Data from a drought experiment on Corylus avellana (Belgian and Spanish origin) and Corylus maxima (Belgian origin)

These data are gathered during a drought experiment on Corylus taxa. We follow: https://www.vlaanderen.be/inbo/normen-voor-datagebruik/ This is the abstract of the submitted manuscript: Background: "Understanding the mechanisms by which woody perennials adapt to extreme water deficits is important in regions experiencing increasingly frequent and intense droughts. Methods: We investigated the effects of drought severity in the shrubs Corylus avellana, C. maxima and their morphological intermediate forms, all from local Belgian origin, and C. avellana from a Spanish-Pyrenean origin. Potted saplings in a common garden setting were not receiving any water during 30 days in July 2021 and developed a range of visual stress symptoms. We assessed responses across the various symptom categories. Results: Droughted plants senesced later than the controls (up to 6 days), with the most severely affected plants displaying the largest delay (21 days). Severity of visual drought symptoms and delay in leaf senescence did not show a linear relation. However, the delay in leaf senescence was reflected in the subsequent bud burst which was delayed for the drought treated plants, with again the largest delay for the most severely affected plants. Interestingly, radial growth shifted towards the autumn among the drought treated plants, suggesting compensation growth after growing conditions normalized. The Spanish-Pyrenean provenance, characterized by smaller plants with smaller leaves, developed visual drought symptoms later than the local provenance during the drought. Conclusions: The results indicate that severe early summer drought, followed by rewatering, not only diminishes radial growth but also prolongs it in time, and delays leaf senescence, both influencing carbon sequestration. Provenances adapted to high altitudes may hold an advantage under water limiting conditions."本数据集采集自榛属（Corylus）类群的干旱胁迫实验，实验遵循以下规范：https://www.vlaanderen.be/inbo/normen-voor-datagebruik/ 以下为已投稿手稿的摘要： **背景**：在干旱事件愈发频繁且强度不断加剧的区域，解析木本多年生植物适应极端水分亏缺的内在机制具有重要意义。 **方法**：本研究探究了干旱胁迫程度对欧洲榛（Corylus avellana）、大果榛（Corylus maxima）及其比利时本土来源的形态中间型，以及西班牙-比利牛斯山来源的欧洲榛的影响。实验于2021年7月在同质园环境中开展，将盆栽实生苗进行为期30天的停水处理，植株由此产生一系列可见的胁迫症状。我们对不同症状类别下的植株响应进行了评估。 **结果**：干旱处理植株的叶片衰老时间较对照组延后（最长可达6天），受害最严重的植株衰老延迟幅度最大（达21天）。可见干旱症状严重程度与叶片衰老延迟并未呈现线性相关关系。但叶片衰老延迟现象可通过后续的芽萌动延迟得到体现：干旱处理组植株的芽萌动时间均出现延后，其中受害最严重的植株延后幅度最大。值得注意的是，干旱处理组植株的径向生长转向秋季，这暗示在生长条件恢复正常后，植株存在补偿性生长。相较于本土种源，以植株更小、叶片更小为特征的西班牙-比利牛斯山种源，在干旱胁迫期间出现可见干旱症状的时间更晚。 **结论**：研究结果表明，初夏重度干旱胁迫后复水，不仅会抑制植株径向生长，还会延长其生长周期，同时延迟叶片衰老，上述过程均会对碳固存产生影响。适应高海拔环境的种源，在水分限制条件下可能具备生长优势。