干旱胁迫记忆对一年生短命植物尖喙牻牛儿苗功能性状的影响

在自然界中，植物常会经历重复性的环境胁迫，如果植物前期经历的环境胁迫提高了植物在下一次胁迫出现时的耐受性，这种现象被称作胁迫记忆。胁迫记忆是植物对环境做出响应的智能性行为，常会影响植株存活、生长和繁殖等关键功能性状，对提高植物在恶劣环境中的适应性具有重要意义，但是目前关于胁迫记忆的研究多是从生理和分子水平揭示其形成机制，而从生态学视角开展胁迫记忆对植物功能性状的影响研究仍很匮乏。本研究以对干旱响应极为敏感的一年生短命植物尖喙牻牛儿苗为研究对象，在古尔班通古特沙漠腹地开展重复性干旱胁迫试验，研究干旱胁迫记忆对尖喙牻牛儿苗地下与地上功能性状的影响，分析植物功能性状之间的复杂关系及其对干旱胁迫记忆的响应差异；同时联合全基因组组蛋白和转录组分析，解析组蛋白甲基化修饰与基因表达之间的关系，初步揭示干旱胁迫记忆形成的表观遗传机制。研究结果将为短命植物在荒漠环境中的适应与进化研究积累理论资料。

In the field, plants often suffer repetitive environmental stress. If the environmental stress in the early stage improves the tolerance when the next stress occurs, this phenomenon is called as plant stress memory. Plant stress memory is an intelligent behavior of plants in response to the environmental stress, and often affects plant functional traits such as survival, growth and reproduction, which is of great significance for improving the adaptability of plants in harsh environments. However, the current research on plant stress memory mostly reveals the mechanism from the physiological and molecular levels, and there is still a lack research on the impact of plant stress memory on plant functional traits from the ecological point of view. We take the annual ephemeral Erodium oxyrhynchum that are extremely sensitive to drought as the research object in the Gurbantunggut Desert, and studying the effects of drought stress memory on plant functional traits, and analyzing the relationship between plant functional traits and their responses to the environmental stress. Simultaneously, we combine genome-wide histone with transcriptome analysis, and analyzing the relationship between histone methylation modification and gene expression, and clarifying the epigenetic mechanism of drought stress memory. The results will accumulate theoretical data for the adaptation and evolution of ephemeral plants in desert environments.