Messner Katia, Yurkov Vladimir
Department of Microbiology, University of Manitoba, Winnipeg, MB R3T 2N2, Canada.
Microorganisms. 2024 May 17;12(5):1007. doi: 10.3390/microorganisms12051007.
Marshes are an important ecosystem, acting as a biodiversity hotspot, a carbon sink and a bioremediation site, breaking down anthropogenic waste such as antibiotics, metals and fertilizers. Due to their participation in these metabolic activities and their capability to contribute to primary productivity, the microorganisms in such habitats have become of interest to investigate. Since were previously found to be abundant and the waters are well aerated and organic-rich, this study on the presence of anoxygenic phototrophic bacteria, purple non-sulfur bacteria and aerobic anoxygenic phototrophs in marshes was initiated. One sample was collected at each of the seven Manitoban sites, and anoxygenic phototrophs were cultivated and enumerated. A group of 14 strains, which represented the phylogenetic diversity of the isolates, was physiologically investigated further. Aerobic anoxygenic phototrophs and purple non-sulfur bacteria were present at each location, and they belonged to the α- and β- subphyla. Some were closely related to known heavy metal reducers () and xenobiotic decomposers ( and ). All were able to synthesize the photosynthetic complexes aerobically. This research highlights the diversity of and the potential contributions that anoxygenic phototrophs make to the essential functions taking place in wetlands.
沼泽是重要的生态系统，是生物多样性热点地区、碳汇和生物修复场所，能分解抗生素、金属和肥料等人为废弃物。由于它们参与这些代谢活动并具有促进初级生产力的能力，此类栖息地中的微生物已成为研究热点。鉴于此前发现沼泽中此类微生物数量丰富且水体含氧量高、富含有机物，本研究着手调查沼泽中无氧光合细菌、紫色非硫细菌和好氧无氧光合细菌的存在情况。在马尼托巴省的七个地点各采集了一个样本，并对无氧光合细菌进行了培养和计数。对代表分离菌株系统发育多样性的一组14个菌株进行了进一步的生理研究。每个地点均存在好氧无氧光合细菌和紫色非硫细菌，它们属于α和β亚门。有些与已知的重金属还原菌（）和外源生物分解菌（和）密切相关。所有菌株均能在有氧条件下合成光合复合体。本研究突出了无氧光合细菌的多样性以及它们对湿地重要功能的潜在贡献。
