Abstract：
The increase of marine heat waves (MHWs) occurrence is exacerbated in Mediterranean Sea and temperature resilience-enhancing strategies on key species, such as the seagrass Posidonia oceanica, need to be investigated. \"Priming\" describes a stimulus that prepares an organism for an improved response to upcoming environmental changes by triggering a memory that remains during a lag-phase. The aim of this study, conducted in Sardinia (Italy), was to investigate whether the development of thermo-primed P. oceanica seedlings is affected by a field simulated MHW depending on the duration of the lag-phase. After the thermo-priming stimulus, seedlings had a 0, 7 or 14 days lag-phase and after that, for each lag-phase group, half of the seedlings experienced a simulated MHW (the other half served as controls). Some other seedlings did not experience either the priming stimulus or the lag-phase. Results did not show any evidence of a memory triggered by the priming stimulus, but they highlighted the importance of an acclimation phase before the highest temperature: seedlings that experienced a gradual increase of temperature had a higher number of leaves and shorter leaf necrosis length compared to seedlings that had a lag-phase between two heat events. Regardless the priming stimulus, MHWs slowed down the development of the leaf and root length. Considering the increase of temperature fluctuations, testing different intensities of priming and different length of lag-phase is necessary to provide information about the adaptive success of the species.
摘要：
在地中海，海洋热浪（MHW）的发生加剧了，并且对关键物种的温度恢复力增强策略加剧了。比如海草波西多尼亚，需要调查。“启动”描述了一种刺激，通过触发在滞后阶段保持的记忆，使生物体对即将到来的环境变化做出更好的反应。本研究的目的,在撒丁岛（意大利）进行，是根据滞后期的持续时间，研究热致敏的海参幼苗的发育是否受到田间模拟MHW的影响。在热启动刺激之后，幼苗有一个0、7或14天的滞后期，之后，对于每个滞后相位组，一半的幼苗经历了模拟MHW（另一半作为对照）。其他一些幼苗没有经历启动刺激或滞后阶段。结果没有显示任何由启动刺激触发的记忆的证据，但是他们强调了在最高温度之前适应阶段的重要性：与在两次热事件之间具有滞后阶段的幼苗相比，经历温度逐渐升高的幼苗的叶片数量更多，叶片坏死长度更短。不管启动刺激，MHW减慢了叶片和根长的发展。考虑到温度波动的增加，必须测试不同的启动强度和不同的滞后期长度，以提供有关物种适应性成功的信息。
