Kojima Hisaya, Nakajima Takuo, Fukui Manabu
Department of Biological Sciences, Graduate School of Science, Tokyo Metropolitan University, Tokyo, Japan.
FEMS Microbiol Ecol. 2007 Jan;59(1):23-31. doi: 10.1111/j.1574-6941.2006.00201.x. Epub 2006 Sep 21.
Carbon source utilization of Thioploca species from freshwater and brackish lakes in Japan was investigated. Microautoradiography demonstrated that freshwater and brackish Thioploca samples assimilate acetate. In addition, vertical nitrate transportation by freshwater Thioploca was examined by measuring substances accumulated in Thioploca filaments. The filaments of Thioploca sp. from Lake Biwa, a Japanese mesotrophic lake, contained nitrate at concentrations higher than ambient by two to three orders of magnitude. They also accumulated high concentrations of sulfate and abundant elemental sulfur. The results suggest that the Thioploca-specific strategy for sulfur oxidation, migration with accumulated nitrate, is effective even in freshwater habitats of lower sulfide supply.
对来自日本淡水湖和咸水湖的辫硫菌属物种的碳源利用情况进行了研究。微量放射自显影显示，淡水和咸水辫硫菌样本吸收乙酸盐。此外，通过测量辫硫菌丝中积累的物质，研究了淡水辫硫菌对硝酸盐的垂直运输。来自日本中营养湖琵琶湖的辫硫菌属菌丝所含硝酸盐浓度比周围环境高两到三个数量级。它们还积累了高浓度的硫酸盐和大量的元素硫。结果表明，辫硫菌特有的硫氧化策略，即携带积累的硝酸盐迁移，即使在硫化物供应较低的淡水生境中也很有效。
