Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.2005944118 |
Bistability in oxidative stress response determines the migration behavior of phytoplankton in turbulence | |
Francesco Carrara; Anupam Sengupta; Lars Behrendt; Assaf Vardi; Roman Stocker | |
2021-02-02 | |
发表期刊 | Proceedings of the National Academy of Sciences
![]() |
出版年 | 2021 |
英文摘要 | Turbulence is an important determinant of phytoplankton physiology, often leading to cell stress and damage. Turbulence affects phytoplankton migration both by transporting cells and by triggering switches in migratory behavior, whereby vertically migrating cells can actively invert their direction of migration upon exposure to turbulent cues. However, a mechanistic link between single-cell physiology and vertical migration of phytoplankton in turbulence is currently missing. Here, by combining physiological and behavioral experiments with a mathematical model of stress accumulation and dissipation, we show that the mechanism responsible for the switch in the direction of migration in the marine raphidophyte Heterosigma akashiwo is the integration of reactive oxygen species (ROS) signaling generated by turbulent cues. Within timescales as short as tens of seconds, the emergent downward-migrating subpopulation exhibited a twofold increase in ROS, an indicator of stress, 15% lower photosynthetic efficiency, and 35% lower growth rate over multiple generations compared to the upward-migrating subpopulation. The origin of the behavioral split as a result of a bistable oxidative stress response is corroborated by the observation that exposure of cells to exogenous stressors (H2O2, UV-A radiation, or high irradiance), in lieu of turbulence, caused comparable ROS accumulation and an equivalent split into the two subpopulations. By providing a mechanistic link between the single-cell mechanics of swimming and physiology on the one side and the emergent population-scale migratory response and impact on fitness on the other, the ROS-mediated early warning response we discovered contributes to our understanding of phytoplankton community composition in future ocean conditions. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/313963 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Francesco Carrara,Anupam Sengupta,Lars Behrendt,et al. Bistability in oxidative stress response determines the migration behavior of phytoplankton in turbulence[J]. Proceedings of the National Academy of Sciences,2021. |
APA | Francesco Carrara,Anupam Sengupta,Lars Behrendt,Assaf Vardi,&Roman Stocker.(2021).Bistability in oxidative stress response determines the migration behavior of phytoplankton in turbulence.Proceedings of the National Academy of Sciences. |
MLA | Francesco Carrara,et al."Bistability in oxidative stress response determines the migration behavior of phytoplankton in turbulence".Proceedings of the National Academy of Sciences (2021). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论