Iron-Oxidizing Bacteria in the Wetland Plant Rhizosphere: Characterization of a Novel Microbial Niche

湿地植物根际的铁氧化细菌：新型微生物生态位的表征

• 批准号: 9986981
• 负责人: James Megonigal
• 金额: $ 38.22万
• 依托单位: George Mason University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-07-01 至 2001-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9986981&HistoricalAwards=false
• 关键词: Iron; Oxidizing; Bacteria; Wetland; Plant

Megonigal- DEB-9986981Iron-Oxidizing Bacteria in the Wetland Plant Rhizosphere: Characterization of a Novel Microbial NicheWetlands are places where iron changes form a reduced form (Fe2+) to an oxidized form (Fe3+) in the presence of O2. We know this process occurs around wetland plant roots because they often have a rust-colored Fe3+ coating. Most scientists believe Fe oxidation is spontaneous and that it does not involve microorganisms. However, we discovered bacteria on wetland plant roots that oxidize Fe3+ for energy and we suspect they control Fe oxidation rates in wetland soils. We also suspect that the Fe coatings that these organisms produce are more available to Fe-reducing microbes than those in the bulk soil. We will use laboratory and field experiments to test these hypotheses. The work is important because Fe cycling affects the behavior of several other elements including some pollutants. Of particular interest is the fact that iron cycling may affect the amount of methane released from wetlands; methane is a major greenhouse gas.

湿地植物根际中的Megonigal- DEB-9986981铁氧化细菌：新型微生物Nichewetlands的表征​​是在O2存在下铁变化形成氧化形式（Fe2+）的铁变化形式（Fe2+）。 我们知道这一过程发生在湿地植物根周围，因为它们通常具有锈色的Fe3+涂层。 大多数科学家认为Fe氧化是自发的，并且不涉及微生物。 但是，我们在湿地植物根部发现了将Fe3+氧化为能量的细菌，我们怀疑它们控制了湿地土壤中的Fe氧化速率。 我们还怀疑，这些生物产生的Fe涂层比在散装土壤中更可用于减少Fe的微生物。 我们将使用实验室和现场实验来检验这些假设。 这项工作很重要，因为Fe骑行会影响其他几个元素在内的行为，包括某些污染物。 特别有趣的是，铁循环可能会影响从湿地释放的甲烷量。甲烷是主要的温室气体。