Interactive effects of solar UV-B-radiation and nutrient supply on the formation and detoxification of oxidative stress and its consequences to growth of green marine macroalgae

太阳 UV-B 辐射和营养供应对氧化应激形成和解毒的相互作用及其对绿色海洋大型藻类生长的影响

• 批准号: 175206441
• 负责人: Dr. Ralf Rautenberger
• 金额: --
• 依托单位: Botanisches Institut und Botanischer Garten
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/175206441?language=en
• 关键词: Interactive; effects; solar; UV; radiation

The eutrophication of coastal ecosystems resulting from anthropogenic land-use is an increasingly growing problem worldwide. Thus, the rapid growth of opportunistic green macroalgae is promoted, which can lead under appropriate environmental conditions to large macroalgal blooms. In contrast, disproportionately high solar ultraviolet B (UV-B) radiation in the hydrosphere, which increases locally and seasonally as a consequence of anthropogenic stratospheric ozone depletion, impairs macroalgal growth significantly. The aim of this research is to characterize the interactive effects between the two antagonistic environmental factors in spatial and temporal resolution and to elucidate the underlying physiological mechanisms. A bloom-forming green macroalga of the genus Ulva is intended to serve as a model organism. The impact of nitrogen assimilation on the formation and detoxification of reactive oxygen species (ROS) is the central subject of the investigation. The resulting implications for the growth of the macroalga can provide explanations for its survival under adverse conditions in the field. The competition between nitrogen assimilation and the Mehler reaction for electrons, which originate from the photosynthetic electron transport, is investigated in physiological laboratory studies. The potential of nitrogen assimilation in order to avoid UV-B-induced oxidative stress is the main subject of these studies. To understand these processes under natural conditions, UV-B-experiments are conducted in relation to the seasonally fluctuating nitrogen availability. Furthermore, the impact of different inorganic nitrogen histories on macroalgal oxidative stress caused by high summer UV-B-radiation is thoroughly investigated under field conditions in Ulva sp.

人为土地利用造成的沿海生态系统富营养化是世界范围内日益严重的问题。因此，促进了机会性绿色大型藻类的快速生长，这可以在适当的环境条件下导致大型大型藻类的大量繁殖。相比之下，水圈中不成比例的高太阳紫外线 B (UV-B) 辐射由于人为平流层臭氧消耗而局部和季节性增加，显着损害了大型藻类的生长。本研究的目的是在空间和时间分辨率上表征两种对立环境因素之间的相互作用，并阐明潜在的生理机制。石莼属的一种开花的绿色大型藻类旨在作为模式生物。氮同化对活性氧（ROS）的形成和解毒的影响是研究的中心主题。由此产生的对大型藻类生长的影响可以解释其在野外不利条件下的生存。在生理实验室研究中研究了氮同化和源自光合作用电子传递的电子梅勒反应之间的竞争。氮同化以避免 UV-B 诱导的氧化应激的潜力是这些研究的主要主题。为了了解自然条件下的这些过程，我们针对季节性波动的氮可用性进行了 UV-B 实验。此外，在田间条件下，对不同无机氮历史对石莼属 (Ulva sp.) 夏季高 UV-B 辐射引起的大型藻类氧化应激的影响进行了深入研究。