Li Yixian, Zhao Xuyao, Xia Manli, Wei Xinzeng, Hou Hongwei
The State Key Laboratory of Freshwater Ecology and Biotechnology, The Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, Hubei, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Plant Divers. 2023 Aug 19;46(5):630-639. doi: 10.1016/j.pld.2023.08.002. eCollection 2024 Sep.
Macrophyte habitats exhibit remarkable heterogeneity, encompassing the spatial variation of abiotic and biotic components such as changes in water conditions and weather as well as anthropogenic stressors. Environmental factors are thought to be important drivers shaping the genetic and epigenetic variation of aquatic plants. However, the links among genetic diversity, epigenetic variation, and environmental variables remain largely unclear, especially for clonal aquatic plants. Here, we performed population genetic and epigenetic analyses in conjunction with habitat discrimination to elucidate the environmental factors driving intraspecies genetic and epigenetic variation in hornwort () in a subtropical lake. Environmental factors were highly correlated with the genetic and epigenetic variation of , with temperature being a key driver of the genetic variation. Lower temperature was detected to be correlated with greater genetic and epigenetic variation. Genetic and epigenetic variation were positively driven by water temperature, but were negatively affected by ambient air temperature. These findings indicate that the genetic and epigenetic variation of this clonal aquatic herb is not related to the geographic feature but is instead driven by environmental conditions, and demonstrate the effects of temperature on local genetic and epigenetic variation in aquatic systems.
大型植物栖息地表现出显著的异质性，包括非生物和生物成分的空间变化，如水条件和天气的变化以及人为压力源。环境因素被认为是塑造水生植物遗传和表观遗传变异的重要驱动因素。然而，遗传多样性、表观遗传变异和环境变量之间的联系在很大程度上仍不明确，尤其是对于克隆水生植物而言。在此，我们结合栖息地判别进行了种群遗传和表观遗传分析，以阐明驱动亚热带湖泊中金鱼藻种内遗传和表观遗传变异的环境因素。环境因素与金鱼藻的遗传和表观遗传变异高度相关，温度是遗传变异的关键驱动因素。检测到较低温度与更大的遗传和表观遗传变异相关。遗传和表观遗传变异受到水温的正向驱动，但受到环境空气温度的负面影响。这些发现表明，这种克隆水生草本植物的遗传和表观遗传变异与地理特征无关，而是由环境条件驱动的，并证明了温度对水生系统中局部遗传和表观遗传变异的影响。
