Production of Iron-Complexing Compounds by Marine Particle-Associated Bacteria

海洋颗粒相关细菌生产铁络合化合物

• 批准号: 9633408
• 负责人: Margo Haygood
• 金额: $ 25万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 2000-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9633408&HistoricalAwards=false
• 关键词: Production; Iron; Complexing; Compounds; Marine

9633408 Haygood Iron availability is believed to have an important influence on the productivity of marine environments. The chemistry of iron in the ocean is still poorly understood, but there is an emerging consensus that iron is largely complexed by organic compounds in seawater, thus affecting the chemical behavior of iron, as well as its availability to organisms. Many bacteria, including some marine species, are known to produce siderophores, compounds which bind iron. Such siderophores may contribute to iron complexation in seawater. The investigators will study siderophore production by marine bacteria associated with particles. This study seeks to determine whether siderophores participate in iron complexation in seawater, and what environmental conditions control their production. Siderophore production by selected marine bacteria will be studied in the laboratory using biochemical, molecular, and immunological techniques. Knowledge of the factors regulating siderophore production will be useful in predicting their occurrence in the marine environment and will lead to a better understanding of iron and its influence on productivity and community structure in the ocean. This information will be immediately useful in chemical modeling of the behavior of iron in seawater. These studies will provide a key link between studies of the organic iron ligands in seawater, and the role of bacteria in influencing the availability of iron to phytoplankton and bacteria in the ocean.

9633408海古德铁的可获得性被认为对海洋环境的生产力有重要影响。海洋中铁的化学成分仍然知之甚少，但一个正在形成的共识是，海水中的铁在很大程度上被有机化合物络合，从而影响铁的化学行为，以及它对生物体的有效性。众所周知，许多细菌，包括一些海洋物种，都会产生铁载体，这是一种与铁结合的化合物。这样的铁载体可能有助于海水中铁的络合作用。研究人员将研究与颗粒相关的海洋细菌产生的铁载体。这项研究试图确定铁载体是否参与了海水中的铁络合作用，以及什么环境条件控制了它们的生产。选定的海洋细菌将利用生化、分子和免疫学技术在实验室研究铁载体的产生。了解控制铁载体产生的因素将有助于预测它们在海洋环境中的出现情况，并有助于更好地了解铁及其对海洋生产力和群落结构的影响。这些信息将立即对铁在海水中的行为进行化学模拟。这些研究将在海水中有机铁配体的研究和细菌在影响浮游植物和海洋细菌对铁的有效性方面的作用之间提供关键联系。