Due to the increasing occurrence of drought events, drought recovery has become equally important as drought resistance for long-term growth and survival of plants. However, information regarding the mechanism that controls growth recovery of herbaceous perennials is not available. In this study, perennial ryegrass (Lolium perenne) was rewatered after eight-day exposure to three drought intensities simulated by polyethylene glycol-6000. The growth, nonstructural carbohydrates (NSC, i.e. sucrose, glucose, fructose and starch), shoot δ¹³C, and activities of enzymes for sucrose conversion were monitored for 24 days after rewatering, allowing investigation of the dynamic of NSCs and its relation with growth in the recovery phase. In response to drought, growth and NSC content decreased mainly in shoot rather than root, and the total dry matter was negatively correlated to shoot δ¹³C. After rewatering, the growth of drought-treated groups still lagged behind that of control (CK) group for more than 16 days, but it was no longer correlated to shoot δ¹³C, suggesting that the limited growth is caused by non-stomatal factors related to photosynthesis. On day 24 after rewatering, the final growth of drought-treated groups caught up or even exceeded that of CK group, and was accompanied by higher dry weight root to shoot ratio (R/S) and root NSC content, which may facilitate water and nutrient acquisition and emergency of new tillers, respectively. During drought and subsequent recovery, the variation of R/S and root NSC content mainly attributed to root acid invertase rather than leaf sucrose phosphate synthase activity.

由于干旱事件的发生越来越多，对于植物的长期生长和存活，干旱恢复与抗旱性同样重要。但是，尚无有关控制多年生草本植物生长恢复的机制的信息。在这项研究中，将多年生黑麦草（黑麦草）在暴露于聚乙二醇-6000模拟的三种干旱强度下八天后再浇水。生长，非结构性碳水化合物（NSC，即蔗糖，葡萄糖，果糖和淀粉），拍摄δ ¹³C，再浇水后24天内监测蔗糖转化酶的活性，从而研究NSC的动态及其与恢复阶段生长的关系。响应于干旱，生长和NSC含量下降主要是在地上，而不是根，总干物质到拍摄负相关δ ¹³复水后C.，仍然落后于控制的干旱处理组的生长（CK）超过16天组，但它不再是相关拍δ ¹³C，表明有限的生长是由与光合作用相关的非气孔因素引起的。复水后第24天，干旱处理组的最终生长赶上甚至超过了CK组，并伴随着更高的干重根冠比（R / S）和根系NSC含量，这可能有利于水和新分acquisition的养分获取和紧急情况。在干旱和随后的恢复过程中，R / S和根NSC含量的变化主要归因于根酸转化酶而不是叶蔗糖磷酸合酶活性。