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Microbial polar membrane lipids in marine sediments and their significance for subsurface life

海洋沉积物中微生物极性膜脂及其对地下生命的意义

基本信息

批准号：
129028841
负责人：
Professor Dr. Kai-Uwe Hinrichs
金额：
--
依托单位：
Zentrum für Marine Umweltwissenschaften (MARUM)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2012-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/129028841?language=en
关键词：
Microbial polar membrane lipids marine

项目摘要

Intact polar membrane lipids (IPLs) are ubiquitous trace compounds in marine sediments and are considered diagnostic markers for live microbial cells. The dominance of a particular group of IPLs, glycosidic archaeal di- and tetraethers, suggests that Archaea constitute a major fraction of microbial biomass (Lipp et al., Nature 454, 991-994, 2008). A significant relationship was observed between concentrations of IPLs and total organic carbon. We suggested that this relationship captures a fundamental property of the marine sedimentary biosphere and can be used to estimate quantities of biomass. However, our current data set is still strongly biased towards sediments in eutrophic parts of the ocean. Therefore we propose to extend our environmental survey to a truly globally representative data set that includes diverse open-ocean environments and complements existing and corresponding data sets based on concentrations of bulk cells. We want to constrain the factors that control the distribution of microbial biomass in marine sediments. Additional experimental investigations will focus on the environmental persistence of the major IPL classes and study the potential existence of a fossil fraction of sedimentary IPLs. We also propose to examine the relationship between growth conditions and IPL composition in selected Archaea in order to understand the dominance of glycosidic ether lipids in marine subsurface sediments. Our research will improve our understanding of the sedimentary biosphere, its global extent and broad taxonomic composition, advance technologies for the detection of microbial biomass in complex environmental samples, and develop the career of young investigator Julius Lipp.

完整极性膜脂（ipl）是海洋沉积物中普遍存在的微量化合物，被认为是活微生物细胞的诊断标志物。糖苷古菌二醚和四醚在IPLs中占主导地位，这表明古菌构成了微生物生物量的主要部分（Lipp et al., Nature 454, 991-994, 2008）。ipl浓度与总有机碳呈显著相关。我们认为，这种关系抓住了海洋沉积生物圈的基本性质，可以用来估计生物量的数量。然而，我们目前的数据集仍然强烈偏向于海洋富营养化部分的沉积物。因此，我们建议将我们的环境调查扩展到一个真正具有全球代表性的数据集，其中包括不同的开放海洋环境，并补充现有的和相应的基于散装细胞浓度的数据集。我们想要约束控制海洋沉积物中微生物生物量分布的因素。进一步的实验研究将集中于主要IPL类的环境持久性，并研究沉积IPL化石组分的潜在存在。我们还建议在选定的古菌中研究生长条件与IPL组成之间的关系，以了解糖苷醚类脂在海洋地下沉积物中的主导地位。我们的研究将提高我们对沉积生物圈、其全球范围和广泛的分类组成的理解，推进复杂环境样品中微生物生物量的检测技术，并发展年轻研究者Julius Lipp的职业生涯。