A species of magnetotactic deltaproteobacterium was detected at the highest abundance during an algal bloom
A species of magnetotactic deltaproteobacterium was detected at the highest abundance during an algal bloom
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在藻华期间检测到一种趋磁δ变形菌的丰度最高
DOI：
10.1093/femsle/fnz253
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发表时间：
2019
影响因子：
2.1
通讯作者：
Wu Long-Fei
中科院分区：
文献类型：
--
作者：
Pan Hongmiao;Dong Yi;Teng Zhaojie;Li Jinhua;Zhang Wenyan;Xiao Tian;Wu Long-Fei
趋磁细菌（MTB）是一类具有合成细胞内磁性晶体（磁小体）能力的微生物。它们喜欢微氧或厌氧的水生沉积物。因此，人们对它们在各种生境中的生态作用越来越感兴趣。在这项研究中，我们发现共存的一个大的杆状deltaproteobacterial趋磁细菌（暂命名为LR-1）的沉积物中的半咸水泻湖与藻类水华。电子显微镜观察显示，它们呈卵圆形至略弯曲的杆状，平均长度为6.3 ± 1.1 μm，平均宽度为4.1 ± 0.4 μm。每个细胞有一个极鞭毛。它们含有数百个子弹状的细胞内磁铁矿磁小体。系统发育分析表明，它们与Desulfamplus magnetovallimortisstrain BW-1的亲缘关系最近，属于Delta变形菌门。我们的研究结果表明，LR-1可能是MTB的一个新种。我们建议，三角洲变形菌MTB可能在铁循环中发挥重要作用，因此可能代表一个水库的铁，并在这种富营养化生态系统中监测藻类水华的指示物种。这些观察结果为培养趋磁δ变形菌和控制水华提供了新的线索，但还需要进一步的研究。
Magnetotactic bacteria (MTB) are a group of microorganisms that have the ability to synthesize intracellular magnetic crystals (magnetosomes). They prefer microaerobic or anaerobic aquatic sediments. Thus, there is growing interest in their ecological roles in various habitats. In this study we found co-occurrence of a large rod-shaped deltaproteobacterial magnetotactic bacterium (tentatively named LR-1) in the sediment of a brackish lagoon with algal bloom. Electron microscopy observations showed that they were ovoid to slightly curved rods having a mean length of 6.3 ± 1.1 μm and a mean width of 4.1 ± 0.4 μm. Each cell had a single polar flagellum. They contained hundreds of bullet-shaped intracellular magnetite magnetosomes. Phylogenetic analysis revealed that they were most closely related toDesulfamplus magnetovallimortisstrain BW-1, and belonged to the Deltaproteobacteria. Our findings indicate that LR-1 may be a new species of MTB. We propose that deltaproteobacterial MTB may play an important role in iron cycling and so may represent a reservoir of iron, and be an indicator species for monitoring algal blooms in such eutrophic ecosystems. These observations provide new clues to the cultivation of magnetotactic Deltaproteobacteria and the control of algal blooms, although further studies are needed.