Global variation in nonstructural carbohydrate stores in response to climate
Global variation in nonstructural carbohydrate stores in response to climate
复制标题
DOI：
10.1111/gcb.16573
复制
发表时间：
2022-12
影响因子：
11.6
通讯作者：
M. Blumstein;Jessica T. Gersony;J. Martínez‐Vilalta;A. Sala
中科院分区：
文献类型：
--
作者：
M. Blumstein;Jessica T. Gersony;J. Martínez‐Vilalta;A. Sala
木本植物储存非结构碳水化合物（NSC）以实现多种功能。虽然已知 NSC 存储可以缓冲光合作用供应的波动（例如在夜间），但 NSC 存储也被认为可以通过充当备用能量储备或渗透剂来缓冲极端环境（例如干旱或冰冻温度）。然而，对于气候如何塑造国家安全委员会仍缺乏清晰的认识。在这里，我们更新并利用一个独特的季节性 NSC 存储测量数据库来检查 NSC 存储总量和可溶性糖的最大数量是否与低温或干旱条件下的临床模式相关，表明它们可能在冰冻或干旱条件下带来益处。我们利用每个研究地点的平均气候以及采样时间和地点的独特气候条件来检查模式。总而言之，我们的结果支持 NSC 储存充当关键渗透剂的观点。地上组织中可溶性糖随着寒冷和干燥条件的增加而增加，表明它们可以塑性地提高植物对寒冷或干旱条件的耐受性。然而，最大总 NSC 随平均地点温度的增加而不是减少，并且与平均地点干旱度无关。这一结果表明，植物储存的 NSC 总量可能更取决于其吸收碳的能力，而不是环境压力。因此，NSC 不太可能充当能量储存库。这项研究是迄今为止对全球 NSC 变化与气候相关的最全面的综合，并支持 NSC 储存可能充当环境压力缓冲器的观点。通过阐明它们在耐寒和耐旱方面的作用，我们提高了预测植物对环境反应的能力。
Woody plant species store nonstructural carbohydrates (NSCs) for many functions. While known to buffer against fluctuations in photosynthetic supply, such as at night, NSC stores are also thought to buffer against environmental extremes, such as drought or freezing temperatures by serving as either back‐up energy reserves or osmolytes. However, a clear picture of how NSCs are shaped by climate is still lacking. Here, we update and leverage a unique global database of seasonal NSC storage measurements to examine whether maximum total NSC stores and the amount of soluble sugars are associated with clinal patterns in low temperatures or aridity, indicating they may confer a benefit under freezing or drought conditions. We examine patterns using the average climate at each study site and the unique climatic conditions at the time and place in which the sample was taken. Altogether, our results support the idea that NSC stores act as critical osmolytes. Soluble Sugars increase with both colder and drier conditions in aboveground tissues, indicating they can plastically increase a plants' tolerance of cold or arid conditions. However, maximum total NSCs increased, rather than decreased, with average site temperature and had no relationship to average site aridity. This result suggests that the total amount of NSC a plant stores may be more strongly determined by its capacity to assimilate carbon than by environmental stress. Thus, NSCs are unlikely to serve as reservoir of energy. This study is the most comprehensive synthesis to date of global NSC variation in relation to climate and supports the idea that NSC stores likely serve as buffers against environmental stress. By clarifying their role in cold and drought tolerance, we improve our ability to predict plant response to environment.