量积累并增加休眠深度，从而导致欧洲山毛榉（Fagus sylvatica L）的芽萌发延迟。秋季变暖是否可以提前春季物候期尚不清楚。为了研究变暖对落叶树休眠的影响，我们测试了秋季中期和后期温和增温（+2.5-3.5°C；平均温度保持在 10°C）对山毛榉芽休眠深度和春季物候的影响。我们通过在 2 年内的温室中诱导增温期来研究幼苗。尽管增温在两年中都减少了需冷量积累，但我们观察到休眠深度和春季芽萌发的反应是特定于年份的。我们发现，休眠高峰期的增温可以降低芽休眠深度，从而提前春季芽萌发。这种效应似乎受到衰老起始日期和休眠期间强迫强度等因素的调节。本研究的结果表明，不仅是需冷量，强迫也控制着休眠期间的芽发育，秋季的额外强迫可以抵消减少的需冷量。
